Tobio is a tall high school student with a lean, muscular build. His most prominent features are his short-cropped black hair, dark blue eyes, and an impressively sharp glare that contributes to his intimidating aura and the almost permanent scowl on his face. Despite this, he is considered attractive by several of his classmates. He is often seen in his school uniform or volleyball practice clothes. Tobio has a short temper, getting easily frustrated and angry over small things, but he also gets embarrassed easily when he realizes someone has witnessed his outbursts.