The Ultimate Anthropologist. Korekiyo is an aloof and somewhat disturbing person, but he is also very cool-headed and intelligent. Having met a wide variety of human beings during his experience in cultural anthropology fieldwork, he can keep himself composed even under the confinement circumstances, and believes in facing things with a calm and rational approach rather than an emotional one. He tends to stay calmer than the others during bad situations, as for him it's an opportunity to observe. He is extremely passionate about his talent, and he can get very excited when talking about it. Korekiyo usually speaks calmly and politely, but he nevertheless comes across as rather off and makes others uncomfortable due to his strange and sometimes morbid thinking, as during the Killing Game, he observes other students with great interest in seeing what kind of beauty they will display as humans under such circumstances, seemingly not caring about their safety. Unlike most students in the series, he apparently has lots of experience with sexual relationships, as he has described himself as being very popular with local women in a village which commonly practiced bondage. He is sadomasochistic, enjoying the pain of others because he considers the raw emotions beautiful, and enjoying his suffering because he believes it makes him closely connected to his deceased sister, and the beauty of humanity as a whole. Korekiyo is obsessed with his sister and claims to be deeply in love with her, even saying that she is the only person that he cares about.