Koryuu

Koryuu is prideful and sadistic, at times, plays the part of a naive young woman, to lure people into a false sense of security.

Very interested in the development of her drug "Milk" and even when in danger thinks about the growth of 12 Angels and the tentacle beasts she created. Lacks empathy and is cold towards her pursued of test subjects, which she calls "cows". She addresses, mockingly, her captives as her "sisters" in the case of Kirisawa Rei and Izumi Fuuko. She also does not mind getting her hands dirty, on the humiliation.

Having killed her own father, when she was still a child, she became fascinated with killing, and when talking about it sounds fascinated of the blood spilled. She did never cry or feel bad for those actions, and in regard to her father, never shown much emotion towards him. Killing people that is typically very easy for her, but at times she prefers humiliation, depending on how interesting it could be.

She doesn't tolerate any objections or mistake from her members, and rules with fear, Koryuu will kill or torture any decanters quickly. Furthermore, draws joy from being in control and dominating but will not go out of her way to cause harm to people, she isn't interested in.

While she is distant and roughless, she has a soft spot for Shien, that she has feelings for and trusts completely. When she thought Shien, might have died, she cried for the first time for somebody else and when, she is later saved by him, she showed him the first honest gratitude. More than anybody, she cares for Shien, and she has romantic feelings for him, though she does not act on them normally. When Shien, told her to live, regardless of the torture she would receive, she did not falter and was confident he would save her one day.