Nanno will switch schools while posing as an 11th grader and has the appearance of a young teen girl. She is also able to expose everyone's personal hypocrisies. Nanno is not human and her origins are unknown.

Nanno is a light-tanned girl of Thai descent. She has a short medium-length, bob hairstyle with bangs. Her hair is black. She always wears the school uniform of the current school she attends. In many episodes, her school uniforms will vary. Her shoe attire consists of Mary Jane shoes with buckle straps or sneakers. She usually carries a Thai school bag to school.