Check for characters missing birthday info here.
January
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Jack Atlas
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Katsuya Jonouchi
February
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Adrian Gecko
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Duke Devlin
March
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Mako Tsunami
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Jim Crocodile Cook
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Austin O'Brien
April
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Espa Roba
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Ishizu Ishtar
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Daichi Misawa
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Hiroto Honda
May
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Asuka Tenjouin
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Vagabond
June
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Yuugi Mutou
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Johan Andersen
July
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Mokuba Kaiba
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Yuusei Fudou
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Weevil Underwood
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Yami Yugi
August
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Jun Manjoume
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Keith Howard
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Anzu Mazaki
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Juudai Yuuki
September
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Ryo Bakura
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Shou Marufuji
October
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Pegasus J. Crawford
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Seto Kaiba
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Fubuki Tenjouin
November
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Mai Kujaki
December
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Marik Ishtar
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Dinosaur Ryuuzaki