Bowser

Bowser is the leader of the Koopas and main enemy in the Mario video-game series, he is hell-bent on kidnapping Princess Peach of the mushroom kingdom, and destroying plumbers, Mario and Luigi.

Media
Bowser's first appearance was in the game Super Mario Brothers, where he was the main antagonist. He then appeared in many other Mario games, until recently being put to the side and letting his son take the spotlight. He also appeared in both Mario TV shows.