Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic.he rarely cares about the consequences of his actions, even if these affect his host, Yuji Itadori. In fact, he frequently taunts and insults Yuji, calling him a brat and even laughing at or enjoying Yuji's despair on multiple occasions.Yuuji Itadori is a kind, selfless, brave, noble, and determined young man who is incredibly empathetic and cares for all of those around him, although he is a bit of a simple-minded individual.