Check for characters missing birthday info here.
January
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Walker Yumasaki
-
Shizuo Heiwajima
February
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Rokujou Chikage
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Kururi Orihara
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Mairu Orihara
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Kasuka Heiwajima
March
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Mikado Ryuugamine
April
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Shinra Kishitani
May
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Izaya Orihara
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Simon Brezhnev
June
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Seiji Yagiri
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Masaomi Kida
July
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Vorona
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Saburo Togusa
August
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Aoba Kuronuma
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Akane Awakusu
September
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Kyohei Kadota
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Ruri Hijiribe
October
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Anri Sonohara
November
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Erika Karisawa
December
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Mizuki Akabayashi