Identify the theme

The Lightning Thief is all about identity and about discovering identity. At the beginning of the story, Percy Jackson doesn't yet know who his father is or that he has any special powers of any kind. He thinks of himself as a "bad kid," one who always gets into trouble. Over the course of the story, however, he learns things about himself that he never thought possible. What he thought were weaknesses like his dyslexia, attention deficit disorder, and knack for attracting trouble turn out to be the markers of a demigod and a particularly powerful one at that