Brendon Small / Various / Walter / Dwayne / Junior Addleburg (52 episodes, 1999-2004)
Jason Penopolis / Coach John McGuirk / Perry / Various (52 episodes, 1999-2004)
Melissa Robbins (52 episodes, 1999-2004)
Ronald Lynch (41 episodes, 1999-2004)
Paula Small (47 episodes, 2001-2004)
Fenton Mulley / Cho / Mr. Pendlehurst / Paula's Father / Temp Guy (12 episodes, 2002-2004)
Eric Robbins / Erik Robbins (8 episodes, 1999-2004)
Various / Acting Teacher / Client / Dennis / Doctor / Judge / Steven / Writer (5 episodes, 2001-2002)
Linda / Freda / Improv Girl / Loni (7 episodes, 1999-2004)
Cynthia / Nurse Kirkman / Doris (7 episodes, 2001-2002)
Paula Small (5 episodes, 1999)
Jimmy Monet / Angry Fan / Charlie / Junior Addleburg / Larry / Ned Robbins / Richard (4 episodes, 2001-2002)
Andrew Small (5 episodes, 2002)
Dr. Fizzel / Eulogist / Mitch / Police Officer (4 episodes, 1999-2001)
Mrs. Peabody / Trudy Mulley (4 episodes, 1999-2002)
Arnold Lindenson (4 episodes, 2002-2004)
Shannon (3 episodes, 1999-2004)
Stephanie (3 episodes, 2001-2003)
Erik's Girlfriend / Journal-Writing Instructor (2 episodes, 1999-2004)
Eugene (2 episodes, 1999-2004)
Josie Small (1 episode, 2001-2002)
Clarice (2 episodes, 2002)
Doctor (1 episode, 2003)
Mr. Peabody (1 episode, 1999)
Babysitter (1 episode, 1999)
Guy in Grocery Store (1 episode, 2001)
Penny (1 episode, 2004)
(1 episode, 2001)
Drew (1 episode, 2001)
Helmet (1 episode, 2002)
Coach / FPC Floating Head (1 episode, 2002)
Tom Wilsonberg (1 episode, 2002)
Video Store Clerk (1 episode, 2004)
Tonko the Parrot (1 episode, 2004)
Driving Instructor (1 episode, 2004)
Honkey Magoo (1 episode, 2004)
Musical Camp Counselor Miguel (1 episode, 2004)
Simon (1 episode, 2004)
Musical Camp Counselor Mike (1 episode, 2004)
Therapist (uncredited) (1 episode, 2002)