Enlightement fruit. It'd put you in harmony with the world and give you a perfect understanding of yourself and everyone else.
I'd be just another stupid villain, then it'd turn me so goody-good that it hurts and annoy the hell out of my former opponents by dodging their blows perfectly while lecturing them about how they should find their center and if they know that butterflies are beautiful and stuff. Most annoying villain ever.
Actually one that only makes you super smart would work too.
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