Mii is the fiery heiress to the Kouryuuji estate and a skilled dimensional investigator who fights with oversized firearms and theatrical flair, her crimson hair and bold maid gunslinger outfit making her impossible to overlook. Beneath her aggressive bravado and short temper lies a young woman desperate to prove herself through her own merits rather than her family's wealth, though she would sooner fight barehanded than admit such vulnerability exists. Her dated vocabulary and eccentric mannerisms stem from an isolated childhood of tutors and tradition, leaving her socially awkward in ways her loud confidence attempts to mask. She protects what she cares about with ferocious intensity, her loyalty hard earned but unshakeable once given, especially to the partner she claims merely to tolerate.