Fuzzy Lumpkins, because both Buttercup and Fuzzy are super strong.

Actually the Gangreen Gang is Cuppa's best villainous counterpart, because they are both associated with the color green, tend to get dirty and smelly easily, and often skip on the rules imposed by society to just do whatever it benefits them, even if it's not a good thing. (Moral Decay)

It's no wonder Buttercup crushed on Ace...

Frankly a little bit more and Cuppa could easily join their group. Heck, they're basically her if she didn't have her sisters and the Professor as moral/emotional supports.

Mojo Jojo, because he best represents the color of her black hair and green outfit.

I know many consider Ace to be Buttercup's counterpart, but I intentionally made this poll to be between these three major villains. Since both Buttercup and Fuzzy are super strong and both have short tempers, I personally think Fuzzy is Buttercup's best counterpart of these three.

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Both are tough and strong