Teppei, introduced in the second season, is a reserved yet polite young man with short, dark hair, dressed in the standard high school uniform: a dark blazer, white shirt, and tie. As a classmate to the main cast, he appears across multiple episodes, contributing to plot development through conversations that delve into cultural differences and the Nagoya dialect. His interactions enrich the narrative’s exploration of school life and regional linguistics, offering nuanced insights into community dynamics while reinforcing the story’s authenticity and depth.