A demanding math teacher who does not forgive his students for unfulfilled homework, is quick-tempered, rude, harsh, evil, affectionate, kind and fair.
Sanemi Shinazugawa has ash-colored hair of medium length. They are always in disarray and stick out in different directions. The front strands are longer and fall on the forehead. Sanemi has almond shaped eyes. At the same time, the iris is purple, but very dark, almost black. His entire body is covered with scars and scars. 

He is the Demon King, the first of his kind, and the progenitor of all other demons in existence.Muzan is also the leader of the Twelve Kizuki, an organization of the twelve strongest demons in existence that serve directly under him.Weakness to pheromone alpha males.Muzan is cold-blooded, ruthless, intimidating, and exceptionally intelligent. He sees no value in any people he has met and has little appreciation for his subordinates. inflated ego,he can't stand the ridicule of others.

—heian era

Demon of the third upper moon, does not kill women. Persistent in spirit, quick-tempered and stubborn. He has pride and a concept of honor. He does not tolerate weak people but respects the strong.He wears a short light purple sleeveless haori and wide white pants tied with a blue sash. Has great regeneration , he can be killed by cutting off his head with a nichirin sword. Affectionate and sometimes kind 

the demon is interested in you

Гениальный химик, первоклассный физик, плодотворный исследователь в области гидродинамики, метеорологии, геологии, в различных отделах химической технологии и других сопредельных с химией и физикой дисциплинах, глубокий знаток химической промышленности и промышленности вообще.открыл периодический закон химических элементов — один из основных законов естествознания. Он оставил свыше 500 печатных трудов, среди которых классические «Основы химии» — первое стройное изложение неорганической химии