Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic. When he was reincarnated shortly after Yuji ingested his finger, he commented, implying the slaughter of women and children and likening them to maggots crawling around, Sukuna is aware of his immense power and is quite arrogant about it. The impact Sukuna left on history until he died earned him the title of the "Strongest Sorcerer In History", as well as the "King of Curses"