 | Chloë Grace Moretz als Nimona (voice) |
 | Riz Ahmed als Ballister Boldheart (voice) |
 | Eugene Lee Yang als Ambrosius Goldenloin (voice) |
 | Frances Conroy als The Director (voice) |
 | Lorraine Toussaint als Queen Valerin (voice) |
 | Beck Bennett als Sir Thoddeus Sureblade (voice) |
 | RuPaul als Nate Knight (voice) |
 | Indya Moore als Alamzapam Davis (voice) |
 | Julio Torres als Diego the Squire (voice) |
 | Sarah Sherman als Coriander Cadaverish (voice) |
 | ND Stevenson als Kwispy Dwagon (voice) |
 | Mia Collins als Demon Baby (voice) |
| Zayaan Kunwar als Young Ballister (voice) |
| Charlotte Aldrich als Young Gloreth / Additional Voices (voice) |
 | Karen Ryan als Gloreth / Sir Kahren Reehyan / Additional Voices (voice) |
 | Nick Bruno als Sir Nicholas Brun / Additional Voices (voice) |
 | Troy Quane als Sir Troy Quartermane / Additional Voices (voice) |
 | Julie Zackary als Sir Jule Zakaria / Additional Voices (voice) |
 | Randy Trager als Sir Randall Editus / Additional Voices (voice) |
| Christopher Campbell als Sir Gottem Lilmush (voice) |
| Cindy Slattery als Syntheya - Voice of the Kingdom / Additional Voices (voice) |
| Matthew J. Munn als Announcer (voice) |
| Sommersill Tarabek als Institute Analyst / Additional Voices (voice) |
| Sebastian Trager als Danks Kid (voice) |
| Sadie Trager als Concerned Citizen #1 (voice) |
| Taryn Bruno als Concerned Citizen #2 (voice) |
| Lincoln Davis als Goldenloin Fan #1 (voice) |
| Lylianna Eugene als Patience / Additional Voices (voice) |
| Tim Nordquist als Zombie Movie Voice #1 (voice) |
 | Maurissa Horwitz als Zombie Movie Voice #2 / Additional Voices (voice) |
| Jake Bruno als Game Commercial Kid #1 / Additional Voices (voice) |
| Jarrett Bruno als Game Commercial Kid #2 / Additional Voices (voice) |
| Wesley Turner als Additional Voices (voice) |
| Nick Bruno | Director |
| Troy Quane | Director |
| Roy Lee | Producer |
| Karen Ryan | Producer |
| Julie Zackary | Producer |
| Robert L. Baird | Executive Producer |
| Megan Ellison | Executive Producer |
| Andrew Millstein | Executive Producer |
| Robert L. Baird | Screenplay |
| Lloyd Taylor | Screenplay |
| Robert L. Baird | Story |
| Lloyd Taylor | Story |
| Pamela Ribon | Story |
| Nick Bruno | Story |
| Troy Quane | Story |
| Keith Bunin | Story |
| Marc Haimes | Story |
| Andrew Childs | Co-Producer |
| John Powers Middleton | Executive Producer |
| Patrick Osborne | Co-Producer |
| ND Stevenson | Co-Producer |
| Corey Turner | Associate Producer |
| Randy Trager | Editor |
| Aditya Deosthale | Production Manager |
| ND Stevenson | Graphic Novel |
| Christophe Beck | Original Music Composer |
| Niv Adiri | Sound Re-Recording Mixer |
| Glenn Freemantle | Supervising Sound Editor |
| Glenn Freemantle | Sound Designer |
| Richard Spooner | Sound Re-Recording Mixer |
| Kate Hansen-Birnbaum | Casting Associate |
| Lexi Diamond | Casting Assistant |
| Esteban Bravo | Story Artist |
| Travis Blaise | Story Artist |
| B.J. Crawford | Character Designer |
| José Manuel Fernández Oli | Character Designer |
| Jason Sadler | Character Designer |
| Dan Seddon | Character Designer |
| Annlyn Huang | Character Designer |
| Ron DeFelice | Color Designer |
| James Gilliard | Color Designer |
| Michael Lee | Color Designer |
| Hyesung Park | Color Designer |
| Aziz Kocanaogullari | Animation |
| Jony Chandra | Head of Story |
| Erin Crackel | Editor |
| Kevin Reher | Casting |
| Natalie Lyon | Casting |
| Libby Thomas Dickey | Casting |
| Theodore Anthony Lee Ty | Animation Director |
| Anthony Kemp | Digital Producer |
| Archie Donato | Visual Effects Supervisor |
| K.Flay | Songs |
| Aidan Sugano | Production Design |
| Jeff Turley | Production Design |
| Kier Lehman | Music Supervisor |
| Ben Barker | Other |
| Kaitlyn Jorge Czepiga | Production Supervisor |
| Haley Brooks Pascarella | Production Supervisor |
| Cindy Slattery | Production Supervisor |
| Erica Ashley Pulcini | Other |
| Yancy Lindquist | Visual Effects Supervisor |
| Heather Larkin | Story Supervisor |
| Pamela Ribon | Other |
| ND Stevenson | Other |
| Ian Southwood | Other |
| Ian Jude Mcintosh | Production Manager |
| Sharmila Venugopal | Production Manager |
| Spencer Bacon | Thanks |
| Roberto Calvo | Thanks |
| Dean DeBlois | Thanks |
| Karen Disher | Thanks |
| Effie Fradelakis | Thanks |
| Kendall Holly | Thanks |
| Clare Knight | Thanks |
| Calvin Q. Lam | Thanks |
| Steve Martino | Thanks |
| Rebecca McVeigh | Thanks |
| Tito Ortiz | Thanks |
| Andrew Stanton | Thanks |
| Chris Wedge | Thanks |
| Chris Williams | Thanks |
