Karla​ is a playable character in Fire Emblem: The Blazing Blade. She is the emotionally distant, naive and cool-natured sister of Karel, known as the Princess of Swords. Although she has mastered the art of swordplay, she generally dislikes fighting and often finds peaceful methods of resolving conflict. She fights in arenas in hopes of finding her brother, who killed their parents, although Karla is not aware of this until finding him; and even after she finds out the truth, she strives to redeem him, or die trying. She later marries Bartre and is the mother of Fir from Fire Emblem: The Binding Blade, but dies of illness a few years before that game takes place. It is implied in her supports with Farina that she and Karel were either born or have lived in Sacae.

In order to recruit her, a few conditions have to be met. Exclusively in Hector mode. Bartre has to be promoted to a level 5 Warrior before Chapter 31(x) starts. Karla appears as a neutral unit standing on top of the arena. Having Bartre talk to her will trigger a battle. Both Bartre and Karla must survive the fight in order for her to join your team.

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