• 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

and more

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