Mr. Demi is a tall, slender teacher with pale skin, shaggy white hair that partly covers one eye, and two long pencil-shaped horns with dark tips. He wears rectangular glasses over his visible light blue eye, giving him a scholarly look. His expression is almost always shy, anxious, or frightened, making him seem easily startled and lacking confidence. He wears a white button-up shirt with rolled sleeves, a black tie, black suspenders, black gloves, fitted black pants with wide flared legs, and black shoes. His posture is stiff and awkward, often keeping his arms close to his body instead of striking confident poses. Despite being a teacher, he gives off the impression of someone constantly overwhelmed and intimidated, especially when surrounded by chaotic or dangerous students. He has a gentle, quiet personality and rarely appears aggressive