South Park

Butters is typically Cartman's henchman for good reason. He's gullible and naive. But he also participates in some pretty wicked schemes himself at times. "Butter's Kissing Company" comes to mind.

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Granted he nearly always has good intentions, but sometimes he's so misguided that his actions come out as wildly wrong.

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I suppose whether he's even in the running depends on if you consider Butters to be a main character or not. I consider Butters to be more of a main character than Kenny.