Memoirs of an imaginary friend
(Book)

Budo is lucky as imaginary friends go. He's been alive for more than five years, which is positively ancient in the world of imaginary friends. But Budo feels his age, and thinks constantly of the day when eight-year-old Max Delaney will stop believing in him. When that happens, Budo will disappear. Max is different from other children. Some people say that he has Asperger's Syndrome, but most just say he's on the spectrum. None of this matters to Budo, who loves Max unconditionally and is charged with protecting him from the class bully, from awkward situations in the cafeteria, and even in bathroom stalls. But he can't protect Max from Mrs. Patterson, a teacher in the Learning Center who believes that she alone is qualified to care for this young boy. When Mrs. Patterson does the unthinkable, it is up to Budo and a team of imaginary friends to save Max and Budo must ultimately decide which is more important: Max's happiness or Budo's very existence.