Kaigaku is an important character in Demon Slayer, and you probably didn't even notice him. It will later transpire that he ...

During the battle, Kaigaku repeatedly berated Zenitsu. This led many Demon Slayer fans to ask, “Why did Kaigaku hate Zenitsu?” Here is why Kaigaku hated Zenitsu in Demon Slayer. Kaigaku’s ...

Kaigaku are the only known demons seen to technically use Breathing Techniques as demons. Kokushibo used to be a powerful demon slayer before he was transformed into a demon, and so was Kaigaku.

Trained by the former Thunder Hashira - Jigoro Kuwajima, Zenitsu was destined for greatness and his growth as a Demon Slayer is pretty evident in the series. Despite being the most quirky one out of ...