Denji is both brash and naïve as a result of being unable to have a formal education and socialize due to living in severe poverty. His personality comes off as rude and harsh in an almost childish way. However, he has a good sense of empathy. While transformed into his Chainsaw Man form, Denji becomes extremely ruthless, aggressive, bloodthirsty and sadistic. As the story progresses, it becomes more evident that Denji is emotionally damaged, and desperate to feel love and be loved by someone.