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|“||I'm just a kid who's four, Each day I grow some more, I like exploring, I'm Caillou. So many things to do, Each day is something new, I'll share them with you, I'm Caillou. My world is turning, Changing each day, With mommy and daddy, I'm finding my way! Growing up is not so tough, 'Cept when I've had enough, But there's lots of fun stuff, I'm Caillou. Caillou, Caillou, I'm Caillou. (giggle) That's me!||„|
|~ Caillou theme song.|
Caillou is the main protagonist of the series of the same name. He is a four-year-old boy who can sometimes be nice or rude to others. He is the older brother of Rosie, and the son of Boris and Doris. His friends are Clementine, Sarah, and Leo. His teacher is Ms. Martin.
Caillou is a four-year-old kid with no hair and black eyes and always wear a yellow tee with a red collar with blue shorts and socks with red shoes. In Fox, he wears a yellow vest, gold long-sleeved shirt, gold belt, navy blue long pants and grey boots.
Caillou's age was 2 ½ years old when his little sister Rosie was born in the "Big Brother Caillou" episode, and then he turned 3 year old for the first 18 episodes of the first season, After the episode "Caillou's Birthday" he turned 4 years old and remains this way for the rest of the series. One time he pinched his baby sister Rosie in the Big Brother Caillou episode because he didn't like her. His dad heard Rosie crying and he asked why he pinched Rosie and later they smelled something bad and changed her diaper. He later shows kindness to his sister Rosie in later episodes. But, sometimes he can be mean to Rosie.
- Caillou's misbehavior throughout the show made him an infamous character among older viewers, since Caillou's troublemaking and whining was considered to be annoying and his parents accepting his actions rather than disciplining him didn't clearly show that his actions were wrong and as such he didn't learn from his mistakes. Parents have even claimed that their children became naughtier when watching Caillou and copying the titular character's behavior. Caillou is considered to be the most universally reviled children's program by many people, which has led to the many posts, memes, discussions, and even official news articles detesting it becoming a well-known internet phenomenon.
- On January 5, 2021, Caillou was finally taken off the air.
- In the books, Caillou originally had hair, but this was changed due to the fact that it would make him unrecognizable, so the creators decided to leave him bald, leading to the urban myth that Caillou has cancer/progeria.