Wario

"What is a toi-let?" -Wario, Mario and Luigi: Paradise Panic Episode 2 Wario is Mario's rival and evil genius. He has a brother, Waluigi.

Relationships
Waluigi - Wario is Waluigi's brother. The two seem to be Partners in Crime, because in the early Mario and Luigi: Paradise Panic Episode 2 they planned to blow up Peach's Castle.

Bowser - Wario seems to be a friend of Bowser's because in Mario and Luigi: Paradise Panic Episode 1 they were going to team up with him.

Trivia
-While demonstrating that farting is an advantage, Wario accidently kills Waluigi. -Wario does not know what a toilet is.