The main characters in "The Lightning Thief" are Percy Jackson, Annabeth Chase, Grover Underwood, Sally Jackson, Luke Castellan, Poseidon and Zeus. Percy Jackson is the hero and narrator of "The Lightning Thief."
Percy is the son of Poseidon, the ruler of the sea and one of the "Big Three" gods. His mother is a mortal named Sally Jackson, making Percy a demigod. Annabeth Chase is Percy's friend and daughter of the Greek goddess, Athena. Percy's best friend is Grover Underwood, who is a satyr. Both Annabeth and Grover help Percy in his quest.
"The Lightning Thief" is a fantasy-adventure young adult novel that was written by Rick Riordan. It is the first book in the "Percy Jackson and the Olympians" series, and characters from Greek mythology are used in the novel.