Lol why was Caillou "totally banned" for your little kids??
For a while, Google's canonical answer to "Why is Caillou bald?" was "Caillou can't grow hair, not because he has cancer or progeria, but because he sucks, and even his own body recognizes that he does not deserve hair or food or love." https://www.sbnation.com/2014/3/26/5549908/arian-foster-cail...
He whines, about just about everything, everywhere. Relentlessly. https://youtu.be/cGo60pp_9IM?t=6m30s It got really annoying when my wife and I watched it with some of my nieces (and saw how the show influenced their behaviour) that when we had kids of our own we agreed that we'd never allow them to watch Caillou.
"Minor" character flaws that I'd point out were that Caillou had to be told by his mother to say thank you to the bus driver, and that he gifted the bus driver with a drawing of himself riding the bus (what an egomaniac that Caillou).
But yeah, I don't have kids, so is normal that I never thought of supervising what tv cartoons would they watch, and now is something important that I'll pay attention in the future.