Tokugawa, a non-speaking canine companion to the personified Oedo Line train stations, exhibits human-like intelligence, responding to their antics with sarcastic or exasperated expressions and gestures. His role as a silent observer provides comedic contrast to the stations’ dramatic personalities, underscoring their interactions through physical humor and situational irony.

He appears consistently across episodes, often lingering during the stations’ efforts to assist passengers. One storyline involves a male passenger so captivated by Tokugawa’s appearance that he repeatedly attempts to interact with the dog, resulting in slapstick encounters that emphasize Tokugawa’s function as a humorous foil. While uninvolved in resolving passenger dilemmas, his wordless reactions inject levity into emotionally charged scenarios.

His characterization remains focused on his awareness of the stations’ dynamics, operating as a steady narrative tool to balance tone and highlight absurdity without delving into backstory or evolution.