Train Man is the central figure of a story that originated as a series of anonymous internet posts. His real name is never revealed, and he is generally understood to be a 23-year-old man living in Tokyo. He is a self-identified otaku, meaning his primary interests are in anime, manga, video games, and related paraphernalia, often shopping for these items in the Akihabara district. He works in a nondescript office job, using his computer skills to aid his coworkers, and lives with his parents. At the start of his story, he has never had a girlfriend and has no experience with dating or romance.

In terms of personality, Train Man is defined by his profound shyness, social awkwardness, and a deep lack of confidence in himself, particularly in matters of love. He feels he is undeserving of a woman's affection. This insecurity makes him prone to nervousness and self-deprecation, often turning conversations into rants about his own perceived failings. However, beneath his anxious exterior lies a fundamentally good and honest heart. His defining act of courage is intervening to protect a woman from a drunk man on a train, a situation that terrifies him but from which he does not back down. This impulsive bravery, driven by a sense of right and wrong rather than any social confidence, sets the entire narrative in motion.

His primary motivation, once the woman he saved, whom he nicknames Hermes, enters his life, is to overcome his own limitations and win her affection. He is driven by a genuine, pure-hearted desire to connect with her, but he lacks any knowledge of how to proceed. Consequently, his actions are motivated by a desperate need for guidance, which he seeks from an online community of strangers on a Japanese internet forum. He is motivated to follow their advice, leading him to change his appearance, choose date locations, and learn how to communicate, all in the hope of becoming someone worthy of Hermes.

Train Man's role in the story is that of an everyman protagonist on a transformative journey. He is the focal point through which the themes of social anxiety, the power of community, and personal growth are explored. He serves as a vessel for the hopes and vicarious dreams of the online forum members who support him, and by extension, for the audience. His struggles and small victories are the central narrative engine, turning a simple boy-meets-girl premise into a story about self-improvement and the courage to change.

His most significant relationship is with the woman he saves, Saori Aoyama, known on the forum as Hermes. She is depicted as a beautiful, sweet, and kind office worker who has become distrustful of men due to past betrayals and her parents' divorce. Their relationship is the core of the story, beginning with her gratitude and slowly developing into genuine mutual affection. Equally important is his relationship with the anonymous members of the online message board. This community, composed of other social misfits, a nurse, a shut-in, and a troubled couple, becomes his primary support system and surrogate friends. They guide his every move, celebrate his successes, and help him recover from his failures, creating a unique bond of collective investment in his romantic quest.

Throughout the narrative, Train Man undergoes significant development. He begins as a socially isolated individual, paralyzed by his own insecurities. Encouraged and advised by his online friends, he takes tangible steps to change his life. He gets a more stylish haircut, updates his wardrobe, and learns how to conduct himself on dates. He emerges from his shell, his demeanor improving as his confidence slowly grows. This internal change culminates in him finding the courage to confess his love to Hermes directly, a moment that represents the full flowering of his personal journey from a timid otaku to a man capable of honest and direct emotional expression. The story implies his transformation is not about abandoning his otaku identity but about integrating it with a newfound sense of self-worth.

Train Man possesses no superhuman or exceptional abilities. His most notable ability is a singular act of physical and moral courage when he stands up to a drunkard on the train, an act entirely out of character for him at the time. His other ability is his earnestness and his willingness to be vulnerable and seek help. He is a skilled computer user, comfortable navigating online spaces, which allows him to find and utilize the support of the forum. His primary "skill" that drives the story is not a talent but his capacity for growth and his determination to follow through on the advice he is given, ultimately reshaping his own life.