David Faustino (38)

Mako (voice)

P.J. Byrne (37)

Bolin (voice)

Seychelle Gabriel (21)

Asami Sato (voice)

Mindy Sterling (58)

Lin Beifong (voice)

Adrian LaTourelle (44)

Unalaq (voice)

Henry Rollins (51)

Zaheer (voice)

J.K. Simmons (57)

Tenzin (voice) / Mushi (voice)

Janet Varney (36)

Korra (voice) / May (voice)

Steve Blum (51)

Amon (voice) / Amon / Baraz (voice) / Baraz (voice) / Crazy Yao / Spirit Frog / Hunter #2 (voice)

Dee Bradley Baker (49)

Naga / Pabu / Bum-Ju / Oogi / Tarrlok (voice) / Naga / Pabu / Oogi (voice) / Pepper (voice) / Mula (voice) / Helmsman / Concerned Evacuee (voice) / Furry-Foot (voice) / Helmsman / Earth Empire Captain / Pabu / Bunny Spirits (voice) / Bumi (voice) / Juicy (voice) / Bum-Ju (voice) / Poki / Pepper (voice) / Bull Frog (voice)

Kiernan Shipka (12)

Jinora (voice)

James Remar (58)

Tonraq (voice)

Darcy Rose Byrnes (13)

Ikki (voice)

Logan Wells

Meelo (voice)

Daniel Dae Kim (43)

Hiroshi Sato (voice)

Tom Kenny (49)

Referee (voice)

Lance Henriksen (71)

Lieutenant (voice)

D. B. Sweeney (50)

Aang (voice)

Rami Malek (30)

Tahno (voice)

Dave Thomas (62)

Additional Voices (voice)

Michael Yurchak (40)

Viper (voice)

Skyler Brigmann (13)

Kai (voice)

Richard Epcar (56)

Saikhan (voice) / Captain Saikhan / Warehouse Worker (voice) / Captain Saikhan / Two Toed Ping (voice)

Zelda Williams (22)

Kuvira (voice)

Eva Marie Saint (87)

Katara (voice)

Alex McKenna (27)

Senna (voice) / Additional Voices (voice)

George Coe (82)

Toza (voice)

Fisher Stevens (48)

Shady Shin (voice)

Stephen Root (60)

White Lotus Leader / Gommu / Chung (voice) / Gommu (voice)

Clyde Kusatsu (63)

Additional Voices (voice)