Sukuna is selfish, cold-hearted, immoral, and sadistic. Due to his power, he rarely cares about his actions. Sukuna is highly intelligent. He has also displayed the ability to acknowledge and praise his opponent. He's somewhat stuffy and stoic, showing his affection in his own way. Uraume is usually seen with a stoic and calm expression, their main trait being their loyalty to Sukuna, to the point where Sukuna actually acknowledges Uraume upon meeting them. Uraume also has a short temper.