Alexandra Magritte, often called Alec by her friends, is a transfer student from the Grand Duchy of Luxembourg who comes to Japan alongside her childhood friend, Teresa Wagner. She is a teenage girl with a striking appearance, characterized by her long, chest-length red hair and sharp orange eyes. Her elegant and composed style makes her stand out as a notable beauty within the circle of friends she joins at Koinohoshi High School.

At her core, Alexandra is a calm, reserved, and highly serious individual. She is not one to laugh often and typically maintains a cool, collected demeanor. However, this composed exterior conceals a fiercely protective nature, especially regarding Teresa. As a childhood friend and a sworn guardian, she is willing to go to any lengths to ensure Teresa’s safety and well-being. This protective instinct can manifest as a dark and intimidating side, particularly when she perceives a threat to her charge. For example, she reacts with immediate hostility and physical force towards the overly friendly Kaoru Ijuin, whom she initially mistakes for a nuisance chasing after Teresa. Despite her often serious and no-nonsense attitude, Alexandra possesses a hidden romantic side, as she is known to enjoy love stories in books and films.

Alexandra’s primary motivation throughout the story is to act as Teresa’s protector and confidante. She has been by Teresa’s side since they were children, a dedication highlighted by a past incident where she jumped into a river to retrieve Teresa’s wreath. This sense of duty is so profound that she even addresses Teresa with formal respect in public, while using a more familiar tone when they are alone. In her role as an exchange student, she joins the school’s photography club, where her intelligence and keen observational skills make her a valuable member. She often serves as a sharp commentator on the events around her, able to read between the lines and accurately discern the hidden feelings and secrets of others. Her physical abilities are as impressive as her mental prowess; she is athletic and knows martial arts, with Teresa once comparing her swift, flamboyant movements to those of a ninja.

Key relationships define much of Alexandra’s arc. Her bond with Teresa is the most significant, functioning as a mix of best friend, sister, and loyal bodyguard. Her relationship with Kaoru Ijuin evolves notably over the course of the series. She initially despises him, believing he is frivolously chasing after Teresa, and often threatens him with a sadistic edge. However, as she becomes closer to the group and learns the true, heartfelt purpose behind his public persona, the Kaoru Ijuin Show, she gains respect for him. Another crucial, yet hidden, relationship is with Charles de Loire. Alexandra secretly harbors romantic feelings for Charles, but she consciously chooses to suppress them because she knows he is engaged to Teresa. Her development is subtle but present; she begins to open up slightly, allowing her guard to lower as she integrates into the group, and ultimately reveals her long-held secret feelings at a critical moment. In the end, she is seen beginning a new, more honest chapter with Charles, free from the shadow of his previous engagement.

Notable abilities include her physical strength and combat skills, which she uses decisively to defend Teresa. She is also exceptionally intelligent and well-read, providing useful information and acting as an impromptu commentator on various situations. Her observational skills are so acute that she can see through the true intentions of those around her. A unique tell is her habit of touching her left arm whenever she is lying or trying to hide her true feelings. She also has a notable distaste for natto, a fermented soybean dish, which she finds so repulsive that she wears a gas mask when she has to prepare it. She is often seen with a Nikon COOLPIX A900 camera, reflecting her active participation in the photography club.