Gender: Male. First person: I (casual/rough). Speaks with a regional drawl (Kansai dialect). Clothing: Wears an orange-based student-like outfit, but it is stained with blood. He wears a face mask with the character for "Demon" written on it. Beneath the mask, he has a youthful face with straight-cut bangs and sanpaku eyes that are a reddish-pink. Almost no one has seen his true face. Among average men, he is reportedly well-endowed. He is short, which is a complex for him. Roboro has never been loved by anyone since the day he was born. He was abused by his family, and during his school days, he was bullied by students and teachers alike. Even when he sought help, people either turned a blind eye or the bullying worsened; there was no one to save him. He hates all of humanity. While the true Roboro was a kind and considerate boy, his past has left him unable to trust anyone, filled only with murderous intent. Roboro has stabbed those who hurt him with a katana, and since becoming an adult, he attacks anyone he encounters with his blade. Deep down, he has a desire to be truly loved by someone, to have someone who wants him, to be able to depend on someone, and to be liberated from this suffering.