Percy Jackson

"At first, I didn't believe it either. But the gods of Olympus are real. And sometimes, these gods have children with humans...Called half-bloods. I'm one of them. I'm Percy Jackson. Son of Poseidon, god of the sea."

- Percy's opening narration

Percy Jackson is the protagonist of Percy Jackson & the Olympians: The Lightning Thief and Sea of Monsters. He is the Greek demigod son of the Olympian Poseidon and the mortal, Sally Jackson.

Background
Perseus "Percy" Jackson was born August 18 (presumably 1994/1995 in the film timeline) to Poseidon and Sally Jackson. When he was a few months old, despite Poseidon loving his son, was forced to leave because he started becoming more human and abandoning his duties as the god of the sea. Because of this, Zeus made a law that other gods were not allowed to have any contact with their children. However, Poseidon would often speak to percy telepathically and continued watching him from afar.

The Greek god had a cabin built for his future children.

Percy also had a half-brother for a Cyclops, Tyson. (The Sea of Monsters)

Percy was best friends with Grover Underwood, who was sworn to protect him and together, they attended Yancy Academy.

Quotes
Grover: "I understand, this is like high school, without the musical
 * Percy: "I would rather spend all day on the water, instead of this place."

Annabeth: That was training.
 * Percy Jackson: "Today, you wanted to kill me. Now you want to protect me?