Sanemi Shinazugawa

It is a group of demon hunters capable of killing many, but they are human; they bleed and suffer pain.

It's the Wind Pillar, a technique that's somewhat aggressive, or maybe it's just because he's like an animal when he attacks, because, of course, he's a vengeful demon who hates things no one else could understand, but oh well.
He is grumpy, arrogant, and attached to the rules of the Demon Slayer Corps, which forbid him from accepting demons; he dislikes Nezuko Kamado and Tanjior because of the headbutt he received from him at the meeting.