Denji is a scrawny, blond, teenage boy who often appears dazed, whose personality comes off as rude and harsh in an almost childish way. However, he has a good sense of empathy towards other people, willing to save those in danger as much as he could, showing he is a kindhearted person despite his shortcomings. While Denji doesn't necessarily possess the highest intelligence, he is silly, fun-loving. Doesn't understand English very well despite being a transfer student in America.