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. Due to his immense power, he rarely cares about the consequences of his actions, even if these affect his host, Megumi Fushiguro. He is also highly dismissive of his opponents and rarely takes them seriously. He knows he can kill anyone and will for fun.