There are several white-haired female swordsmen in anime and manga. Here are a few notable characters that fit that description:
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Kushina Uzumaki - While not a swordsman in the traditional sense, she is a strong character from "Naruto" who has a notable fighting style.
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Miyuki Shirogane - In "Kaguya-sama: Love is War," she doesn't wield a sword, but her character is often associated with a sharp intellect that could be metaphorically likened to a swordsman.
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Inoue Orihime - From "Bleach," while not a traditional swordsman, she does have a unique fighting style that involves spiritual powers.
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Altair - From "Re:Creators," she wields a sword and has a striking white-haired appearance.
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Shirou Emiya (female version) - In "Fate/Stay Night," there are alternate versions where a female version of Shirou, who can wield swords, appears in certain adaptations or fan interpretations.
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Erza Scarlet - From "Fairy Tail," she is known for her quick sword skills and has various armors, some of which depict her with white hair.
If you have a specific anime or scenario in mind, feel free to ask, and I can give more tailored recommendations!