Makoto Aido occupies room #1 at Hidamari Private Boarding House. Throughout the main series, this character fulfills a minor role, punctuating scenes with brief, humorously unsettling moments. The original manga and anime depict no significant background or development for him.

In the live-action television drama adaptation, the character undergoes a slight divergence: renamed as Makoto Nakaoka, he becomes the focus of one episode highlighting his prodigious medical talents. This episode marks the sole instance of expanded narrative attention across official adaptations.