Characters in The Lightning Thief

Percy Jackson

Twelve-year-old son of Poseidon discovering his demigod identity.

Also in The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, Percy Jackson and the Sword of Hades, The Last Olympian, Percy Jackson and the Singer of Apollo, The Chalice of the Gods, Wrath of the Triple Goddess, Percy Jackson's Greek Gods, Percy Jackson's Greek Heroes

Annabeth Chase

Daughter of Athena and Percy's quest companion.

Also in The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Chalice of the Gods, Wrath of the Triple Goddess, The Demigod Files

Grover Underwood

Satyr protector assigned to guide Percy.

Also in The Sea of Monsters, The Battle of the Labyrinth, The Last Olympian, Percy Jackson and the Singer of Apollo, The Chalice of the Gods, Wrath of the Triple Goddess

Chiron

Immortal centaur who trains heroes; poses as Percy's Latin teacher before revealing himself.

Poseidon

God of the sea and Percy's absent divine father.

Also in The Chalice of the Gods

Hades

God of the Underworld, initially suspected of orchestrating the theft.

Also in Percy Jackson and the Sword of Hades

Zeus

Also in The Chalice of the Gods, Percy Jackson's Greek Gods

Dionysus

Ares (god)