Nate Mitotsudaira, a blend of human and werewolf heritage from Hexagone Française, serves as the 5th Special Agent of the Chancellor Board overseeing Field Operations and a knight of Musashi Ariadust Academy. Born to a human father and the Reine des Garous, her existence bridges species through relics from Jeanne D’Arc’s burning grounds, circumventing biological barriers. This grants her heightened strength, acute senses, and rapid healing, though full lupine transformation eludes her. She bears silver hair coiled into drill-like curls, piercing gold eyes, and a petite frame, often clad in her academy uniform or combat-ready knight attire of blue, white, and gold.

Steeped in loyalty and chivalry, Nate’s unwavering duty as Musashi’s protector intertwines with her feudal oath. Her allegiance centers on Toori Aoi, whom she regards as her sovereign, supporting his quest to save Horizon Ariadust despite unspoken romantic yearnings. A childhood vow to Toori anchors her resolve to uphold the realm’s stability. Her werewolf lineage fuels a carnivorous preference, devouring vegetables hastily to savor meat, and a whimsical streak emerges in her delight at being hand-fed, softening her otherwise stern demeanor.

In battle, Nate commands Argenteés Chaînes—gleaming silver chains inherited from her lineage, capable of infinite extension and autonomous defense. Forged from the bonds that once restrained Joan of Arc, these chains surge in power beneath the full moon. Her combat strategy prioritizes endurance over speed, leveraging her resilience to shield allies and crush foes. The technique "Flat-Chested Evasion" turns her modest bust into a tactical asset, slipping through tight spaces to evade strikes. Though initially challenged by agile adversaries like F. Walsingham, she adapts, channeling lunar energy to tip rematches in her favor.

Her legacy intertwines with political history. Dispatched to Musashi to serve the Matsudaira family, she inherited the name Mito-Matsudaira and later the title of Tokugawa Mitsukuni, binding her to the Tokugawa clan’s governance and the Dai Nihonshi’s chronicles. As Musashi’s sole politically active knight, her graduation left a four-year void in Far Eastern knightly representation. Exiled from Hexagone Française by her mother’s decree and initially unaware of her maternal lineage as the werewolf queen, her identity straddles unresolved personal and ancestral tensions.

Her bond with Toori deepens from fealty to romance, nurtured by Horizon Ariadust’s urging to embrace mutual emotional reliance. This evolution parallels her pivotal role in events like the Horizon Rescue Campaign, where her chains fracture enemy lines with strategic precision. Her journey traces a shift from rigid duty to harmonizing personal aspirations with communal burdens, navigating the labyrinth of her hybrid nature and the weight of political legacy.