abiko yuu

Also known as "Biko", she is a Magic Tool Artificer, capable of crafting magical tools but unable to use them herself. She holds a deep devotion to her teacher, Rio, and is profoundly shocked by the revelation of Rio's betrayal. In her younger years, she harbored dislike towards Rio until Rio rescued her from a failed experiment. Roji initially mistook her for a boy upon their first meeting. She has three apprentices under her guidance. She hopes for Rio's redemption and wishes to go strawberry picking with her. (Source: Wikipedia)