I'd have to say Zapp Branigan purelybecause of the lines:
"I am the man with no name... Zapp Branigan" and "Kiff, I'm heading to the men's room and I'm going to be needing an attendan... oh, I'm sorry. You're crying like a woman". He's a legend and although I love Bender and Dr Zoidberg, Zapp is the funniest of the bunch. I wish they'd bring it back.