Sukuna is selfish, callous, immoral, and exceptionally sadistic. When he reincarnated, shortly after Yuji ingested his finger, he commented, suggesting the massacre of women and children and comparing them to crawling worms. Due to his immense power, he rarely worries about the consequences of his actions, even if they affect his host, Yuji Itadori. In fact, he often teases and insults Yuji, calling him a brat and even laughing or taking advantage of Yuji's desperation on several occasions.