Jeanne is a female vampire who appears in Jun Mochizuki's manga. She is known by the title of the Crimson Gauntlet and has also been called the Hellfire Witch. Having lived for well over a century, she possesses a youthful appearance that seems to be around eighteen or nineteen years of age. Her most distinguishing physical features are her pale, almost pinkish-blonde hair and her amber eyes, which turn a deep red when her vampiric bloodlust takes hold.

Jeanne’s past is marked by tragedy and servitude. She was born during an era of latent war between humans and vampires. Her life changed forever when her adoptive parents were discovered to be supporting humans, an act considered treason against their own kind. After their execution, the Vampire Senate condemned the young Jeanne to become a Bourreau, a position often translated as executioner, forcing her to kill other vampires as a tool for the council. For centuries, she was used as a living weapon in this role. Eventually, her mentor, Lord Ruthven, induced a century-long coma, and when she awoke to a world no longer at war, she was assigned as a personal knight and bodyguard to Luca Oriflamme, the young nephew of her former teacher.

Jeanne’s personality is a study in contrasts shaped by her difficult history. On the surface, especially when acting in her professional capacity, she is rigid, stoic, and fiercely violent, possessing no filter in her speech as a soldier or executioner. She is intensely loyal to her master Luca, viewing his word as law and willing to do anything to ensure his protection. Beneath this harsh exterior, however, Jeanne is surprisingly sweet, shy, and has an almost childlike innocence. This softer side is a product of her isolated upbringing and her social inexperience, as she spent much of her long life as an isolated tool rather than as a person allowed to live freely. She is easily flustered by kindness or romantic attention, has a known fondness for sweets, and is notably bad at lying despite her own belief to the contrary.

Her central motivation in the story is largely tied to her sense of duty and her desperate, quiet wish to be something more than a tool. She is driven by a deep-seated loyalty to protect Luca Oriflamme, viewing his safety as her primary purpose. Furthermore, she is burdened by her secret status as a curse-bearer, struggling with an uncontrollable and violent thirst for blood that is considered shameful and dangerous among vampires. This impulse is so severe that she requires medication to suppress it, and she lives in constant fear of losing control and harming those she cares for. This fear and her shame about her own nature are powerful forces behind many of her actions.

Jeanne’s most significant relationship in the narrative is with the human doctor Vanitas. Initiated when he blackmails her into a contract where she can only drink his blood, their relationship begins as one of mutual annoyance and distrust, with Vanitas gleefully flustering the easily embarrassed Jeanne. However, as the story progresses, it deepens into a complex romantic bond. Despite her claims of disliking him, Jeanne finds herself caring for Vanitas, especially after witnessing his genuine efforts to save people she had given up on. Vanitas, in turn, shows a vulnerable side only to her, and their connection grows through moments of forced intimacy and life-saving actions. Before this, her key relationship was with the elderly vampire Lord Ruthven, who acted as her tutor and remains a figure of authority. Her protective loyalty is directed almost entirely at her young master, Luca, whom she serves as a chevalier. Her past also connects her to the character Chloé, a friend from her childhood who later becomes a central figure in the Gévaudan arc.

Jeanne’s development throughout the series is centered on her gradual transformation from a self-loathing tool into an individual who can accept her own desires and emotions. Forced to view herself as nothing more than a Bourreau, a simple object for killing, she begins to change through her interactions with Vanitas and her dedication to Luca. Her plan to make Vanitas hate her by pretending to have feelings for him backfires spectacularly, leading her to confront real romantic attraction for the first time. As she becomes more involved with the main cast, she starts to act on her own wishes rather than simply following orders, even as she continues to battle her dangerous bloodlust and the psychological scars of her past.

As a vampire, Jeanne possesses all the typical superhuman abilities of her kind, including immense strength, speed, reflexes, and accelerated regeneration, all of which are achieved by manipulating the World Formula. Her primary weapon, for which she is famous, is a massive metal gauntlet named Carpe Diem, which she carries in a coffin-like case. This gauntlet is a unique piece of equipment designed specifically for her role as an executioner; it can fire powerful projectiles reminiscent of flames or energy rays from its palm, causing enormous destruction. Jeanne is also a highly seasoned and capable warrior, possessing centuries of combat experience in hand-to-hand fighting and swordsmanship, making her a formidable opponent even without her signature weapon.