Perseus "Percy" Jackson is the eighteen-year-old Greek demigod son of Poseidon and Sally Jackson. He is the main protagonist and narrator of the Percy Jackson and the Olympians series and one of the main characters of The Heroes of Olympus series. He is the former Head Counselor of Poseidon's Cabin at Camp Half-Blood and a former Praetor of the Twelfth Legion at Camp Jupiter, formerly belonging to the legion's Fifth Cohort. He was also the temporary host of the Egyptian goddess Nekhbet.

This is all from the Wiki on the book version of Percy Jackson just the Book version