Maria Magdalene Dietrich hails from Karlsland, a nation defined by rigid order and strong military traditions. She flies as a witch in the League of Nations Air Forces Aviation Magic Band Luminous Witches, a non-combat unit focused on boosting morale through aerial performances and music, not frontline warfare. Her nocturnal familiar, Flocke, grants her excellent night vision but causes a chronic struggle with mornings. This often leaves her visibly fatigued, frequently yawning or napping during the day.

Before joining the Luminous Witches, she was deployed to the African theatre. There, she rescued an unidentified "foxy guy" lost in the desert, an act that directly resulted in her promotion to her current rank. Dietrich later regards this advancement as unearned, merely a windfall rather than a true reflection of her capabilities.

Within the Luminous Witches, Dietrich handles vocals and designs complex aerobatic maneuvers. She approaches rehearsals with meticulous attention to detail and strives for perfection, demonstrating significant technical expertise in choreographing the group's aerial routines. This dedication sharply contrasts with her deep-seated insecurities. She experiences imposter syndrome, feeling internally inadequate despite her outward competence. This becomes evident during a conflict with fellow member Mana, where Dietrich confesses that while she can devise intricate maneuvers, she perceives herself as too weak to execute them personally. She openly questions the validity of her rank, attributing it solely to the desert rescue rather than sustained merit.

Her personality blends a soft-spoken demeanor with the formality typical of her Karlsland heritage, resulting in a reserved yet disciplined presence within the group. Her persistent struggle with self-doubt regarding her abilities and the worthiness of her position forms a core aspect of her character, even as she contributes significantly to the unit's performances through her creative vision for their aerial displays.