I think I'm on Aarom11's side with Waluigi, he's perfect for fanfics that involve Wario; Wario's a muscular fatso and Waluigi's a brittle stick. Throw them together and...
Wario: Hey stupid, pass me that mayonnaise.
Waluigi: Who are you calling stupid, you fatty. Get it yourself.
Wario: I'm going to kill you if you don't give me that freakin mayonnaise right now!!!
Waluigi: Oh my, Wario might beat me up! Or worse, fall on me!
Wario: *falls on Waluigi*
Waluigi: *Crack* Aaaaugh, my bones that I don't know the proper names of!