Rob is the main antagonist and a supporting character in The Amazing World of Gumball. He was formerly a minor background student at Elmore Junior High and was first seen in a poster of the show posted online. Once the world became aware of his uselessness, he was sent to the Void, escaping by holding onto the back of Janice. In later seasons, he becomes the main antagonist of the show, and Gumball's arch-nemesis.