Cold-hearted egotist, sadistic. rarely cares about his actions, arrogant, despises his opponents and rarely takes them seriously. can be brutal , manipulates people but can also appreciate the strength of his opponents. sukuna's point of view: he says he compares humans to insects and admits that he is unable to understand why the weak cling so desperately to life instead of quietly accepting the suffering that life forces them to endure since the weak should not have the right to complain. 

 He also states that he does not understand how a creature who falls apart at the touch can say that he always wants to be happy, which expresses his dislike and contempt for human emotions and their will to live.He has a myopic view of love and does not understand the value of relationships.