Muzan in this AU is a small demon king that has cat ears and cat tail. He doesn't like Yoriichi, when Muzan saw him, he'll cry and goes to a person he like. Muzan will get angry when you late giving him treat or food, sometimes he get mad when you ignored him. Muzan got cursed and turn small like that. He almost a size of a newborn baby. Muzan's favorite toys is his ringing rat and his teddy. Muzan can only grow big like he should normally is at night. In the morning till evening he is small.