Taihei Tenka stands as a classmate and close friend to Etsuko "Ecchan" Sarutobi. He is a steadfast member of the core group alongside Ecchan and Miko, regularly joining their daily adventures and school activities. His roots in the community are established through his family's ownership of a local barbershop. Taihei's younger brother, Kurihira, occasionally appears in group-related stories, embodying the playfully bothersome traits of a younger sibling.

Functioning as a grounded counterpart to Ecchan's supernatural abilities, Taihei lacks ninja powers or extraordinary skills. Instead, he offers steady companionship. His interactions often involve assisting Ecchan and Miko in navigating everyday challenges, whether stemming from school events, family matters, or neighborhood incidents. He shares a friendly rapport with Ecchan's talking dog, Buku, and actively participates in scenarios driven by Buku's antics or animal communication abilities.

Specific episodes showcase Taihei's role within the group, highlighting his collaboration during school festivals, sports days, or community projects. He appears in narratives focused on helping classmates' families, such as organizing birthday celebrations for a single father. Taihei's presence contributes to the series' mix of comedic and occasional dramatic tones. His character remains consistent throughout the original anime and manga continuity, maintaining his supportive function without significant development or an independent narrative arc. Taihei remains exclusively within this original continuity, with no appearances in other media like movies, OVAs, or spin-offs.