Montmorency Margarita la Fère de Montmorency is a student at the Tristain Academy of Magic and a classmate of Louise Françoise Le Blanc de La Vallière. She is the eldest daughter of the distinguished Montmorency family, a noble house whose name carries considerable social weight in the kingdom of Tristain. Montmorency is sixteen years old, with long blonde hair and blue eyes, and her familiar is a frog named Robin. She specializes in water magic and is known by the runic name Perfume, a title that reflects her refined and somewhat aromatic presence. Like many nobles of Tristain, she possesses a strong sense of pride in her lineage and upbringing, but she also demonstrates a mature and kind disposition toward her classmates. She holds a firm intolerance for dishonesty, as shown when she reacts strongly to acts of cheating, particularly in romantic matters.

Montmorency’s primary motivation is to uphold her family’s honor and to pursue her personal interests, most notably alchemy. She has a deep fascination with potion-making and magical experimentation, often using the academy’s resources to create various concoctions. This passion stems from a desire to be skilled in a craft that sets her apart from other nobles, and she takes great pride in her alchemical knowledge. Her role in the wider story is that of a supporting character who aids the main cast with her expertise in alchemy and water magic, especially when they encounter problems that require practical, non-combat solutions.

Her key relationships are central to her character. She is in a romantic relationship with Guiche de Gramont, a fellow noble and classmate. Their relationship is marked by moments of jealousy and drama, particularly when Guiche’s flirtatious nature tests Montmorency’s patience and trust. Despite these conflicts, she remains genuinely attached to him and often works to reconcile their differences. She is also a close friend of Louise and the other female students, though she is one of the few female characters who does not compete for the affection of the main protagonist, Saito Hiraga. This allows her to maintain a more detached and observational role within the group’s romantic dynamics.

Over the course of the series, Montmorency shows development in her emotional maturity. She becomes more willing to set aside her pride when necessary and learns to navigate the complexities of her relationship with Guiche. Her motivations also expand beyond personal pride as she grows more invested in the well-being of her friends, offering her alchemical skills to assist in their missions. Notable abilities include her mastery of water magic, which allows her to summon a water spirit that has historically aided her family. Her alchemical skills enable her to create potions with various effects, from healing to love charms, and she frequently uses these to solve problems or advance her own goals. Through her blend of noble pride, emotional vulnerability, and practical expertise, Montmorency stands out as a memorable supporting figure in the world of The Familiar of Zero.