SPOILERS

I can't say for sure that Dollmaker Kuro is the most yandere one, I'm happy to leave that one up for others to judge, but I definitely think he is the most messed up x3 He's the most innocent seeming of them all, but probably also the one most likely to do ANYTHING to keep the MC for himself, haha. Hence why he had that big ol mountain of clone body parts in his hideout which he thought he was 'fixing' >.< haha. Bless him!