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- Caillou as Mr. Happy
- Leo as Mr. Small (in 1970s, 1980s & 1995)
- Mr. Washington as Mr. Tickle
- Doris as Little Miss Sunshine
- Boris as Mr. Bump
- Grandpa as Mr. Forgetful
- Grandma as Little Miss Whoops
- Billy as Mr. Worry
- Sarah as Little Miss Daredevil
- Jason and Jeffery as Mr. Small and Mr. Nosey (in the 2008 series)
- Rosie as Little Miss Chatterbox
- Gilbert as Mr. Bounce