Principal Shinonome leads Tokisadame High School as its principal. The shared surname and official media references imply kinship with Hakase Shinonome and Nano Shinonome, though their precise relationship remains undefined.

His defining physical trait is complete, permanent baldness, which causes self-consciousness and leads him to conceal it with a toupee. He consistently wears a black suit with a white shirt and Windsor-knotted tie. An incident involving a deer revealed he also dons a vest beneath his suit, but its inclusion in daily attire is unconfirmed.

Rational and typically calm, he assesses situations logically, such as during the deer confrontation when he acknowledged repeated statue climbing wouldn’t ensure victory. He attempts humor through puns and outdated jokes, though these rarely land with students. His composure fractures when discussing hair loss or job security, particularly concerning Vice Principal Kousuke Oura.

Professionally, he endures a contentious dynamic with Vice Principal Oura, who torments him and whom he suspects of plotting to usurp his position. His interactions with teacher Manabu Takasaki appear more supportive, evidenced by encouraging Takasaki’s vigorous push-ups, though his stance on Takasaki’s eccentricities is unknown.

A deer encounter on school grounds unexpectedly unveiled his hidden physical capability: he wrestled the animal and executed a suplex, revealing a facet beyond his administrative role.