King= Fry- In that outfit that he wears on the playing card.
Queen= Leela- Ditto.
Bishop= Bender/Flexo- In some sort of Pope Outfit. I say both of them because I think it'd be interesting to have the Bishops be slightly different and that. (Not two whole different characters! Sheesh. Wouldn't that just be confusing?)
Knight= Zapp riding on Felicity. With some sort of cocky grin on his face, of course. OR! Zoidberg riding Fry's sperm. *giggles like a schoolgirl*
Rook= The Planet Express Building would make a very cool one. If they could make it look half-decent...
Pawn= Cubert. 'nuff said.
EDIT: And yes! Welcome to PEEL.
Be sure to read the FAQ
, as PEEL is pretty strict compared to many other boards. See the sights, try the veal, and listen to Lampy's every word.