Bowser

Bowser, also referred as Lord Bowser, King Koopa, is the primary antagonist of the Mario series and Worlds Collide and is the archenemy of Mario and the WC's. Bowser most commonly kidnaps Princess Peach, but in this series, he captures the Light Prism, George, and uses him against his own will to take over the multiverse, while being oblivious to him possibly destroying it. He is also the father of Bowser Jr.

He is the leader of the Koopa race and the Koopa Kingdom. 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.