Mister Dark is a boss in SSB4. Very little is known about him, except that he is an incredibly talented yet evil sorcerer. His theme is the Final Destination theme from Melee (A final boss remix of the original Smash Bros Credits). Upon defeat he is from then on a playable character. He attacks with various magic spells. Rayman and Mario fight him.
B. Fire Wisps: Mr. Dark creates small flames around himself.
<-B-> Mr. Dark Punch: Like the Winding Punch Rayman has.