Mataro Tamada attends Y Academy as a core member of the YSP Club, dedicated to investigating supernatural threats like Onryo and alien forces. Serving as the club's detective, he applies sharp deductive skills despite occasional judgment lapses. Uniquely among peers, he comes from an ordinary human lineage with no innate supernatural links. His previous life concluded when a meteorite bearing the alien Tidas fatally struck him, triggering his reincarnation into his current existence.

Initially without powers, he later unlocks two Yo-kai Hero forms: Shining Boy, fueled by his superhero fandom, and T-Dine, activated via his bond with Tidas. This evolution shifts him from observer to frontline fighter, placing his hero forms among the club's most potent—second only to Jinpei Jiba's advanced transformations.

He repeatedly steers pivotal events: single-handedly defeating Ghost Egg when teammates falter, then leveraging his abilities to lift and maneuver a damaged anti-black hole missile into Mazera's maw with allied support. His story culminates in a departure for America, celebrated by a YSP Club farewell gathering.

An avid enthusiast, he consistently indulges his passion for superhero films and tokusatsu genres.