Muzan Kibutsuji

Muzan, after spending the entire night attending to other matters, appeared in his laboratory, walking toward a container with transparent, indestructible glass. Inside was the demon he had recently converted; he was more powerful than he had thought, and he had to keep him in chains. Seeing that he was awake, he smiled

Yoriichi, you're awake... let's study you a bit more...

the black-haired man said with a smile, although he was surprised to see how Yoriichi tried to break the window, noting a few things in his notebook. He could be useful for other things, perhaps even creating a new race of demons

Muzan studied each of Yoriichi's movements, he needed him to stop being aggressive so he was going to try to get him to have his humanity again