* His own experiences as a kid: Philbrick grew up in a small town and experienced some of the social challenges and feelings of isolation that Max, the protagonist, faces in the book.
* His fascination with superheroes: Philbrick was a fan of comic books and superheroes, and he incorporated that interest into the novel by having the characters, Max and Kevin, see themselves as having superpowers.
* His desire to explore themes of friendship and acceptance: Philbrick wanted to write a story about two unlikely friends who learn to rely on each other and overcome their differences.
* His research on people with disabilities: Philbrick spent time researching the lives of people with disabilities to ensure he portrayed Kevin's character authentically and sensitively.
In an interview, Philbrick said:
> “I wanted to write about the power of friendship and how people can help each other overcome adversity. I also wanted to explore the idea that everyone has something to offer, even if they are different from everyone else.”
Therefore, "Freak the Mighty" is a product of Philbrick's personal experiences, his interests, and his desire to create a story that resonates with readers about the strength of friendship and the importance of accepting those who are different.