
Dimentio is one of Count Bleck's minions. He is the tertiary, later true main antagonist of Super Paper Mario. He battles Mario and his allies several times during their quest to stop the Chaos Heart and the Void. Like Mario and Mimi, he can flip between dimensions, but he can also manipulate them (an ability he shares with Merloo) and controls Dimension D, which he designed. Skilled in duplication, teleportation, and invisibility, Dimentio is initially one of the four main minions of Count Bleck (the central antagonist of the game), along with O'Chunks, Mimi, and Nastasia. However, over the course of the game, Dimentio eventually reveals himself to be the real villain, using his former master merely as a way to further his plans to obtain the Chaos Heart and use its power for his own agenda. He has another form known as Super Dimentio, which serves as the final boss in the game. His theme is called "Dimentio, Charming Magician" and his battle theme is called "It's Showtime".
His name is derived from the words "dimension" and "dementia".