Metal Luigi

Metal Luigi is a metal counterpart of Luigi. In Super Smash Bros. Melee, he appears in Adventure Mode, alongside Metal Mario once the player has unlocked Luigi, who only appear together as the Metal Bros. Metal Luigi makes the battle harder as, instead of battling one iron brother, the player has to battle two, who gang up on the player. He is still heavier than the normal Luigi. Luigi can also become Metal Luigi in any battle, if a Metal Box falls down. Metal Luigi also appears in various Mario Party games when Luigi uses a Metal Shroom item. He will become invincible to most other Orbs on the board.

Trivia

 * In Super Smash Bros. Brawl the Metal Box appears allowing the player to be Metal alot like Metal Mario or Metal Luigi.