Andy Dick (NewsRadio, Less Than Perfect)
Thomas Haden Church (Wings)
Michael Richards (Seinfeld)
Stephen Root (NewsRadio)
John Larroquette, Richard Moll (Night Court)
Michael Jeter (Evening Shade)
Faith Ford (Murphy Brown)

Ed Norton--The Honeymooners

Luther Van Dam--Coach

Phil Hartman (Bill McNeal) in "NewsRadio"
Art Carney (Ed Norton) in "The Honeymooners"
Jonathan Slavin (Byron Togler) in "Andy Richter Controls the Universe"

Laurie Metcalfe-Roseanne

Valerie Harper-Mary Tyler Moore

Julia Duffy- Newhart

Peter Scolari- Newhart

Arnold The Pig -Green Acres pig:

The Olsen Twins- Full House

Valerie Harper (The Mary Tyler Moore Show)
Barney Fife (The Andy Griffith Show)
Julia Duffy (Newhart)
Andy Kaufman and Carol Kane (Taxi)
Nancy Walker (Rhoda)
Raven-Symone (The Cosby Show)

Jeff Garlin (Jeff)-Curb your Enthusiasm
Ted Danson (Ted)-Curb your Enthusiasm
Richard Lewis (Richard)-Curb your Enthusiasm
Wanda Sykes (Wanda)-Curb your Enthusiasm [I didn't like her at first but she's ok now although the only episode that actually focased on her <"Krayzee Eyez Killah"> is still the show's worst episode]

Gotta be Michael Richards. He is a master at stealing a scene.

Barney Fife (Don Knotts) (The Andy Griffith Show)