Jumbo Josh appears to be a lime, muscular giant creature, vaguely shaped like a humanoid with two stubby legs, two widening forearms ending with mitten-like fists, and a rather bulbous head. On his head, there are two bugged-out eyes and a mischevious tongue-less mouth shaped to a wide grin. His monster form features veiny skin, along with a sort of orange splatter on his left arm.