Bertille Althusser is a character from the visual novel and anime Walkure Romanze. She is a second-year student at the prestigious Winford Academy, where she is enrolled in the knight course. Coming from the distinguished Althusser baron family, which is known for its generous donations to the academy, Bertille carries herself with the pride and confidence expected of a noble. She is known for her striking appearance, which includes long blonde hair styled into distinctive curled drills, and ultramarine blue eyes.

In terms of personality, Bertille projects a high-handed and somewhat overbearing demeanor, often accompanied by a characteristic laugh. She is proud of her lineage and her status as a knight, and she has a fondness for flashy things and being the center of attention. Despite her ostentatious and sometimes arrogant attitude, she is not a malicious person. Bertille possesses a strong sense of right and wrong and is capable of honestly acknowledging the good qualities in others, which makes her a difficult character to genuinely dislike. Beneath her proud exterior lies a surprisingly kind and affectionate nature. She is loyal to those she respects and, once she accepts someone as a friend or rival, she treats them with unwavering sincerity. Her pride is deeply tied to her identity as a knight of the White Rose, and she often views problems as matters to be settled through honorable duels.

Bertille’s role in the story is primarily that of a rival and a sub-heroine. Her most significant early action is challenging the protagonist, Mio Kisaki, to a jousting duel. This challenge stems from an embarrassing incident where Mio is accidentally responsible for tearing Bertille’s skirt. Although Bertille loses this duel, she gains a new respect for Mio and comes to recognize her as a worthy rival, even encouraging Mio to pursue the path of a knight. In the spin-off fan disc, Walkure Romanze: More&More, Bertille is promoted to a main heroine. Her personal route focuses on her relationship with the male begleiter, Takahiro Mizuno, as she strives to win the jousting tournament.

Bertille’s key relationships are central to her character development. She is constantly accompanied by her two close friends and classmates, Emma and her begleiter Ann, with whom she shares a harmonious and supportive dynamic. Her rivalry with Mio evolves from a simple challenge into a bond of mutual respect and encouragement. A significant relationship is with her childhood friend, Alice Weinberg, who is introduced in More&More. Alice is both a dear friend and a fierce rival, and their competitive history adds depth to Bertille’s story, often drawing in Takahiro as a point of contention. Her relationship with Takahiro is central to her development; he becomes her begleiter and helps her refine her skills, leading to a romantic connection.

Throughout the story, Bertille shows notable development, particularly in her skills as a knight. She possesses above-average motor skills, stamina, and a powerful desire to learn, allowing her to absorb advice and improve rapidly. Her jousting ability is officially ranked at B level, indicating a competent and formidable competitor who is not yet at the very top. With proper guidance, she has the potential to become one of the best. Her armor is a testament to her love for flashy and fashionable things; it is a unique, avant-garde piece from Milan designed for elegance and ease of movement, which notably sacrifices lower body protection for a more striking appearance. Beyond jousting, her notable abilities include cooking, playing the violin, and styling her own elaborate hair.