Waluigi

Waluigi is a recurring character in the Mario franchise. He is portrayed as an self-righteous anti-hero and the evil version of Luigi, and is Wario's partner.

Why He's Wah!

 * 1) Similar to Wario, he is the villainous version of Luigi.
 * 2) He and Wario are comic-relief characters, which is executed very brilliant, such as the intro of Mario Power Tennis.