The son of the gods.

Percy Jackson lived a happy normal live until monsters came and killed his foster parents.
He meets his real mother and she teaches him for a year, when she too gets killed by the Minotaur.
Having learned of Olympus from his mother he goes to the gods to request a job.
Gaurdian of then hunt.
Pertemis comes later on.
Disclaimer: I do not own any of the characters just the plot. Rick Riordan owns Percy Jackson