Chikara Ōta, a middle school student sharing classes with the main protagonists, sports a chubby build, short hair, and narrow eyes. His friendly demeanor shines through frequent interactions with classmates Adachi Shō and Kenta Kanzaki, forming a trio that indulges in humorous exchanges laced with risqué or absurd themes. Within the group, Chikara often assumes the straight-man role, countering his friends’ exaggerated antics with flustered reactions or bemused skepticism.

Tensions occasionally surface with Adachi, whose boundary-pushing jokes provoke uneasy laughter, while Kanzaki’s niche obsessions trigger puzzled frowns during their conversations. Yet Chikara’s approachable nature anchors his presence, fostering camaraderie despite these quirks.

His narrative remains rooted in school life as a supporting figure, with no supplementary media expanding his backstory or personal growth. He consistently contributes lighthearted banter to group dynamics, maintaining this role across all adaptations.

The character’s full name was formally disclosed in a Q&A segment from a special illustration book bundled with the original manga’s sixth volume, finalizing his identity within the series’ framework without altering his established interactions.