Rexy is Caillou's stuffed dinosaur. He was only seen during the Puppet segments in Season 1. Rexy is a light blue color. He is very playful and also has some speech impairment. If somebody teases him about it he gets very upset. During the puppet segments of the show Rexy likes to pretend he is an explorer and wants to go around the neighborhood. Rexy also plays with Deedee a lot too. Rexy has been seen in Caillou's room after Season 1 but he hasn't ever had any speaking lines since the puppet segments ended. The 3 other puppets with aren't his real family, but he does live with them. He is a good artist.
He is a toy that Caillou bought from a store.
Rexy does have a short book on him that sometimes appear at the end of the show.