Check for characters missing birthday info here.
January
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Akane Shinjou
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Ichiro Ogami
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Cornelia li Britannia
February
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Lloyd Asplund
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Mokona Modoki
March
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Shinichiro Tamaki
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Umi Ryuuzaki
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Kaname Ohgi
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Kallen Stadtfeld
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Sai Saici
April
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Haruka Amami
May
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Brooklyn Luckfield
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Kira Yamato
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Ibis Douglas
July
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Kusuha Mizuha
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Ruri Hoshino
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Shirley Fenette
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Suzaku Kururugi
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Namiko
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Milly Ashford
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Domon Kasshu
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Sakura Shinguji
August
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Jeremiah Gottwald
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Hikaru Shidou
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Maito Senpuuji
October
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Nunnally Lamperouge
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Anya Alstreim
November
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Amuro Ray
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Orie Takarada
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Sayoko Shinozaki
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Kamille Bidan
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Char Aznable
December
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Shou Utsumi
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Lelouch Lamperouge
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Rikka Takarada
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Fuu Hououji