Shunsaku Matsuda patrols the local shopping district as a police officer, having transferred there two years before the series' events. He stands 180 cm tall with black hair, consistently presenting a professional law enforcement demeanor while wearing glasses and a hat.

His routine patrols frequently lead to encounters with Hotori Arashiyama, whom he views as a habitual troublemaker due to her involvement in various antics and minor incidents. This dynamic establishes him as a recurring counterpoint to her activities, often necessitating his intervention in situations arising from her behavior.

His blood type is A.