|“||That’s the irony. I can ‘look’ like whatever or whoever I want. But my actual gender? No. I can’t change it. It’s truly fluid, in the sense that I don’t control it. Most of the time, I identify as female, but sometimes I have very ‘male’ days.||”|
–Alex describing her gender fluidity to Magnus in , The Hammer of Thor.
Alex Fierro is a genderfluid, formerly homeless teenager from Boston, Massachusetts. She is the Norse demigod child of the god Loki (in a female form) and Mr. Fierro, a mortal businessman. Due to Alex‘s gender identity and being the child of a Norse deity, she was constantly berated, harassed, and assaulted by others and eventually disowned by her family. After dying and being chosen to become an einherji by his half-sister, Samirah al-Abbas, Alex is now the newest named resident of the Hotel Valhalla and a hallmate to Magnus Chase and the other occupants of their section of Floor Nineteen. Alex is currently the significant other of Magnus Chase.
The Fierro family is influential, which was what first attracted Loki's attention, causing the trickster to seduce Alex's father, a married businessman, in the form of a "voluptuous red-head" and tricked him into having an affair with the trickster in his female form.
Nine months later, Loki returned and left him with their child. The family didn't take the news well, especially after Loki permanently "opened their eyes" and made them aware of the Nine Worlds and the Norse gods.
Alex spent her life being resented for both her Norse heritage and her gender fluidity, which was thought to be Loki's fault. She would be bullied, both verbally and physically, by her classmates and berated by her father while her mortal step-mother did nothing to prevent this domestic abuse. The only person to accept Alex was her paternal grandfather, and he taught her how to make pottery.
He was involved in a pottery studio at one point and went camping with them often, the owners would even let Alex stay at the studio overnight when things were bad at home for the child of Loki.
Disowned by Family and Life on the Streets
About two years before becoming an einherji, Alex became homeless when his father, literally, kicked him out of the house and the child of Loki began to wander the streets of Boston. Alex would often get assaulted at shelters.
At some point in life, he lived in a youth shelter on Winter Street in Boston, at roughly the same time when Magnus was there. He remembers hating the place. Also during this time, Alex befriended a boy named Adrian, but he would end up killing himself.
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Alex Fierro is first indirectly mentioned by Samirah, as the latter receives a message about a potential code three-eight-one: heroic death in progress. This prompts her to run out of a meeting with Magnus and an informant (which turns out to be Otis). Samirah initially refers to Alex as her brother, implying that he was male when he died.
After Magnus comes back to Hotel Valhalla, Hunding mentions that a newly arrived "monster" attacked him, after being shown her new room, which completely fouled Helgi the manager's mood. Hunding is also the first one to call Alex an argr. When Magnus arrives at the Nineteenth Floor, Alex – in the form of a cheetah and chased by the rest of the residents – charges at him, promptly knocking him back and puncturing several holes in his sneakers. It is revealed that she has been given X's old room and isn't exactly happy about it, leaving the place in ruins. When the group explores the room, they find broken pieces of ceramics, all decorated with the symbol of Loki – two snakes curled up in an elaborate S pattern.
Alex finally makes his full appearance during a combat exercise. As a weasel, she is carried in a burlap sack by one of Odin's ravens. After returning to her human form, she states that she's calmed down already and will not try to "mess anyone up". As the combat starts, and the dragons are released, Alex accompanies the rest of the Nineteenth Floor, and is asked about the shelter on Winter Street by Magnus. She explains that having been in the same shelter does not make them friends, as the group is attacked by an eldered Grimwolf. Alex deduces that it was Loki that somehow unleashed the monster inside Valhalla, and she attacks the dragon along with the group. As Magnus is distracted by a splinter of Loki's consciousness, Alex kills the dragon with her steel wire. Later on, Loki is seen channeling his energy through Magnus, which will kill him and subsequently blow up quarter of the training ground. Seeing no other option, Alex decapitates Magnus with her garrote.
Alex is later seen sitting next to Sam at the Thanes' table, waiting for her final moments to be revealed. Neither she nor Sam are very comfortable with the Valkyrie Vision video: it started to record much earlier than Samirah intended, and it shows Samirah's embarrassing conversation with her grandparents and the Fadlans. The action moves to Alex, saving an older man from wolves – sons of Fenris. The man, a Norse demigod in denial, refuses to fight and leaves Alex alone, which results in the latter's death. Alex is then chosen by Samirah and brought to Hotel Valhalla. The video leaves the thanes and the einherjar in awe. They applaud to Alex for her bravery, and accept her into Valhalla, despite her being both a child of Loki and an argr. Later, Magnus sees Alex accompanied by the people from the Nineteenth Floor, as he talks with Sam. During their discussion, Sam reveals that Alex was initially very hostile when rescued as he thought that becoming an einherjar would restrict him to a single gender.
Alex, now male, is later seen with Halfborn Gunderson as they accompany Samirah and Amir Fadlan. Due to Loki's schemes, Sam's grandparents and the Fadlan family have learned about the Norse gods and their connection to Sam, so Sam attempts to show Amir the Bifrost Bridge to better his understanding of their world. As her half-brother, Alex volunteers to be a chaperone to Sam, and he himself is chaperoned by Halfborn. After Amir is shown the Bridge, all of them are invited to meet Heimdall, but Halfborn decides to stay behind. During the meeting, Alex lies on the Bridge and makes "light angels". After learning about the location of Thor's hammer, Heimdall drops all of them off next to the Fadlans' restaurant. Alex joins Magnus, Sam and Amir for dinner as they discuss the consequences of Sam's grandparents learning about the Nine Worlds. Later, Magnus and Alex get back to Hotel Valhalla, but not before Alex wisely asks for a doggie bag to pack up the leftover falafel.
The next morning, they visit Randolph's house in Midgard to look for clues that might lead them to Thrym. Magnus and Alex, currently female, engage in a conversation regarding Alex's gender fluidity, and Alex explains to Magnus that the word she does not identify as not like to be referred to using they/them pronouns. Soon after, they find a photo of Bridal Veil Falls, which they believe is where Sam is about to get married. Magnus and Alex regroup with Sam, Hearth, and Blitz soon afterwards. With the aid of Stanley, the two travel to Jotunheim along with Blitz, where they aim to find Utgard-Loki. After an encounter with a giant called Tiny, whose colossal bag they must carry, Alex tells Magnus about the circumstances of her birth.
When Blitzen has altered the bag to shrink down to normal size, the trio head to Utgard-Loki's palace, where they reunite with Sam and Hearth. Alex and Magnus are tasked with defeating a pair of giants at bowling, in a contest at Utgard Lanes. However, the giants cast an illusion (I wonder if anybody will see this) on the lane of the einherjar, making their bowling balls travel through a portal that connects to Midgard's White Mountains. The giant duo roll two perfect frames, while Magnus and Alex's own rolls cannot connect with the pins. During their final frame, Alex joins hands with Magnus to dispel the illusory portal together. Magnus bowls a perfect frame, while for their frame Alex shapeshifts into an elephant and knocks over all the pins. They subsequently win the contest.
After Utgard-Loki gives them the information they need to retrieve Thor’s hammer, the group is chased by Utgard-Loki’s giants but are almost immediately saved by the goddess Sif, wife of Thor. Sif teleports them to their home in Asgard where Thor also resides via Yggdrasil, and presents Hearth with a bag of runes as a gift. As she rides the elevator with her friends to Thor’s “man-cave”, Alex expresses her initial dislike for Sif, and agrees with Samirah when the latter says that the goddess is both dense and vain. Later, after discussing the retrieval of Mjolnir with Thor, Alex offers to pretend to be Thrym's bride in Samirah’s place, due to the oath of marriage that Sam swore with Amir on the Bifrost as well as her confidence in her ability to be immune to Loki’s powers. When Thor argues that she is an argr and not a “proper girl”, Alex retorts that she is gender fluid and well suited for the task.
The next morning, Alex is dressed in preparation for her “wedding” by Sif, after which her opinion of the goddess changes. Sif also warms to Alex. After the goddess Sif gets Alex dressed and they come out, Magnus is left awestruck seeing Alex as she looks beautiful. Magnus and Sam also get ready for the wedding as the chaperone and the bridesmaid, and Alex teased Magnus about his costume. After that, Sif opens them a portal to Taco Bell where Thor's chariot is waiting.
The trio arrives at Thrym's home, where the giants hold a wedding feast. After the feast, since the father of the bride must be present, the giants tunnel down into the cavern where Loki is held prisoner. Alex manages to keep up the act throughout the ceremony. When Loki asks Randolph to cut his binds with the Skofnung Sword, Alex reveals herself and attacks Thrym, while Magnus and Samirah take on the rest of the giants. They eventually defeat the giants – with help arriving in the form of Thor, Blitzen, Hearthstone, Mallory Keen, Halfborn Gunderson, and T.J. – but Loki escapes. Alex later tells Magnus that Loki, during the fight, willed her to die.
Back at Hotel Valhalla, Alex offers to help Samirah learn to resist Loki's control, but she refuses, to Alex’s hurt. She, Samirah, Magnus, Blitzen, and Hearthstone are tasked by Helgi, on Odin's raven's orders, to recapture Loki. Alex then storms off to her room, where she begins working on a clay trophy as a gift for Sif. The next morning, Magnus pays a visit to Alex, now male. He admits that Sam can resist Loki's power by accepting shape shifting and using it as frequently as Alex does. By the end of their conversation, Alex has shifted to female, and Magnus knows before he is told. Alex throws a piece of pottery she had made the night before at him as he walks out.
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Alex helps Magnus train at Boston Harbor for his coming quest to re-imprison Loki. He is with Annabeth watching Percy train the son of Frey and takes him back to Valhalla whenever he gets a fatal injury. The four have lunch and they talk about their plan to stop Loki. Alex says they should have set sail already and if they are to make it they should set sail by the end of the week. After the Greek demigods leave, he and Magnus head to the Chase Mansion.
When they arrive they find the doors blown in and a wolf corpse in the foyer. They explore the mansion and look to see if Randolph had a plan to take our Loki. When they reach the library on the top floor he sees a wolf on the roof and calls Magnus over. The decide to let the wolf in and see if it is looking for the same thing as them. He turns into a wolf and stares down the wolf before it takes a drinking horn by the fire place. Alex decapitates it and they find a journal in it. They decider it on the roof as a plan to defeat Loki. Alex mentions that her training with Sam to block out Loki is not going well and that something is going on with her but he will not tell. A raven delivers a message from T.J. saying they are about to set sail. Alex turns into a flamingo and flies of to get Sam.
He and Sam are picked up by the crew and set sail to pick up Blitz and Hearth. Soon after they leave they are dragged under water by nine women coming out of the water. They surface in a soup pot and are fished out by Aegir. He grants them guest rights and invites them for a meal, which consists of Blitz and Hearth. He states that he cannot eat dwarves and elves so Aegir releases them. He and Sam devise a plan. Just as they are about to eat, one of Aegir's daughters calls out Magnus. During a standoff between Aegir and the crew of the Big Banana. He signs to Magnus about talking to Aegir about mead. When their host agrees to let them go if they can escape he leaves and his daughters attack. During the fight he takes the form of a silver back gorilla. He helps out Magnus and Sam before Njord appears and allows Hearthstone to take out a wall so they could escape. When they surface Alex has changed gender and lets everyone know. She goes bellow deck to get food while Njord talks with Magnus, Blitz and Hearth.
A few days later she wakes Magnus to help out with Sam's training. At first she shouts the animal she wants Sam to turn into before having her half-sister face of against both Magnus and Jack. They stop after a while and she and Sam have a side conversation. She shakes Magnus awake when they arrive at York.
She, Magnus and T.J. go ashore while Mallory, Halfborn and Sam watch the boat. They run into Hrungnir and he challenges them to a contest at dawn. When he leads Alex searches desperately for a pottery studio. She rents one out for the day with money she wired from her family. She puts T.J. and Magnus to work and she handles the potter's wheel. She tells Magnus about her family history and her relationships with her father and grandfather. She tells Magnus to call Sam and update her on their current events. They have dinner at a fish and chips restaurant and return to the pottery studio for the night. She takes the chair while Magnus and T.J. make makeshift beds in the back. In the morning she brings her clay warrior, Pottery Barn, to life and they head out to face Hrungnir. The meet the jotnar in King's Sqare and he fight begins. She pulls Potter Barn out of Hrungnir's clay warrior and is immediately engulfed by the clay being. She is healed by Magnus and thanks Pottery Barn when they are defeated. When T.J. defeats Hrungnir the giant tells tells them the mead is heavily guarded in Flåm, Norway. After T.J. stabs the giant in the heart it explodes and they head back to the big banana. The three return to the ship and head for Norway.
When Magnus, Hearth and Blitz return they tell them about their time in Alfheim. The crew is concerned about Magnus, but Mallory eases their worry. They arrive in Flåm and dock the ship. She goes with T.J. and Halfborn in one direction to find the train station while Magnus, Sam and Mallory go in another. She and the other take on Baugi and are impressed that Halfborn was able to take out the giant on his own, with Alex deheading him. They set sail and reach Jotunheim by morning.
The big banana gets stuck in ice and she turns into a walrus and pushes. They decide to walk to shore and huddle in groups to keep warm. She is paired with Magnus. When they are close to shore she kisses him. Skakdi arrives and invites them in to explain themselves. They wash up and have a meal with the giantess. She tells the Loki is near and he will launch Naglfar by midday the following day. She lets them stay the night and will send them away in the morning. She is woken up in the morning and after breakfast they get ready to ski over to Naglfar.
They arrive and she and Sam go with Magnus while everyone else creates a diversion. Magnus turns them invisible with the Othela rune Hearth gave him and they move forward. She hears the voices of her grandfather and Adrian, a friend of hers who committed suicide. The three arrive at the ship and board. After the distraction goes of the set out to find Loki. When the rune wears off she uses her shape shifting to fight the enemy hoards with Sam. Loki then appears and declines Magnus's offer to flyt. After her mother grudgingly accepts she and Sam go over to their friends and watch Magnus flyt the trickster. She is concerned and angry that he will lose. Alex is startled by Magnus's complement towards her about all her good deeds and blocks her mother's escape while Mallory imprisons him. They make a break and fend of the enemy forces and jump off the ship at Sam's request. They land on the backs of water horses and ride away just as the harbor freezes over.
They spend three days at sea, during that time she is taught by Blitz how to make chain mail clothing. She tells Magnus she was startled by his revelation about their kiss outside Skadi's fortress and needs her space. The Big Banana takes them to Vigridr, where they will die during Ragnarok, and are greeted by the gods. She is welcomed back by Sif and they go to the feasting tent and have a meal while they hand over Loki. They are given autographed copes of Odin's autobiography, a feast in their honor and Turkish bathrobes. They arrive back at Valhalla and Alex, now male, goes with Sam and Amir to dinner with their families. He returns to the hotel and goes to Magnus's room. He kisses the son of Frey and tells him he is on board with his idea.
After Magnus turns his ancestral home into a shelter for homeless youths, she helps him manage the place. During the Fourth of July, Alex, now female, and Magnus hold hands and watch the fire works while they value the present.
This Is Why I Hate Clothes Shopping
Alex, male, goes to Blitzen’s Best to look for Amir Fadlan at his half-sister’s urging. He is greeted by Stan and told Amir is not there. He calls Amir and hears his phone ring. As Amir is about to be taken by the sorcerer he and Sam corner the two. He cuts the Nábrók off Amir while Sam apprehends Stan.
Well, That Was a Suprise
Alex, male, brings Halfborn Gunderson broken shards of pottery to complete a mosaic he is making for Mallory Keen. He asks Alex to keep watch while he goes to Vanaheim to get dragon scales. Alex agrees to this.
I Play with Fire
While Halfborn and Mallory kiss, Alex returns to his room and becomes female along the way. When she arrives Jack, who is staying with her while Magnus visits his cousin, tells her that he heard Surt is planning something. She tells Jack to come with her, but he says he must stay due to him being destined to be wielded by Surt during Ragnarok. She goes to recruit the others. Jack says Surt will detect them, but on the other hand, her shapeshifting and genderfluidity with make it harder to be spotted if she keeps changing shape. When thinking of ways not to be burned in Muspellheim, she decides to magically using fibers from her kilm, the Ures-Intertwining snakes of Loki, and a ‘borrowed‘ algiz shield rune from Hearth to successfully create a fire-proof coating that changes shape with her and takes the elevator to Muspelheim.
When she arrives she takes the form of an ant before turning into a horsefly. She finds Surt trying to recruit lesser known gods to join him and aid in reconstruction after Ragnarok. The gods stake there names and domains of power. Surt nearly senses her but becomes distracted by the others watching Thor running through lava. Alex turns into a cockroach and later a gnat to spread doubt among the minor gods. When it looks like they doubt him, Surt summons his fire sword and controls them through fear. Alex then turn into a human and uses her garrote to slice off Surt’s nose and wrap it around his neck and disarm him. After giving a speech of how even though the Einharjar are going to die come Ragnarok they will fight to the end, the gods vanish. Just then Sam, Blitz, Hearth, T.J., Halfborn and Mallory arrive it see Alex standing over the bested fire lord. Blitz hogties Surt with a rope and Alex claims his sword as her own before leaving.
Alex is a teenage einherji, and shares a lot of physical traits with her mother Loki. She is petite, as stated in the Hammer of Thor, with sharp and beautiful facial features and the same sly grin as the god of lies. She has heterochromia, with one dark brown and one pale amber eye, and her hair is dark at the roots but dyed green. She also has a tiny symbol of Loki tattooed on her nape. Magnus noted that Alex's physical appearance did not change when she was a boy, except for her hair, which actually seemed to be longer.
Alex dresses rather flashily and flamboyantly, in primarily pink and green. She wears a pink-and-green argyle sweater-vest over a white tee, skinny lime green jeans, and battered rose high-tops. Tied around her waist like a kilt is a cashmere sweater, which conceals a garrote wire and a hunting knife tucked behind a belt. Her appearance has been compared to both a jester's motley and a venomous animal giving off warning signs.
Magnus notices that she looks exactly like Loki except for the lack of scarred lips and acid burns on her nose.
Alex Fierro was extremely angry and volatile when she first came to Hotel Valhalla, and threatened to kill people. She lashed out at everyone on Floor 19, including Magnus, and didn’t trust him or the others. However, deep down, Alex was severely traumatized from everything that happened to her in the past, and was angry for dying. She eventually learned to trust Magnus, Sam, and the others on Floor 19. In The Ship of the Dead, she was a lot more silly and goofy, teasing everyone and acting more outgoing and flamboyant. She also valued her friendships greatly.
Unlike Sam, Alex is obsessed with change, and is proud of her shapeshifting powers because she can change. Alex has a tattoo of a snake on her neck, that symbolizes change. Alex tends to act differently from one moment to the next with no particular motivation, especially to Magnus, going from a normal teasing friend to very flirty. Alex also wears a lot of outfits. Her feelings towards someone can change very quickly, like to Sif, when she went from hating her to valuing her as a friend.
Alex likes to tease people, especially Amir, when he is his male chaperone, and to Magnus. Alex teases Magnus a lot and cut his hair with a garrotté wire many times. However, Alex shows empathy sometimes, and truly cares about her friends and takes great risks for them. Alex can also be very angry, and tends to throw things at people when mad.
Alex tends to hide her feelings from other people, and does not talk about her past readily. She didn’t want Magnus healing her after she cut herself because he didn’t want him to see what she had been through. After Magnus saw her painful memories, she was nearly reduced to tears. She also never told him about her nightmares from Loki.
Alex loves him/herself, from what we know of, and hates when people don’t accept her for being genderfluid and trans, after all of the bullying and abuse she was subjected to because of that. She hates when people don’t respect her pronouns or call her an argr, and has lectured people about that term. Alex views herself as the same as everyone else, as she told her father in their last conversation, but likes to flaunt her weirdness. Her Abuelo also taught her to be proud of her Mexican heritage.
Alex really likes fashion and pottery. She likes stealing things, and she stole international currency from her father before going on the Big Banana.
- Pottery: In her room, Alex has a pottery wheel, which she uses to make clay vases. Each of her creations is branded with her initials and the symbol of Loki.
- Fashion Sense: Mallory Keen commended Alex on her choice of fashion, which included a dark green Stella McCartney dress and a tuxedo jacket.
- Camping Skills: Alex has spent many weekends with the kids at her pottery studio, camping in the woods as a way of getting away. These skills were displayed when she helped Magnus set up a fire pyramid and some pup tents.
- Shapeshifting: Just like her half-sister, Samirah, Alex has demonstrated her mother's ability to change forms. When she first arrived at Hotel Valhalla, she panicked and turned into a cheetah. When one of Odin's ravens captured her, she was a brown-and-white weasel. While saving a demigod in denial, moments before his death, he fought off the sons of Fenris as a German Shepherd. She also shapeshifted into Samirah when she was taken to Loki's cavern for her marriage with Thrym.
- Resistance to Loki's influence: As a side effect of using her shapeshifting powers so often, she is able to resist the power of her mother's influence on her body. As stated in in his room in Valhalla, he can do this is because he is comfortable changing; he has made his mother's power his own.
- Mystiokinesis: As a son/daughter of Loki, Alex can use magic.
- Enhanced Physical Abilities: After gaining a new einherji body, Alex's natural abilities greatly increased, making her stronger, faster, more durable and more agile than he originally was.
- Einherji Immortality: While within Hotel Valhalla, Alex, like any of the einherjar, cannot die, and will simply keep resurrecting from mortal wounds.
- Enchanted Garrote Wire: Alex uses her garrote wire, which she created after Loki taught her a spell, and uses it as her primary weapon.
- Fire Sword: After besting Surt, Alex claims his sword as her own.
- Pottery Barn: Pottery Barn is a clay warrior created by the child of Loki to fight against Hrungnir and his clay creation. They were destroyed during the battle and Alex kept their head.
When they first met, Alex (as a cheetah) ran over Magnus' feet trying to escape the hotel. When Magnus first saw Alex as a human, Magnus was immediately attracted to her and gawked at her, though initially confused when he found out that she was gender fluid. Alex later decapitated him on the battlefield, saving him from Loki.
Throughout the Hammer of Thor, Magnus has a crush on Alex, but refuses to admit it, and stared at her on multiple occasions. Alex, in return, warms up to Magnus and talks to him about her being gender fluid, and being homeless. The two also hold hands multiple times in the novel, and Alex wraps her hands around Magnus when they ride Stanley. At the end of the book, the two are very close.
In The Ship of the Dead, the two spend most of their time together and train with Percy and Annabeth. Alex teases Magnus mercilessly making Magnus self conscious, but the two care for each other. The two go to the Chase Mansion together and fight wolves, look for artifacts, and drink guava juice together.
On the Big Banana, the two flirt a lot. When Njord visits and talks about his feet, Magnus thinks about Alex’s feet. That night, when he dreams, he dreams of Alex being kicked out by her father and Magnus wants to protect her, and Alex also wakes him up. Later, Magnus, Alex, and T.J go to York to fight the giants, and Magnus and Alex talk about Alex’s heritage and Magnus tells her that he admires her, confusing Alex. Later, Magnus heals Alex and sees that one of her memories is looking at Magnus, confusing Magnus.
The Big Banana goes through Niflheim later, and Magnus and Alex cuddle together while walking, while Alex talks about happy memories together, and Magnus notes how skinny she is and how he wants her to eat more. Alex then surprises Magnus by kissing him on the lips, telling him that she wanted to do that before she died. Alex doesn’t mention it later, confusing Magnus.
The next day, they go to meet Loki, and Magnus almost goes into Helheim, but’s Alex’s holds his hand and comforts him, telling him that he can’t go see them, and that she saw her dead grandfathers and friend. Sam is very happy with them holding hands, and Magnus says that he can hear Sam smiling. At the flyting with Loki, Magnus tells Loki the happy memories that he had with Alex, and that their kiss was the best thing that ever happened to him. Alex later tells Magnus that she needs time to think before she can be his boyfriend.
At Vigridr, Magnus gets sad when thinking about how Alex will die there. When they get back to Valhalla, Magnus, shirtless, sees Alex and Alex (male) tells him about Eid, and tells him that he is thinking about his declaration of love. Before Magnus can say anything, Alex kisses him on the lips and tells him that he is still thinking about it, and to go take a shower. Alex hums Frank Sinatra when he leaves. Magnus thinks about how he just kissed a dude, but immediately thinks that he kissed Alex, and that he is great with that.
On the Fourth of July, the two hold hands on the roof of the Chase Mansion, and Alex says that this is nice, and Magnus agrees.
In 9 from the Nine Worlds, Alex sees Halfborn and Mallory making out, and Alex notes that seeing them makes him almost miss Magnus.
Alex first meets Halfborn in cheetah form running down the hallways of Valhalla. Alex threw a vase at Halfborn and insulted him when he and the others visited his room. Halfborn is angry about it, and calls him a meinfretr to Magnus, the Norse equivalent of cheese fart. Halfborn complimented the vase he threw at him later to Magnus, saying that it was beautiful and how he made good quality stuff. Halfborn is aware that Alex is genderfluid and makes jokes about it when Magnus sees that Alex has shirts and dresses and wondering if he had a sister. Halfborn meets Alex again and he formally introduced himself, saying he won’t kill him unless he has to. Halfborn later thinks that Alex was a spy for Loki, and that he can’t trust an Argr (a term that means unmanly) in combat, and that argrs aren’t warriors, angering Mallory. Halfborn also teased Magnus for staring at Alex, saying that there is no shame in being attracted.
Later in the book, Halfborn and Alex became friends, with Alex killing him in battle and getting him back at lunch. The two later sat on a roof together, with Alex chaperoning Sam and Amir, and Halfborn chaperoning Alex. The two trash talked each other, with Halfborn calling him an argr and Alex punching him back. Alex also lectured him about the term argr many times while Magnus was gone.
In 9 from the Nine Worlds, Halfborn took Alex to his arts and crafts room, impressing Alex. Alex brought Halfborn shards of broken pottery to make a Vanir dragon collage for Mallory, and called him a romantic after he clucked him under his chin. Alex guarded Halfborn’s door to make sure Mallory didn’t get in, so his surprise wouldn’t be ruined. Alex later complimented Halfborn and Mallory, saying that they were so cute together it made him sick. Later, when Alex was in Muspellheim facing Surt, Halfborn came to help her with the others. Alex was also happy when Halfborn realized that she was female.
Mallory and Alex met when she welcomed Alex to Valhalla with Thomas Jefferson Jr. and Halfborn Gunderson. Alex was not happy to meet her and threw insults at them, angering Mallory, making her afraid that she would destroy the hotel, calling him a demon. Alex and Mallory later met formerly, and Alex promised not to kill her unless she had to. Mallory was also the most confused when Alex said that he was a she, and almost started arguing, and was angry when Alex and Magnus stood in the battlefield chatting instead of fighting. At dinner, Mallory was very suspicious that Alex was a spy sent by Loki, but was angry at Halfborn when he called Alex an argr, defending her. The next day, Mallory watched Alex to make sure she didn’t try anything.
In The Ship of the Dead, they were both on the Quest to stop Naglfar from Sailing, and were both friends at that point. Mallory liked the name Alex named the ship and told her that she loved it. Mallory and Alex also put up the mooring lines up together when they arrived in Norway. Alex also defended Mallory later, saying that she did the right thing by killing the thralls.
In 9 from the Nine Worlds, Alex helped Halfborn make a surprise anniversary present for Mallory and kept it a secret from her. Alex mentioned how she would rather face a dragon than Mallory, because she could get angry. Alex also complimented Mallory, saying she and Halfborn were so cute together it made her sick. Mallory later rushed to Muspellheim with the others to help her when they found out she was facing Surt.
T.J. and Alex met when T.J, Halfborn Gunderson, and Mallory Keen, visited his room to welcome him. Alex yelled insults at T.J and then turned into a cheetah. However, T.J was the least angry about it. When T.J met Alex the second time, T.J pointed a rifle at her (in weasel form) and threatened to cook her, and Alex told him to put the rifle down or he’ll wrap it like a bow tie. T.J laughed and introduced himself and everyone politely, and Alex promised not to kill him unless she had to. T.J also called her she and respected her pronouns, and wasn’t confused like Mallory was. However, T.J was still scared of the child of Loki, and told Magnus to keep an eye on her, since he didn’t want to get killed by her. T.J was also suspicious of Alex after she ran away from the, after battle, letting them get killed.
By The Ship of the Dead, the two had become good friends and trusted each other. Alex ended up going to York with Magnus and T.J to find Hrungnir. T.J helped Alex set up supplies in the pottery studio and get clay. Alex and T.J argued about what song they should play on the radio, but they both agreed to play Duran Duran. Alex also told T.J about duality masks and the two spirit people in Mexico. T.J also quickly corrected himself when he said the world argr, because he knew Alex didn’t like that term. The next morning, Alex and T.J joked around and both agreed that they weren’t going to kiss Magnus. T.J and Alex ended up fighting Hrungnir the next day, and he told Magnus to help Alex, showing how much he cared about her.
In 9 from the Nine Worlds, T.J used Alex’s room to get to Helheim, since she has branches of Yggdrasil in there. T.J also rushed to Muspellheim to help Alex when he found out that she was facing Surt.
Hearth and Alex met in The Hammer of Thor. Magnus introduced them and Alex promised that she wouldn’t kill him. Since Alex didn’t know ASL, her comrades had to translate everything Hearth said back to her. Alex also called Hearth’s personal tune, perthro, depressing when she found out the meaning behind it. Hearth also got angry at Alex when she said that she didn’t like Sif and crossed his arms, not wanting to talk to her at the moment. Hearth also joked with Alex when she was going to marry Thrym, saying she would have happy years and many children.
In The Ship of the Dead, Alex had learned a little ASL at that point. Alex helped save Hearth by telling Aegir that eating elves and dwarves were against her religion. Later, Alex heard how Hearth faced his father and expressed sympathy, saying that it was awful and she couldn’t imagine. Alex also sewed Hearth a new pink and green scarf, which a Hearth was very grateful for, and held it like a holy relic.
Blitzen and Alex met in The Hammer of Thor. Magnus introduced them and he recognized her as the other child of Loki, and Alex promised not to kill him. Alex and Blitzen got along very quickly, talking to each other, and both agreed that they should cut Magnus’s hair. Alex also reluctantly agreed for Blitzen to take a little of her blood to fix Tiny’s bowling bag. Alex also helped Blitzen by bringing him water and meals when he needed them. Later, Blitzen thought that Alex was crazy for bad mouthing Sif.
In The Ship of the Dead, Alex helped save Blitzen from Aegir by saying that eating elves and dwarves were against her beliefs. Blitzen also taught Alex how to make a sweater vest out of chain mail. In 9 from the Nine Worlds, Blitzen went straight to Muspellheim to help her after finding out that she was facing Surt.
Alex and Amir met in The Hammer of Thor, where Alex was acting as him and Sam’s male chaperone, watching them fight on the roof. Alex went with Sam and Amir to the Bifrost so they didn’t do anything irresponsible. Alex later ate falafel with Magnus, Sam, and Amir, where Alex embarrassed him by saying that he shouldn’t sit next to Sam. Alex began to like Amir very quickly.
In The Ship of the Dead, Amir still didn’t know what to think of Alex, but Alex cared for him and promised to watch over Sam for him. Alex also still acted as his male chaperone sometimes, when he was male. After he got back from the Quest to stop Naglfar from Sailing, Alex acted as his male chaperone and went to Eid with him and Sam.
In 9 from the Nine Worlds, Amir was able to tell what gender Alex was from his voice, and could tell he was male. Alex later came to Blitzen’s Best to look for Amir and complimented him to Stan, calling him tall, fit, and attractive. Alex and Sam ended up saving Amir from Stan and took his necropants off with his garrotté wire. Alex teased him after, joking about him being terrified of Sam, and agreed that it would suck if he became Stan’s private ATM.
Alex met Sif in The Hammer of Thor when she and the others were sent to Bilskirnir. Alex did not like Sif at first, calling her vain, and making fun of her palace name, making Hearthstone and Blitzen angry. Sif also did not like Alex at first, calling her it. Sif ended up helping Alex get ready for her marraige to Thrym, and Alex told Magnus that if she didn’t come back, she’d have strangled Sif and hid the body. However, Sif made Alex look amazing and Alex was very thankful, causing Sif to say maybe she should judge people so quickly. In thanks, Alex made a vase for her.
Alex was born out of an affair between His/her father and Loki. After Loki opened their eyes to the nine worlds they were never the same again. Alex was abused by her father throughout her childhood for being a genderfluid demigod, and no one did anything to stop it. Mr. Fierro also hated that his father accepted her for who she was. Mr. Fierro abused her emotionally (and implied physically) so badly that Alex would have to escape to her Abuelo’s house. The two look alike, with Alex having her fathers petite build. He also resented Alex for not wanting to take over the family business, and calling her pottery trash.
When Alex was fourteen, her father snapped and threw pottery at her and threw her down the stairs, injuring and bruising her. Mr. Fierro told her to be normal, and if it was that hard, and Alex retorted that she was normal. Mr. Fierro expressed his disappointment, saying that she understood the craft of pottery just as much as her grandfather, but Alex corrected him, saying the art, not craft. Mr. Fierro then told her she wouldn’t get any money from him, and it would go to his real children, and Alex said she didn’t want his money. He then disowned her, and slammed the door of their house.
Alex has hatred for her father, and says that he doesn’t have feelings and care about her at all. Alex has trauma from the abuse she was subjected to from him, and because of that, she had a hard time with other people and will assume that people won’t accept her. Alex is also sensitive about her past, and is uncomfortable telling people about him, except for Magnus Chase, and even he doesn’t know all the details.
While Alex’s relationship with his/her paternal step-mother is unknown, it is assumed to be negative as she did not interfere when Alex's father abused him/her.
Loki, the God of Mischief, is Alex's biological mother. He had an affair with her father and told her family about the Nine Worlds He has had contact with Alex through his/her life and taught him/her how to make a weapon out of anything. When he recognized Alex during Valhalla's battle training, he tried to kill her by causing Magnus to self-detonate by channeling his energy through him. Upon escaping, Loki willed Alex to die. This attempt however failed.
Loki warns his child to stay away from the Quest to find Mjolnir and tries to kill Alex during the wedding turned fight. However, Alex managed to resist him. Alex ended up defeating him during the flyting in The Ship of the Dead.
Alex does not like her mother at all, and admitted that she did not like him very much when she entered Hotel Valhalla. However, because of her parentage, people thought that Alex was a spy at first.
When Sam met Alex for the first time, Alex freaked out and punched Sam, giving her a black eye, because he thought he would be the same gender forever. The two ate dinner at Hotel Valhalla together, and Magnus could notice that it was very awkward from across the room. Sam mentioned to Magnus that she was not bothered by her genderfluidity, but was bothered by her constant shapeshifting, and how Loki will use that to take control. Later, Alex chaperones Sam and Amir on the roof of the Hotel, because she needed a male chaperone, and later ate lunch at Fadlan’s Falafel with Magnus. Throughout the book, Alex and Sam become friendly with each other and both agree that Sif is vain. Alex also volenteers to marry Thrym instead of Sam because she vowed to marry Amir. Sam told Alex she looked gorgeous in her wedding dress and guarded the bathroom door when she got nervous. After Loki took control of Sam again, Alex volunteered to teach her how to resist Loki’s power, and Sam declined. Alex became angry at Sam afterwards. Sam later stated to Magnus that Sam is everything she isn’t, fluid and reckless.
In The Ship of the Dead, the two go together on the Quest to stop Naglfar from Sailing, and become close. The two came up with a plan to free Hearthstone and Blitzen from Aegir and the Nine Billow Maidens. Throughout the quest, Alex helped Sam make shapeshifting her own, making Sam completely break her control of Loki by the end of the book. Alex even bought a cell phone with no purpose but to keep in touch with Sam, and texted her while she was fighting water horses. Sam was very supportive of Alex’s relationship with Magnus, and Magnus could hear her smiling when they held hands. Sam also encouraged Magnus to talk to her sibling. At the end of the book, Alex was invited to Eid with Sam and Amir, and Alex went as their male chaperone.
He was a Mexican sculptor who accepted Alex's genderfluid identity and was interested in reclaiming his Native culture. He taught Alex pottery and about the two spirit people of Mexico. When things got bad at home, Abuelo would Alex stay for the night. The two would go camping frequently. Sadly, he died before Alex turned fourteen.
- Alex is a gender neutral name - fitting, as Alex is gender fluid. The name comes from Greek "Alexandros", which means "protector of mankind."
- Fierro is Spanish for "iron."
- The conception of Alex as a genderfluid character was most likely inspired by Loki's shape-shifting abilities and his two feminine forms – a mare that has become a mother of Sleipnir, and an elderly woman called Thokk who was responsible Hel not resurrecting Balder.
- Alex is female most of the time but occasionally has "very male days”.
- Alex is the third canon LGBT demigod (after Nico di Angelo and Will Solace) to be introduced in one of Riordan's series, as well as the first confirmed LGBT Norse demigod.
- Alex has some similarities with Rachel Elizabeth Dare
- Alex is the second known demigod of Mexican descent, the first is Leo Valdez.
- According to Amir Fadlan in This Is Why I Hate Clothes Shopping, Alex’s voice changes depending on Alex’s current gender.
- Alex uses pronouns associated with whatever gender Alex is at the moment, rather than gender-neutral pronouns.
- Due to the suffering Alex endured in life, it could be possible for her to learn to use Rune Magic.
- Due to Alex being male the second time he kissed Magnus, their kiss is the first same-gender kiss in any of Rick Riordan’s works.
- Alex is the second known character with heterochromia, the first being the Manticore.