Below is a list of all cast members who have participated in creating If The Emperor Had a Text-To-Speech Device. This list include voice actors, writers, and commissioned artists and musicians. All names are listed alphabetically, as they are written by the credits in each video.

Cast Member Role(s)
Adeptus Adamaris Artist
Alfabusa Creator of 'If The Emperor Had a Text-To-Speech Device', Lead Animator, Lead Writer and VA for Wamuudes, Generic Ultramarines, Generic Salamanders, Regal Tailord Lorad Gatlington, Asmodai, Snurko, Fabius Bile, Little Billy, Helbrecht, Inquisitor Toddler-on-the-Ground, Grand Master Covan Leorac
Alisaihin Slaanesh
AkiGlancy Sylandri Veilwalker
Antfish Diavodes
Ares Random Scribe
Balthazaar007 Uriah Olathaire
BewareTheBun Sister Superior
CCRockChic The Entire Inquisition
Commissar Elusive The Entire Inquisition
Clay Herbert Kabalite Trueborn
ComradeCrimson Horus, Delphan Gruss, Vulkan, Typhus, Ghazghkull, Kryptman, Lyneus
Delred Ordo Hereticus Inquisitor
Dr. White Mechanicus Genators, Random Guardsman, Commander Shadowsun, Kairos Fateweaver, Detective Bruce Norring, Kadus, Pirate Deldar
Earndil Writer and VA for Grand Provost Marshal of the Adeptus Arbites, Epidemius, Random Commisar, Pink Horrors, Plaguebearers, Jebarion
EgoQueenAlexis Miriael Sabathiel
Eliphas the Inheritor Musician, artist, and VA for Grand Master Elirush, Plaguebearers.
Failsnake Writer and VA for Cegoarch and Random Dark Angel
FitzieArts Canoness Albia Thorne
Franky Dominique
The Fresh Sorcerer Goge Vandire, Master of the Administratum, Valjeanus, Gork & Mork, Arbitrator, Skarbrand, Corvus Corax, Tempestor Cromwell, Bloodletters, Pink Horrors, Plague Bearers, Daemonettes
Fusion Belial
Garrot Artist and VA for Confused Arbitrator, The Emperor's Spooky Skeleton Shriek, Random Tech-Priest
Gemineye Azrael, Kaldor Draigo, Malal, Random Grey Knight, Ulthwe Warlock, Scion Grant
George "Seoras" Exley Colonel 'Iron Hand' Straken
Glowtide Musician and VA for Fabricator-General of Mars
Gods-and-Kings Artist
Habbia Inquisitor Adrielle Quist
Haven Kendrick Karstodes, Khorne, The Deceiver
HelloFranFran Astropath Sassafras
HulkyKrow Kayvaan Shrike, Gabriel Angelos, General Sturnn, Screaming Mon'keigh, Random Grey Knight, Bloodletter, Pink Horrors, Plague Bearers
IMShadow007 Isha
Inkary Artist
Inquisitor OlonOctorok Writer
Ironbeard Uriel Ventris
Jaenette Schramm Canoness of the Order of the Sacred Rose
Karl the Deranged Assistant Animator and VA for Commander Militant of the Imperial Guard, Marneus Calgar, Inquisitor Javerticus, Random Peasant, Nurgle Daemon in Pus-covered cysts
Kirk Rowe The Entire Inquisition
KittKattAttack Wych, Canoness of the Order of Our Martyed Lady
Kiwi Tzeentch, Crazy Hassan, Gunnery Sergeant 'Stonetooth' Harker
Kochiha Ichihara Ecclesiarch Decius XXII, Cato Sicarius, He'Stan
Larry Luxus Nurgle, Larry the Drunk
Minotaur Kabalite Warrior
MissVile Masque of Slaanesh
Munkey Kabalite Warrior 1, Genestealer Cultist, Husbando Plaguebearer, Mortarion, Barbican Serf, Catachan Fang Wielder
Naerina Ulthwe Farseer, Heavy Bolter Sister, Lady Malys, and voiced the disclaimer at the beginning of 'Episode 1: The Last Church'
Noldofinve Artist
Nostalgia Artist, Writer, and VA for Alicia Dominica, Boy, Damsel in Distress, Generic Dire Avenger, Generic Daemonette, Generic Genestealer Cultist, Ephrael Stern, Drukhari Driver
Oculus Imperia Abducted Chronicler
Pythorogus Musician
Raecheveyc Random Sororitas
Randolph Carter Writer and VA for The Emperor, Asdrubael Vect, Inriam's Spectre, Star Child
Remleiz Cyberdong, Grey Knight 1, Scion Priestly
RudeRubicante Artist
Sadia Chaplain Grimaldus
Shas'O Swoll The Entire Inquisition
Sierra Tyranid Hivemind
SleepyDraw Artist (the page is a stub though)
SpikyRhinoBox Random Astartes
Snipe and Wib The Lost Phantom Titan of Mor-rioh'i, Saint Celestine (Snipe), Scion Matilda (Snipe), Obiwan Sherlock Clousseau (Wib)
StellarElite Fyodor Karamazov, Rune Priest Volund, Apothecary Wilford, Chaplain Mikelus, The Squats
StephanieSwanQuills Timothy's Handler
Stringstorm Musician and VA for Vraesque Malidrach, Ferrus Manus, Mayor Brimstone
Superanchors Writer and VA Torquemada Coteaz, Rogal Dorn, Night Reaper Wielder
Takahata101 Abaddon the Despoiler
TheLemonGrenade Custodisi, Nurgle Daemon Wife, Tu'Shan, Hevestuli
ThunderPsyker Little Kitten, Magus, Archon Akhara'keth, Scion Stuart, Tahril
Tim Pederson Furie Secretary
Tim Valencia Stormtrooper
Tindabox Daemonettes
Valrak Khaine
Verry Cypher
Vodkason Artist
Voyboy Scion Valentine
Voytek Writer
Yohan Gasmask Writer and VA for Generic Blanks, Sexually Depraved Warpsmith, Ahzek Ahriman, Blaktoof, Lucius the Eternal Perturabo, Calato
Zegram Magnus the Red, Inquisitor Headsmash, Generic Genestealer Cultist, Great Horned Rat
Zoran The Bear Hobo Guardsman, Leman Russ, DEVIL'S CLAAAAAW Wielder, Random Commissar

Some of the cast are listed as writers even thought they aren't credited as writers on their respective pages. Anyone with an 'Episodes Written' section on their page has been listed listed as a writer, e.g. Randolph Carter, has been listed as writer as he has a credit to being a writer for Episode 26 and special 5, despite his official role not being a writer.