Mordecai was the one of two main protagonists of Regular Show. He made his debut in the non-canon short "2 in the AM PM" as a human cashier, who then morphs into a prototype Mordecai-like character with a fanny pack. He later makes his first official appearance in the Pilot episode. Mordecai is voiced by the show's creator, J.G. Quintel.
After the dramatic ending with Pops' defeat over Anti-Pops, in which he sacrifices himself to save the universe, Mordecai finally parts ways with Rigby, and he becomes an abstract artist, marries a bat-like girl named Stef, who he meets at a gallery and has 3 children with her.