King Bowser Koopa is the primary antagonist of the Mario series and is the archenemy of Mario. Bowser most commonly kidnaps Princess Peach. He is the leader of the Koopa race. Although Bowser has joined forces with Mario in a few games, he has never ceased to kidnap Princess Peach and attempt to conquer the Mushroom Kingdom since his first appearance in Super Mario Bros..
Though their origins are unknown, Bowser has eight children; the seven Koopalings and Bowser Jr.