30 Rock - Jack Donaghey
American Dad - Roger the alien, Stan Smith
Aqua Teen - Master Shake
Arrested Development - every damn character on that show but namely, Lucille Bluth and GOB
Big Bang - Bernadette Rostenkowski
Dr. Katz - Ben Katz
Firefly - Wash
Newsradio - Bill McNeal, Dave Nelson
Seinfeld - George Costanza, Elaine Benes
The Office - Dwight Schrute, Jan Levinson (who I maintain is the best character on the show), Holly Flax and Michael Scott
Ugly Americans - Randall Skeffington

Liz Lemon is number one, though. Best character on television, ever.