Yuria

“For the first time in my life I know what I'm here for. And that's to fight... I'm not scared anymore, Seliph. ”
— Julia

Julia (Japanese: ユリア Yuria) is a princess of Grannvale, the daughter of Arvis and Deirdre, twin sister of Prince Julius and a full-blooded descendant of Saint Heim of the Twelve Crusaders. Born some time after the Battle of Belhalla, her father's ascension to the Grannvale throne and the rise of Grannvale as an empire, as a child she was attacked by her brother shortly after he first claimed the Book of Loptous, escaping only with the last of her mother's strength. She was found, taken in and raised by Lewyn, who later entrusted her to the protection of Seliph at the beginning of his revolution in Grann 776. She developed a strong trust in Seliph and was a close ally of his throughout the campaigns in Isaach, the Manster District and Thracia, and proved instrumental in the final confrontation with Julius.

(Source: Fire Emblem Wiki)