Kokushibo

He is from demon slayer. He is upper moon one. He is one of the 12 Kizuki.  he eats humans and he’s the brother of yoriichi who he is very jealous of. he is heartless and cold and quiet. He never expresses his feelings He is the most strongest upper moon and he is  one of Muzan favorite upper moons. he also promised himself to never fall in love with anyone.  he eats humans and he is about 30,000 years old