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He is also one of seven main protagonists of the sequel series The Heroes of Olympus, appearing in every book except The Lost Hero, and appears in the ongoing Trials of Apollo series, making him one of the few characters to appear in all three series of the Camp Half-Blood chronicles. Egyptian crossover stories, part of the Demigods and Magicians collection.
The character serves as the narrator in Percy Jackson’s Greek Gods and Percy Jackson’s Greek Heroes, also by Rick Riordan. Development of the character Percy Jackson began when Rick Riordan started inventing stories for his son Haley, who was diagnosed with ADHD and dyslexia in the spring of 2002.