Keirin

is a member of Hien. He is a unique Human Puppet, having a mind composed of three: Takehiko, Yūrin, and his own self, Keirin. However, Keirin's own conscience has little say in his actions, with those being decided by Kurochō. Takehiko is a separate entity himself, the human puppet once partnered with Sayuri Senju, the one who also developed the New Akatsuki alongside her. Yūrin is a rather mysterious piece of the puzzle, but she seems to be a direct half of Keirin's mind. Keirin and Kurochō have a mother-son relationship, but this is a result of the permanent Genjutsu he is put under. Keirin was originally a young resident of the Land of Yang, until he was captured by Kurochō and modified, having Takehiko's spirit imbued into him.