Check for characters missing birthday info here.
January
February
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Irisviel von Einzbern
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Rin Tohsaka
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Shiki Ryougi
March
April
May
June
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Sion Eltnam Atlasia
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Tokiomi Tohsaka
July
August
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Satsuki Yumizuka
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Ivan the Terrible
September
October
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Waver Velvet
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Dan Blackmore
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Shiki Tohno
November
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Vlad III Tepes
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Vlad III
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Kiritsugu Emiya
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Lil' Ronnie
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Lakshmibai
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Illyasviel von Einzbern
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Billy the Kid
December