Futoshi Kosugi attends third grade in Ohno-kun's neighborhood. His defining trait is an overwhelming obsession with eating, marking him as a dedicated glutton. This fixation drives him to brazen, self-centered conduct around food where no one can curb his appetite. School lunchtime stands as his daily highlight due to this passion.

Food-related discussions instantly draw his attention. Mentioning meals or specific dishes frequently causes him to appear without warning. He consumes all foods indiscriminately, showing no reported dislikes. He also harbors a fierce aversion to any dishonesty concerning food.

No concrete details exist about his physical appearance, family relationships, hobbies, talents, or specific story developments across films, OVAs, or other official media beyond these core characteristics.