|“||With great power... comes great need to take a nap. Wake me up later.||”|
Nico di Angelo is a fourteen-year-old Italian-born Greek demigod, the son of Hades and Maria di Angelo. He is also the younger brother of the late Bianca di Angelo and the paternal half-brother of Hazel Levesque. He is known in the Underworld as the "Ghost King" after taking the title from King Minos in the Battle Of The Labyrinth. He is currently in a relationship with Will Solace.
Nico di Angelo was born around 1932 on January 28th in Venice, Italy, before World War II (before Hades and his brothers took an oath to have no more demigod children). Since Nico was born in Italy and his mother was Italian (the daughter of a diplomat in Washington D.C.), he can speak fluent Italian. He had an older sister named Bianca di Angelo, who is now deceased.
As a child, Nico was obsessed with pirates. Around the age of six, Nico visited Diocletian's Palace in Split, Croatia. Nico was also obsessed with the game Mythomagic. He introduced the game to Percy Jackson in the Titan's Curse.
One of his neighbors, Pietro, had been a veteran of Mussolini's African campaign.
In The Blood of Olympus, Nico sees a brief flashback from this time - his mother smiling down at him while they both walked by the Venetian Grand Canal.
Relocation and Losing his Mother
At some point near the beginning of World War II, Nico and his family left Italy for the United States, where they stayed at a fancy hotel in Washington, D.C. Their mother, Maria, died when Zeus struck the hotel they were staying in with lightning in an attempt to kill the siblings, thinking they were too dangerous. However, they were protected by Hades as he erected an impenetrable wall of black energy to shield them from Zeus' bolts, but Hades was not able to protect their mother in time.
Afterward, a devastated Hades ordered the Fury Alecto to take Nico and Bianca to the Underworld and bathe them in the River Lethe, in order to wipe away their memories and told her to give their mom the Ancient rites.The lord of dead also swore revenge on Zeus. This later caused him to send monsters to attack and kill Thalia Grace, Zeus' daughter.
Washington D.C. and the Lotus Hotel and Casino
In The Titan's Curse, Bianca recalled that shortly after she and Nico had their memories wiped, they were returned to Washington D.C. and told by a lawyer (Alecto in disguise) that their parents were dead, and had left a bank trust for them. This "lawyer" would come by once in a while to check on both of them. During this time, Nico and Bianca were enrolled in a boarding school. Meanwhile, Bianca familiarized herself with the city's subway system. In The Blood of Olympus, Nico sees a brief flashback from this time - his sister Bianca, laughing as she pulled him across the National Mall. After some time had passed, Hades, hoping that one of his children might one day become the "child of the Eldest Gods" (referred to in the Great Prophecy), decided to place them in the Lotus Hotel and Casino, and tasked Alecto with the job. Once again disguised as a lawyer, Alecto had Nico and Bianca leave the boarding school, and took them all the way to the Lotus Hotel, in Las Vegas.
After what the siblings thought was a month in the Lotus Hotel (which turned out to be 70 years), they were taken out by Alecto, this time disguised as a different lawyer. Alecto drove Nico and Bianca back east, through D.C., and then up into Maine. They were brought to a military school called Westover Hall, paid for by Hades using what Nico and Bianca thought to be a trust fund left to them by their parents. At this point, Nico became obsessed with Mythomagic, a card game. It was later revealed that Nico had been obsessed with pirates even before he started collecting Mythomagic cards. Bianca mentioned that the summer before she left Westover Hall (during the events of The Sea of Monsters), she and Nico visited Washington D.C. once again, and were very surprised to see several subway stations that had not been there before. In The Titan's Curse, Bianca mentions that during their visit, several monsters (disguised as mortals) attempted to attack them in an alley. Nico also mentions seeing a bus driver (most likely a satyr in disguise) with ram's horns, though Bianca had not believed him at the time.
Nico and his sister, Bianca di Angelo, appear at a school dance at Westover Hall, a boarding school in Bar Harbor, Maine. Grover explained to Percy, Annabeth, and Thalia that he’d discovered them at school but every time he tries going near them, Dr.Thorn keeps blocking him. They saw them arguing on the bleachers, with Nico playing with Mythomagic cards. Bianca and Nico were later taken by Dr. Thorn, scared of Percy. Dr. Thorn tried to kidnap them and Nico stood up for Bianca when Dr. Thorn called her an “insufferable girl”. Percy tried defending the siblings and Thalia and Annabeth later jumped in to defend them. Nico got excited when he found out Dr. Thorn was a manticore, saying he had 3,000 attack powers and 5 saving throws.
After they were saved, Percy told Nico and Bianca that they were demigods, and Nico thought it was cool, and immediately asked questions about Zeus. Nico also complimented Percy about how he attacked the manticore. Nico was also excited after he heard about Camp Half-Blood and immediately wanted to go. While Artemis spoke to Bianca, Nico went to talk to Grover in the woods about “geeky stuff”. When they came back, Nico exclaimed that Percy’s arm was green while Grover healed it. Nico also showed Percy his collection of Mythomagic cards and figurines, and asked to see his sword. Nico immediately asked Percy a lot of questions, annoying him, including if asking if Annabeth was his girlfriend. Percy almost lost his cool until Zoë Nightshade asked to see Percy.
Bianca talked to Nico explaining her decision to join the Hunters of Artemis, making Nico upset and gloomy. However, Nico was impressed with Apollo and said he had a cool car. When they got in the bus, Bianca left Nico to sit in the front of the bus with Percy, Thalia, Grover, and Apollo. Nico asked Apollo a lot of questions about the gods and the sun, making Apollo laugh and ruffle Nico’s hair and answer them, not making sense to Nico. Nico asked if he could drive the car, but Apollo said he was too young.
When they arrived to Camp, Nico asked Percy about the lava climbing wall. Bianca whispered something in Nico’s ear, but he scowled and looked away, making Percy wonder what Bianca told him. He also asked who Chiron was, and said he didn’t have his figurine. Percy explained it to him, and Nico said if the Hunters didn’t like him, it was good enough for him. Percy introduced Nico to Chiron and Dionysus, and was taken by Grover to see the orientation film, after asking what rating it was, since Bianca was strict. Later, Nico was impressed when finding out that Chiron was a centaur. Nico was also impressed by Dionysus and called him “the wine dude”, after saying he had his figurine in Mythomagic, and talked to him about the defense points all the gods had in the game.
At dinner, Nico sat with Connor and Travis Stoll at the Hermes cabin table, telling him poker was a better game than Mythomagic. The next day, Nico played Capture the Flag on a team with Percy, the Stoll Brothers, Charles Beckendorf, Silena Beauregard, and some others. Nico ran up to Percy before the game started telling him the game was awesome, with a helmet too big for him. Nico asked if he could kill the other team, but Percy told him it was serious and that swords could hurt. Nico took guard duty with the Stolls and Beckendorf, and cheered when Percy crossed the boundary line.
The next day, Percy found Nico spying on Bianca and Zoë arguing about what happened to Phoebe in the early morning. Nico later saw Percy after he removed the invisibility cap, and thought it was cool. Nico told Percy he didn’t sleep too well and wanted to follow Bianca on to the quest, but Percy said he couldn’t because she could die, making Nico say Percy could go for him. Nico and Percy argued until Nico asked if he was planning to go anyway, and Percy said yes. Nico said he wouldn’t tell on him, but he had to promise he had to keep Bianca safe. Percy promised, and Nico said he would make an excuse up to Chiron, and told him to go.
A few days later, Nico ran to find Percy in the Big House and asked where Bianca was. Percy told Nico the news, and gave Nico the figurine she wanted him to have. Nico said that he promised to protect her, and though Percy tried to explain, but Nico said that he promised. Nico said he shouldn’t of trusted Percy and explained his nightmares and said he hated him, throwing the statue. Nico said he could feel Bianca being judged in the Fields of Asphodel, but skeletons interrupted them. Nico opened a crack in the floor of the cabin, making the skeletons disappear. Nico told Percy that he hated him and wished he was dead, and ran away. Percy realized he was a son of Hades and told Grover and Annabeth, but not Chiron.
Another reason Nico ran away was for love. He had a crush on Percy and couldn’t deal with the feelings towards him, and ran away. Homosexuality was illegal in the 1940s, so he felt great shame for his feelings. He couldn’t imagine a man he trusted hurting him, and was angry at him for what happened to Bianca, but his feelings for his hero complicated that.
Between the books
Nico eventually found the entrance to the Labyrinth and found Minos. Minos manipulated Nico and the two travelled together, with Nico barely eating at all. Nick became very depressed during this time and his anger only grew bigger, and he became convinced that he would never belong at Camp Half-Blood because he was a son of Hades. He even abandoned his Mythomagic cards. Nico became very strong during his months away, and he became very strong, learning to summon ghosts. He also got his Stygian iron sword. Nico also learned how to shadow travel but ended up in China many times. Nico and Minos would camp out in the Underworld where Minos would try to manipulate him into doing a soul for a soul to bring Bianca back.
Nico’s appearance also changed. His hair grew to his shoulders and his skin went from olive to as white as snow. He also donned his signature outfit of his aviators jacket, black jeans, and a skull shirt, with a sword on his side. He became very skinny and bony due to his meager diet.
While Nico was gone, Percy, Grover, and Annabeth searched for him the entire spring with no luck. Percy thought about Nico a lot and the crack he made was still in his cabin.
Nico is first seen through the Iris message that Bianca sent to Percy. Frustrated, he seeks to make a deal with his father by trading "a soul for a soul." Percy thinks that Nico is after him, but Nico is actually after somebody else
Nico decides to find the soul of someone who cheated death and trades it for Bianca's, along the way, he summons the soul of Theseus for advice with MacDonalds. Later, Nico unexpectedly meets Percy, Annabeth, Tyson, and Grover at the Triple G Ranch. He'd entered the ranch to discuss finding the soul he needed with Geryon. Angered, he threatens them but is stopped by Geryon. Nico still blames Percy for Bianca's death and tells him so. He is then tied up by Geryon to be sold to the Titan Army. When Percy offers a deal to Geryon to save him, Nico shouts that he does not want to be saved by Percy. Nonetheless, Percy still saves Nico, killing Geryon with the help of Hera and convinces him to try and summon Bianca's spirit again. It works, however, Bianca tells Nico not to be angry at Percy or hold grudges against anyone because that is the fatal flaw of the children of Hades. She says to stop blaming Percy because it is really she that Nico is angry at for abandoning him. She also gives a warning about Kronos sensing Nico, and then she disappears. He stays at the Triple G Ranch while the others leave.
Nico is tricked by Minos into going back into the maze to save Percy but is captured by two dracanae in Kronos' army. In the battle at Daedalus' Workshop, Nico opens a fissure in the ground, sending Minos back to the underworld. He tells Percy that only the dead accept him, and they only do so out of fear.He escapes with Percy, Annabeth, and Rachel Elizabeth Dare, who have to go back into the Labyrinth to find Grover and Tyson who are lost in the labyrinth. Along the way, they see Kronos (in the form of Luke Castellan), and Nico, in a desperate attempt to save everyone, shows his true powers, by conjuring a wall of black stone that stops Kronos from following them back into the Labyrinth but also makes it known to Kronos that he is a son of Hades. When they find Grover and Tyson, they also find the long-lost god Pan, and Nico notices that he is the only one that Pan doesn't talk to.
During the battle at Camp Half-Blood, Nico summons many undead warriors to fight and manages to stop some rogue dracanae from reaching the cabins of the gods. The effort nearly kills him and he collapses on the ground, exhausted, his clothes smoking, at the end of the battle. Percy finds him and helps him by giving him nectar. He releases Daedalus' soul after that, who offers his soul for ransom, but Nico decides Bianca should stay where she is. He feels out of place at Camp Half-Blood and refuses to eat with the other demigods or join the singalong at the campfire. Nico summons Bianca's spirit one last time to say goodbye. He tells Percy that he will leave Camp Half-Blood because he feels that he doesn't belong there just like his father doesn't belong on Olympus. Before he leaves, Percy gives him the small Hades statue that Bianca had given him before she died.
He appears again at the very end on Percy's birthday at his apartment, and offers a way to defeat Kronos, but is distracted by Percy's blue birthday cake. Percy offers him some, and they both go inside to talk about Nico's secret plan to beat Kronos.
Nico is one of the three demigods along with Thalia and Percy who are summoned by his step-mother Persephone to find the Sword of Hades. Naturally, Nico didn't take well to her welcome since she turned him into a dandelion when they last met. Percy thinks it's a bad idea but Nico is hoping to achieve recognition from his father Hades. He tells Thalia and Percy why they need to go on the quest. To Percy's irritation, he comes up with logical reasons. His knowledge of the Underworld and its occupants helps them complete their quest. He remains in the Underworld afterward to discuss the upcoming Titan War with his father. Before his friends leave, he reminds Percy of his idea to defeat the Titans.
Nico's theory to gain an edge over the Titans is finally revealed: it is to make Percy invincible by having him bathe in the River Styx, similar to the myth of Achilles. It is later revealed that Nico had hoped that this would also make Percy fall in love with him. It is shown that after Bianca died, Hades believes that he has no competent child, repeatedly mentioning that Bianca could do a better job at fulfilling their father's demands. At some point earlier, Nico began preparing for his plan, and did some research on Luke's past, and had found May Castellan, his mother.
Later on, Nico is once more searching for information about his mother and childhood, a quest that brought him to Mount Othrys/ Olympus. Nico is first seen there in Percy's dream, using a chance to eavesdrop on the Titans Hyperion and Krios, as well as the imprisoned Atlas. It is later confirmed that this was true. Shortly after Beckendorf sacrifices his life to destroy Kronos's ship so that Percy could escape and the enemy ship could be destroyed, Nico speaks to his ghost and learns that Beckendorf will go to Elysium. Nico himself also heard the lines of the Great Prophecy, presumably from another ghost, or Hades himself.
Later on, Nico arrives at Camp Half-Blood by shadow-travel, which initially terrifies Juniper and Leneus, and he briefly discusses Grover's disappearance with them, after which he encounters Percy. Nico is finally able to persuade him to go through with their plan, and both of them and Mrs. O'Leary shadow-travel to Luke's old house to meet his mother, May Castellan. Afterward, they briefly encounter the goddess Hestia, who greets them warmly and offers them food.
Soon after, the three enter the Underworld, where Nico, who was tricking Percy all along, had the Furies carry them to Hades' Palace. It is revealed, that in order to gain information about his past and his mother, Nico had to bring Percy to Hades in exchange, and though Nico had no ill intentions, and only did it after making Hades promise not to harm his friend. His father reveals that the lawyer who removed Nico and Bianca from the Lotus Hotel and Casino was the Fury, Alecto, in disguise, but refuses to give him details on his mother's death. After Hades still imprisons Percy in his dungeons, Nico helps him break out, apologizes, and still follows through with his initial plan of having Percy bathe in the Styx and gain the Curse of Achilles. After Percy bathes in the Styx and got the Curse of Achilles, he was able to defeat Hades and his entire army of the dead.
Later, Nico attempts to summon the ghost of his mother, but Bianca's ghost appears and tells him not to. He sees the scene of their mother's death in which Zeus blasted the hotel she, Hades, and the children were in into pieces. Hades, who realized what was happening too late, only managed to save Nico and Bianca. He then orders Alecto to wipe the memories of the children in the Lethe, including their mother's death.
By viewing this scene, Nico finds out who his mother is and, in the end, is able to convince his father Hades to help the campers in the battle against the titans.
Nico is the first to join the Battle of Manhattan, and fearlessly yells out a challenge to Kronos himself. Nico is soon joined by Hades himself, and they both summon wave after wave of the undead soldiers, who confront and eventually overwhelm Kronos' forces. After the Titan Lord is defeated by Percy and Luke, who sacrifices himself, Nico accompanies his father to Olympus and sits at his father's feet when Percy and his friends are receiving gifts from the Olympians. Apparently, Nico, through his unwavering loyalty and bravery in battle, has finally gained his father's pride, as Hades even pats Nico on the shoulder, and, according to Percy, this is "the happiest he's ever seen him." Since Hades is now accepted on Olympus, and Nico is accepted at Camp Half-Blood, Rachel is finally able to break Hades' curse on the Oracle and become the next Oracle of Delphi herself. Apparently, almost all campers are in awe of Nico's fighting in the Battle of Manhattan, as "even the Ares kids considered him cool." Nico is last seen when he orders undead workers to build the Hades cabin, made up of solid black obsidian walls with a skull over the door. There are torches inside that blaze with burning green fire that will never extinguish.
Between the Series
Sadly, Nico's popularity only lasted a few weeks. After that campers did whatever they could to avoid him and forgot he was at camp. (Though a year or so later Will Solace tells him this never happened, he in fact isolated himself). The fact that Percy had begun dating Annabeth did not make Nico feel any better. As a result, Nico takes to only showing up at Camp from time to time. Sometime after the Battle of Manhattan, Hades gave Nico a French zombie chauffeur, Jules-Albert, for his birthday.
As revealed in The Son of Neptune, in the September following the Battle of Manhattan, after Thanatos had been captured, and the dead were returning to the world anyway, Nico had gone to the Underworld in hopes of rescuing his sister Bianca, but was unable to do so, because she decided to be reborn and thus couldn't be brought back to life.
Instead, Nico found his half-sister Hazel Levesque in the Fields of Asphodel and felt that she deserved another chance at being a hero (Gaea said that he had selfish reasons for doing this, but it is unknown if he had any or for what selfish reasons did he do it for). Hades gives Nico directions on how to find Camp Jupiter, explains why the Olympians have kept both camps separated for centuries, and forbids him from telling anybody about it, as the time isn't right. Hades also advises his son to introduce himself to the Romans as a son of Pluto, telling Nico that it is important for him to make this connection.
As stated by Dakota, Nico took Hazel directly to Camp Jupiter and requested that Reyna and Jason take her in. Thus, Nico became the first Greek demigod since the First Demigod Civil War to learn about the existence of Roman demigods and to visit Camp Jupiter. He accepts a role as the Ambassador of Pluto to the Romans and becomes involved in the camp's political life as a Senator.
Annabeth mentions that Nico is searching for Percy along with Tyson, Grover, and the Hunters of Artemis, but otherwise, he doesn't appear in this book. It's to be assumed that he doesn't stay at Camp Half-Blood much, as Annabeth said he "sometimes" shows up, which could be due to his double duty at Camp Jupiter as Ambassador of Pluto. She mentions him as one of the only children of the big three along with Percy Jackson and Thalia Grace. Unknowingly to her, Jason Grace is also a child of the big three, being the son of Jupiter and Hazel, the daughter of Pluto.
Nico meets Percy at Camp Jupiter, where he is visiting his half-sister, Hazel Levesque. Nico is very shocked when he sees Percy, but he introduced himself and held out his hand. They shook hands, and Percy said that he knew him, but Nico said, “Do you?”, not telling him about his past. Hazel tells Nico about how Percy arrived and Nico tells Percy about Gaea, and how evil she was. He also tells him about how. Saturn came back and caused the Second Titan War, and the Battle of Mount Othrys. Nico mentions how he told Reyna Ramírez-Arellano about the giants being reborn, but she didn’t listen to him. Nico also greeted Frank Zhang when he arrived and smiled, since he was amused by him and was never uneasy around him. Nico tells Frank to take Percy to dinner while he talks to Hazel, and tells Hazel that he is staying over night. Hazel is stressed about this, because she knows that the campers won’t like that.
Hazel and Nico talked on the roof of Pluto's Shrine, where Nico tells Hazel that important things are at work, and he cannot tell Hazel much about Percy, but she can trust him because he is only dangerous to his enemies. Hazel was still suspicious, and Nico got moody, making bones pop up from the ground. Nico reassured Hazel that she can make things right, and almost calls her Bianca, making Hazel even more bitter, knowing that she will never be like her. Nico tells Hazel how “Pluto” was going crazy because of everything happening in the Underworld, and that Hazel belonged at Camp Jupiter. After Hazel blacks out, Nico gets very worried and asks her where she was when she woke up. Nico warns Hazel that she should better control her blackouts.
Hazel and Nico ran to the mess hall for dinner and Nico gave her Nectar to heal her cuts after she fell, when a gold bar popped up. The two ran for the gates of Camp to not be late for roll call. When they arrived, Nico went next to Percy. After Hazel stood for Percy, Nico was proud of her and beamed at her, calling her “sis”. Hazel wondered if he called Bianca that. While Frank was with Percy, Percy asked many questions about Nico, which Frank didn’t know much of the answers. Frank thinks that he isn’t like Hazel since Hazel is nicer and better looking, and tells Percy that he is mysterious and makes everyone nervous, but not him.
At dinner, Nico sat with Frank, Percy, Hazel, and the Centurion Dakota. Percy wanted to talk to Nico about if he saw him before, and Nico panicked and told him unless he saw him in the Underworld, they never saw each other. Dakota says how Reyna never knows what to do when Nico arrives, which Nico took no offense to. Nico says that Dakota was helpful, standing for Hazel, making Dakota blush. Nico tells Percy that he only learned about Hazel recently, how children of Pluto stick together, and how he had another sister. When Don started mentioning Percy’s empathy link, Nico had Frank and Hazel get Percy oriented and dragged Dakota, Don, and Vitellius to the Praetor’s table to discuss war strategies, dragging Don and Vitellius by the ear.
During the war games, Nico watched from the observation tower in the fort with binoculars. After Gwendolyn died and came back to life, Reyna asked Nico if it was a power of Pluto, but Nico says that no one returns from the dead, and glanced at Hazel, telling her to stay quiet. When Mars arrived at Camp, he glared at Nico while talking about how some people return from the dead. The next day, Nico participated in the Senate meeting and wore a black toga, sitting with the other senators. Nico tells Reyna that he and Hazel learned about the giants from Pluto, and how the eldest giant, Alcyoneus, was born to oppose Pluto. Reyna was suspicious, and told him that he sounded “quite familiar with him”. Nico tells the others how only a demigod and a god together can kill a giant, and how it has happened before in the First Giant War. Nico also explains to Percy how Pluto is the god of the dead, but Thanatos is the god of death, but he was captured. Nico also says how it is easier for ghosts to escape your underworld, and how Gaea and her forces captured the Doors of Death, making monsters escape.
Before Hazel left, Nico wished her luck and said that he would head back to your Underworld to help his father with helping the Furies. Nico also planned to track escaping souls and find the Doors of Death. Hazel told him to be careful, but Nico said that he knew how to hide. Nico was also worried that after she saved Thanatos, he would never see her again, and she would go back to the dead. Nico said goodbye and melted into the shadows. Nico is later shown in one of Hazel's flashback blackouts. He finds Hazel in the Fields of Asphodel and brings her back to the mortal world to give her another chance at life. Hazel later learns that he is in Rome. Percy becomes angry at him when he regains his memories.
Journey through Tartarus and Europe
During the events of The Son of Neptune, Nico was looking for the Doors of Death and thought he could go anywhere in the Underworld, but was sucked into Tartarus while looking for the doors. Nico had to drink liquid fire from the River River Phlegethon, which pained him very much. Nico saw Tartarus without the veil of the mist like Percy and Annabeth did, and saw it how it really was: the body of a god. When Percy briefly saw it like that when he experienced the place, he realized that was how Nico saw it and thought that if he almost went insane by seeing it for just a second, he couldn’t imagine how Nico felt.
Nico almost went insane from the sheer amount of Gaea’s forces, but managed to get very far into Tartarus and met Akhlys, the goddess of misery. However, instead of trying to torture him, she complimented him in the sheer level of misery he had inside him and how he was perfect: she couldn’t add any more misery to him.
Eventually, Nico was captured by Otis and Ephialtes, who took him through the Doors and dragged him through the House of Hades, where they took him to Rome in the Colliseum and put him in a bronze jar and guarded it, where he would die on the Kalends of July. They used him as a trap to bait Percy and his friends. Nico lost a lot of weight and ate pomegranate seeds, going into a death trance. Nico almost gave up hope while in the jar.
Percy sees him in his dream, imprisoned in the jar in a coma-like state. He had marked three scratches on the wall of the jar, one for each pomegranate seed he had eaten. The seeds are a last resort food, which only children of Hades/Pluto can eat. Hazel explains that the seeds last for up to one day and put him in a death-like state so that he doesn't use up all his air, something Hazel calls a death trance.
Despite knowing that it's a trap, the Seven head to Rome to rescue Nico. After getting there, Hazel, Frank, and Leo try to find Nico, which leads them to the Pantheon, but they are led into a trap and are almost killed by eidolons. After defeating them, Leo realizes that Hazel was trying to track Nico by using his sword as a beacon, which they find lying in the workshop.
Instead, Percy, Jason, and Piper come to Nico's rescue underneath the Colosseum. During Percy and Jason's battle against Otis and Ephialtes, the jar Nico was held in breaks open and Piper McLean manages to pull the incredibly weakened Nico to safety. Later back on the ship, Nico tells them how he was captured and what he now knows about the Doors of Death. Nico had found out that the Doors of Death have two sides: one in the mortal world and one in Tartarus. The mortal side of the portal is in Greece, at a temple called House of Hades and it is guarded heavily by Gaea's forces. Nico then says that the other side of the doors is in Tartarus, a place not even the gods go and that is why Hades has not been able to close the doors. Not even the god of death, Thanatos, would go near Tartarus.
Leo guesses that the seven heroes will have to go to Tartarus and close that side of the portal, but Nico says that it would be impossible, not even they would stand a chance down there because of the strength and the sheer number of monsters there. Percy then says that they can set sail for the House of Hades, defeat Gaea's forces, and close the doors on the mortal side. Nico, however, says that it is not that easy and that the Doors of Death have to be controlled on both sides to be closed, as they are like a double seal. He says that maybe all eight of them working together could defeat Gaea's forces on the mortal side, but that they would need a team fighting simultaneously on the Tartarus side; a team powerful enough to defeat a legion of monsters in their home territory.
In Arachne's lair, when Percy tries to save Annabeth from falling into Tartarus, Percy catches hold of a ledge just in time. Nico tries to help, but he is out of reach. Annabeth tells Percy to let go, but Percy says that he will not lose her again. Percy tells Nico that they will see the rest of the seven and Nico on the other side, and makes him promise to lead the others there. Nico promises and Percy lets go, allowing the dark gravity of Tartarus to pull him and Annabeth in. During a meeting on the Argo II, Nico admits that Percy is the most powerful demigod he has ever met and with Annabeth there with him, he is sure they will be safe and make it out on the other side. He assures Leo that both Percy and Annabeth are still alive.
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The Argo II is being attacked by numina montanums, or mountain gods, who are attacking with boulders. As they attack, a boulder hits the mast, causing it to collapse, and Nico, who was in the rigging, falls with it. Hazel Levesque runs to help Nico up from the debris, but he tells her he is fine. When Leo complains that masts don't grow on trees, Nico corrects him by saying that masts are made from trees, which only serves to annoy Leo further. Leo is forced to retreat again and the three try to think of an alternate way past the Earth gods.
Nico explains that they don't like them because children of Hades/Pluto get under their skin but adds that the Athena Parthenos was most likely attracting more attention. When it is suggested that they take the Argo II around the mountains over the water, Nico explains that going that way is longer and without their sea expert, Percy, it might be too dangerous. Nico also complains that he is too weak to simply Shadow Travel the ship across the mountains. While coming up with ideas, Hazel tries to think of a way to help, not wanting her only contribution to be removing a dangerous obstacle Nico had told her was in the House of Hades. When Hazel prays to her father for help, Arion appears, running towards them. Nico asks who Arion is and is told by Leo that he is Hazel's horse.
When Hazel comes back, Leo and Nico help her to her feet when she falls down. Nico asks her what she saw from Hecate, but Hazel refuses to tell him any information and tells him to get some rest.
On July 5th, Nico meets Jason, Leo, Frank, and Hazel for breakfast on the ship. Nico sat at the back of the table with his sword by his side, creeping Leo out. Nico tells the group how he met with a former priest of Hecate the night before, and he learned about things they need to do to go through the House of Hades, and the history behind the place. Leo made jokes about it but Jason told him to stop. While talking, the ship lurched and Nico fell against the wall, banging his head. Hazel rushed to help him, while Leo ran to help Piper and Gleeson Hedge.
The ship soon arrived in Venice, and Nico sat in the harbor with everyone else and surprised Frank by revealing he knows Italian. Nico volunteers to go with Frank to find The Black House and Hazel goes with, relieving a creeped out Frank. The three walk through Venice, while Nico led them to the house, and Nico mentioned that Venice was filled with Lemures, and that his mother told him about it. Nico told the two that Hades met his mother in Venice in the 1930s and they had him and Bianca, but he doesn’t remember much about Italy. Hazel and Nico were later attacked by monsters, and Hazel was poisoned, and Nico couldn’t stop it.
Nico screamed for Frank and told him what had happened, making Frank wanting to kill the son of Hades. Nico told Frank to get back to the ship with Hazel, but a man leads them into The Black House. Nico finally remembers that the monsters were Katobleps, and said he knew them from Mythomagic. Frank tells Nico that he played that game but didn’t have the card, and Nico says it was from the Africanus Extreme expansion deck. Nico begs the man to cure Hazel, but he refuses when he finds out that she is a child of Pluto. Nico begs more and is turned into a corn plant. Nico is later turned back to normal by him after Frank fixes his chariot, and Nico mentions having a strange nightmare about popcorn. Nico calls Frank brave for killing the monsters and is in shock when he realized he killed all of them but tried breaking the tension between Hazel and Frank by asking what barley looked like.
After Nico was turned into a plant, Nico became more reclusive than usual and spent most of his time on the masts, away from the rest of the crew. Nico later discussed with the crew what to do about Sciron.
The Argo II arrived at Croatia to fetch Diocletian's Scepter, Jason wanted to go there to find Reyna. Nico mentioned the legend about the scepter and told Jason that he would need his help if he wanted to find it. Jason was creeped out by Nico but reluctantly decided to go with him. They arrived at Split, and Jason picked up Nico and flew him to find how to get to Dalmatia, causing Nico to freak out about being touched. Nico mentioned how he visited Croatia when he was six, and being stuck in Lotus Hotel and Casino helped him transition easier since time passed in a weird way. They went underground and met Favonius, who told Nico that he was watching him since he was a little boy, and said why he wouldn’t allow the truth, with the person he cared about most in Tartarus. Jason thought it was Annabeth, and told him admitting his crush would be embarrassing, but it’s for the scepter. In reality, Nico felt sick because he had to admit his crush on Percy.
Favonius turned them into the wind and took them to Dalmatia, and told Nico if he let anger rule him with Cupid, his fate will be sadder than his. Nico stood by Jason when Cupid arrived, and for once, Jason was glad to have Nico there. Jason was pushed down the stairs, but Nico ran to help him up. Nico begged for the scepter and eventually told him that he wants to pick on him, not Jason and that he doesn’t scare him. Cupid taunted Nico, and told him to tell Jason why he left Camp Half-Blood, and why he is always alone, afraid of himself and his feelings. Nico screamed, causing skeletons to come from the ground and memories of his life being seen to Jason. Nico kept being taunted until nearly reduced to tears, and admitted that he had a crush on Percy. Cupid gave him the scepter and left. Jason told him that he won’t tell the others and that he was brave. The two went back to the ship. After that experience, Nico hid even more from everyone, looking to Jason, Piper, and Leo as if expecting an attack from them. Piper knew something big happened in Croatia, but Jason wouldn’t tell her. Nico went to but the scepter below deck, because the scepter was making the sea and weather weird.
Later Nico confronts Jason about leaving the palace of the Lord of the South Wind. Jason attempts to talk to Nico about what happened previously, saying that the others won't judge him. Nico becomes angry and claims that as a son of Hades he would never be accepted anywhere and always judged. In his anger, the ground opens up and Nico seems to shimmer with ghostly light. Jason then challenges him by saying that he should take a risk and believe that Jason really is his friend. As the scene reaches a climax, Nico tells Jason, "I'm going to honor my promise. I'll take you to Epirus. I'll help you close the Doors of Death. Then that's it. I'm leaving- forever." The son of Hades then disappears back into the shadows. Jason has stated multiple times that Nico di Angelo scares him when he gets angry. Nico later went with everyone to Malta, where he met with Leo and shook his hand, happy to see him, and looked suspiciously at the people walking down the street.
Nico kept raising the dead and legionnaires with the scepter. When the battle ended, Nico calmly told Frank that he had an arrow in his arm. Nico, Jason, Piper, and Frank went to find Hazel and Leo and arrived with their swords drawn, and Nico used his sword to absorb the darkness. When the battle ended, Nico went to Hazel and kissed her, and Hazel cupped Nico’s face, realizing that he had been crying. Nico had everyone hold hands and shadow travel away, with the help of Hazel, and Nico held Percy’s hand longer then everyone else did, making him immediately pull away. Hazel thought it was because he went through Tartarus alone.
Nico and the others ate dinner with Reyna, and Nico decided to go with Reyna and Hedge to bring the Athena Parthenos back to Camp Half-Blood and went to get ready. Nico ties the statue up with rope to be able to it and Percy comes to thank him for keeping his promise. Nico cuts him off and tells him to give him space. He then shadow travels away with Reyna and Coach Hedge.
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Nico shadow traveled with Reyna and Hedge to Albania and something humiliating occurred. Two days later, he shadow travels himself, Reyna and Hedge into the air above Mount Vesuvius, and they nearly fall in, but Reyna lends him enough strength to shadow travel down into the city of Pompeii, after which he sleeps for about a day. When he finally wakes up just after sunset, he wolfs down a sandwich and talks with Hedge and Reyna about Reyna's dreams. He mentions that he thinks he could make it to Spain when Gaea possesses Hedge and sent dirt-encrusted ghosts of Pompeii to attack them. Reyna tells him to summon dead legionnaires to their aid with Diocletian's scepter, and he does so, but the scepter starts smoking and then explodes in his hands. He straps himself into the harness on the Athena Parthenos, carrying Hedge, while Reyna holds the ghosts off and shadow travels away just moments after Reyna grabs his hand.
Nico passes out after shadow traveling. While he is out, he dreams about his life in Venice, Bianca, and him in a mall in Washington, D.C., and Percy shielding him from Dr. Thorn. He is pulled to Hypnos' Cabin by the dreams of Clovis, who shows him that day's war meeting at Camp Half-Blood, which shows that the Greeks are cornered in by the Romans and preparing for the invasion. After telling Clovis to pass a message on to Thalia Grace, he is woken by Coach Hedge thirty-six hours after passing out. Hedge informs him that they overshot Spain and went to Portugal instead and that the Athena Parthenos was on top of a temple. Hedge then tells him a ghost is asking to talk to him. Nico goes to the ghost, who leads him to a church that is decorated on the inside with the bones of deceased monks. There he meets his father, who tells Nico that his quest is hard and he might not survive the trip. He also tells him that Orion and his pack is hunting Nico, Reyna, and Hedge and that one of the seven will die. Before Nico can ask more questions, Hades vanishes. He goes back to the temple and has lunch with his companions. Suddenly Lycaon and his pack surround them. He informs them that he is going to kill them for Orion; however, Orion wanted him to detain Nico. Nico summons bones from the ground to imprison the wolves momentarily while the three ran towards the Athena Parthenos. When the werewolf breaks free and attacks Nico, Nico stabs him in the chest with Reyna's silver knife, getting clawed in the process, and uses the shadow left by Lycaon to shadow travel away.
After Portugal, Nico shadow travels to a cruise ship in the middle of the Atlantic for a day, where he discarded his aviator's jacket due to the damage it took, and Reyna patched up his gashes. He then travels to San Juan, Puerto Rico, ten feet above a restaurant. After he goes to sleep, Reyna puts her backpack under his head. However, her hand passes through his head on her first attempt and lifts it the second. When Nico awakes to find Reyna gone and a note from the hunters, he tore the note up in a fit of rage. Later he and Hedge put on new colorful tourist shirts -much to his annoyance- before joining the fight against Orion. Once the two meet up with Reyna and Thalia, Nico, Reyna, and Hedge retreat to continue their quest.
Two days later, the trio shadow travels to Buford, South Carolina. While Nico and Hedge go to the Zippy mart for supplies, Reyna stays behind to watch over camp. When the boys come back to base camp, Hedge goes to write letters while Nico and Reyna talk. She tells him about her father and family history. In return, Nico told her about his relationship with his father, and that cheered her up a little. Just then Bryce Lawrence shows up and summons British redcoat skeletons to apprehend Reyna and kill Nico and Hedge. He threatens to torture Hedge to death and taunts Reyna about her secret about her father. This infuriates Nico, whose temper explodes. He proceeds to unleash all his painful memories since falling into Tartarus on the others at the camp, revealing his secret in the process. As the temperature drops to freezing and the skeletons dissolve, Nico marches over to Bryce and opens a fissure beneath the other boy's feet, and as Bryce sinks into the ground, Nico turns him, body and all, into a ghost and sends him to the Underworld. After that he collapses, nearly fading away because of overuse of his powers, and wakes up with Hedge and Reyna bandaging him. They had managed to save him through Hedge's sports medicine and nature magic. They tell him what happened with Bryce, and to his shock, they tell him that they still trust him. Moments later, a flock of Pegasi arrives to help them take the Athena Parthenos to Camp Half-Blood, led by Pegasus himself.
The flock flies Nico and his companions to Camp Half-Blood by the pre-dawn of August first. They land on a yacht, and Nico sends "some strong dreams" to the mortals below deck, much to Reyna's awe. Soon after, Michael Kahale, Leila from the Fourth Cohort, and Dakota from the Fifth Cohort come to arrest Reyna and bring in Nico to be executed as an enemy spy. Hedge attacks the son of Venus to little success, but then the people on the boat hear the voice of Octavian, saying he had come to see to the arrests himself. Seconds later Tyson, who presumably had imitated Octavian's voice, and Ella knock out the first cohort centurions. The other two centurions decide to help Reyna and declare their loyalty to her. They tell Reyna what their base camp is like, and she sends them to get their cohorts to leave Octavian and Nico to sabotage the legion.
After they arrive at a private dock and haul Michael Kahale out of the boat, they wonder who will drive the SUV, and Nico volunteers, much to their shock and nerves. He then summons Jules-Albert to drive the SUV through Roman ranks. When they arrive they see that the legion is outnumbered by monsters. Dakota and Leila get out to get their cohorts to switch sides, while Nico goes to sabotage the siege weapons. When he gets to the top of the hill, he is startled by Will Solace, Lou Ellen, and Cecil, who are trying to sabotage the Romans. They were successful in sabotaging half the weapons before being spotted. Octavian then comes out with the First Cohort. Nico states that he is helping both camps and that he will leave once the war is over. Will is upset by this and tells Nico that a lot of campers want to be his friend. Dakota and the Fifth Cohort arrive while the rest of the cohorts are surrounded by monsters. Moments later Camp Half-Blood is lead to battle by Clarisse La Rue, Grover Underwood, Tyson, and Chiron. They are all stunned by Will's whistle, and Nico speaks of peace as Reyna flies the Athena Parthenos into camp as a peace offering. Which works until Gaea awakes.
As the Seven come back to camp, Nico is helping fight the monsters. During the battle, Will comes over to him and whispers "Octavian" in his ear before leading him to an onager, where Octavian is preparing to blast Gaea. Will and Nico try to talk him out of it, noticing that the Imperial Gold he's wearing seems to be attracted to the loaded projectile, but he refuses to listen. He then fires and gets dragged along with the shot. They witness Leo's sacrifice, but Nico senses that Leo's death was strange. He talks with Percy, Annabeth, Jason, Piper, Hazel, and Frank at the Big House, where Frank and Hazel explain Leo's plan tearfully. Chiron asks him to perform the final rites for the fallen demigods, and Nico agrees. He also avoids Will, thinking the son of Apollo would think Nico a monster for having let Octavian die. Later he sits by the campfire and listens as Chiron explains how the two camps have become friends, and that they can visit each other's camp. Then Reyna tells the two camps about Nico's part in saving the camps, brings him out of the shadows, and hugs him, and he tearfully returns it. The next morning Jason knocks on Nico's door, and the two go outside to talk. During this conversation, Nico tells Jason that he will stay at Camp Half-Blood. Nico is then called over by Will who angrily tells him that he does not think Nico's a monster, and then tells him to stay in the infirmary for at least three days. Nico then sees Percy and Annabeth and walks over. They tell him they will attend college and live in New Rome. Nico then tells Percy he had a crush on him and is now over him, earning him Percy's shock and a high-five from Annabeth before Nico goes back to Will.
Between the Series
Several days after the deaths of Gaea and Leo, a parchment scroll with a holographic message, sent from the resurrected Leo, came fluttering into Camp Half-Blood on the wind, with Nico being the one to keep it (in his jacket's pocket) after the other campers had finished re-listening to it. While extremely relieved after learning of Leo's survival (due to him having blamed himself for Leo's death and unable to forgive himself), Nico is also enraged at hearing the news so late, so he resorts to keeping the scroll after everyone else has finished re-listening to it, with Nico looking at the scroll whenever he wants to get angry at Leo.
At some point during the ensuing months, Nico finally comes out and confesses to Will Solace son of Apolloabout having a strong crush on the latter, and the two begin dating. In order to sit together with his new boyfriend during meals, Nico claims to Chiron that he somewhat loses control of his infernal powers while sitting alone at the Hades' Cabin table, and so he is therefore given permission to sit at the Apollo's Cabin's table instead, as Will produced a handy fake doctor's note, and Chiron decided it wasn't worth arguing about.
By September, however, most of Nico's friends temporarily leave camp, with Percy and Annabeth returning to New York to spend their senior school year together, while Jason and Piper depart a month later (spending most of September searching for Leo), to spend their school year in Los Angeles (with Tristan McLean), also taking Gleeson Hedge, Mellie, and Chuck along with them. It can also be assumed that Nico is rarely visited by Hazel and Frank, as he describes them being busy "doing the Twelfth Legion thing” at Camp Jupiter.
Nico meets Apollo, Will Solace, and Meg McCaffrey at the Big House. Nico donned a new outfit: A Ramones T shirt that Apollo liked for music taste, black pants, and a leather jacket. Nico told the fallen god that he had a thick aura and a great possibility of death around him. Will told Nico that they needed another talk for people skills and apologized for Nico’s behavior. Nico told Will to not call him his boyfriend and Will asked what he preferred, and Nico said significant annoyance. Chiron ordered the two to get the other campers for dinner and to go together, using the buddy system. Will asked if Nico wanted to be his buddy, and he called him a dork. Apollo was supportive of his relationship with Will.
At dinner, Nico sat with Will, Apollo, Austin, and Kayla. Apollo thought Will and Nico were so cute together it looked desolate, reminding him of his old relationship with Hyacinthus. Nico explained to Apollo that he had a doctors note to sit with Will at dinner, and that Will was his doctor. Nico also told Apollo the whereabouts of the Seven and Gleeson Hedge. When Apollo asked about Leo, Nico said that if he saw him again, he’d kill him. Nico showed Apollo the scroll Leo sent and said he looked at it whenever he got angry, and how he hated being left in the dark because he didn’t know if he was safe or planning anything. While Chiron talked about the three legged death race, Nico chastised Will for staring at Paolo’s arms, but Will said he was just admiring them after surgery. Nico also told Apollo that Grover was in California with the Council of Cloven Elders. When Peaches came, Nico told Meg to stay out of the way, because he was dangerous. Nico bowed down respectively when Meg was claimed by Demeter.
The next day, at the three legged death race, Will and Nico were partners, tied together. After Will said that he missed Grover and put his shoulder on his, Nico pushed it off and said he’d settle for Coach Hedge, and to not talk about Grover so loudly, since Juniper was over there. After the race, Nico helped Will reattach Paolo’s leg , and gave Will water, saying that was where he needed to be. Nico was angry about the missing campers and the grass withered around him. Will asked him if he wanted to set Valentina’s arm, and Nico said it sounded gruesome, but did it.
Later, when Meg and Apollo went to find the Grove of Dodona, Nico gathered with Will, Malcolm, Paolo and Billie for a going away party. Nico gave Apollo ambrosia for Meg because he could sense that she had a chance of death, making Apollo shiver. Nico smirked when Paolo gave Apollo his bandanna, and listened to what he said, because he understood Brazilian Portuguese. Nico explained that it was Paolo’s good luck bandanna, and that he believed it would make Apollo invincible.
When Apollo showed up to Camp at six in the morning, they took him to Apollo's Cabin to heal him. They wanted to search for Meg in the woods but Chiron wouldn’t let them. When Apollo woke up and started talking to the flowers, Nico was concerned and asked Will if that was normal. Nico told Apollo that he and Will were worried, and put his hand on Will’s shoulder. Apollo told Nico that Meg had until that night at the latest and went to get dressed, and Nico wanted to help him, saying that he could shadow travel him there, but Apollo told him to protect the Camp. Apollo told him that Nero and the other Roman emperors were alive and divine, and ran out of the room, leaving Nico in shock.
Later, Nico and Will were capsized in the middle of a canoe ride when the Colossus Neronis attacked. He and Will rushed to Apollo during the battle and chatted with him. When Apollo asked for his children to come with him, Nico went with them too, because he had a doctors note. Nico then grabbed Will’s hand and shadow travelled to steal Sherman’s chariot, where he convinced Alice, Julia, and Sherman to get off so he could steal it. Austin said he hated it when Nico disappeared. They landed the chariot near Apollo, with Nico half conscious. Sherman was angry that Nico stole his chariot and screamed from the distance. Nico passed out in Will’s arms and Will went to get him Gatorade. Nico was affected in the hay fever epidemic. Percy later mentioned that he almost lost Nico to the enemy.
Later, when Leo returned to camp with Festus and Calypso, Nico ordered a line from the snack bar to punch Leo, where Leo questioned if it was really necessary. When Calypso mentioned Albania, Nico said to not mention Albania. When the line was over, Leo asked Nico if he was done with the physical abuse, and Nico smiled and said that at Camp Jupiter, there were many people who wanted to punch him. Leo winced and asked where they can get lunch. Nico later prepared marshmallows for s’mores for the bonfire on femur bones.
Hazel Levesque mentions Nico when thinking he could help cure Apollo’s scratch. Apollo mentions him when thinking his condition can not be cured with the combined efforts of him, Will, and Pranjal. He is also glad he is not at Camp Jupiter.
Nico is set to appear in the book.
In The Titan's Curse, Nico is ten years old and enjoys playing with his Mythomagic cards that none of the others truly seem to understand, and, as revealed in The Blood of Olympus he was obsessed with pirates even before that. He is clueless and very inquisitive: he is curious and questioning and likes Percy a lot like a big brother (though it is later revealed in The House of Hades that he has secret romantic feelings for him), and begins annoying Percy with his ceaseless questions, especially when he asks if Annabeth Chase was his girlfriend, which makes Percy consider "stuffing him in a meat-flavored sack and throwing him to the wolves." He is excited about finding out that he is a demigod (immediate response: "Cool!"), and starts to compare monsters to Mythomagic creatures. He feels abandoned when his sister Bianca, who practically acts as his parent, becomes a Hunter of Artemis. When she goes on a quest, Nico makes Percy promise to protect her. After her death, he develops a long-lasting grudge toward Percy for letting her die. Once he realizes that he is a son of Hades, he casts away his childhood interests and runs off on his own.
In The Battle of the Labyrinth, Nico becomes grim and solitary, and definitely a considerably more powerful character, saying that "only the dead respect me... and only out of fear." His attitude change may have happened partially because of Bianca's death and partially because of Minos' manipulations. He believes that he will never be accepted by the living, and does not belong at Camp Half-Blood, much like how his father Hades feels out of place on Olympus. Nico is also shown to be somewhat vengeful, as he wanted revenge for Bianca's death, something he blamed Percy for. However, Nico forgives Percy after Bianca's ghost tells him that it wasn't his fault that she died. He also accepts the small figurine of Hades that Bianca wanted him to have.
In the same book, he is shown to be very naive and gullible, being able to believe that Minos was actually helping him bring Bianca back from the dead. Nico cares much about his sister and the constant attempts to bring her back show that he would not give up without trying. Nico is shown to be very loyal to the Olympians, as he could have easily joined Kronos and the Titans, but chose to fight on the Olympians' side.
In The Last Olympian, he is quite sincere in wanting to help Percy with the prophecy and the war. However, Nico can be somewhat untrustworthy at times. This is shown when he tricked Percy into coming to the Underworld so he could gain answers about his mother, but Nico wasn't planning on Percy becoming imprisoned. By standing up to both Kronos and Hades, he is shown to be that he is very brave and bold. In fact, the only time Nico himself is ever shown to be terrified, is in The House of Hades, when he was forced to face Cupid, implying that Nico's greatest fear is exposing his homosexuality. He likes being on his own, not really wanting help from anyone. He keeps to himself a lot and is pretty secretive, which causes plenty of problems throughout the series. Nico wants to help Percy and was very miserable at the thought that Percy did not trust him after his dad tricked him as well, by the end, they were back to a brotherly relationship.
While he tries hard not to show it, Nico is plagued by incredible internal pain, mainly due to him being unable to come to terms with not "belonging" in the twenty-first century (due to the time he spent in the Lotus Casino), not being accepted by other demigods as a son of Hades, and, worst of all, his homosexuality (which he is desperate to keep secret). Some of his fears about not being accepted due to being gay, most likely come from growing up in the 1940s, where homosexuality was not accepted. At some point during his horrifying journey through Tartarus, Nico encounters the goddess of misery Akhlys, who was impressed at how much sorrow and pain the son of Hades carried, claiming that there was little more that she could do to him. When Reyna shares her strength with Nico in The Blood of Olympus, she is horrified at how much pain and raw anguish she felt inside the son of Hades, even a portion of it is greater than what she had felt from even her entire legion during the battle against the giant Polybotes. When Reyna accidentally learns about Nico's homosexuality, she, much to Nico's surprise and relief, doesn't judge him, and still accepts him as a friend just as he is, without hesitation. Reyna's acceptance was what most likely gave Nico the courage to finally come out to a very surprised Percy and Annabeth, but he admits to being over his formerly strong crush on Percy and is now genuinely happy for Percy and Annabeth. Hence, Nico is finally willing to become more sociable and more open about himself and his feelings to others, no longer nearly so insecure about his homosexuality, to the point that he is completely open about it six months later in The Hidden Oracle. Nico, apparently, also has tremendous, virtually indomitable willpower, since he was able to survive in Tartarus on his own while seeing the place in all of its ineffable horrors for the entire time that he spent there. Percy, who found even a few moments of seeing it maddening, marveled how Nico had managed to survive with his sanity.
Nico is later proven wrong in the belief he will not be accepted by the living. After the war with Kronos is over, all the demigods of Camp Half-Blood welcome Nico cheerfully: as Percy puts it, "Hey, show up with an army of undead warriors to save the day, and suddenly you're everyone's best friend." This helps lift Hades's curse from the Oracle. Sadly, however, Nico's popularity only lasted a few weeks, after which most campers did whatever they could to avoid the son of Hades and forgot he was at camp. However, when Nico mentions his plans to leave for good, due to his lack of acceptance, Will Solace gets upset and tells him that there are actually many people at camp who are his friends or would like to be, but it is Nico who pushes himself away. Will also states that the camp did not reject him as he had thought. This indicates that Nico may have misinterpreted the campers' reactions to him, or exaggerated it in his own mind, due to his fears of non-acceptance. After Gaea is defeated, when Reyna tells the two camps about Nico's part in saving both of them and gives him a big hug, the crowd of demigods roared with approval, indicating that thanks to Reyna, both Camp Half-Blood and Camp Jupiter have finally come to truly accept the son of Hades. As a result, Nico decides to give Camp Half-Blood another try, finally seeing that he is accepted.
In spite of Nico pretending not to know Percy in The Son of Neptune, he spoke very highly of him to Hazel, telling her that he is dangerous to his enemies and a valuable ally to his friends. Nico's relationship with Percy also shows how much he's grown and matured throughout the series. Nico is very caring to Hazel Levesque, his half-sister, and tries to help her as much as he can. His helping her sort of parallels with how Percy helped him in several cases. This shows that he loves his family, even his half-siblings. Unfortunately, after returning from Tartarus in The Mark of Athena, Nico is very different. He turns more inward and withdrawn, with his eyes becoming somewhat glassy like something in him broke permanently. Percy compares him to pictures of prisoners of war, which he notes Nico kind of was. Hazels states in The House of Hades that Nico has become more reclusive and morose, preferring to stay on top of the ship's mast, in solitude. Nico becomes much more easily angered, defensive, and takes to making creepy and humorless smiles. Nico, however, has happily smiled on two occasions: in The Last Olympian, right after he helps Hades defeat Kronos' army and gains his father's respect, and in The House of Hades after he and Frank defeat Gaea's monsters at the Necromanteion. In The Blood of Olympus, Nico notes that his facial muscles hurt when he smiles since he isn't used to making that expression often. Even though Nico seems to dislike being touched, he is shown to be very affectionate towards Hazel, having kissed her on the cheek several times. However, by the end of The Blood of Olympus, Nico begins to change and doesn't seem to mind when Jason and Reyna embrace him.
Nico can be extremely dangerous as he is a son of the Big Three. He is very unpredictable, and due to his sister's death can be somewhat mentally unstable as demonstrated in The Battle of the Labyrinth, and Octavian even claims to see a decent amount of ruthlessness in Nico. He has a short temper, just like Percy and Thalia. When Jason causes him to lose his temper in The House of Hades, Nico's fury was so intense, that it even scared Jason, who felt that a furious Nico was "more than he could handle." However, the greatest and most volcanic demonstration of Nico's fury happened in The Blood of Olympus, when he faced the psychopathic Bryce Lawrence. A furious Nico, in one horrible cry, unleashes a "flood of pain and anger" on Bryce, Reyna, and Coach Hedge, with the temperature around Nico dropping to freezing (turning the ground around him white with frost), Bryce's zombies instantly disintegrating, and a terrified Bryce himself turned into a mindless ghost.
This otherworldly demonstration of Nico's sheer rage when unleashed upon those cruel enough to invoke it was one of the most frightening events in the series. Suffice it to say that no one and nothing would be wise to provoke the son of Hades.
By The Hidden Oracle, Nico is much happier and more involved in the camp. He spends most of his time with his boyfriend Will, and is no longer insecure about being gay (although he is still slightly uncomfortable with being called Will's "boyfriend"), and is considerably more relaxed around people, even roasting marshmallows on a campfire, joining in with the campers' sing-a-long, and helping Will tend to wounded demigods in the infirmary. Overall, Nico is very supportive of his boyfriend, even impressing Will's father Apollo.
|“||Holding grudges has always been the fatal flaw of children of Hades.||”|
As finally revealed in The House of Hades, Nico's greatest fear is of someone finding out that he is gay. Therefore, he never stayed at either camp for long and did not make connections of friendship with most people, so as to keep them from finding out, becoming more isolated than any other demigod. This fear about not being accepted due to his sexuality most likely originates from Nico's upbringing in the 1940s, when homosexuality was not accepted. Hence, in The House of Hades, when Cupid forcibly makes Nico reveal his secret in front of Jason, the usually intrepid Nico is nearly reduced to tears. When Reyna accidentally learns about his secret in The Blood of Olympus, she, much to Nico's surprise and relief, doesn't judge him, and still accepts him as a friend just as he is (though she is still very surprised at this revelation), supporting him without hesitation. Reyna's unconditional acceptance and support was what most likely gave Nico the courage to finally come out to a very surprised Percy and Annabeth at the end of The Blood of Olympus, indicating that Nico has finally begun to overcome this immense fear and insecurity of his. And by The Hidden Oracle, it is indicated that Nico has finally fully overcome it at some point during the six months after Gaea's defeat, finally coming out and confessing his crush on Will Solace, with whom he begins an official romantic relationship.
AppearanceNico is said to have black hair that always looks like he just got out of bed (messy and shaggy) and olive skin. By The Battle of the Labyrinth, his skin has paled to white, and he takes to wearing black clothing with skeletal designs, a Stygian Iron sword and a silver skull ring (by the end of the book). By the time he meets Hazel Levesque, she describes his fingers as ghostly white, like their father's. It was stated by Percy that Nico has his mother's eyes, but it has also been said that he has the wild glint of a madman too, just like his father. According to Percy, Nico's hands are "as cold as ice."
By the end of The Battle of the Labyrinth, he has a silver skull ring which was Bianca's last gift to him and is said to belong to his father (as stated by Hazel). He also has a Stygian Iron sword always by his side in his chain belt. He is also mentioned on several occasions wearing an aviator's jacket, most likely because he was originally from WWII. Nico wears a black trench coat when he attempts to bring back Bianca, as shown in one of Hazel's blackouts. In The Last Olympian, Nico wears black battle armor with a skull-shaped helmet. In The Son of Neptune, Nico is seen wearing a black toga when Percy goes to talk to the senators (the reason being that togas are only worn on special occasions, like meetings). In The Mark of Athena, Nico appears weaker, thinner, and even paler than usual, while his eyes are described as "looking like shattered glass," due to his ineffable experience in Tartarus.
Days later, in The House of Hades, Nico has begun to recover and regain his strength, but is still described as "painfully thin," with his black shirt and jeans hanging loosely from his "skeletal frame." His dark hair is longer and frames his face. However, the area around his sunken eyes is very dark, while his complexion is even paler than before," a sickly greenish-white, like the color of tree sap." Being a demigod from another era, Nico radiates "a kind of old energy - a melancholy that came from knowing he didn't belong in the modern world." Nico is also the only one whose skin doesn't get tanned in the hot northern African sun, and if anything, looked even paler than before, according to Jason.
Jason comments that since getting out of Tartarus, Nico "had slept little and eaten even less." Seeing Nico casually eat a grape, he thinks that that will be his food for the day. Later, Jason is surprised that Nico actually has visible muscles when he takes off his jacket. According to Hazel, when upset, Nico's face would become "as dark as Tartarus." When Jason infuriates him, the ground opens up and Nico "glows with ghostly light." When Bryce infuriates him, the temperature around Nico drops to freezing, turning the ground around him white with frost. Several demigods, including Leo, Frank, and even Jason all admit to being afraid of the son of Hades.
In The Blood of Olympus, due to the stress of having to shadow-travel vast distances every day, Nico's skin gains a bluish tint, and his cheeks are sunken. After his aviator's jacket and black skull-pattern shirt are both torn to shreds, Nico begins wearing a tropical Puerto Rican shirt, decorated with parrots and palm trees, and with Isla del Encantorico written on it. His biceps are swollen and severely scarred from his fight with Lycaon, and after Reyna stitches them up for him, it gives Nico "a slightly creepy Frankenstein look," to the point that mortals on the street are scared off at the sight of him.
In The Hidden Oracle, Nico wears black trousers, a Ramones T-shirt, and a black leather bomber jacket, with his Stygian iron sword at his side.
Abilities and Tools
- ADHD: Like most demigods, Nico possesses inborn supernatural battle reflexes and senses that he uses to analyze the fighting style of his opponent.
- Dyslexia: Nico's brain is "hard-wired" for divine Ancient Greek instead of modern languages.
- Fighting skills: Initially, Nico shows more skill with his powers than his fighting skills. However, this might have been due to his lack of formal combat training at camp. In The Demigod Files, he did show decent combat skills when he was able to keep up with Percy and Thalia when they fought a group of Keres. Not only did Nico emerge unscathed from the battle, but he easily defeated the Keres he fought. Later, he even fought the Titan Iapetus alongside Percy and Thalia (but he was quickly incapacitated). In The Last Olympian, Nico fights in the Battle of Manhattan, and emerges unscathed, implying excellent fighting skills, which impress even the Ares demigods. In The Son of Neptune, Hazel mentions being impressed the first time she saw him fight, suggesting that he honed his skills between the two series, possibly during his stays at either Camp Half-Blood or Camp Jupiter. Nico was even able to fight Gaea's army in Tartarus itself, though he was eventually overwhelmed by their sheer numbers. In the House of Hades, Nico fights the enormous monster army of Gaea, while holding the Scepter of Diocletian high, and emerges unscathed after the battle is won, implying excellent swordsmanship. During that battle, Nico single-handedly overwhelmed an entire group of mighty Earthborn, slashing them into mounds of wet clay with his sword. In The Blood of Olympus, though somewhat weakened from shadow-travelling, Nico is still able to single-handedly quickly overcome 6 Roman legionnaires (while protecting Will Solace), and it should be noted that Nico was not even fighting to kill, only to knock them out. He later makes short work of Octavian's elite guard (6 huge dog-headed cynocephali). In the final battle with Gaea's troops at Camp Half-Blood, Nico fights at the front lines, managing to defeat numerous other monsters before being forced to leave (in order to confront Octavian at one of the onagers).
- Mythomagic: Nico's knowledge of the game is superb, as he had the rare Africanus Extreme expansion deck, and remembers each figure, as well as the number of attack and defense moves of each. Thus, he was able to identify Dionysus, a Manticore and even a Katoblepone.
- Ancient Greek: In The Battle of the Labyrinth, Nico demonstrates his ability to summon the dead by chanting in Ancient Greek.
- Italian: In The House of Hades, Nico shows that he can speak fluent Italian, as he is Italian by birth. In addition, as shown in The Blood of Olympus, Nico's knowledge of Italian helps him somewhat understand some other Romance languages, such as Spanish and Portuguese (therefore notably being one of the few to understand Paolo Montes).
- Will Power: Nico, apparently, has tremendous, seemingly indomitable willpower, since he was able to survive in Tartarus on his own, while seeing the place in all of its ineffable horror for the entire time he spent there. Percy, who found even a few moments of seeing it maddening, wondered how Nico had managed to survive with his sanity.
- Pain Resilience: Nico was able to endure immense amounts of both physical and mental pain (notably even scars inflicted by Lycaon which "burned like acid"), much to Reyna's amazement and respect.
As a son of Hades, Nico is an extremely powerful demigod. He is considerably more trained in using his powers than most children of the Big Three, such as Thalia and Percy, due to his time spent in the Underworld and he states that he trains with the dead. In The Son of Neptune, Hazel stated Nico was the most powerful demigod she'd ever seen (to the point that she compared his power to that of a nuclear bomb), an impressive admiration given that she knew Jason Grace and dozens of other demigods (though meeting Percy caused her to question this judgment). In The Blood of Olympus, Reyna mentions that after being healed from his injuries by Hedge and resting for several days, Nico becomes significantly more powerful than ever before. Hazel once stated that she and Nico each control an aspect of Hades/Pluto's powers: death (for Nico) and riches (for Hazel).
- Geokinesis: Nico can control the earth - levitating rocks and making them deadly, black, and extremely sharp. Nico can open fissures in the earth that can swallow up creatures and trap them in the Underworld. He can cause earth tremors so powerful, they can shatter the pillars of a mountain fortress. He can also control the black walls of the Underworld. His geokinetic abilities are only surpassed by his half-sister, Hazel Levesque and his father, Hades.
- Necromancy: As a son of Hades, Nico has control over the dead, as well as many monsters native to Hades' realm, such as the Furies.
- Power Over the Undead: Nico can reanimate skeletons, summon Skeleton Warriors, put them to sleep, and destroy them. In The Battle of the Labyrinth, Nico was able to permanently banish Minos to the Underworld. In The Last Olympian, he was able to summon a large army of undead soldiers all by himself. It is unknown how much he has increased in power since then. This is an extremely powerful ability as it literally allows him to have an army anytime he wants. However, summoning too many undead warriors at one time can cause him fatigue. As shown in The Blood of Olympus, when he is angered enough, Nico can destroy even undead warriors that aren't under his control, which he does with Bryce Lawrence's zombie troops. Whenever he needs a personal chauffeur, Nico summons Jules-Albert, a loyal French zombie.
- Summoning Deceased Souls: as shown in The Battle of the Labyrinth, Nico can summon souls of the deceased by digging a pit, filling it with food (though animal blood can also be used), and chanting in Ancient Greek.
- Releasing Souls: as shown in The Battle of the Labyrinth, Nico can release the souls of people that should have died but had somehow managed to cheat death, such as Daedalus.
- Telepathy With The Dead: In The House of Hades, Nico warns the Lemures of Venice (angry spirits) to stay away from him, Hazel and Frank by giving off a warning vibe.
- Sensitivity to Death: Nico can sense death as it happens or when it is coming; when a person close to him dies, it comes as a ringing in the ears. In addition to that, he has a deep knowledge of the Underworld and knows when a person's life is being judged in the Underworld. Nico can also sense when an immortal is fading, as in the case of Pan in The Battle of the Labyrinth. His powers are so great he could even sense that Percy and Annabeth were close to the Doors of Death within Tartarus.
- Life Aura: Nico can sense someone's life aura (he sensed it when Rachel Elizabeth Dare's life aura flickered in The Last Olympian, and he told her, "I could see you dying."), and when Apollo became mortal in The Hidden Oracle Nico sensed an aura of death around him — "a thick possibility of death."
- Seeing the Power of the Doors of Death: Along side Hazel and Jason, Nico can see and feel the power of the Doors of Death.
- Power Over Ghosts: as the Ghost King, Nico can physically manipulate ghosts, such as taking hold of them by hand or forcing them to be silent with a gesture.
- Ghost Transformation: As seen in The Blood of Olympus, Nico can kill mortals, demigods and legacies by turning them into ghosts, and forcing them into the Underworld for eternity. Nico has only ever done this to Bryce Lawrence. However, this takes away a lot of his strength and may cause him to fatigue as he did after he killed Bryce Lawrence.
- Osteokinesis: As seen in The Blood of Olympus, Nico is able summon and telekinetically to control bones. Prior to his fight with Lycaon in Évoria he could only summon a few bones and skulls. But during his encounter with the wolf king he was able to summon hundreds of bones, enough to trap Lycaon and his wolves for a few minutes showing that his abilities improve extremely quickly.
- Death Trance: In The Mark of Athena, when he is sealed in the Bronze Jar, Nico shows that he can go into a hibernation called a Death Trance using the seeds of Persephone, which can only be eaten by a child of Hades. The Death Trance induces him to essentially die for a day, meaning he consumes no oxygen and doesn't need any kind of food (besides the seeds).
- Umbrakinesis: Nico has control over darkness and shadows for various uses such as solidifying it for attacks and to hide in it.
- Shadow Travel: Nico can use shadows as a way of transportation; however, great distances tend to wear him out. The first time he shadow traveled, he passed out for a week. He has said that while learning to use it, he ran into walls and made accidental trips to China. He seems to have gotten better control over it because in The House of Hades, he implied he could use shadow travel to send the Argo II across a mountain range, but was too weak because of his time in Tartarus. When he recovers his strength by the end of the The House of Hades, he decides to transport the Athena Parthenos across the ocean by shadow-traveling about three hundred miles at a time. However, as revealed in The Blood of Olympus, overexertion of shadow travel can cause the user's molecular structure to begin to fall apart, gradually turning them into shadows and lose themselves. Due to Nico pushing himself to bring the Athena Parthenos to Camp Half-Blood, he began to lose himself, even entering a "shadow coma".
- Shadow Absorption and Dissipation: as shown during his fight with Clytius in The House of Hades, Nico can also dissipate and absorb shadows with his sword, since he kept the Giant's dark aura from affecting his friends.
- Darkness Generation: He can shoot solid bolts of darkness, and surround enemies in pitch-black clouds of lightless space.
- Darkness Shields: He can solidify shadows into virtually impenetrable shields.
- Invisibility: He can use shadows to cover himself in darkness to become invisible.
- Umbrakinetic Healing: He can heal himself and others using darkness (minor injuries).
- Thermokinesis:Nico has been shown to generate extreme temperatures to the point of combustion and freezing. However he has yet to control the fire and ice he generates.
- Cryokinesis (limited): As seen in The Blood of Olympus, when Nico is infuriated, he generates an aura of intense cold, making the temperature around him drop to freezing, with the ground around him and the massive cairn turning white with frost.
- Pyrokinesis (limited): When Nico swallowed up the four skeleton warrior attacking him and Percy in The Titan's Curse, "flames erupted from the fissure."However, it is not known how powerful his control over fire actually is.
- Hypnokinesis: as seen in The Blood of Olympus, Nico can navigate through "the dark dreamscape" of dreams better than most other demigods (and is only somewhat surpassed by demigod children of Hypnos, like Clovis), since he claims that dreams and death are "old friends of his." Hence, Nico has a higher degree on control over his dreams, the ability to astral project his consciousness, find and enter the dreams of other demigods. Reyna notes that Nico can have an extremely heavy sleep at times, to the point that he won't even budge if Coach Hedge does a goat-hoof tap dance around Nico's head. Later in the book, Nico puts several mortals to sleep by sending deep dreams their way.
- Phobikinesis: Nico radiates an intense aura of fear and death like his father, Hades, but to a much lesser degree. In The Last Olympian, this aura was so strong that Kronos' monsters initially backed away from him. In The House of Hades, he is shown to radiate death from nervousness, as when Cupid intimidates him, "the grass turned brown and wilted" at his feet, as if "poison were seeping from the soles of his shoes." Even while he was still emaciated and weakened from Tartarus, even a demigod as brave as Jason Grace admitted to being afraid of Nico, possibly due to this fearsome aura in part.
- A Stygian iron sword. It is three feet long, and in The Last Olympian is described as being "black as a nightmare." It helps Nico to channel his power to control and summon the dead, and it can also drain souls to give the sword more power. Only Hades, his children and Clytius can use Stygian Iron for their weapons.
- He is seen wearing black armor in The Last Olympian with a skull shaped visor.
- A skull ring shown in The Battle of the Labyrinth, The Last Olympian, and The Son of Neptune. Twisting it makes the nearest dead restless. He usually uses it to relieve tension.
- Mythomagic figurines and cards. He throws them into a fire in anger during The Battle of the Labyrinth.
- In The Battle of the Labyrinth, he had a pair of Daedalus' wings, but after he used them, he threw it away in a trash can.
- A red travel rose that he didn't use, given to him by Persephone, in The Sword of Hades.
- Pomegranate Seeds - magical seeds from Persephone's Garden in the Underworld. If he places them on his tongue, he can go into a death like trance that allows him to use less air and energy, in the event he is captured. This allows him to go into what is called a "Death Trance," which he uses to sustain himself during The Mark of Athena.
- Diocletian's Scepter: Nico obtained the scepter after he confessed his feelings for Percy, the scepter allows him to summon zombie legionnaires to his aid - he can not control them however, as his is neither a Roman demigod nor a Roman officer. He used the scepter to summon zombies at the Necromanteion and Pompeii to fend off Gaea's forces, after which it exploded.
|“||But it's cool. We're cool. I mean, I see now . . . you're cute, but you're not my type.||”|
Young Nico had the ability to annoy Percy quite easily, as seen in The Titan's Curse when he asked Percy several questions about his relationship with Annabeth. Nico developed a secret but very strong crush on Percy, as he was "Nico’s favorite game, Mythomagic, brought to life." Near the end of the book however, Nico begins to blame Percy for his sister's death, making him much more cynical, but still doesn't let the Skeleton Warriors harm him, and "leaves Camp Half-Blood because of love". Nico later claims that realizing his crush would plague him with self-hatred and resentment for Percy. Percy, true to character, feels partially at fault and responsible for Nico leaving.
In The Battle of the Labyrinth, Percy receives Iris Messages from Bianca regarding Nico. The two later meet at Geryon's ranch, where Percy makes a bet with Geryon. Nico is included, which angers him, as he shouts that he doesn't want any favors from Percy. After Percy defeats Geryon, he and Nico talk to Bianca, who tells Nico to stop holding a grudge against Percy when it is she he is angry with. By the end of the book, Nico has forgiven Percy. In the last chapter, he appears and informs Percy of a plan he has.
In The Last Olympian, Nico leads Percy to his father's palace in order to gain information on his mother, not knowing that Hades plans to lock Percy up. Percy feels betrayed, even when Nico eventually tries to help him. After Percy bathes in the Styx, he tells Nico to stay and convince Hades to join the Olympians in battle. Nico appears glum, stating that Percy can't trust him anymore. The two join to battle in final battle and Percy forgives Nico. It is later revealed that when Nico planned to get Percy to bathe in the River Styx, he had hoped that this would make Percy fall in love with him.
After Percy has lost his memory in The Son of Neptune, Nico pretends to not know him, and it's later revealed in The Mark of Athena that Hades had told him the time was not right for Percy to know. Once Percy regains his memory, he feels the urge to strangle Nico for not telling him.
In The Mark of Athena, in Percy's narration, it is mentioned that Percy had wanted to strangle Nico about what he did, but doesn't, due to how Nico is after being kidnapped. Nico states (after Annabeth and Percy's fall) that Percy is the most powerful demigod that he knows. During Nico's kidnapping, Percy doesn't give up on finding him, showing that he cares a lot about him. After Nico is rescued Percy can tell that Nico may or may not have seen something in Tartarus that shattered him permanently, which shows that they know each other well, despite their previous situations.
In The House of Hades, Nico's true feelings towards Percy are finally revealed when he is forced to admit that his feelings for Percy run deeper than friendship, as he had a crush on Percy. Jason is with him at the time and keeps the secret for him. Percy knows nothing of these feelings and does not return them, though he does care for him like a brother and while in Tartarus realizes Nico is another friend he hasn't treated very well. At some point, Nico had visited Iapetus in the Underworld, and told him that Percy was a friend. It is more than likely that Nico assisted Percy multiple times in the past due to the crush he had on him. For instance, it is later revealed that when Nico planned to get Percy to bathe in the River Styx, he had hoped that this would make Percy fall in love with him.
Although Nico states in The House of Hades that he gave up on Percy, there are several parts in the book that imply otherwise. Favionus calls Percy, though not by name, "the one [Nico] cares for most," and Hazel notices that Nico has a pained look in his eyes at seeing Percy and Annabeth hold hands. However, because she doesn't know of Nico's crush on Percy, Hazel believes that the pain is from Nico having gone through Tartarus alone.
When Nico and Hazel Shadow Travel the group out of the Necromanteion, Nico realized that he was holding Percy's hand after everybody else let go, and quickly lets go. Later on, when Nico goes to transport himself, Reyna, and the Athena Parthenos, Percy comes to thank him for keeping his promise and tries to pick up their tattered friendship, Nico, afraid of his feelings, asks Percy to give him space and leave him alone, much to Percy's confusion and hurt.
In The Blood of Olympus, Nico sees Percy and Annabeth together, laughing. He approaches the couple and tells Percy that he previously had a crush on him, but that he's over him. He states that he's happy for the two and Percy seemed to be fumbling for his words. He continues and announces, that they're cool. He calls Percy cute but says that Percy is not his type. Once the confrontation was over, Nico received a high-five from Annabeth.
In The Blood of Olympus, it's hinted that Nico has developed an attraction to Will Solace, as they fought alongside each other. The two argue, but Will is shown to be able to withstand Nico's temper, and even order him around a bit. Nico develops an admiration for Will, who he hadn't thought greatly of before. At one point, Nico remembers his first arrival to camp in Apollo's sun chariot, and how Thalia had thought that Will's divine father was hot. While Nico didn't understand suddenly remembering this, it is most likely an indication of his budding feelings for Will, since Will is Apollo's son and shares physical traits with him. In the aftermath of the battle, Nico avoided Will, believing he was disgusted with him for allowing Octavian to kill himself, showing he cared very much about Will's opinion of him. To his surprise, Will is more upset that Nico didn't offer to help him, or more importantly, spend time with him after it was all over. Will ordered Nico to stay with him in infirmary for three days, and Nico "felt like a hundred skeletal butterflies were resurrecting in his stomach". Will also seems to reciprocate said feelings, or at the very least, is willing to be closer friends with the son of Hades.
In The Hidden Oracle it is revealed that shortly after Gaea's defeat, Nico finally comes out and confesses to Will Solace about having a strong crush on the latter, and the two begin dating, with Will at one point affectionately referring to Nico as his boyfriend. Will's father, the former god Apollo, is completely supportive of their relationship, due to him having had several mortal boyfriends himself. They continue their playful banter with each other, and are usually seen sitting close by, holding hands. In fact, Apollo claims that Nico and Will are so cute together as a couple, that it made him feel desolate, jogging his memories of the time he had spent with his mortal boyfriend Hyacinthus, one of Apollo's two all-time favorite lovers (the other being Daphne). Nico on his part, is always ready to help and support Will, such as when he tirelessly helped his boyfriend tend to wounded campers (notably Paolo Montes and Valentina Diaz). Nico also showed some jealousy when he caught Will staring at Paolo, but Will stated that it was nothing and that he was merely admiring how well his arms were functioning after surgery.
While their friendship is not mentioned extensively, Nico respects Annabeth and is at times shown to listen to her more than Percy, possibly to annoy him. However, in The Battle of the Labyrinth, his view of her improved to the point of friendship, as he chose to save not only Percy, but Annabeth as well when he named himself the Ghost King.
In The Mark of Athena, it is revealed that Annabeth has always had mixed feelings about Nico di Angelo, and suspects that he had a crush on her. However, Annabeth herself has no feelings for him beyond kinship, since he is too young, too moody, and has a certain darkness in him that makes Annabeth uneasy. Furthermore, she has always found it hard to "read" Nico and his actions. However, Annabeth still admits to feeling responsible for him, and can relate to feeling like Nico did after Bianca's death—a homeless orphan, drifting through the world alone.
In The House of Hades, it is finally revealed that Nico was actually jealous of Annabeth, not in love with her, due to her relationship with Percy (his actual love interest), which is why Nico initially didn't want to be around her. After seeing Annabeth and Percy holding hands, Nico looks pained, showing that his secret crush on Percy is as strong as ever.
In The Blood of Olympus, it is revealed that after her return from Tartarus, Annabeth went out of her way to thank Nico for being nice to Iapetus (even before Percy did so), and telling the Titan that Percy is worth saving. While Nico is still very jealous of Annabeth, and wants to hate her, he cannot bring himself to, since Annabeth's gratitude was genuine and sincere, and she never overlooked or avoided Nico like most people. Hence, Nico admits to himself that it would have been far easier for him if she were a horrible person. Later in the book, when Hades reveals to Nico that one of the Seven is destined to die, the idea of any of them (even Annabeth) dying made him feel empty—like he was back in the dark Giants' Bronze Jar. By the end of the book, Nico finally finds the courage to tell Percy and Annabeth about his past crush on Percy, coming out for the first time. By that point, however, Nico has come to realize that Percy is not his type, and that he is genuinely happy for Percy and Annabeth. While Annabeth is certainly shocked at such an unexpected revelation from Nico, she smiles at the son of Hades and high-fives him.
Nico and Annabeth are on good terms. In the Camp Half-Blood Confidential, Nico, Percy, and Annabeth helps with the FAQ. Nico is also happy that Annabeth is at camp.
Before meeting him in The Mark of Athena, Leo voices his doubts about Nico's loyalties, infuriating Hazel. Later on, after meeting him, Leo considers Nico creepy, unlike Hazel. They have not gotten to know each other yet, but seem to be on good terms so far, as when Leo is overwhelmed with guilt about not saving Percy and Annabeth, Nico comforts him and assures him that they are alive.
In The House of Hades, Nico seems annoyed with Leo's frustration about constantly rebuilding the masts, saying that they don't grow on trees. Nico corrects him by calmly pointing out that they are made from trees. Leo is very much intimidated by the son of Hades, and never dares to tease him to his face. Nico, being far more serious, is frequently annoyed by Leo's sense of humor. After Leo returns from Calypso's island, Nico is glad to see him, and shakes his hand.
In The Blood of Olympus, when Hades reveals to Nico that one of the Seven is destined to die, the idea of any of them (including Leo) dying made him feel empty—like he was back in the dark Giants' Bronze Jar. Nico is quite saddened by Leo's death, does his best to comfort Hazel about it, and prays to his father for guidance.
In The Hidden Oracle it is revealed that a resurrected Leo was able to send a parchment scroll with a holographic message several days after his and Gaea's deaths. While almost all of the campers are both exuberant and furious, Nico is affected more deeply than most (due to him having blamed himself for Leo's death), and therefore he keeps the scroll in his pocket long after other campers had finished re-listening to it, and he resorts to looking at it whenever he wants to get angry at Leo. When Leo finally returns, Nico is in charge of having the other demigods get in line to both punch and greet the returned son of Hephaestus, with Nico being the last one to do so.
Interestingly, some things that Nico and Leo have in common, is that they both fluently speak a Romance language (Italian and Spanish respectively), they have both witnessed their mothers' deaths at the hand of a deity (Zeus and Gaea respectively), they have both had an embarrassing experience in Albania, and they have both run away from places they used to call home (Camp Half-Blood and multiple foster homes respectively).
Frank and Nico met before the events of The Son of Neptune . Frank is the only kid not uneasy around children of Pluto at Camp Jupiter. In The Mark of Athena Frank does not doubt Nico's loyalties to the group.
In The House of Hades Frank says he had always been uneasy around Nico and feared going anywhere with him alone. Frank still makes an effort to befriend him and talk to him. When Hazel is poisoned, Frank becomes furious with Nico, but quickly forgives him and helps him after he was turned into a plant. He’s also always wondered about his past and they both have played Mythomagic. He also calls Nico his friend to Tripoltemus. After Frank murders the Katobleps, Nico calls him brave.
After they see Tripoltemus, Frank is worried about Nico, who is acting more reclusive.
At the House of Hades Frank and Nico helped each other out trying to find the Doors of Death, and Nico helped Frank control the ghosts he summoned, and indirectly led to Frank becoming praetor. Nico actually laughs and smiles when Frank controls the ghosts.
In The Blood of Olympus Frank and Nico talk in Hades cabin and he playfully jokes and threatens Frank. Frank tells Nico he always has a place at Camp Jupiter and encourages him to come with him and Hazel.
|“||Easy for you to say. You're everybody's golden boy, the son of Jupiter.||”|
Jason met Nico at Camp Jupiter at once point. Before rescuing him in The Mark of Athena, Jason voices his doubts on Nico's loyalties, infuriating Hazel.
In The House of Hades, Jason is still creeped out by Nico, and fears going alone with him. The two go to find the Scepter of Diocletian in Croatia. Jason flew Nico into the sky, which makes Nico angry about being touched. When Nico is nervous, Jason comforts him, even though he thinks it’s just a crush on Annabeth. When the two arrive in Salona, Jason is grateful to have Nico there with him. When Cupid attacks and comes after Jason, Nico tells Cupid to come after him instead, subjecting him to bullying and harassment by Cupid. Jason sees events from Nicos perspective and finds out Nico had a crush on Percy. Jason promises to keep it a secret and calls Nico brave.
After the events, Jason is a lot more concerned for Nico and even defends him when Leo calls him creepy. At Auster’s palace, Jason encourages Nico to take a risk be his friend and that everyone will accept him for being gay, and that’s who he is. Jason also tells Nico to stop running away and stop hiding, which angers Nico.
At the House of Hades, Nico gives Jason the chalice first to drinkand asks him if he trusts him, which he does without hesitation, signifying that Nico trusts him. At the battle, Nico and Jason stick by each other and Jason catches Nico and protects him from falling at one point. When Nico says he is going with Reyna to retrieve the Athena Parthenos, Jason trusts him and knows he will be okay.
While Nico is gone, the two think about each other all the time. Jason is grateful for Nico and his actions at the House of Hades. Jason worries about him and is grateful that he went to bring the Athena Parthenos. Every time Jason sacrificed his food to Jupiter, Jason prays for him to help him. Nico, on the other hand, is still embarrassed about Salona and when Jason picked him up. Nevertheless, Nicos primary concern other than Hazel is for Jason.
At the battle to kill Gaia, Nico and Jason stop to talk. Two days after, Nico comforts Jason over Leo’s death. When Jason finds out Nico I’d staying at Camp Half-Blood, Jason hugs him, which Nico accepts, and talks about all the fun they will have. Nico pretends to be annoyed, but Nico believes that he’s actually excited for him to stay.
|“||You're the most courageous demigod I've ever meet, Reyna. I—I won't let you down.||”|
Through their relationship is not directly shown in The Son of Neptune, it can be concluded the they are on good terms. They have obviously interacted before, with their first encounter being when Nico asks her to accept his sister, Hazel, into the legion. Back in Camp Jupiter, Nico was a Senator and the Ambassador of Pluto, and therefore possibly involved in the camp's political life along with her. Dakota says that Reyna has no idea what to do with him when he arrives, however. At the end of The House of Hades, Reyna is willing to travel with Nico under very dangerous circumstances, showing that she at least does not doubt the son of Hades' loyalty.
In The Blood of Olympus, the two grow close over the course of their journey. Reyna lends Nico strength to shadow-travel, and, as a result, she learns quite a bit about his past and the tremendous internal pain that he's been harboring. She is horrified at the amount of internal turmoil, and is determined to support him, and starts thinking of him as a younger brother in spite of herself. Eventually, the two open up to one another, as Reyna describes how she killed her father in Puerto Rico (something she'd never told anyone up to that point), and Nico his issues with his father, how he suffered through Tartarus and the feeling of not belonging at either camp. Also, Reyna is the first person that Nico tells about Jules-Albert, his French zombie chauffeur.
Reyna later witnesses him kill Bryce Lawrence and seems horrified at the ferocious display of Nico's infernal powers. At that moment, Nico accidentally generates a "flood of pain and anger" on everyone present, allowing Reyna to finally experience his hardships from his point of view and also see Nico's greatest fears and secrets (including his homosexuality and his crush on Percy). Much to Nico's surprise and relief, however, Reyna doesn't judge him, still accepts him as a friend just as he is, without hesitation, and cares for Nico's wounds while he recovers from his encounter with Bryce.
In addition, Reyna appears to be in awe of Nico's powers, especially after learning that he also possesses hypnokinetic abilities. Nico, in turn, respects Reyna quite a bit, and by the end of their journey to Camp Half-Blood, he even calls her the most courageous demigod he'd ever meet.
After Gaea's defeat, Reyna tells the two camps about Nico's part in saving both of them, brings him out of the shadows, gives him a big hug, and he tearfully returns it, burying his face in Reyna's shoulder. The crowd of demigods roars with approval in response, indicating that thanks to Reyna, both Camp Half-Blood and Camp Jupiter have finally come to truly accept the son of Hades. Shortly before leaving Camp Half-Blood, Reyna promises Nico that he will always have a place in New Rome, and he promises to visit often.
Interestingly, three things that both Nico and Reyna have in common are them both fluently speaking a Romance language (Italian and Spanish respectively), their tendency to hold grudges (though Nico has improved in this regard considerably), and their unrequited feelings for Percy in the past, but have both managed to move on since then, while remaining good friends with the son of Poseidon.
It is unclear how he will react to her becoming a Hunter of Artemis, as he sees them as the reason his sister is dead.
Nico knows Dakota from Camp Jupiter and seem to be on good terms. Nico talks to the son of Bacchus in The Son of Neptune and Nico doesn’t mind when Dakota says that Reyna has no idea what to do with him. Nico makes Dakota blush when he compliments him for standing up for Nico. The two later go to discuss war strategies with Vitellius and Don.
In the The Blood of Olympus Dakota and Leila are the second people to find out about Jules-Albert, his French zombie driver. They bond over their hatred for Octavian. Dakota and Nico seem to trust each other, with Dakota listening to Nicos orders and Nico saying he counts on him. It is unknown how Nico will react to his death.
Apollo and Nico first meet in The Titan's Curse. Nico is excited and giddy around Apollo and asks him a lot of questions, while Apollo answers them and gets along with him fine. At the time, he sees Nico as a little kid.
Nico and Apollo seem to be on good terms, since he is the father of Will Solace, Nico's boyfriend. The two interact in The Hidden Oracle and Nico tells him of the whereabouts of the seven. Apollo sees the son of Hades as a capable fighter, and Apollo is supportive of his relationship with Will, even if he doesn’t know why he would be attracted to a Son of Hades.
Nico helps Apollo defeat Nero and the Colossus Neronis.
Nico meets Lou in The Blood of Olympus, and Lou is friendly around him and introduces him to Cecil Markowitz. Nico compliments Lou on throwing pig balls, making her blush. Lou and Cecil also watch Nico argue with Will Solace. They seem to trust each other and be on find terms, as they help defeat Octavian. Lou may be romantically attracted to Nico, as she blushes at him and acts flustered when she meets him. However, for obvious reasons, the feelings are probably not reciprocated.
Lou Ellen Blackstone introduces Nico to Cecil in The Blood of Olympus, and they help defeat Octavian. Cecil compliments Nico, saying he likes the way he thinks. Cecil seems to trust Nico, and listens to his command to sabotage the onagers. Nico trusts that he could do it, since he is a son of Hermes, and is happy when it succeeds.
When Cecil goes missing in The Hidden Oracle, Nico doesn’t outright mention him, but Nico is angry about the people being missing in general, so that probably includes Cecil.
Coach Hedge is very protective of Nico and in return, Nico respects him. Nico, Reyna, and Hedge helped the Athena Parthenos to Camp Half-Blood. Nico also called the coach his friend, which was a huge step for him, considering he thought he never had any friends. When Nico displays his horrifying show of rage, Hedge does not judge him, but thinks his rage was dangerous and dark, but Nico was surprised he didn’t care that the thought that. Hedge didn’t judge him when he found out he was gay either. Nico realises that now that he knew who he was inside, he cared more about him, instead of wanting to push him away. Nico saved Hedge’s life many times, like from Bryce Lawrence and Lycaon.
Hedge greatly cares about Nico’s well being and asked him how he can help him, and also cared for Nico in a shadow coma for three days, using woodland magic, and didn’t leave him behind because he was a part of the team. Later, when they returned to Camp Half-Blood, Hedge told Will about Nico overusing his powers, obviously concerned.
The two spent plenty of time together on the quest, including going shopping together at San Juan, buying matching shirts, and going to the Buford Zippy Mart. Nico is also very excited about his baby, and couldn’t help but smile with happiness when Will, Lou, and Cecil mention the baby’s birth.
|“||You’re my sister too. You deserve another chance. Come with me.||”|
–Nico to Hazel, in The Son of Neptune
In The Son of Neptune, Nico is shown to be very caring to Hazel Levesque, his half-sister, and tries to help her as much as he can. Nico occasionally mistakes her for Bianca, which often reminds Hazel that she isn't the one he was looking for when he entered the Fields of Asphodel. Despite this, the two care deeply for each other, and refer to each other as "brother" and "sister". Nico is one of the few people who know about Hazel's past and was the one who helped her during her blackouts, which shows that he loves his family, even his half-siblings.
The two represent the aspects of Hades and Pluto's realms respectively, as in Greece, Hades was known for death and in Rome, Pluto was known for his wealth. Hazel remarks that before she met Percy, Nico was the strongest demigod she had met even though the Romans thought he was harmless. Near the end of the book, Gaea informs Hazel that she has taken Nico and that he should not have gone looking for the Doors of Death.
In The Mark of Athena, when Jason and Leo express doubts about Nico's loyalty, she gets incredibly furious. She was also determined to go to Rome to save Nico despite knowing it could be a trap. After Nico is saved and she sees his broken state, Hazel tries her best to comfort him.
In The House of Hades, when Hazel is dying of poison, Nico goes as far as threaten a minor god to heal her, which results in him being turned into a plant. Later, he kisses Hazel on the cheek as if saying goodbye, to the surprise of Piper. After rescuing Hazel from a giant at the Doors of Death, Nico comes over and kisses her forehead and claims that Hazel 'would have made Dad proud', this sentimental compliment may have reminded Nico of his sister Bianca, who Hades initially considered better than him in every way. Hazel cups her hand around his face and smiles at him, showing they have a very close relationship. She thinks herself very lucky to have a brother like Nico. Still, even she knows nothing about Nico's love for Percy. In The Blood of Olympus, when Hades reveals to Nico that one of the Seven is destined to die, Nico's primary concern is for Hazel. At the end of the book, before Hazel and Frank depart for Camp Jupiter, Nico promises to visit them often.
|“||I love Nico—don't get me wrong—I just needed to find out what it would be like not to be a big sister twenty-four hours a day.||”|
–Bianca about Nico, in The Titan's Curse
Nico and Bianca shared a very close relationship. As their mother died when they were young, Bianca assumes an almost motherly role, bearing the responsibility that a parent would normally bear, shown when Nico stated Bianca is strict on the movies she lets him watch before he watched the Orientation Film. This is one of the reasons why Bianca joined the Hunters of Artemis. In The Titan's Curse, Bianca tells Percy that she wanted to know what it would be like to "not be a big sister for one day." Nico felt betrayed when this happened and managed to convince Percy to follow her and keep her safe for him. When Percy failed to do so, Nico was angered and claimed that he could feel her soul being judged, causing Percy to realize he is a son of Hades.
In The Battle of the Labyrinth, Nico is shown to be attempting to bring Bianca back to life through the exchange of a soul for another soul. In search for this soul, Nico meets Percy at Geryon's ranch. Percy tells him that Bianca has been sending him Iris Messages, which angers Nico, as she refuses to see him. Later, Bianca appears. She tells Nico to stop holding a grudge against Percy and it is she that Nico is angry at her, not Percy. Later in the book, Nico is seen talking to Bianca again.
She appears once in The Last Olympian, attempting to dissuade Nico from summoning their mother. Her warning goes unheeded.
In The Son of Neptune, it is mentioned that Nico goes searching for Bianca when Thanatos is kidnapped but finds that she has been given rebirth. Instead, he finds Hazel and brings her back to life.
In The House of Hades, when Jason discusses his revelation to Cupid, Nico angrily tells him that Bianca was the only one who accepted him. Whether this is referring to the fact that he feels like an outcast because he's a son of Hades or whether Bianca knew that Nico was gay is unclear.
|“||Nico and Bianca need their mother . . .||”|
Nico has no memories of his mother, which is why he is so eager to discover more information from Hades, who uses this to his advantage at times. He attempts to summon her, despite Bianca warning him that he should not.
In his attempt to summon his mother, he is presented a memory which discusses the terms of the agreement after World War II and how Hades defied it. Nico watches as Hades and Maria discuss how Hades can bring her to safety, though his offer of building her a palace is declined. He then sees Zeus destroy the hotel they were staying in in an attempt to kill him and Bianca.
|“||My son, whatever happens, you have earned my respect. You brought honor to our house.||”|
–Hades to Nico, in The Blood of Olympus
Nico and his father share a complicated relationship. They are both extremely similar, especially in their ability to hold grudges. Both of them are also somewhat cynical. However, Nico seems to have a stronger tie to his friends, while Hades seems to have a much darker view of his siblings. Nico is also a more genuine person than his father- Hades can be crafty, as seen from how he used Nico to attempt to trap Percy.
Hades occasionally remarks that it would've been better if Bianca survived, much to Nico's dismay, though deep down, he cares a great deal for his son, as his gaze softened "from steel to stone" when he saw him. He also wants to redeem himself in the Olympians' eyes through Nico, believing his son to be the demigod of the First Great Prophecy. Nico also appears to want to please his father, and beams with happiness when he gains Hades' respect after Kronos' defeat. At the same time, Nico is unafraid to challenge his father in order to do what Nico believes is right.
After the Battle of Manhattan, Hades begins trusting Nico with much more information, and even tells him about Camp Jupiter and the Roman demigods, trusting Nico not to share this knowledge with anybody else until the time is right. Hades might have foreseen that Nico was destined to find the Doors of Death and lead the Seven Heroes of Olympus there.
In The Blood of Olympus, Hades and Nico speak in Évora. Hades tells Nico that "some deaths cannot be prevented" which alluded to Octavian's death. Hades also praises Nico for his past accomplishments, letting him know that he is proud of his son, and that he wants Nico to be happy. Their relationship seems to have improved, since Hades' tone is described as "almost gentle" while he is taking to his son, while Nico (who usually dislikes being touched), feels reassured when his father briefly touches his shoulders. It is later revealed that Hades gave Nico a zombie chauffeur as a birthday present once, since he was trying to be more like normal mortal parents, who normally drive their children to places.
Nico and his stepmother Persephone mutually dislike each other, as he is a reminder of Hades' affair with Maria di Angelo, who Persephone is jealous of. This same dislike appears between Percy and Amphitrite, as well as Thalia and Hera. Persephone appears to take it to another level through turning Nico into a dandelion as stated by him in The Demigod Files when Percy, Thalia, and he ended up in the Underworld together.
In The Mark of Athena, it is revealed that Nico carries around some pomegranate seeds from Persephone's garden in case of an emergency, and so uses them when he is trapped by the twin giants. It is unknown how Persephone feels about Nico using an item from her personal garden, or if she is aware at all.
Shortly after Nico initially ran away from Camp Half-Blood, he was found in the Labyrinth by the ghost of King Minos, who intended to manipulate the son of Hades into killing Daedalus in revenge for his unjust, however much deserved, death. In order to gain Nico's trust, Minos leads him through the maze of the Labyrinth, saved him multiple times, and taught him how to utilize the infernal demigod powers he got from his father. It is most likely that Minos was also the one to teach Nico to shadow travel. In the end, however, Nico realized Minos' malevolent goals, and banished him back to the Underworld, stripping him of his Ghost King title, and taking it for himself.
Years later, in The Blood of Olympus, Nico has several flashbacks of Minos in his dreams. It is also revealed that Nico's experience with Minos made him realize that most specters held only as much power as one allows them to. Hence, the son of Hades has learned to shield himself from specters' influence, and can even turn the tables now, bending them to his will.
|“||Some dogs need to be put down, like you!||”|
As seen in The Son of Neptune, Octavian, much like most others at Camp Jupiter, thinks of Nico as just a somewhat creepy traveling outcast, considering the Ambassador of Pluto to be as harmless as a Faun. However, Octavian does grow suspicious when Nico seems to know about Alcyoneus in the meeting.
By The Blood of Olympus, Nico comes to absolutely despise the self-proclaimed Pontifex Maximus (to the point that his throat "constricted with hate" while just thinking about Octavian), and even considers personally assassinating Octavian without any qualms. Nico notes how different Octavian is from his love interest Will Solace, and describes the former as looking like a watered-down, unhealthy version of Will, without anything in him that makes a child of Apollo special. Octavian, on the other hand, seems to have finally come to appreciate what a powerful ally Nico could potentially be for him, as he claims to see a decent amount of ruthlessness in the son of Hades, which he also greatly appreciates. Hence, Octavian promptly attempts to sway the son of Hades to his side, arguing that the Greeks hadn't ever actually done anything for the former. Octavian claims that he can beat any offer the Greeks might have given Nico, and assures him a place in New Rome in return for Nico siding with him and allowing the Romans to win. Nico, however, does't even consider the offer, declines right away, and promptly tells all of the assembled demigods to listen to what Reyna has to say, just as she arrives with the Athena Parthenos in tow. Nico is later present when Octavian intends to shoot an onager at Gaea, and clearly sees that doing so will result in Octavian's death. However, it is at that moment that Nico recalls what his father Hades had told him, about some deaths that cannot and should not be prevented, and Nico needing to act when the time comes. Hence, for the first time, Nico decides to trust the wisdom of his father, and stops Will (who stares at him in disbelief) from trying to prevent Octavian's plan, and subsequently witnesses the augur's horrific fiery demise, along with the death of Leo and destruction of Gaea. While Nico isn't at all saddened by Octavian's death, he is very guilt-ridden, since Nico feels that him choosing not to prevent Octavian's death unnecessarily cost Leo his life, something that he is unable to forgive himself for. Nico is also horrified of Will now possibly thinking of him as a monster for letting Octavian die, but is extremely relieved to learn of that not being the case.
After the Titan Iapetus lost his memory, Nico would visit him at his father's palace. The son of Hades managed to convince Bob (Iapetus) that Percy was a good person, which would eventually lead to the Titan helping Percy and Annabeth reach the Doors of Death from inside Tartarus.
Nico does not care for Artemis' immortal handmaidens, since his sister died shortly after joining. He feels that the girls who do join should be more aware of what they are getting themselves into, as well as just forgetting about his sister when she died shortly after joining. When he awoke in San Juan and saw the note they left, he tore it up in a fit of rage. Despite fighting alongside Thalia before, he still has mixed feelings for her, mainly because she is the lieutenant of Artemis, and continued recruiting after Bianca died.
- The name Nico is the diminutive form of Nicolò or Nicola, the Italian form of the Greek Nikolaos (Nicholas), meaning "victory of the people." It is most likely intended to evoke the prefix necro-, meaning dead.
- With his surname di Angelo being Italian for "of the angels".
- The full meaning of his name would thus be "angel of the dead", alluding to his role as the Lord of the Dead's son.
- Nico is also a form of the Greek Nike, meaning "victory".
- The line "With great power . . . comes great need to take a nap." is an obvious reference to one of Spider-Man's most famous lines: "With great power, comes great responsibility", albeit a bit altered for comedic effect and to indicate that Nico's powers tire him greatly, prompting him to take naps every now and again to regain his strength, as he did at that moment in The Last Olympian.
- Nico has many similarities to Anubis, the Egyptian god of funerals.
- They share the same nickname: "Death Boy".
- Nico's physical description (pale olive skin, dark hair, brown eyes, black clothes, and an aura of death) also fits Rick Riordan's description of Anubis, the Egyptian god of funerals, in The Kane Chronicles trilogy.
- The first time he met Mr. D, he called him "The Wine Dude", which irritated the god, but he forgot about it soon after as Nico complimented him.
- Nico has been shown to be a solitary type of person, but he has a certain way of communicating with people. He was the first demigod in years to notice the goddess Hestia and speak with her, he persuaded his father Hades to fight in the Titan War when no one else could, and he alone convinced the Titan Bob to save Percy and Annabeth.
- Nico has been to a New Orleans graveyard, though it is unknown why he went. Interestingly, this is one of the favorite hangouts of Anubis. It was also the place that his half-sister Hazel Levesque lived just before her death.
- Nico and Jason Grace have similarities:
- They both have older sisters, whom have both been/are Hunters of Artemis.
- They have both been to Camp Half-Blood and Camp Jupiter.
- They have godly stepmothers (Persephone, Juno).
- Both have lost their memory. Nico's because of being dipped in the River Lethe and Jason's was removed by Juno (though Jason's is temporary; in The House of Hades he seems to be recovering from his amnesia, much like Iapetus).
- Hazel Levesque and Nico's mothers share similar first names: Marie Levesque and Maria di Angelo.
- Nico's birthday is undecided. Rick Riordan has stated on two different occasions his birth-date: January 28th, 1924 and May 16th, 1924. However, the year would be way off since in The Son of Neptune, Hazel stated he was only a few years younger than her. Another contradiction comes from The House of Hades where in Nico mentioned that he was about six years old when he first visited Diocletian's private residence in "[nineteen] thirty-eight or so". This would put his date of birth at around the early 1930's.
- In the series, he is described as having long, shaggy black hair, but in his earlier portrait he has short brown hair. Also, he seems to have green eyes instead of brown, and not as pale of skin. A more recent portrait shows a more accurate image of him to the story.
- He is the only child of the Big Three to never have gone on an official quest in either series.
- Unlike his half sister Hazel, horses don't like Nico (as Porkpie, one of Blackjack's friend once stated: "He smells like dead people.")
- Most animals don't like Nico due to him smelling like death, and the feeling is often mutual.
- Nico speaks fluent Italian, as he is Italian by birth. (It should be noted, however, that he had his memory wiped in the River Lethe. It is possible, though, that he picked up the language sometime between The Last Olympian and The Son of Neptune.)
- Nico has the ability to control ghosts. However, Melinoe is the goddess of ghosts, not Hades.
- Prior to Camp Half-Blood Confidential, Nico was supposedly the only person who had ever seen Camp Half-Blood's Orientation Film. Unlike the others, for which the film was "traumatizing", Nico enjoyed it, calling it "awesome." (Also noting in Camp Half-Blood Confidential, his decision has changed as he was discussing with Percy what changes they would make if they ran the camp and he mentioned ‘the first thing I’d do is make sure the poor newbie demigods don’t have to suffer through the orientation film.’)
- As of The Last Olympian, Nico is the first demigod in many years known to have stopped by and spoken to Hestia, who is usually ignored when she visits Camp Half-Blood.
- As of The Son of Neptune, Nico is the first known Greek demigod since the First Demigod Civil War to learn about the existence of Roman demigods and to visit Camp Jupiter.
- Nico is the only known Senator at Camp Jupiter that was neither a Centurion nor a Praetor, instead serving as the Ambassador of Pluto.
- As of The Mark of Athena, Nico is the first known demigod ever to have returned from Tartarus alive, but even as a son of Hades, his stay in Tartarus left him shattered, irascible, and even more withdrawn than usual.
- Percy speculates when on the verge of death and seeing Tartarus as it really is, that Nico had seen it that way the whole time, and that even a few moments of seeing, it was maddening. He wonders how Nico had survived with his sanity. Nico himself stated it nearly drove him insane.
- As of The House of Hades, Nico is the only known demigod that Leo, Frank, and Jason are afraid of.
- Nico has been transformed into plants twice in the series: into a dandelion by Persephone during a "family spat" shortly before the The Demigod Files, and into a corn plant by Triptolemus in The House of Hades.
- Nico is the first confirmed LGBT demigod (with Will Solace and Alex Fierro being later confirmed to be as well, in The Hidden Oracle and The Hammer of Thor respectively), something he has been trying to hide for years. The only blatant clue is in The Titan's Curse, when he asks Percy if Annabeth is his girlfriend. Jason believes that Nico's hiding of this has to do with Nico being from the 1940s, where homosexuality wasn't accepted.
- Hence, as of The Hidden Oracle, Nico and Will are the first gay couple shown in the series.
- As of The Blood of Olympus, Nico is the only known hypnokinesis user that is not a child of Hypnos.
- In both the Percy Jackson and the Olympians and the The Heroes of Olympus series, Nico ensures the fulfillment of the Great Prophecies: Nico helps Percy gain the Curse of Achilles, which enables both Percy and Luke to defeat Kronos ("the hero's soul cursed blade shall reap"), and Nico tells Iapetus that Percy is a friend, which induces him to follow Percy and Annabeth to the Doors of Death ("foes bear arms to the Doors of Death").
- Hades once gave Nico a French zombie chauffeur, Jules-Albert, for his birthday.
- When he was little (even before he became interested in Mythomagic), Nico was obsessed with pirates.
- In The Titan's Curse, Nico is ten and Percy is fourteen. There is a four-year age difference. In The Hidden Oracle, Nico is fourteen and Percy is seventeen, turning eighteen in August.
- Nico is mentioned in the Lightning Thief Musical by Bianca Di Angelo.