Leo

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Leo is Caillou's adorable 4 year old male best friend of Caillou. In one episode, Ms. Martin is Leo's mother but in other episodes his mother is a different woman. Despite his cuteness, Leo started out as a mean boy in the 1997 episode, "Caillou at Daycare", but quickly befriended Caillou in the same episode. They have been inseparable since. In the 2003 film Caillou's Holiday Movie, It is revealed that he is Jewish. Leo has orange hair and wears a yellow shirt with a red long-sleeve shirt underneath, green pants held up by blue suspenders, and red sneakers with blue trim and yellow straps.