Makoto Nakaoka occupies room 1 at Hidamari Private Boarding House, originally introduced as Makoto Aido in the manga before his surname shifted to Nakaoka for the live-action adaptation. He sports thick, milk-bottle-style glasses and exudes a perpetually dazed aura, frequently seeming detached from his environment or ongoing actions. Interactions with housemates Kasumi, Yusaku, Takashi, and Shin unfold through courteous, measured speech and a subdued demeanor.

Within the manga, he inhabits a peripheral role, functioning chiefly as a comic foil with minimal ties to core plotlines. The live-action series diverges by dedicating an original episode to his backstory, reimagining him as a gifted medical student preparing for university entrance exams—a sharp contrast to his typically vague characterization elsewhere.

An anime skiing episode briefly subverts expectations when he displays unanticipated proficiency, competently instructing beginner skier Keiko despite his usual baffled persona. These sporadic glimpses of latent aptitude complicate his otherwise cryptic nature. Beyond these instances, subsequent films and spin-offs provide no additional exploration of his history, connections, or personal growth.