Constanze Amalie von Braunschbank Albrechtsberger is a student at Luna Nova Academy and hails from Germany. Her full name is notably long and reflects a noble lineage, as she is a descendant of an aristocratic family. Physically, she is one of the shorter students in her year, standing at 152 cm, and is recognized by her teal-green eyes, slightly tanned skin, and typically serious or grumpy expression. She wears the standard Luna Nova uniform, but her sash and hatband are customized with green accents, and she often forgoes the hooded dress in favor of a vest and skirt of the same color.

Constanze is defined by her near-total silence, as she very rarely speaks and has no lines of dialogue for the majority of the series. To communicate, she primarily relies on her actions, writing on a small chalkboard, and the use of small, versatile robots called Stanbots, which she controls with magic and which act as her voice and expressive proxy. She is a serious and dedicated individual who is deeply passionate about her work. Constanze prefers to work alone and can become irritated or even dangerous when others interfere with her projects without invitation. Despite this solitary and intense demeanor, she is not malevolent and possesses a friendly side that she shows through her actions rather than words.

Constanze is a mechanical genius and a self-described mecha otaku. Her primary motivation is the creation and modification of technology, which she seamlessly blends with magic to produce a wide array of magitek devices. This pursuit often puts her at odds with Luna Nova's regulations, as she is known for smuggling in high-tech electronics, modifying them with magic, and even selling them to other students for pocket money. Within the story, she is a member of the trio of troublemakers that includes her roommates, Amanda O Neill and Jasminka Antonenko. Her skills are crucial during several events, most notably when she participates in the ghost-hunting contest known as the Wild Hunt.

Her key relationships include her close friendship with her roommates, especially Amanda, who often benefits from Constanze s inventions. She also shares a friendly connection with Sucy Manbavaran, with whom she conducts secret research. The most significant development in her relationships occurs with Atsuko Kagari. Initially reluctant to accept Akko s help after one of her Stanbots is accidentally broken, Constanze slowly warms to her persistent classmate. During the Wild Hunt, Akko proves herself useful by helping gather materials and offering a key suggestion, which Constanze incorporates into her battleship, allowing it to transform into a giant robot she names Grand Chariot. Through this shared endeavor, Constanze comes to see value in Akko s enthusiasm and perspective, leading her to genuinely smile for the first time in the series. This emotional development culminates in the final episode, when she speaks her first and only line of dialogue, the simple word fly, as she helps power Akko s rocket broom.

Constanze s notable abilities are extensive, rooted in her mastery of both magic and engineering. She is an expert in alchemy, able to transmute materials, such as turning a lead block into a fully formed robot. Her most famous creations are her Stanbots, which can transform into different configurations, including a magical laser gun or shotgun. She has also designed a mechanized flying broom that operates with propellers rather than traditional magical flight, allowing her to compete in broom races. Her greatest creation is the Stanship, a large, flying magical warship armed with cannons that can transform into a humanoid mecha capable of powerful physical attacks. Beyond her inventions, she is also a capable witch, proficient in basic magic, flight magic, and object control, which she primarily uses to power and operate her technological devices.