Louise is a playable character in Fire Emblem: The Blazing Blade. She is the beautiful wife of Pent, Count of Reglay of Etruria. She is also the distant cousin and close friend of Queen Hellene of Bern. She is somewhat childlike in nature, but can be overprotective as well, as her supports with her adoptive son Erk prove.
Louise was actually not born a high noblewoman, rather a girl from low nobility. In order to get Pent to choose her as his wife, she gained his admiration by vowing to protect him with her bow, with which she possessed deadly skill, rather than singing and dancing like the other girls who had been summoned to meet with Pent so he could choose a bride from them. Ironically, she grew up into such a gorgeous and elegant woman that Rebecca, in their supports, begs her to help her become a true lady. Louise then explains how she and Pent met and married, telling her that her "secret" was being strong-willed and focused. However, in a support conversation with Erk, she is described as sweet and childlike.
Louise is the mother of Klein and Clarine of Fire Emblem: The Binding Blade, as well as a relative of Queen Hellene of Bern. As the fight with the Black Fang unfolds, she finds out that she is already pregnant with Klein. If Louise falls in battle, she and her husband, Pent, will both leave the party.