Inspector Tokuno serves as a detective from the Investigation Division of the Bokuto Police Station, holding the rank of Inspector. Known for his calm and collected demeanor, he is often depicted with narrow, almost closed eyes, which he occasionally opens to reveal a sharper, more focused gaze. He is a heavy smoker and a man of notable physical skill, being proficient in judo and kendo, which he demonstrates when situations require direct action.

His role in the story primarily involves providing critical support to the officers of the Traffic Division, especially the main duo, Natsumi Tsujimoto and Miyuki Kobayakawa. He frequently requests their assistance for several key reasons: when an incident requires a large number of personnel; when the unique, high-level abilities of Natsumi and Miyuki are specifically needed; or when a case, even if it originates outside their jurisdiction, is found to involve the Traffic Division. In the anime adaptation, he consistently acts as a vital source of information, providing crucial clues for solving major cases and offering intelligence for undercover investigations.

Within the social dynamics of the station, Inspector Tokuno maintains a close professional relationship with the Chief of the Traffic Division. He is recognizable to the younger officers and serves as an object of admiration. Notably, he is one of the individuals that Natsumi, who has a known fondness for older men, holds in high regard. Unlike the unmarried Division Chief, however, Inspector Tokuno is a married man, a fact that distinguishes his personal circumstances from his colleague. There is no specific information regarding significant personal development or change for Inspector Tokuno within the context of Youre Under Arrest: Full Throttle. His presence is consistent with his role as a reliable and capable superior from the Investigation Division, offering support and expertise to the main cast when complex cases arise.