Chuck has a European accent and a snooty attitude. He became a running gag along with Leon, having several odd jobs such as being gym owners, running a client agency for clients who need help to break bad habits (in Rocko's case, nail biting), running a hair salon (Haute Coiffeur), and owning a café. Most, if not all, of these establishments are, by their own admissions, very exclusive (such as for people with "an exclusive amount of cash", as was the case in the episode Tooth and Nail). He says that they once worked for a Czar (who resembled Heffer) in the fictional country of Balzak before immigrating to America. Chuck is voiced by Tom Kenny.
Chuck is naked most of the time, though he does sometimes wear shirts. He is lime green with light blue lips, just like his brother Leon. Despite being a chameleon, he and his brother look more like gecko/dinosaur hybrids.
- Out of all the characters in the show (not including the minor cast), he and Leon Chameleon have developed the least. Throughout the series, they stayed the same snobby entrepreneurs they always were.
- He and his brother are sometimes used as background characters
- Despite making frequent appearances in the series, he and Leon Chameleon are still some of the more forgotten characters.
- In Dumbells, it was revealed that they lived next door to the Bigheads.