Makoto Nakaoka, called Makoto Aido in the manga, lives in room 1 of the Hidamari boarding house. He studies at Meijou High School alongside classmates Kasumi Kishimoto, Yusaku Takasugi, Takashi Ariyama, and Shin Mikimoto. His thick, milk-bottle-bottom glasses foster an often absent-minded and disoriented demeanor toward his surroundings and activities. He consistently addresses others with polite speech.

In the manga, he occupies a minimal role focused on humor without major engagement in the central plot, receiving limited background exploration or narrative attention. The live-action drama shifts his surname to Nakaoka and amplifies his presence in an original episode, recasting him as a prodigious student striving for medical school admission—introducing intellectual drive absent from the manga.

The anime preserves his peripheral, comedic status within the Hidamari ensemble. His character shows no significant evolution across its 48 episodes. The anime film sequel "Hiatari Ryoko! Ka - su - mi: Yume no Naka ni Kimi ga Ita" similarly adds no depth, progression, or backstory.

One documented action involves him teaching beginner skiing techniques to Keiko Seki during a school trip, marking a rare direct contribution to group activities. Across adaptations, he operates as a supporting figure supplying occasional comic relief through his distracted nature and thick glasses. His narrative purpose remains uniform: a polite but underdeveloped boarding house resident reinforcing ensemble dynamics without steering major plots.