Who is Bonce from Loser?

At first, Bonce isn't very nice to Zinkoff. When Zinkoff wants to play basketball with the boys.... Bonce is one of the boys, who refuses to let him play. Bonce is, however, fascinated by Zinkoff's dedication to Claudia, and eventually, he chooses him on his team. Bonce is actually kind of a nice guy.