Sanjay appears as one of Timmy's "back-up friends" along with Elmer (Timmy's main friends are A.J. and Chester), and is often striving to get recognition from the other three. He is a stereotypical nerdy student who likes doing homework so much that he actually reminds the teacher to give it out, much to the chagrin of his classmates.
Sanjay appears to be of Indian (South Asian) descent, as "Sanjay" is a Hindi name meaning "victorious." He wears a tucked in yellow shirt with gray pants and he has round glasses with bluish green pupils. His hair sort of resembles Chester's, except Sanjay's hair is black. He is apparently the weakest and scrawniest of his friends.
Sonic Youth - Sanjay's superhero alter-ego in the Crimson Chin comics.