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|Previous Affiliation||Gold Clan|
|Previous Base of Operations||Nanakamado Chemotherapy Research Center|
|Novel Debut||K SIDE:RED|
Kōshi Mizuchi (御槌高志, Mizuchi Kōshi) is the a former Clansman of the Gold Clan, having worked as a doctor with the enhanced ability of regeneration.
Mizuchi is an aging man with slicked back, gray hair and colorless eyes; he lacks the normal irises and pupils in his eyes.
Mizuchi is an ambitious, manipulative, brutal, intelligent, ultimately cruel man who goes to great lengths to meet his own goals. Due to the contents of SIDE RED, it can be inferred that neither the age, sex, or background of a person will stop him from doing whatever he has to do in order to achieve something.
He's also a very curious man, fascinated by the concept of a person going further than what is already thought to be their limit, a trait developed thanks to this discontent with realizing that the Gold King's power has already pushed him to his own limit with his talent.
A Clansman of the Gold King, Mizuchi was left discontent with the realization that his abilities were at their limit, and he could do nothing better than regenerating himself and others. However, he later began conducting brutal experiments on dangerous Strains, unbeknownst to the Gold King himself, and is said to have 'destroyed their bodies', only to reconstruct and brainwash them, essentially. Three named Strains with this fate are 'Grasshopper', 'Pyrotechnic', and 'Senkouki'.
He also attempts to use Anna in his attempts to make a Strain a King, specifically the new Blue King. Thus, he burns, drowns, and chokes Anna to 'stimulate her power' and make her connect to the Slate. Every time this fails, he'll soon go back to torturing Anna, or threatening to harm Anna's aunt, Honami Kushina.
In the end, however, Mizuchi wastes his energy trying to repeatedly heal a badly burnt 'Senkouki', as the Strain fights Mikoto. Soon, 'Senkouki' is burnt from the inside out, and now a livid Mizuchi keeps yelling at Anna to come back to him, only to have his arm burnt in the process, and thrown to the floor unconscious when Rabbits apprehend him.
Powers & AbilitiesEdit
Gold Aura: As a member of the Gold Clan, Mizuchi possessed the gold aura.
Regeneration: Mizuchi's 'talent' was based on his career as a doctor, and hence he gained enhanced healing abilities and regeneration. These abilities affect both himself and others.