Louise Balze is a supporting character in the anime The Fruit of Evolution: Before I Knew It, My Life Had It Made. She is known as the Knight of Swords and serves as the captain of the Valkyries, Wimburg's most prestigious military unit. From a young age, she displayed exceptional talent in sword fighting, becoming a prodigy among her peers. Despite having a low aptitude for magic, her martial skill allowed her to rise to the position of captain at an early age. She is the sister of Florio Balze, who leads Wimburg's magical division. Louise wields a magical weapon called the Water God's Rapier, through which she can channel water magic to perform powerful slashing attacks in combat.

Louise is a dedicated and skilled warrior, driven by a strong sense of duty to protect her kingdom. Her motivation stems from her commitment to the Valkyries and the safety of Wimburg. She is serious and disciplined, but also capable of seeking help when necessary. In the second season, she plays a key role in the conflict against the Great Devil Order. She arrives wounded at the protagonist Seiichi Hiiragi's location and informs him of the fate that befell Zakia at the hands of the Order, setting important story events in motion. Her relationship with Seiichi is one of trust and reliance, as she turns to him for aid in a dire situation. Throughout the story, Louise demonstrates her combat prowess and leadership, though her character does not undergo extensive personal development in the anime. Her notable abilities include masterful swordsmanship, the use of her enchanted rapier for water-based attacks, and her tactical leadership of the Valkyries. She appears in both seasons of the anime, playing a more active role in the second season's conflict.