Check for characters missing birthday info here.
January
February
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Koukin Shuyu
March
-
Hakufu Sonsaku
May
-
Shikou Soujin
June
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Moutoku Sousou
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Chutatsu Shibai
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Chuukou Kyocho
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Genjou Kakouton
July
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Ukitsu
August
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Shiryu Chou'un
September
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Shimei Ryomou
October
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Ryofu Housen
November
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Unchou Kan'u
December
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Kouha Kannei
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Koudai Chinkyu