The following includes birthdays of RPers and characters. Most canon birthdays of Zero and DM characters are from character profiles in Yu-Gi-Oh! Character Guidebook: The Gospel of Truth. A few canon birthdays of Zero and DM characters are from http://yu-gi-oh.jp/. Canon birthdays of GX characters are from character profiles in the Yu-Gi-Oh! GX manga volume 9. Birthdays with an asterisk (*) are headcanons, so they were made up by RPers because they are unknown in the canon. If you are unsure who a character is, there are links to the Wikia pages of the characters at Zero and DM List of Remaining Characters and GX List of Remaining Characters.
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​JANUARY
January 1: Birthday of David Rabb (GX manga character)
January 25: Birthday of Jounouchi Katsuya (Zero and DM manga and anime character)
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FEBRUARY
February 5: Birthday of Amon Garam (GX manga and anime character)
February 17: Birthday of Cyndia* (DM manga and anime character)
February 18: Birthday of Rebecca Hopkins* (DM anime character)
February 28: Birthday of Otogi Ryuuji (DM manga and anime character)
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​MARCH
March 1: Birthday of Kajiki Ryouta (DM manga and anime character)
March 19: Birthday of Theodora (RPer) and James "Jim" Crocodile Cook (GX manga and anime character)
March 21: Birthday of Nadège (founder and RPer)
​March 29: Birthday of Takaido* (DM manga and anime character) and Austin O'Brien (GX manga and anime character)
​APRIL
April 1: Birthday of Esper Roba (DM manga and anime character) and Mr. Ryuga (GX manga character)
April 5: Birthday of Ishizu Ishtar (DM manga and anime character)
April 9: Birthday of Melody (RPer)
April 12: Birthday of Isono* (DM manga and anime character) and Misawa Daichi (GX manga and anime character)
April 19: Birthday of Crystal (RPer), Honda Hiroto (Zero and DM manga and anime character), and Teana* (DM Forbidden Memories character)
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​MAY
May 5: Birthday of Tenjouin Asuka (GX manga and anime character)
May 10: Birthday of Clara Grace (RPer)
May 19: Birthday of Rafael Mirdcleux* (DM anime character)
​May 23: Birthday of Valon* (DM anime character)
​JUNE
June 4: Birthday of Mutou Yuugi (Zero and DM manga and anime character)
June 6: Birthday of Ghost Kotsuzuka (DM manga and anime character)
June 11: Birthday of Johan Andersen (GX manga and anime character)
June 13: Birthday of Fujiwara Yuusuke* (GX anime character)
June 26: Birthday of Dartz* (DM anime character)
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​JULY
July 7: Birthday of Kaiba Mokuba (Zero and DM manga and anime character)
July 10: Birthday of Hibiki Midori (GX manga character)
July 13: Birthday of Saiou Takuma* (GX anime character)
July 21: Birthday of Insector Haga (DM manga and anime character)
​July 26: Birthday of Yami Yuugi/Atem (Zero and DM manga and anime character)
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​AUGUST
August 1: Birthday of Manjoume Jun (GX manga and anime character)
August 12: Birthday of Keith Howard (DM manga and anime character)
August 13: Birthday of Mana* (DM manga and anime character)
August 18: Birthday of Jeanna (RPer), Mazaki Anzu (Zero and DM manga and anime character), and Priestess Isis* (DM manga and anime character)
August 31: Birthday of Yuuki Juudai (GX manga and anime character)
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​SEPTEMBER
September 2: Birthday of Bakura Ryou (Zero and DM manga and anime character) and Bakura Amane* (Zero manga character)
September 5: Birthday of Kaiba Gozaburo* (Zero and DM manga and anime character)
September 25: Birthday of Marufuji Shou (GX manga and anime character)
September 27: Birthday of Lou​ (RPer)
​OCTOBER
October 4: Birthday of Mutou Sugoroku (Zero and DM manga and anime character)
October 7: Birthday of Kaiba Noa* (DM anime character)
October 8: Birthday of Pegasus J. Crawford (DM manga and anime character)
October 10: Birthday of Reggie MacKenzie (GX manga character)
October 25: Birthday of Kaiba Seto (Zero and DM manga and anime character), Priest Seth* (DM manga and anime character), and Thief King Bakura (DM manga and anime character)
October 27: Birthday of Critias (DM anime character)
October 31: Birthday of Tenjouin Fubuki (GX manga and anime character)
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​NOVEMBER
November 1: Birthday of Marufuji Ryou (GX manga and anime character)
November 4: Birthday of Hibiki Koyo (GX manga character)
November 18: Birthday of Rishid Ishtar (DM manga and anime character)
November 20: Birthday of Kujaku Mai (DM manga and anime character)
November 25: Birthday of Satake* (DM manga and anime character)
November 28: Birthday of Kawai Shizuka* (Zero and DM manga and anime character)
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​DECEMBER
December 12: Birthday of Tenma Gekkou and Tenma Yakou** (DM manga characters)
December 13: Birthday of Jade (RPer)
December 19: Birthday of Edo Phoenix (GX manga and anime character)
December 23: Birthday of Malik Ishtar and Yami Malik (DM manga and anime characters)
December 25: Birthday of Richie Merced, Depre Scott, and all Pegasus's orphans excluding the Tenma twins** (DM manga characters)
December 27: Birthday of Priest Karim* (DM manga and anime character)
December 29: Birthday of Dinosaur Ryuuzaki (Zero and DM manga and anime character)
December 31: Birthday of Katlin (RPer)
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* These characters do not have official birthdays, so the RPers made up birthdays for them.
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** Pegasus's orphans do not know their birthdays, so they all chose a single birthday on December 25. This is canon because Itou Akira, the author of Yu-Gi-Oh! R, posted it at https://twitter.com/BrotherlyF/status/1008401274868551680. My questions are on the top, and Itou's replies are on the bottom. In the group, Yakou and Gekkou found out they were born on December 12 as a headcanon based on Suzugamori Ren's canon birthday. This is because Ren from Cardfight!! Vanguard is based off of Yakou in Yu-Gi-Oh! R, which were both written and drawn by Itou.