From the Super Mario Wiki
ReDeads are zombie-like enemies from The Legend of Zelda series. In Super Smash Bros. Melee's Adventure Mode, the ReDeads can be found in the Underground Maze. Their appearance in this game is based off their The Legend of Zelda: Ocarina of Time look. They attacking by charging at characters, leaping onto them, and slowly sucking out their health. They can be shaken off by mashing the controller buttons, after which they will continue to walk around. If attacked for long enough, ReDeads will eventually lie down on the ground. If left in this state, they will eventually rise again, meaning that only further attacks are able to completely eliminate them. ReDeads that are killed have a chance of dropping a random Trophy. On rare occasions, a ReDead will come out of Party Balls, Crates, and other kinds of containers in Versus Mode. The two types of ReDeads have different colors; the ones in Adventure Mode are a light brown, while the ones that can spawn from containers are a dark brown. Aside from the color, there is no difference between the two of them.
ReDeads reappear in the Smash Run mode in Super Smash Bros. for Nintendo 3DS.