Gaea

Gaea (Γαία in Ancient Greek, or sometimes spelled as Gaia) is the primordial Greek goddess personifying the Earth, and the main antagonist of the second series, The Heroes of Olympus. She was the third (in some stories first) being to arise from Chaos at the beginning of time. Her Roman counterpart is Terra. Terra is the Latin/Roman word for earth. Though sometimes presented as a maternal figure, particularly toward her Titan children, she can also be very cruel. In Greek Mythology she mainly exists as an enemy of the Olympians, sending Typhon and later the Giants to overthrow them. She is, however, ironically somewhat responsible for their rise to power.

The Battle of the Labyrinth
Gaea is mentioned by Annabeth. They were  covered by sand and healed by Gaea's power. Percy is able to defeat him by causing him to be disconnected with the Earth, baiting Antaeus to climb up some chains hanging from the ceiling after Percy. Percy wrapped him in the chains and then stabbed him, causing him to turn to dust with his mother unable to protect him.

A river nymph also mentions her when she tells Percy that the area around her river, including Geryon's stables, were once part of the ocean when only Gaea and Ouranos reigned. This references the first age of the world, before the Titans ruled.

The Heroes of Olympus
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The Lost Hero
Gaea appears spiritually when Leo was little and leaving his mom's work, and caused the place to burn down. Leo was alive because of his ability to resist fire, but his mom didn't make it out. So Gaea might have been very weak but beginning to wake, when Leo was little. Gaea also appeared during Jason's Quest to save Hera, speaking to Leo through a mnk the poisonous Gorgon blood, for which she states his death will be more painful than Gorgon's blood. Ella stated that "the lady in the ground" has big plans for him.

Later, she stations Laistrygonians outside the Zhang mansion to kill Frank Zhang, and a few days later attempts to capture Percy and Hazel when they fall into muskeg and taunts them when they regained the Eagle. She also appeared and talked to Hazel about Nico di Angelo, Hazel's half-brother, who she kidnapped and held him somewhere in Rome.

The Mark of Athena
Gaea sends the Eidolons to possess three members of the seven (Percy, Jason and Leo). She also talks to Piper in Kansas telling her to make a choice between Percy and Jason, as she needs the blood of male and female demigod to awaken. Piper refuses to choose and saves the boys from killing each other. The earth goddess also demands Otis and Ephialtes for Rome to be destroyed on July 1st.

She appears to Percy in a dream in a human-like form, telling him that he will fall alone and that she plans on destroying Camp Half-Blood and leaving it bare forever to show that the demigods where powerless to defeat her and the giants. She leaves Percy with a message to enjoy Tartarus. According to the twin giants Otis and Ephialtes, the earth goddess has chosen Percy Jackson, son of Poseidon and Annabeth Chase, daughter of Athena to be the sacrifices to awaken her. They later state she will awaken in one month.

She also continually tells Leo that he is the "seventh wheel" meaning that he will never be able to fit in with the other six demigods.

Personality
In many ways, Gaea is the ideal mother, loving her children first and foremost. She will do anything to protect them, even if it means taking the most extreme measures. It is because of this protectiveness that she is known to be very cruel to anyone who threatens them. Oddly, this includes the Gods, who are her own grandchildren.

Gaea is very manipulative towards the Seven, as she is trying to convince Percy to join her along with Hazel and wants to kill Frank, Jason, Piper and Leo. Im fat 2

Appearance
Because Gaea is literally the earth itself, she may not have a physical form to speak of. However, she tends to appear to people in the form of a woman wearing a cloak made of black dirt that churns and shifts, as well as a veil made of dust. Behind the veil is a pale face that appears to be asleep, signifying that Gaea is not yet awake. Leo - when he was younger - confused her with Hera, but Gaea simply said it was a family resemblance. Gaea will sometimes appear to people in the form of a giant sleeping face, such as when she shifted the snow, asphalt, and chemical sludge from some toilets to make a face. Percy thought he saw her face in his dreams when she manipulated some clouds to cast a shadow of her face on a mountain overlooking Camp Jupiter.

During The Mark of Athena, Gaea once again visits Percy in his dream. Instead of the dark cloak she wore when visiting Leo in his youth, she appears in a forest green robe will small amounts of gold and white, as if sunlight were shining on the robe through tree branches. She had black hair that was the same color as tilled soil and she had a beautiful face, even if her eyes were originally closed. When she opened her eyes, they appeared green and black, like the crust of the earth.

Abilities

 * She presumably has a goddess' powers, but infinitely stronger as she is one of the Protogenoi
 * Geokinesis- the ability to manipulate the earth
 * She knows whatever happens on the earth
 * She can show other people memories or visions from the past
 * She can manifest from dirt while sleeping
 * She can possess people for short periods of time when they're asleep
 * Possibly precognition (As she told Percy to enjoy Tartarus before he went there)

Trivia

 * Gaea, a crater on Amalthea (a moon of Jupiter) is named after her.
 * Gaea's Roman name is Terra. However in the series, she is known as Gaea to both Greeks and Romans. Though, like Thanatos, Romans could prefer for her to stay Greek.
 * In The Son of Neptune, Nico says that Gaea was stirred in her sleep when the Titans lost. But, when Hazel has her flashbacks, it appears that Gaea has been planning to overthrow the gods since World War ll. It is possible that she went back to sleep again after the end of the War and woke again when the Titans were defeated.
 * In The Heroes of Olympus, Gaea appears as a giant sleeping woman's face, first appearing in toilet sludge in The Lost Hero; she then appears in the shadows of clouds and mountains in The Son of Neptune.
 * Her sacred animals are the serpent, the lunar bull, the pig, and bees.