Super Smash Bros. Lore!

This is not official, it's some weird stuff made up by me and my friends

Mario

After the Great Battle of the Eternal War, the chief engineer of the Nine Hells (Falco) created a sentient being known only as Mario. The original intent was to create a super soldier, but Mario broke out of his containment chamber and fled into the Outer Wilds. Legends say he still lives there to this day, eating the eyeballs of his enemies. He also lost both of his hands in a tragic karting accident and is said to be responsible for the creation of the Hands.