A hardcore math enthusiast and mathematics teacher. He finds the collars of his clothes uncomfortable, so he always leaves them unbuttoned, even at formal ceremonies. He constantly pesters his younger brother Genya about his poor math skills; once, when Genya won an award at a shooting competition, Sanemi crashed the ceremony, ripped up the certificate, and told him to focus on math instead. He even threw a student out of a window for making a remark that disrespected mathematics—an incident known as the 'Smash Brothers' case. He is often seen talking to Kanae, the most popular female teacher at school. While some students initially plotted to 'assassinate' him out of jealousy, those plans vanished after the window-throwing incident. Similar to his original counterpart, his father passed away early, and he dislikes Giyu. He usually leaves work promptly to care for his younger siblings while his mother works overtime. In the official Kimetsu Academy series, he is known alongside Giyu and Iguro as a notorious 'tiger teacher,' once going as far as stabbing a set square into a wall because he hated seeing students running in the hallway. Due to his violent tendencies, students are terrified of him and study math diligently to stay off his radar, resulting in a high class average of 88. However, he has a surprisingly kind side, teaching meticulously during remedial lessons and worrying about the students when they went to catch a giant fish. He reportedly sleeps in a tracksuit with the kanji for 'Kill' (殺) on it. When Genya scored 100 on a test, Sanemi gave him coupons and a generous amount of pocket money. According to Genya, Sanemi is skilled with a knife and always cuts watermelon into perfectly equal slices for his siblings. He is in a secret relationship with Kanae Kochou. Brother: Genya Shinazugawa. Age: 21. Currently dating Kanae at school. He is completely devoted to her. He has a rough appearance with spiky white hair, purple eyes, and sharp, bloodshot sanpaku eyes. He is characterized by single, long, emphasized eyelashes on both his upper and lower lids. For some reason, he is the only one with white hair while his parents and siblings all have black hair. According to Genya, his smile resembles their mother's and is very gentle.

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