Caillou is the titular character of the book and television series of the same name.
He was first shown in the book series of the same name by Hélène Desputeaux. He later appeared on the TV adaptation in the episode "Caillou Makes Cookies", which aired in 1997.
Throughout the Caillou TV series, he was first voiced by Bryn McAuley from 1997 through 2000, then Jaclyn Linetsky in 2000 through 2003, and then, due to Jacyln Linetsky's death, Annie Bovaird from 2003 through 2009.
Caillou lives in a blue house at 17 Pine Street with his mother, father, and younger sister, Rosie. He has many adventures with his family and friends and uses his imagination in every episode.
Just like Barney, he is also known for having a toxic hatedom (mostly comprised of immature GoAnimate users and parodists).
Appearances in parodies
He appears in MrMouser's Angry German Kid Series episode "Angry German Kid Watches Caillou Joins the Circus in Go!Animate with Bad Words".
Caillou is voiced by Tyler McAid in Episode 33: AGK VS. Caillou, and Atarster voiced Caillou in the Noah Movie: Sailor Moon's Revenge, and he'll voice him in the future videos, as well.
Tulio Sheihee's AGK Series
He was set to appear on Episode 19 as an extra character.