Percy Jackson is a 17 year old boy who happens to be a demigod and the protagonist of the story. He is the son of the Greek god Poseidon, god of the sea. He is one of the main characters in the book and he and his girlfriend, Annabeth Case are stuck in Tartarus.
Percy Jackson and the Olympians. The book was also made into a movie. The top picture is of Grover who is a friend of Percy's and a satyr(half goat half human) the test of of Percy and Poseiden's cabain at camp half-blood the Greek demigod camp