Perseus "Percy" Jackson is a young demigod, the son of the mortal Sally Jackson and the Greek god Poseidon. He is the main protagonist and first-person narrator in the Percy Jackson & the Olympians series and one of the 7 main characters in the follow-up Heroes of Olympus series. He appears directly in every book of the two series except The Lost Hero, though he is mentioned in all. Like other half-human demigods, he is expected to act as the Olympian gods' agent in the mortal world, taking action where ancient laws forbid direct godly intervention, usually in the form of quests. In "The Lightning Thief" Poseidon says that Percy was the result of his "wrongdoing ", which makes Percy a bit uncomfortable. He is twelve years old in The Lightning Thief, and 16 years old in The Last Olympian. The Blood of Olympus (the last book of the franchise) ends with Percy and his girlfriend Annabeth Chase planning to finish senior year in New York before heading to the college in New Rome.
The powers he inherited from his father include controlling water, making hurricanes, breathing underwater, and talking to horses and sea creatures. He is also a notably good swordsman. Percy's fatal flaw is excessive personal loyalty, which he does not at first see as a danger. Throughout the series, Percy fights by using a ballpoint pen named Anaklusmos (Ancient Greek for "riptide") that changes into a "celestial bronze" sword when it is uncapped (in the books) or clicked (in the movies). He is described as having a "Mediterranean" complexion, with black hair and his father's sea green eyes.
In the films, he is portrayed by Logan Lerman.