This may sound stupid, or obvious, but I think I understand the creaters' idea. The whole idea of Futurama, besides being a laughfest, is this:
Fry and Leela are two very lonely people who are destined to meet, thus involving Nibbler, whose role is rather important. Bender is really just for laughs, as well as most of the others. I think they'e trying to tell you isn't just what he seems- there's more to that. The main story is Fry changes, he grows within himself. Please post your thoughts on what the hell I'm talking about.