Hyūga Masamune, originating from the online collectible card game Touken Ranbu, is an anthropomorphized sword warrior embodying a real historical blade crafted in Japan's Edo period. As a "Touken Danshi," his core mission is protecting history from time-traveling enemies attempting to alter the past, reflecting a deep dedication to duty.

Standing 144 cm tall, he appears in media such as the theatrical trilogy *Toku Touken Ranbu: Hanamaru ~Setsugetsuka~*, engaging in communal activities including scenes depicting casual attire during seasonal events like fireworks viewings. His personality aligns with the ISTJ type, emphasizing practicality, reliability, and a strong adherence to rules. Traits of Enneagram Type 8 manifest as assertiveness, independence, and a protective stance toward allies. He prioritizes factual analysis and direct communication, sometimes displaying rigidity toward change or emotional ambiguity.

Notable quirks include a documented preference for tea and traditional Japanese sweets, adding nuance to his disciplined demeanor. Within the group dynamic, he functions as a mentor figure, leveraging combat expertise and organizational skills. His gameplay capabilities evolve across forms: Base stats prioritize mobility (29–53) and scouting (37–52). The "Toku" variant enhances leadership (31–44) and impulse (20–30). Achieving the "Kiwame" progression at level 60 significantly amplifies combat potential, with mobility peaking at 61–139 and scouting at 99–120, alongside expanded troop capacity.

His narrative role expanded in the 2022 film trilogy *Toku Touken Ranbu: Hanamaru ~Setsugetsuka~*, debuting specifically in the second installment (*Tsuki no Maki*) as one of 14 newly introduced sword warriors. Merchandise such as trading cards and acrylic collectibles (e.g., 88 x 63 mm paper folders or 8 x 6 cm acrylic cards) aligns with his inclusion in the *Setsugetsuka* theatrical releases and related exhibitions.