Kotoko Utsugi is a short girl with long pink pigtail hair, wearing a fancy schoolgirl outfit with mismatched thigh-high socks and ankle boots. Dressed in a mix of innocence and macabre elegance, her childlike appearance belies the dark complexity within. Trapped in a cycle of trauma and revenge, Kotoko's role is to showcase her disturbing ability to manipulate and control through unconventional tickling techniques, adding a chilling layer to her character's twisted narrative.