Doctor is a tall and strikingly attractive woman with a distinct and stylized appearance. She has wavy, chest-length hair that is predominantly pink and fades into light blue at the tips. Her hair is styled into a low side ponytail that typically rests on her left shoulder, with side-swept bangs framing the left side of her face and a shoulder-length lock hanging on the right. She has golden-yellow eyes, sharp facial features, and a notably alluring figure. Her eyebrows are visibly darker than her dyed hair, suggesting that she bleaches her hair for cosmetic effect.

Her outfit is deliberately provocative. She wears a dark purple, strapless bodysuit, over which she layers a translucent pink crop top with corset-style lacing at the front and a matching mini-skirt. Over this ensemble, she dons a white medical coat, accessorized with a stethoscope worn like a necklace, a black belt with a gold circular buckle, and her mandatory bomb collar. Her footwear consists of thigh-high, high-heeled boots, adding to her commanding and sensual appearance. The entire outfit blends elements of medical attire with stylized, attention-grabbing fashion, reinforcing her character as both a seductress and a deadly manipulator.

Doctor is a deeply amoral and sadistic individual, driven by an obsession with power and a distorted view of medical authority. Described as a “mad scientist”, she takes pleasure in toying with people’s lives, viewing others not as individuals but as playthings for her surgical experiments and manipulations. Her calm and composed exterior often masks her ruthless intentions, and she frequently teases her comrades, particularly Courier, with a mix of charm and calculated provocation. She is habitually seen playing with her nails, and her favorite indulgences include wine and cheese, which further reflect her cultivated yet cold personality.

At her core, Doctor is motivated by a desire for absolute control over life and death, which she openly admits was the reason she pursued the medical profession. Her belief that her role as a doctor entitles her to determine who lives and who dies has evolved into a twisted god complex. She sees herself as someone who should be able to bend mortality to her will wanting the power to make someone die or survive simply by deciding it.

This worldview manifests in repeated acts of betrayal and cruelty. She shows no loyalty to her allies or employers, readily turning against the Akudama, the children, and even the Executioners when it suits her goals. Her lack of empathy is further underscored by acts of mass murder committed on a whim, such as when she kills all the passengers aboard a train or airship simply because she found them irritating. Her callousness extends to individuals as well, exemplified when she deliberately sabotages Brawler’s medical treatment, covertly accelerating his death simply because she found him bothersome.

Doctor’s twisted interpretation of what it means to be a doctor is at the heart of her actions. She believes that her knowledge grants her the right to experiment, manipulate, and kill without remorse. This philosophy not only defines her villainous nature but also underlines her ultimate ambition: to attain the absolute power to command life and death with a single thought. Her pursuit of this ideal drives her continuous experimentation and her utter disregard for human life, including her own.

Doctor is infamous for her unorthodox and ethically void methods of crime, blending her medical expertise with violent, often lethal behavior. She is known to save lives selectively, but only when it aligns with her personal interest, often killing anyone who obstructs her path using surgical instruments such as scalpels and various other medical tools. Her approach to crime reflects both her surgical precision and her disregard for human morality.

In addition to her surgical skills, Doctor is highly knowledgeable in chemistry, demonstrating proficiency with tranquilizers and other chemical agents, which she uses to subdue or manipulate others. Her medical knowledge, combined with her lack of conscience, makes her particularly dangerous in both physical and psychological confrontations.

Doctor also exhibits a tendency to exploit her appearance and sexuality to manipulate those around her. In one instance, she propositionally teases Courier while requesting a cigarette, implying that he could “have a go” as she presses against him. This behavior, while not overtly pursued beyond implication, illustrates her willingness to use seduction as another tool in her repertoire of manipulation.

True to her title, Doctor possesses exceptional medical knowledge and surgical expertise that far exceeds normal human capability. She is an elite surgeon, chemist, and pharmacologist, capable of performing highly advanced procedures with precision and speed. Her vast knowledge spans both natural and synthetic medicines, and she is shown to be proficient in techniques and treatments from various global medical practices. Despite her sadistic tendencies, her talent in the medical field is portrayed as nearly superhuman.

Her surgical skills are particularly extraordinary. Doctor is able to treat virtually any injury, provided the patient is still alive even if that patient is herself. She demonstrates this ability multiple times throughout the series: stitching up a deep throat wound, reattaching her own body after being severed at the waist, and restoring Cutthroat’s severed legs in a short period of time. Her primary weapon of choice, fittingly, is a scalpel, which she wields with deadly precision in both surgical and combat situations.

In addition to surgery, Doctor is also a skilled chemist and pharmacist, regularly employing drugs and tranquilizers of her own creation to manipulate or subdue others. Her expertise appears to extend into genetic research as well; she is shown studying the Brother’s blood to uncover the secret behind his immortality, suggesting a working knowledge of genetic engineering and manipulation.

Doctor also possesses superhuman endurance. She can operate on herself immediately after sustaining devastating injuries, showing no visible signs of pain or distress. She endures extensive blood loss and critical trauma without hesitation, maintaining enough control to perform complex procedures on her own body with remarkable speed and calm.