The powers he inherited from his father include controlling water, control over boats and old sailing ships, making hurricanes, breathing underwater, and talking to horse-like animals and sea creatures. Throughout the series, Percy fights by using a ballpoint pen named Anaklusmos (Ancient Greek for "Riptide") that changes into a "celestial bronze" sword.
Percy's fatal flaw is excessive personal loyalty, which he does not at first see as a danger.
Percy's best friends are Annabeth Chase, who is later his girlfriend and Grover Underwood, the Satyr.
She also spends some time in Tartarus with Percy and Bob the Titan during the House of Hades.He is the main protagonist and first-person narrator in the Percy Jackson & the Olympians series and appears in every book of the Camp Half-Blood chronicles except The Lost Hero and The Dark Prophecy.In his most recent appearance in The Hidden Oracle, the seventeen-year-old Percy states that he and his girlfriend Annabeth Chase plan to finish senior year in New York before he heads to New Rome University.As a daughter of Athena, she is naturally intelligent, with a particular gift for strategy and architecture.At the end of The Last Olympian, she is even assigned to redesign the damaged Mount Olympus.