Serge Tova operates as a member of the First Unit in the government agency Dorothea, dedicated to regulating illegal fairy use. He sports unruly brown hair and wears the standard Dorothea uniform on missions. Serge possesses a notably carefree and talkative personality, frequently engaging in light banter and mild flirtation, especially with his colleague Klara Kysenaria. This habit often annoys Klara, though their working relationship remains effective. His relaxed demeanor stands in contrast to the more serious attitudes of other unit members. On operations, Serge functions as a long-range sniper. His fairy, Blind Tail, takes a serpentine or insect-like form, coiling around his arms to fire precise, powerful energy projectiles from its tail. He frequently partners with Klara, whose reconnaissance fairy, Tomereez, locates targets for his shots. Key missions include monitoring ruins in Dirpe with Klara, where he provided cover fire against targets like Wolfran and artificial fairies. He also helped defend the palace during the Schwarz Diese rebellion, contributing to injuring Beevee Liscar's left arm and forcing his retreat. Later, on a train mission guarding Ray Dawn, he assisted the team when Arcame's artificial fairy soldiers attacked their refuge at a ruined castle. Outside combat, Serge demonstrated camaraderie by organizing a welcoming party for Marlya Noel at a bar after her first mission. His observational skills led him to note reduced public trust in artificial fairies following a security incident at the Rondacia Palace, remarking that the kingdom's vulnerability could lead to significant instability if war occurred.