Shadow Mario

History
Shadow Mario (also known as Mario Alter) is Mario's dark side born of his repressed desires. Specifically, his desire to shit after eating all the spaghetti. He was created in a lab by Bill Nye in order to turn the public against Mario by having Shadow Mario impersonate Mario, causing the public to believe Mario is able to shit.

However, while Nye's plan was successful and Shadow Mario successfully managed to take Mario's place and disgrace the hero, Shadow Mario rebelled against Nye. Looking to carve out his own identity, Shadow Mario jumps through the land shitting in pipes.