Check for characters missing birthday info here.
January
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Senbei Norimaki
March
-
Yamcha (teen)
April
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Goku Jr.
May
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Arale Norimaki
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Majin Buu
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Kid Buu
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Super Buu
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Piccolo
-
Android 16
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Super Saiyan Gohan
-
Gohan Son
June
-
Launch (good)
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Launch (bad)
August
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Bulma Briefs (adult)
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Bulma Briefs (teen)
September
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Puar
-
Oolong
October
-
Krillin
November
December
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Syn Shenron