Fir
フィル, The succeeding "Sword Saint" (『剣聖』をつぐ者), Heir to the Sword Saint, Sword Student
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Fir is a playable character from Fire Emblem: The Binding Blade. She is the daughter of Bartre and Karla making her the niece of Karel.
She can be recruited only by speaking to her with Noah. She makes a brief cameo appearance in Chapter 17 of the Hasha no Tsurugi manga.
Source: Fire Emblem Wikia
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