Caillou Tollar is the main protagonist of the program of the same name. He’s also a guest star and main character in the show School Daze. He is evil, sinful, villainous and his interests include Chuck-E-Cheese’s and Word Domination. He used to be a minor character in the show School Daze, but ever since School Daze: The Movie, he became part of the main cast & he started appearing in every episode.
Caillou is an evil kid, he did so many bad things. Like, for example, he gave Rigby rabies in “Phineas and Ferb: The School Daze”, which resulted in him losing his right arm. He also snuck off to Chuck-E-Cheese’s in his Grounding Videos. Everything he does always results in him getting grounded by his parents. Tico used to be his partner-in-crime, but he started to dislike Caillou after he made him go savage in “Phineas and Ferb: Off to the Falls”. Caillou would always torment Boots by yelling at him, beating him up, and telling him to shut up. In earlier episodes, Caillou was actually nice to Boots, he’s even included him in him and Tico’s antics. Dora, being the girlfriend of Caillou, is completely unaware that he is a terrorist. Caillou is the only one of Tom’s friends who Trent actually likes.
Caillou has fair skin, blue eyes, and a bald head. He wears a yellow T-shirt with a red collar, blue shorts, white socks with red stripes, and red sneakers.
In his original show, Caillou's socks were yellow, and his shirt was gray in the first season.
In Gym Class, he wears a gray t-shirt with blue cargo shorts. Starting with Season 29, his t-shirt is white and his cargo shorts are black.
In cold weather, Caillou wears a yellow snowsuit underneath a black vest, a gray and purple helmet with goggles, purple gloves, and black boots.
When Swimming, Caillou wears a pair of yellow swim trunks with red trim.
- Caillou was originally going to die in the School Daze Thanksgiving Movie, but that idea was scrapped because it was "just to predictable".
- Caillou is the 3rd most popular character in the School Daze series.
- Caillou was voiced by 6 actors.