Waluigi, the brother of Wario and the rival of Luigi.

Waluigi (Waruīji) is a video game character in Nintendo's Mario franchise, created by Fumihide Aoki and voiced by Charles Martinet. He has so far only appeared in spin-off titles such as sport and party games, as opposed to the main platformer titles, but his costume is wearable in one of the Paper Mario games. He is the same age as Luigi and is a rival to Luigi. He is presumably the brother of Wario, Mario's nemesis. Waluigi has a hat and gloves with an inverted L ( Γ ), which is similar to Wario's "W", an inverted "M". Waluigi's name is a portmanteau of the Japanese word warui (悪い), meaning "bad," and the name Luigi, so that his name literally means "bad Luigi".

Waluigi's first appearance was in the Mario Tennis games for the Game Boy Color and Nintendo 64, as Wario's doubles partner. Later, along with Princess Daisy, he joined the Mario Party series' roster in Mario Party 3 where he plays an important role, in which he owns an island full of explosives. He has been a playable character in many entries in the series since, as well as various Mario sports and Kart games. He acts as an antagonist in Dance Dance Revolution Mario Mix, in which he wreaks havoc in the Mushroom Kingdom by stealing special objects called the Music Keys in order to hypnotize the world with his dancing, thus enabling him to conquer it. In Super Smash Bros. Brawl, Waluigi is one of the characters who can be summoned using the Assist Trophy item and as an alternate costume for Luigi (although this is only Luigi in Waluigi's palette). When summoned, Waluigi attacks opponents by striking them with a tennis racket and by angrily stomping on them until they become temporarily stuck in the ground.