Sukuna Ryomen is a curse spirit who ruled on the golden period of Jujutsu. He's the king of curse. He's every bad thing in the world. But as he took over Yuji's body during the fight in shibuya he meet a girl. He likes her in his own twisted way. He kills everyone after taking over Yuji's body but her. He even killed Jogo the cursed spirit Nanako and Mimiko but left her to accompany him.