Birthdays

Characters
The children at Grace Field House are assigned false birthdays to prevent the Mamas and Sisters from knowing which baby is theirs, so the following birthdays may not be their real birthdays. However, the closer two children are in age, the closer their ID Numbers will be to one another. So even if it is not their real birthdays, it is likely very close to their real birthdays.

January

 * 7 - Leslie
 * 8 - Mark
 * 15 - Ray
 * 29 - Vincent

February

 * 2 - Zazie and Michelle
 * 19 - Pepe
 * 28 - Dominic

March

 * 21 - Norman
 * 23 - Cecile
 * 27 - Nigel

April

 * 9 - Olivia
 * 14 - Rossi
 * 25 - Anna
 * 28 - Lannion
 * 30 - Cislo

May

 * 13 - Gilda
 * 15 - Chris
 * 22 - Sandy

June

 * 3 - Sonya
 * 12 - Violet
 * 18 - Barbara

July

 * 4 - Don
 * 7 - Zack
 * 15 - Krone
 * 20 - Jemima
 * 31 - Phil

August

 * 22 - Emma
 * 27 - Carol
 * 30 - Thoma

September

 * 1 - Alicia
 * 3 - Conny
 * 9 - Isabella
 * 17 - Sherry
 * 23 - Peter Ratri
 * 30 - Gillian

October

 * 10 - Jin and Hayato
 * 25 - Oliver

November

 * 28 - Lucas

December

 * 7 - Sarah
 * 9 - Paula
 * 18 - Nat
 * 24 - Yugo
 * 31 - Yvette

People
Real people who worked on The Promised Neverland manga, anime, live action film, or spin-off.

January

 * 13 - Shin'ichirō Kamio (Japanese VA: Sonju)
 * 14 - Yūko Kaida (Japanese VA: Isabella)
 * 17:
 * Posuka Demizu (Manga Artist)
 * Mami Koyama (Japanese VA: Grandma)
 * 22 - Yurito Mori (Live Action: Phil)
 * 23 - Yūichirō Hirakawa (Live Action Film Director)
 * 25 - Noriko Goto (Live Action Film Writer)
 * 26 - Sanae Kobayashi (Japanese VA: Leslie)
 * 28 - Rihito Itagaki (Live Action: Norman)

February

 * 3 - Ryan Bartley (English VA: Gilda)
 * 5 - Leilani Akimoto (Live Action: Anna)
 * 9 - Crispin Freeman (English VA: Peter Ratri)
 * 10 - Yoshimasa Hosoya (Japanese VA: Peter Ratri)
 * 11 - Kimberley Anne Campbell (English VA: Jemima)
 * 13 - Erica Mendez (English VA: Emma)
 * 21 - Shinei Ueki (Japanese VA: Don)
 * 24 - Toshiya Ueda (Japanese VA: Vylk)
 * 28 - Miyu Ando (Live Action: Gilda)

March

 * 8 - Shūhei Miyazaki (The Parodied Jokeland Author/Illustrator)
 * 14 - Yasuyuki Kase (Japanese VA: William Minerva)

April

 * 4 - Janice Kawaye (English VA: Dominic and Chris)
 * 9 - Amber Connor (English VA: Phil)
 * 10 - Rikuto Ishizuka (Live Action: Tom)
 * 22 - Fuga Shibazaki (Live Action: Nat)
 * 23 - Sumire Morohoshi (Japanese VA: Emma)
 * 27 - Morgan Berry (English VA: Leslie)

May

 * 14 - Nao Fujita (Japanese VA: Krone)
 * 15:
 * Yoshino Aoyama (Japanese VA: Mark and Alicia)
 * Koko Hayashi (Japanese VA: Rossi and Eugene)
 * 22 - Mari Hino (Japanese VA: Thoma and Dominic)

June

 * 1 - Lynn (Japanese VA: Gilda)
 * 6 - Soma Santoki (Live Action: Don)
 * 10 - Risa Kaneko (Live Action: Nina)
 * 11 - Toshihiko Seki (Live Action: Demon)
 * 21 - Hiyori Kono (Japanese VA: Phil and Chris)
 * 22 - Xanthe Huynh (English VA: Demon Emma)
 * 23 - Laura Post (English VA: Isabella)
 * 25 - Daman Mills (English VA: Sonju)
 * 26 - Yoshiki Nakajima (Japanese VA: Cislo)
 * 29 - Katusnori Shimizu (Anime Sound Director)

July

 * 11:
 * Cristina Vee (English VA: Thoma, Yvette, and Naila)
 * Allegra Clark (English VA: Rossi and Barbara)
 * 16 - Philece Sampler (English VA: Lannion, Sherry, and Grandma)
 * 17 - Erisa Kuon (Japanese VA: Jemima, Sherry, and Marnya)
 * 19 - Jeannie Tirado (English VA: Norman)
 * 28 - Yuuko Mori (Japanese VA: Lannion and Naila)

August

 * 10 - Ari Ozawa (Japanese VA: Conny)
 * 12 - Laura Stahl (English VA: Ray)
 * 14 - Jackie Lastra (English VA: Conny)
 * 17 - Hiroaki Tajiri (Live Action: Demon)
 * 22 - Keiko Kitagawa (Live Action: Isabella)
 * 29:
 * Minami Hamabe (Live Action: Emma)
 * Erika Harlacher (English VA: Mark)

September

 * 5 - Asada Halo (Live Action: Conny)
 * 6 - Jyo Kairi (Live Action: Ray)
 * 9 - Hiroo Sasaki (Live Action: Demon)
 * 13 - Ai Kayano (Japanese VA: Anna)
 * 14 - Shizuka Ishigami (Japanese VA: Nat)
 * 22 - Michelle Ruff (English VA: Nat)
 * 25 - Mariya Ise (Japanese VA: Ray)
 * 27 - Atsumi Tanezaki (Japanese VA: Mujika)

October

 * 2 - Masahiro Tokuda (Live Action Film Composer)
 * 4 - Natsuki Deguchi (Live Action: Young Isabella)
 * 8 - Yoshiko Mita (Live Action: Grandma)
 * 17:
 * Tori Matsuzaka (Live Action: Peter Ratri)
 * Mark Whitten (English VA: Cislo)
 * 23 - Naomi Watanabe (Live Action: Krone)

November

 * 2 - Lizzie Freeman (English VA: Mujika)
 * 11 - Greg Chun (English VA: William Minerva)

December

 * 3 - Jalen K. Cassell (English VA: Vincent and Zazie)
 * 6 - Ruito Yamashiro (Live Action: Young Ray)
 * 7 - Hidenori Takahashi (Japanese VA: Vincent and Zazie)
 * 9 - Ken Murase (Live Action Film Producer)
 * 22 - Chika Anzai (Japanese VA: Barbara)
 * 24 - Kousei Kimura (Live Action: Lannion)
 * 27 - Maaya Uchida (Japanese VA: Norman)
 * 30 - Nao Shiraki (Japanese VA: Yvette and Chamberlain)
 * 31 - Brianna Knickerbocker (English VA: Anna and Alicia)

Currently unknown birthdays

 * Motota Mizoguchi (Live Action: Thoma)
 * Adinan (Live Action: Dominic)
 * Kit Furuhashi (Live Action: Mark)
 * Misora Shimura (Live Action: Alicia)
 * Girard Sara (Live Action: Yvette)
 * Rupert Palmer (Live Action: Chris)
 * Shizuku Ota (Live Action: Sherry)
 * Haruka Sato (Live Action: Jasper)
 * Sayuki Miyajima (Live Action: Marnya)
 * Ariana (Live Action: Jemima)
 * Nbaiare (Live Action: Chamberlain)
 * Svediozas (Live Action: Damdin)
 * Domerichi Eden Kina (Live Action: Naila)
 * Dahlia N (Live Action: Vivian)
 * Touma H (Live Action: Hans)
 * Poésie Yano (Live Action: Carol)
 * N/A (Japanese VA: Simon)
 * N/A (Japanese VA: Yukko)
 * N/A (Japanese VA: Smee)
 * N/A (Japanese VA: Demon Emma)
 * Jake Eberle (English VA: Vylk and Smee)
 * N/A (English VA: Simon)
 * N/A (English VA: Yukko)
 * N/A (English VA: Marnya)
 * N/A (English VA: Chamberlain)
 * N/A (English VA: Eugene)
 * Cedric Williams (English VA: Don)
 * Rebeka Thomas (English VA: Krone)
 * Nanao (Light Novel Author)
 * Nobuyuki Ito (Live Action Editor)
 * Jun Shiozaki (Live Action Director)
 * Takahiro Obata (Anime Composer)
 * Takushi Sugita (Manga Editor)
 * Mamoru Kanbe (Anime Director)
 * Keisuke Imamura (Live Action Cinematography)
 * Miho Kobayashi (Live Action Producer)

January

 * 8 - The Promised Neverland 2nd Season
 * 11:
 * The Promised Neverland (Anime)
 * The Parodied Jokeland

August

 * 1 - The Promised Neverland (Manga)

December

 * 18 - The Promised Neverland Movie