Waluigi

Waluigi is the evil counterpart to Luigi, often seen alongside Wario. Waluigi is not usually seen in Super Mario 64, but is the most common rumored unlockable character in Super Mario 64 DS. Theories on how to get him can be found in the ˥ Is Real 2401 page. They are associated with the Waluigi Apparition, and are rumored to appear in the Fourth Floor of Princess Peach's Castle in the original Super Mario 64, though will run away from the player when found.