Louise Françoise Le Blanc de La Vallière is the main female character of The Familiar of Zero.
Louise is the third and youngest daughter of the Duke of La Vallière and Karin, Duchess of La Vallière. Her father is the head of the House of La Vallière, whose home, the Duchy of La Vallière, is in northeastern Tristain.
Louise is a second-year student at the Tristanian Academy of Magic. She is a talentless mage who is often ridiculed by her classmates, especially Kirche von Anhalt-Zerbst. Because every spell she casts fails, she is nicknamed Louise the Zero.
She summoned Hiraga Saito from as her familiar. Believing him to be a commoner, she asked Professor Colbert to summon another familiar, but he denied her request. Continuing the ritual, she kissed Saito to form a contract. She did not initially believe that he came from . However, she believed him once she saw him use the Staff of Destruction.
The new instructor Professor Chevreuse asked Louise to perform transmutation. Louise proceeded against her classmates' protests, resulting in an explosion.
Louise later found out that she was a void mage.
Louise traveled to Albion during Henrietta's campaign against Albion. She was ordered to fight the enemy until the end while the Tristanian forces retreated. Her familiar Hiraga Saito fought the enemy in her place. Later she became Her Majesty's court lady.
Louise becameto Henrietta. Later, she became the heiress to the throne of Tristain.
|Ancestors of Louise de La Vallière|
Louise is based on , a mistress of from 1661 to 1667, who later became the and Duchess of Vaujours.