Dark Meta Knight appears only in Kirby and the Amazing Mirror. It all started when Meta Knight went to go check out the Mirror, and it copied him, creating an evil likeness of himself, Dark Meta Knight. He traps Meta Knight in the Mirror World, in which Kirby will have to rescue him. He is also a boss in Radish Ruins.
Dark Meta Knight is the dark version of Meta Knight. His cape is darker, and his sword is silver instead of gold, like Galaxia. His feet are also red, while Meta Knight's are a violet.