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Boy/Girl (Season 1) (English Language version) (voice)
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Leo (English Language version)
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Deedee (sometimes captioned as "Deidi") (English language version)
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Gilbert Felinieus Cat (English language version)
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Julie (English language version), Cailette Singer
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Maman de Caillou (@ Doris) (French language version)
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Grand-maman de Caillou(Season 2+)
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Narrator (Season 1) (French language version)
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Dédé (@ Deedee) (French language version)
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Mousseline (@ Rosie), Clémentine (@ Clementine) (French language version)
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Caillou (French language version)
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Rexy (French language version)
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Grand-papa de Caillou (French language version)
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Grand-maman de Caillou (Season 1), Narrator (Season 2+) (French language ve...
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Léo (@ Leo) (French language version)
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Sarah (French language version)
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Maman de Clementine (French language version)
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Gilbert (French language version)
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Caillou's dad (@ Boris) (English language version)
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Caillou (Season 1) (English language version)
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Caillou's mom (@ Doris) (English language version)
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Narrator (English language version), Grandma who reads the books to the kid...
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Rosie (Season 1), Clementine (English language version)
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Caillou (Season 2+) (English language version)
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Rexy (English language version)
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Matthew Theodore "Teddy" Bear (English language version)
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Nounurs (@ Teddy) (French language version) (as Hugolin Chevrette)
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Rexy (CD-ROMs, filling in for Pier Kohl) (English language version)
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Rosie (Season 2+) (English language version)
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Caillou's Grandpa (English language version)
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Caillou's Grandma (Season 2+) (English language version)
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Papa de Caillou (@Boris) (French Language Version)
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Cailette singer