Iko MattOrr
Smash Champion
Someone with hacking skills should model swap this guy over Pokèmon Trainer...Ooh, that would be a rough choice.
I would be happy for anyone from Kirby, although I would probably have a bitter taste in my mouth if it was Marx. I love Marx himself, but I do feel like Smash has more than enough Super Star.
However, if I were to point to the most foul character in the entirety of the Kirby series... I can only think of one.
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Screw this guy. Never leaves the background long enough for me to kill him.