Who do you think is the badest bad guy in the mario RPGs

Personally i think Princess Shroob (the younger) the elder is creepier but well she never actually does anything

Lord Fawful ftw!!
I HAVE CHORTLES!

seconding fawful he is funny but just pure evil in superstar saga

Sir Grodus from Paper Mario: The Thousand Year Door is whacked out of his mind. He would have killed Princess Peach for crying out loud!

Fawful.
Reason?
He has none, so why should I?

Other than him, I think Dimensio took the cake. His motives are for pure selfishness, he manipulated everyone he knew, and almost destroyed everyone and everything.