Check for characters missing birthday info here.
January
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Giotto Vongola I
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Fuuta
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Fuuta (adult)
February
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Dino
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Dr. Shamal
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Lal Mirch
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Lal Mirch (adult)
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Spanner
March
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Fon
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Fon (adult)
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Kyoko Sasagawa
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Superbi Squalo
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Kensuke Mochida
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Byakuran
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Nana Sawada
April
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Tsuyoshi Yamamoto
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Lussuria
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Giannini
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Hana Kurokawa
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Takeshi Yamamoto
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Bluebell
May
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Verde
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Verde (adult)
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Haru Miura
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Kyoya Hibari
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Lambo Bovino
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Lambo Bovino (adult)
June
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Fran
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Mukuro Rokudo
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Iemitsu Sawada
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Enma Kozato
July
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Viper (Mammon)
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Colonnello (adult)
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Romario
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Basil
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Ken Joshima
August
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Ryohei Sasagawa
September
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Kikyo
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Hayato Gokudera
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Gamma
October
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Xanxus
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Reborn
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Reborn (adult)
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Tsunayoshi Sawada
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Chikusa Kakimoto
November
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Bianchi
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Leviathan
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Knuckle
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I-Pin
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I-Pin (adult)
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Asari Ugetsu
December
-
Shouichi Irie
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Chrome Dokuro
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Belphegor
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Lampo