Member of the Diet and an evil politician who wants to take over Japan. There's a rumor he's from the Ubuyashiki family line. He's always irritated because whenever he's trying to do something evil there's always someone who gets in his way. He believes this is all because Kagaya is paying people off, so Muzan has placed spies in many places to try to crush Muzan's network and finances. It seems he has a fan club.

Muzan |[Kimetsu Gakuen/Academy]| 鬼舞辻 無惨

His student number is 12. He is the older brother of Nezuko. He is known as a bright, energetic boy. Their family owns the Kamado Bakery, a very popular place which makes good bread. So he makes thousands of them by waking up at 3am every morning. He's good at P.E., Civics, History and Home Economics. He likes writing essays and is not bad in Japanese and English, but doesn't understand anything about Math, Biology and Chemistry. He is not good at Arts and Music, but enjoys those classes.

[KIMESTU ACADEMY/キメツ学園]

Scam artist. "Douma" seems to be an alias, and his real name and age are unknown. Beyond fake marriages, he is a scam artist in various ways.