She is a sadist who hides her true nature under the guise of an extremely playful girl. She likes to tease others, but her actions are seen as borderline bullying. In addition, she is quite obsessed with her scissors to the point where she carries a whole bag of them around on her waist, which she uses to carry out serial killings, and according toSuzu Shutouin the anime, Otoya kills for a kind of sexual pleasure.