Waluigi

Waluigi (Japanese: ワルイージ, Waruīji) is Luigi's lanky rival and Wario's partner. Waluigi made his debut in Mario Tennis, and since then, he has made playable appearances exclusively in the Mario franchise's spin-off titles. He makes an appearance as a playable character in all but one game in the Mario Tennisseries. He has been voiced by Charles Martinet ever since his debut. His name is a portmanteau of the Japanese words warui, meaning "bad", and Ruīji, meaning "Luigi."

Mario Tennis.
Before Mario Party 3 came out, Waluigi was debuted in the intro of Mario Tennis. Waluigi was with Wario, going to play against Mario and Luigi.