A.J. is one of Timmy's two best friends. A.J. is smart and rich, but is not very good at social skills and as a result he is considered an unpopular kid like his two friends.
He is the only student that seems to ever pass tests in Mr. Crocker's class. He mostly wins the school science fair as well, even when up against Timmy and his fairies, because fairies cannot help win competitions. A.J.'s family is very wealthy and they live in a big house, which is located near Chester's trailer.
The live-action grown-up A.J., portrayed by Jesse Reid.