Alvin Seville / Simon Seville / David 'Dave' Seville / Alvin / Simon / Clown #1 / Grandpa Seville / Lance Slick (102 episodes, 1983-1990)
Theodore Seville / Brittany Miller / Eleanor Miller / Jeanette Miller / Brittany / Eleanor / Jeanette / Theodore / Miss Mooney / Roxanne / Theodore Miller / Vinny (102 episodes, 1983-1990)
Additional Voices / Gremliones / Roland Bellyache / Security Guard / Uncle Harry (62 episodes, 1983-1990)
Miss Rebecca Miller / Additional Voices / Helga the Babysitter (49 episodes, 1986-1990)
Additional Voices / Lilly the Dog / Uncle 'Adventure' Willy / Announcer / Binky Bunny / Car Voice / Clown #2 / Clown #3 / Heraldo Riviera / Man / Master of Ceremonies / Skip St. Cool (44 episodes, 1988-1990)
Additional Voices / Missy Snootson / Museum Attendant (42 episodes, 1983-1987)
Additional Voices (42 episodes, 1983-1987)
Additional Voices (39 episodes, 1984-1987)
(36 episodes, 1983-1985)
Additional Voices (31 episodes, 1984-1986)
(26 episodes, 1983-1984)
Additional Voices (26 episodes, 1983-1984)
(23 episodes, 1984-1985)
Additional Voices (23 episodes, 1984-1985)
(16 episodes, 1986-1987)
Additional Voices (16 episodes, 1986-1987)
(13 episodes, 1983)
Additional Voices (13 episodes, 1983)
J.B. (13 episodes, 1983)
Additional Voices (13 episodes, 1984)
(13 episodes, 1984)
(10 episodes, 1985)
Additional Voices (3 episodes, 1984)
Dolly Parton (1 episode, 1983)
Mr. T (1 episode, 1983)
Additional Voices (1 episode, 1983)
Clyde Crashcup (uncredited) (1 episode, 1990)