Waluigi

Waluigi is a character found in the Mario series who was made to rival Luigi. Waluigi mainly only appeared in spinoff games such as Mario Tennis and Mario Party 3. Waluigi is known to be Wario's partner ever since Waluigi made his first appearance in Mario Tennis for the Nintendo 64 and was voiced by Charles Martinet ever since. Waluigi also appeared along with Wario and Luigi in Super Mario Advance games as a palette swap of Mario.

Waluigi's hat has a letter Gamma on it, showing his rivalry with Luigi, similar to Wario who has a W on his cap, shown to be an upside down M. Waluigi wears black overalls and purple clothes.Likes causing trouble also he doesn't give credit to Mario for completing his adventures.

The details of Waluigi's past are unclear since he has no confirmed background, although he was evidently been antagonizing the Mario Bros., especially Luigi, for quite some time before his debut as seen in the opening of Mario Tennis, where he and Luigi confront each other.