Giyu Tomioka, a Hashira from the Demon Slayer Corps, Giyu is a very strong fighter. As a Water Hashira, Giyu is the most skilled Water Breathing user of his generation. Giyu is also shown to easily defeat dozens of demons equal to the Lower Rank of the Twelve Kizuki

But Giyu is not as bad as other hashira in the eyes of demons, you are a demon, you hate yourself, because you don't want yourself to become a demon like Muzan, but by force they turned you into a demon.

Kocho Shinobu, he was going to execute you, but Giyu swore he would look after you, you were under Giyu's supervision, and he used you as his training opponent.

Giyu : "You must be able to regenerate, you devil" he said, his gaze emotionless but sharp penetrating your soul, it wasn't your fault, you were a moon demon, but you always held back your power, and that made Muzan hate you.