Waluigi appears as a randomly collectible trophy: The L on his hat also changes to yellow in Brawl, just like Waluigi's inverted L, but its orientation is not flipped. Luigi possesses a black and purple color swap which gives him a similar appearance to Waluigi. He is voiced by Charles Martinet, who also voices Mario, Luigi and Wario. However, if opponents are careless, he can be quite deadly. He is relatively easy to avoid on the stage, as he can be avoided by simply jumping over him, and it can be quite easy to lure him off-stage. Unless he attacks constantly, his final attack has a pause which lasts about 3 seconds. His kicks meteor smash if the opponent is a little outside the stage.

He stomps the victim(s) multiple times before unleashing a finishing blow with his tennis racket or a kick. When summoned, he dashes at a random opponent on stage and stomps them into the ground (although he can stomp multiple opponents at once if others around are caught in the stomps). He has brown shoes (similar to Mario and Luigi's) instead of his usual orange shoes. Waluigi makes his debut as an Assist Trophy in Super Smash Bros. Waluigi as an Assist Trophy attacking in Brawl. The tennis racket he is holding has retained its design from Mario Tennis.

His appearance has slightly changed in Brawl, as Waluigi has orange shoes in the Mario games, not brown although his orange shoes were retained in SSB4 and Ultimate. His finishing move either involves kicking the player or hitting the player with his tennis racket. He will try to stomp players into the ground however, Waluigi has never done this in any other game, though several games such as Mario Party 3 have shown that he has very powerful legs (in the aforementioned game, he knocks out the usually highly durable Bowser with a single kick). In Brawl, SSB4, and Ultimate, Waluigi appears as an Assist Trophy wielding his tennis racket, which is a reference to his first appearance in Mario Tennis. Waluigi was created by Camelot's Fumihide Aoki and is voiced by Charles Martinet, like Wario and both Mario Bros. Unlike Luigi's green hat and shirt, Waluigi has a purple shirt and hat with black overalls and orange elf-like shoes, while his О“ symbol is yellow. Along with this, Waluigi has a hat and gloves with a 'О“' gamma symbol, which is similar to Wario's 'W', which is also an inverse or an upside-down 'M'. He is Luigi's 'evil' rival, in the same way that Wario is Mario's. Waluigi made his first appearance in Mario Tennis and like Princess Daisy, he has appeared in nearly every Mario spin-off since serving as Wario's partner-in-crime and best friend (although oddly, he has never appeared in a Wario game). The racket seen in the image is the same one used by Waluigi in Brawl, Smash 4 and Ultimate. Official artwork of Waluigi from the N64 version of Mario Tennis.

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