Yves Brunier (born in 1943) is a French puppeteer. He is best known for his muppet Casimir, an orange colored dinosaur who appears on French Children's TV. He played Chelli in Sacatruc, the French version of Big Bag. Brunier later went to perform on Rue Sesame as Yoyo of 5. He also performed on the Muppet Show TV pilot.