I've said this before, but nobody listens. His name is "Bowser Koopa" it has been "Bowser Koopa" since the release of the original "Super Mario Bros.," it is "Bowser Koopa" in every "Mario" game, cartoon, comic, or other tie-in. He is sometimes referred to by his title, "King Koopa," and sometimes by his first name, "Bowser," but they're the same person and the same name, and both are used in the cartoons and in different games. It's not that difficult to understand.