Dimentio

He was one of Count Bleck's minions. He battled the heroes several times throughout the game. After Count Bleck is defeated he attempts to kill him but Nastasia takes the hit and then he seizes the Chaos Heart for himself and transforms himself and Luigi into Super Dimentio. He banishes Count Bleck, Nastasia's unconcious form, and Tippi to his own Dimension D. Mimi and O'Chunks arrive there to tell Count Bleck they'll aways stick by him. Mario, Bowser, and Peach defeat Super Dimentio, freeing Luigi and killing Dimentio. However, Dimentio leaves behind a shadow of his power to keep controlling the Chaos Heart. Count Bleck and Tippi destroy that shadow along with the Chaos Heart when they proclaim eternal love for each other.