Kohei Kakihara

A research professor who was Nijū Mensō's supervisor in Nijū Mensō's days as a scientist. Though he warns Chiko against trusting Nijū Mensō, he is actually obsessed with obtaining Nijū Mensō's legacy as a researcher and reaching the "fourth state of water". He does not care for the consequences and believes that the dangerous power of the fourth state of water will change the world, no matter how destructive it is. He also used Seiji Tamiya's research to create enhanced cybernetic bodies for himself and others, eventually changing his body in the image of Nijū Mensō.

Kakihara was the original Nijū Mensō, but Nijū Mensō's thefts began occurring at the same time and the name became attached to the young scientist while Kakihara was forgotten. He is without morals and seeks only to complete the research Nijū Mensō conducted before the war, believing the research was selfishly kept from him, and had killed many people over the years to obtain it. (Source: Wikipedia)