Similar to the films thread, but there are some good possibilities on TV.
MADTv - There's so many! Stuart, Ms. Swan, Fightin' Ron, office guy (Sneaky Snake!), Lorraine (huh huh huh!), Dot, to name a few.
Chappelle's Show - Dave himself, Tyrone Biggums w/crack and doo doo, R. Kelly (guess what his action feature would be!), the Player Haters, Blackzilla vs. Godzilla boxset
Well really that's all I got for now, but I know there has to be some others.