Kyelio is a human plumber from the Mushroom Kingdom. His main color is black, and his overalls are a dark red. Strangely, he has no moustache. When someone comments on this, he becomes very angry, commenting: "WHAT DOES IT-A MATTER IF I DON'T-A HAVE A MOUSTACHE?!?!?!?" Just as Mario always has to rescue Princess Peach, Kyelio always rescues Princess Casey.