Percy Jackson, Annabeth Chase, and Grover Underwood

Percy Jackson

Percy Jackson is the son of Sally Jackson, and the step son of Gabe Ugliano. Gabe and Percy do not get along at all. Percy never knew his biological father and has a history of being kicked out of a different school every year. At the beginning of the story, he learns that he is a demigod, or a half blood, because he is Poseidon's son. Along with the joy of discovering his fathers identity, Percy finds danger because Poseidon was not supposed to have more children because because of a treaty with his brothers, Zeus and Hades. His best friends are Grover, a satyr, and Annabeth, daughter of Athena, though he and Annabeth are constantly getting on each other's nerves.

Percy is very caring and courageous, and because of his heritage, he has some control over water, including breathing underwater and, even after being completely submerged in water he always comes out completely dry. Also, whenever he steps into water and is sick or hurt, the water will heal him, something he relies upon many times. Percy has been accused of the theft of Zeus's lightning bolt and goes on a quest to find it to prevent an Olympian war between Zeus and his father, Poseidon. This he must do while being constantly chased and attacked by monsters sent from Hades. Meanwhile, all is not as it seems, another is behind the growing tensions with a totally different agenda.
 

Annabeth Chase

Annabeth Chase is the half-blood daughter of the Goddess Athena and the mortal man, Frederick Chase. Being a daughter of Athena, who is a maiden goddess, she was not physically born, but is a literal "brain child"—she was born as a gift to the man her mother loved. When she was seven, she ran away from home. On her journey, she met Luke Castellan, Thalia Grace, and Grover Underwood. Together, they journeyed to Camp Half-Blood, fleeing and fighting hordes of monsters. Upon arrival at the borders of Camp Half-Blood, Thalia sacrificed her life when they were attacked by monsters so Luke, Grover, and Annabeth could safely get into camp. She lived at Camp Half-Blood for five years prior to Percy Jackson's arrival.

It was shown^{[by whom?]} that Annabeth does not get along with her father and stepfamily. According to her, her father was not very happy when she first appeared and tends to look at her as a nuisance. Her stepsiblings appear to dislike her and feel afraid of her. Her stepmother seems to hate her and feels that she endangers her family by being only half-mortal. At the end of The Lightning Thief, Annabeth returned to her family to see if she could get along with them. She was able to stay with them for approximately a year, but her feelings towards her family are unknown. However, in The Titan's Curse, her father and stepmother seem to care for her deeply, and her father helps fight off Kronos's army to save Annabeth.

Annabeth is a good fighter, and is able to think on her feet in high-pressured situations. Despite this, Annabeth dreams of being an architect, and the story made many references to this. In The Lightning Thief, she enjoys and quickly becomes addicted to the 3-D holographic SimCity-esque game at the Lotus Hotel and Casino, and in The Sea of Monsters, it was shown that Annabeth’s greatest dream is to redesign the whole world to make it better, make Luke good again, and be accepted by her mother and father. In The Last Olympian, she is granted the status of being the architect of Olympus. Percy then becomes her boyfriend and they kiss in the 4th and 5th book.

In The Battle of the Labyrinth, Percy says, "Annabeth wasn't going to accept an easy answer, even if it got her in serious trouble." He also says that's one of the things he likes best about her.

Hubris, or deadly pride, is Annabeth's fatal flaw. Annabeth thinks that she is able to do anything: get her parents back together, build great monuments, and save Luke as shown in the second book. She sometimes even thinks she can rebuild the world into an even better place than the immortals did. She also has a deep fear of spiders, due to the contest between Athena and Arachne.

Grover Underwood

Grover is the best friend of Percy Jackson, with whom he has an "empathy link", allowing them to share emotions, but also means if one of the two dies, the other will probably die, too (or that they will be left in a permanently vegetative state).
Grover is shown to be a bit cowardly, getting afraid easily. When this happens, his eyes turn to slits like a goat's and he starts eating furniture. He always tries to defend his friends and is very loyal. He also can cope with dangerous situations fairly well, for example, when he was kidnapped by Polyphemus the Cyclops. He is known to like enchiladas, as mentioned several times throughout the series. It is also revealed in The Last Olympian that he is afraid of rabbits (which Thalia calls his "bunny phobia")
Being a satyr, Grover loves nature very much and hates pollution. In the third book, it is revealed he has a crush on Artemis, the goddess of the hunt. He comments, "She's so...into nature." He also likes to be near the Hunters of Artemis. Grover's girlfriend is a nymph named Juniper. They are first shown together in The Battle of the Labyrinth. He often helps out animals and can talk to them. Grover's ambition is to find Pan, the god of the wild. He is also afraid of cyclopes, which makes it hard for him to interact with Tyson, Percy's younger half-brother.