Maggy serves as the primary medical officer and surgeon at the paramilitary base known as Arzenal, a role she fills with a distinctive blend of professional skill and peculiar personal traits. She is a trusted confidante to Jill, the commander of Arzenal, and their long-standing friendship places her among the few individuals aware of Jill’s secret conspiracy known as the Libertus, a plan for the Normas to rebel against the world that oppresses them.

In terms of personality, Maggy is best known for her unsettling enthusiasm for the sight of blood, an aspect of her character that contributes to her reputation as being somewhat cold-hearted, bad-mouthed, and cruel in her demeanor. Despite these abrasive qualities, her abilities as a surgeon and cybernetics repair expert are beyond reproach; she is credited with saving the lives of a great many Norma soldiers, proving that her macabre interests are backed by a genuine and necessary competence. Her look is characterized by dark red hair and purple eyes, and she is often seen wearing a hat, which notably saves her life when a bullet passes through it instead of her head.

Maggy’s role in the story is primarily centered on her medical duties, but she also acts as a steady, supportive force for Jill’s ambitions. Throughout the series, she is present for several key moments that demonstrate her dedication to her duties and her loyalty to her commander. When a young dragon named Vivian is captured and reverts to her human form, Maggy is the one who injects her with a product to stabilize her and brings her to the infirmary. Her commitment to her oath as a healer is most evident during the final invasion of Arzenal. While other personnel panic, Maggy calmly orders her staff to prioritize the transport of the severely injured. In a moment of quick thinking, she intervenes to save Emma Bronson, a non-Norma who was terrified and ran toward enemy fire, pulling her out of the line of fire just in time. Following the fall of the base, she is seen retreating aboard the ship Aurora alongside other survivors like Momoka and Mei.

Maggy's key relationships are most prominently defined by her friendship with Jill, as she is one of the few characters who is let in on the plans for Libertus from early on. She also has a brief but telling interaction with Emma Bronson, whom she tries to comfort during the chaos of the attack, showing a protective side that exists beneath her harsh exterior. When Emma rejects her initial attempt at comfort, Maggy still acts to save her life later, highlighting that her actions speak louder than her harsh words. Her relationship with the other Normas is primarily professional, though she demonstrates a clear sense of responsibility toward them, as shown by her frustrated attempt to recover Vivian when the girl is taken by enemy soldiers.

While Maggy does not pilot a Para-mail or participate in direct combat, her development lies in her unwavering resolve in the face of extreme danger. She undergoes little emotional change, instead serving as a constant pillar of grim pragmatism. From tending to wounds in the medical bay to orchestrating a retreat under fire, her growth is shown through her steadfast execution of her duty, proving that her loyalty to Jill and her commitment to the survival of her charges are her primary motivations. Her notable abilities extend beyond standard surgery to include expertise in the cybernetic repairs required to maintain the injured Norma soldiers, making her an indispensable asset to the community of Arzenal.