Anko, baby. She has sexy boobies, and if her snake hits you you get paralyzed for about 3 seconds. Good Support. By the way snake isn't a sexual thing, snakes physically come out of her wrist and nom your face.

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Shi-zune. She spits poison that cannot be dodged, if you dodged with the substitution you'll dodge right back into it. AND it poisons you.

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Kidomaru. Kidomaru is my favorite, he shoots spider webs and does a sstunning affet if it hits, kinda like the gaurd break. You get hit by him, you usually just up and get killed there if you have low health

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Tayuya. Now, this one I'm not sure, if she hits you; you lose chakra. But that's kinda it... I haven't really used her enough to say she's op but I'd consider a bit above not op.