Lianna

Lianna (リアン, ) is the princess of Aytolis. Along with her twin brother, Lianna seeks to restore the mysterious Shield of Flames.

Lianna is classically trained in the sword techniques of Aytolis and Gristonne, making her adept at catching enemies and fighting with steady attacks.

Lianna's personal weapons are the twin swords made of the fangs of the fallen Divine Dragon of Aytolis, but is more tied to the fang named Facinna.

Trivia

 * Rowan and Lianna were originally intended to use axes and spears, respectively, but were changed to sword users for the sake of the tutorial. The dev team didn't want the experience to change based on which character was picked, and they also wanted to establish how the weapon triangle worked starting with the sword.
 * Rowan and Lianna had similar designs to Fire Emblem Heroes protagonist Alfonse and Sharena in their alpha designs. This is merely sheer coincidence, due to Koei-Tecmo being kept in the dark about future Fire Emblem games that were made during the development of Warriors until they were made aware of it, thus leading to the twins' current designs.
 * Lianna was supposed to have Bond conversations with Niles, but, for whatever reasons, the plans fell through when Niles was made available with the Fates DLC pack.