Percy is a dynamic character. His archetype changes over the course of the book. At the beginning of the book, he is the archetypal “the fool”. This can be seen on page 54 , where the author writes:
”I started feeling cranky and irritable most of the time. My grades slipped from D’s to F’s. I got into more fights with Nancy Bobofit and her friends. I was sent out into the hallway in almost every class. Finally, when our English teacher, Mr. Nicoll asked me for the millionth time hy I was too lazy to study for spelling tests, I snapped. I called him an old snot. I wasn’t even sure what it meant, but it sounded good. The headmaster sent my mom a letter the following week, making it official: I would not be invited back next year to Yancy Academy”
But by chapter 20, Percy has begun to transform into the archetypal “the warrior”. The event that triggers this transformation is Percy realizing that it was Ares who was behind the crimes and Percy fought with him in a one on one duel, and won. Evidence of this is in chapter 20 where it says, “Ares lowered his sword. ‘You have made an enemy, godling’ he told me. ‘You have sealed your fate. Every time you raise your blade in battle, every time you hope for success, you will feel my curse. Beware, Perseus Jackson. Beware’.”
Percy is no longer the person who gets bad grades and gets kicked out of school for bad behavior.
A reader will recognize that the turning point for Percy comes when he gets mad at Ares . Chapter 20 encourages this belief.
“The giant boar charged. But I was done running from monsters. Or Hades, or Ares, or anybody.” This quote from the text shows how Percy has grown as a person throughout the story.