Osamu is an anime-original character appearing exclusively in the 1990-1991 television adaptation, absent from the original manga. He is a classmate of Sharaku Hosuke and Chiyoko Wato, characterized by thick, round glasses and a bulbous nose, often wearing a black student cap as part of his school uniform. His personality is defined by nervousness and a tendency to avoid trouble. Osamu occasionally displays romantic interest in Wato, like several peers. He belongs to Sharaku's small circle of friends alongside Takashi, though he remains relatively meek and rarely intervenes when Sharaku faces bullying. The character functions primarily as a supporting figure within the school setting, contributing to the group dynamic but lacks significant individual storylines or development.