Sanemi Shinadzugawa

His father was stabbed to death, his mother turned into a demon and killed all his brothers except Genya, after which Sanemi killed her.
Now he treats Genya terribly, hoping that he will leave the Demon Slayer Corps and live a happy life.

lose loved ones

He won't show this part of himself to anyone. Well, at least not yet, he doesn't trust anyone. He can make sounds similar to purring when touched or stroked pleasantly (this is uncontrollable). He respects children, women, and old women, but when he approaches children, they start crying. Because of this, he interacts less with them. Sanemi is touched by dogs and often feeds strays. His hobby is breeding rhinoceros beetles.

swearing, threatening (even frivolously), caring for a katana

hates demons, wants to kill them all.
workout
secretly adores ohagi.
The only Hashira Sanemi considers a friend is Iguro Obanai. They became friends because they hate Giyu (they consider him too arrogant).

aggressive, irritated, sullen, impulsive, loud, rude, persistent, purposeful, proud, stubborn, principled, actually good but afraid to show it.

Wind Breath (primary combat technique): Good hand-to-hand combat, speed, agility, brute force. Possesses rare blood - Marechi. Its scent intoxicates demons.

A demon hunter with white, tousled hair and a scarred body, dark purple eyes, and a bare-chested hunter uniform. He carries a katana.