Caillou
Caillou (meaning pebble or stone in French), nicknamed by himself The Prince of Imagination, is the title character of the show. Caillou was first voiced by Bryn McAuley in 1997, then Jaclyn Linetsky from 2000 to 2002, and then, due to Linetsky's death, Annie Bovaird from 2003 to 2010. Caillou was first shown in the episode "Caillou Makes Cookies", which aired in 1997.