Check for characters missing birthday info here.
February
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Xenovia Quarta
March
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Gasper Vladi
April
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Rias Gremory
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Issei Hyoudou
May
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Asia Argento
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Yuuto Kiba
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Yuuto Kiba
June
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Ravel Phoenix
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Vali Lucifer
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Sona Sitri
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Genshirou Saji
July
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Akeno Himejima
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Akeno Himejima
August
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Rossweisse
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Rossweisse
September
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Irina Shidou
October
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Kuroka
November
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Koneko Toujou