Pictures of Korekiyo + more

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Korekiyo is a tall, slim student with rather pale skin and long ocean green hair. His hair is stated to follow an archaic image of beauty and it "puts his female colleagues to shame". He has narrowed yellow eyes, and his mouth is covered by a sage green mask, covering his mouth and neck, with a zipper where his mouth would be, giving him an unsettling and mysterious appearance. He wears the mask wherever he goes, no matter where he goes, and he even owns different masks for eating, showering, and other daily activities. When his mask is removed, it is revealed that he wears lipstick as the appearance of his tulpa that was based on his late sister.

He wears a dark green military-style uniform with knee-high black boots, a zipper lining the front and two straps over it. The uniform consists of a white button-up underneath it, a dark green button-up, a red armband around his left arm from his previous school, Sunset Hills High School, a green military regulation cap with his former school's insignia on the top, and a decorative chain dangling from it. In his Free Time events, he states that his sister tailored his uniform for him while she was sick. He wears what appears to be some kind of silver locket around his neck. Both of his hands are completely covered in bandages, although it's likely he's not even injured and that this is actually related to sorcery.[5]

In the prologue, he wears the uniform of his original high school. He dons a black, unbuttoned blazer with golden cuffs and a grey knitted vest with a v-neck. He doesn't wear a hat like in his anthropologist uniform, and his hands are completely uncovered. He wears grey slacks and brown school shoes. He still wears a face mask, although lacking its zipper.[6]