Ooooo... that's a tough one! I Think that Oz had some GREAT lines that had me laughing for a while, but Xander was so randomly stupid and it made me laugh too, Willow was adorable-funny(but she is my fav character so I'm not gonna make my vote bias haha), Buffy had some funny lines too like when she'd ask Giles something, she'd get like this look on her face and Idk, it was funny, and then of course Cordelia with her tactlessness and comments that made NO sense, like "One of these days your gonna wake up in a coma!" always cracked me up, Spike had some pretty damn funny comebacks too like "Out. For. A. Walk... Bitch.", and Giles, when he used to say stuff about "Americans" it made me laugh, and last but definitly not least, the one I voted for, Anya, she had some of the most priceless lines on the show... I just love how she would always say stuff about sex, it is just like me, she's sarcastic, but also, she doesn't know anybetter for a while, then I just think that is her personality and it's freaking awesome.