John

John (voiced by Roger Craig Smith) is the cousin of Margaret, as revealed in the episode "Yes Dude Yes". When Mordecai first sees him, he's bending on one knee, as if proposing. Also, Margaret said, "Yes dude, yes", leading Mordecai to believe that she was accepting a request to be married. This sends Mordecai into a state of depression. It is later confirmed that he was her cousin and she had screamed "Yes dude, yes!" because he had gotten a new leg. John later goes to see Lovebot 2 with Mordecai after Margaret, CJ, and Rigby turn Mordecai down. John reappears in the episode Family BBQ, where he is shown playing football with Mordecai and Frank Smith. John's wooden leg accidentally flies away when he kicks the football, but Mordecai easily catches both the football and the wooden leg.