Not putting Unicron on this list because I refuse to read it until OP #22

Optimus Prime #20

Optimus: Peter Cullen (TFP Reprisal in present, G1 Reprisal as Orion)
Bumblebee: Will Friedle in present (TFP Reprisal), Johnny Young Bosch in past (WFC reprisal)
Starscream: Steve Blum (TFP Reprisal)
Soundwave: Frank Welker (G1 Reprisal)
Aileron: Christine Lakin (Pebee, Mass Effect Andromeda)
Jetfire: Scott Menzel (Robin, Teen Titans)
Mistress of Flame: Emilia Clarke (Daenerys, Game of Thrones)
Elita 1: Genevive O' Riley (Moira, Overwatch)
Marissa: Erin Yvette (Snow White, The Wolf Among Us)

Shockwave: David Sobolov (TFP Reprisal)
Liege Maximo: Tom Hiddleston (Loki, MCU)

Lost Light #19 and #20

Rodimus: Troy Baker (Rhys, Tales from the Borderlands)
Cyclonus: Fred Tatiscoire (Soldier 76, Overwatch)
Whirl: Troy Hall (Tripp, The Walking Dead: A New Frontier)
Ratchet:Jeffery Combs (TFP Reprisal)
Drift: Alex Hernandez (David, The Walking Dead: A New Frontier)
Tailgate: Mitchell Whitfield (RiD15 Fixit)
Brainstorm: Jason Biggs (Leonardo Seasons 1-2, TMNT 2012)
Rung: Rob Paulsen (Donatello, TMNT 2012)
Swerve: Steve Blum (Zeb, Star Wars Rebels)
Nautica: Ashley Johnson (Ellie, The Last of Us)
Velocity: Nikki Rapp (Lily, The Walking Dead)
Anode: Bex-Taylor Klaus (Pidge, Voltron Legendary Defender
Lug: Camilla Lufton (Tracer, Overwatch)

First Aid: Seth Green (Seasons 3-5 Leonardo, TMNT 2012)
Riptide: Steve Blum (Dempsey, Call of Duty Zombies)
Thunderclash: Kyle Hebert (Adult Gohan, Dragon Ball Super)

Krok: Josh Keaton (Shiro, Voltron Legendary Defender
Misfire: Greg Cipes (Michelangelo, TMNT 2012)
Crankcase: James Arnold Taylor (Ratchet, Ratchet and Clank)
Fulcrum: Steven Yeun (Keith, Voltron Legendary Defender)
Spinster: David Vincent (Robin, Fire Emblem)
Nickel: Tara Strong (Sari, TFA)

Getaway: Sean Astin (Raphael, TMNT 2012)
Scorponok: Clancy Brown (Silas, TFP)
Star Saber: Gary Chalk (BW Optimus Primal)

 

Fresh off my third re-read of issue #19 and my second re-read of #20, here's the first time I'm posting an entire list of my stunt-cast of the 'Bots and 'Cons of MTMTE and LL! It's by no means comprehensive, I just wanted to share the more notable voices I use in my head when I read the comics. In the case where I don't have a specific VA in mind yet, I tried to describe the texture or timbre of voice that I find fitting.

In order of (speaking) appearance:
Misfire = John Mulaney
Swerve = Doc Hammer as Henchman 21 on The Venture Bros.
Krok = Alfred Molina as Lex Luthor on Robot Chicken
Drift = "Jacob" ClothoBuerocracy from Team Train-Wreck's dub
Rodimus = ""Conner Brownlee" everyday-conman from Team Train-Wreck's dub
Anode = Rikki Lindhome
Velocity = Grace Rolek
Ratchet = Jeffrey Combs
Rung = James Urbaniak
Nickel sounds like a naggy British mum, voice-pitched up but not to chipmunk levels, just appropriate to her stature
Fulcrum = Riz Ahmed (SW Rogue One)
Tailgate = Sue Blu from the BotCon 2014 script reading
Brainstorm sounds like a British Adam Savage, but with a voice about as low as Jamie Hyneman, if that descriptor makes sense
Nautica = Jenna Coleman
Ultra Magnus = Jack Angel from the BotCon 2014 script reading
Rewind = Crashboombanger from "Rewind's last message"
Chromedome = "Connor McKinley" senilesnake from Team Train-Wreck's dub
Roller = Phil LaMarr (Justice League Unlimited)
Lug = Kate Miccuci
Grimlock = Fred Tatasciore
Crankcase = Clancy Brown
First Aid = Arthur Darvill
Getaway has a Kiwi accent, as James Roberts once said, but not the funny "Polynesian bouncer" archtype
Tyrest = Tom Kane (SW Clone Wars)
Whirl = Nolan North as Deadpool, both his speaking voice and internal voices
Scraplet Gestalt = Dee Bradley Baker
Cyclonus = Clancy Brown
Spinister = Steve Carell ("I love lamp")
Scorponok has a slight Hispanic accent, because of the remnant of Abraham Dante's Headmaster bond
Star Saber = Yuri Lowenthal

 

I feel like it goes without saying that Unicron should, most of the time, be read with Orson Welles in mind. I mean, besides him we only have two other examples, and John Noble's Unicron doesn't feel like it would fit with IDWnicron.

 

To me, Swindle would sound like Billy Mays.

 

tarn-tim curry

 

Nah. He's Vince "Slap Chop" Offer. Are you following him, camera guy? 'Cause you're gonna love his nuts.

 

Optimus Prime #21

Optimus: Peter Cullen (TFP Reprisal in present, G1 Reprisal as Orion)
Bumblebee: Will Friedle in present (TFP Reprisal), Johnny Young Bosch in past (WFC reprisal)
Starscream: Steve Blum (TFP Reprisal)
Soundwave: Frank Welker (G1 Reprisal)
Needlenose: C. Thomas Howell (Captain Cold, Injustice 2)
Windblade: Kristy Wu (RiD15 Reprisal)
Arcee: Sumalee Montano (TFP Reprisal)
Aileron: Christine Lakin (Pebee, Mass Effect Andromeda)
Jetfire: Scott Menzel (Robin, Teen Titans)
Mistress of Flame: Emilia Clarke (Daenerys, Game of Thrones)
Elita 1: Genevive O' Riley (Moira, Overwatch)
Marissa: Erin Yvette (Snow White, The Wolf Among Us)

Shockwave: David Sobolov (TFP Reprisal)
Liege Maximo: Tom Hiddleston (Loki, MCU)

Lost Light #21

Rodimus: Troy Baker (Rhys, Tales from the Borderlands)
Cyclonus: Fred Tatiscoire (Soldier 76, Overwatch)
Whirl: Troy Hall (Tripp, The Walking Dead: A New Frontier)
Ratchet:Jeffery Combs (TFP Reprisal)
Drift: Alex Hernandez (David, The Walking Dead: A New Frontier)
Tailgate: Mitchell Whitfield (RiD15 Fixit)
Brainstorm: Jason Biggs (Leonardo Seasons 1-2, TMNT 2012)
Rung: Rob Paulsen (Donatello, TMNT 2012)
Swerve: Steve Blum (Zeb, Star Wars Rebels)
Nautica: Ashley Johnson (Ellie, The Last of Us)
Velocity: Nikki Rapp (Lily, The Walking Dead)
Anode: Bex-Taylor Klaus (Pidge, Voltron Legendary Defender
Lug: Camilla Lufton (Tracer, Overwatch)

First Aid: Seth Green (Seasons 3-5 Leonardo, TMNT 2012)
Riptide: Steve Blum (Dempsey, Call of Duty Zombies)
Thunderclash: Kyle Hebert (Adult Gohan, Dragon Ball Super)

Krok: Josh Keaton (Shiro, Voltron Legendary Defender
Misfire: Greg Cipes (Michelangelo, TMNT 2012)
Crankcase: James Arnold Taylor (Ratchet, Ratchet and Clank)
Fulcrum: Steven Yeun (Keith, Voltron Legendary Defender)
Spinster: David Vincent (Robin, Fire Emblem)
Nickel: Tara Strong (Sari, TFA)

Scorponok: Clancy Brown (Silas, TFP)

Spoiler

Pharma: Mark Hamill (Ozai, Avatar The Last Airbender)
Megatron: Frank Welker (TFP Reprisal)

 

Idk who, but I want Wayne June (the narrator from the darkest dungeon) to voice anybody. So far my only real idea is Tarn, shockwave, or maybe even a replacement Cullen.

 

Rodimus should sound like Scout from TF2.

 

The latest version of my list. Not posted in a while, but decided that this forum needs a break from all the repetitive “No More X” threads.

My deceased list is not entirely up to date, due to issues with my server. Let me know if there are any errors.

IDW Fantasy Casting

Autobots:
Optimus Prime: Peter Cullen.
Bumblebee: Will Friedle
Jetfire: Troy Baker
Arcee: Stevie Vallance (Tigrerra, Bakugan Battle Brawlers)
Sky Lynx: Dee Baker
Prowl: Alistair Abell
Ironhide: Jess Harnell
Red Alert: Brian Dobson
Superion: Paul Dobson
Flame: Michael T Weiss (Etrigan, Justice League)
Fortress Maximus: Steve Blum
First Aid: Michael Bell
Riptide: Carlos Alazraqui (Bane, Justice League Doom)
Thunderclash: Travis Willingham (Superman, Lego Batman 2)
Cerebros: Steve Kramer
Thundercracker: Andre Sogliuzzo
Blackrock: Michael Fassbender (Steve Jobs, the biopic)Michael Donovan (Primus, Transformers Cybertron)
Outrigger: Dana Snyder
Tracks: Billy West (Judge Whitey, Futurama)
-Springer: Neil Ross

Decepticons
Soundwave: Frank Welker (no processing)
Rumble and Frenzy: Tom Kenny
Slugslinger: Peter Cullen
Squeezeplay: Brian Drummond (Jetstorm, Transformers Beast Machines)
Needlenose: Don Brown (Cyclonus, Transformers Armada)
Bludgeon: Ken Wannatabe (Drift, Transformers film series)
Menasor: James Arnold Taylor
Motor Master: Liam O’Brien
Dead End: Crispin Freeman
Offroad : Mikey Kelley (Heatseeker, Transformers Robots in Disguise)
Breakdown: Matthew Toffolo (YouTube user Batmanmarch)
Drag Strip: Maurice LaMarche
Swindle: Michael Lindsay (Rollbar, Transformers: Robots in Disguise)
Skullcruncher: Bill Faggerbakke
Lockdown: Mark Ryan
Waspinator: Scott McNeil.
Onslaught: Bob Papenbrook (Mega-Octane, Transformers: Robots in Disguise)
Blast Off: Robert Axelrod (Movor, Transformers: Robots in Disguise)
Brawl: Richard Epcar (Armorhide, Transformers: Robots in Disguise)
Vortex: Neil Kaplan (Ro-Tor, Transformers: Robots in Disguise)
Starscream: Michael Dobson/Frank Todaro/Steve Blum
Swift: Katie Griffin (Raye Hino, Sailor Moon)
Agonizer: Charlie Schlatter
Deathsaurus: Robert Tinkler (Rubeus, Sailor Moon)
Turmoil: Tony Todd (Astaroth, Batman the Brave and the Bold)
Gigatron: Daniel Riordan
Hellbat: Barry Stigler (Scourge, Transformers Robots in Disguise)
Grit: Peter Cugno (Ren, Bakugan)
Knockout: Alex House (Ace, Bakugan New Vestroia)
Acid Storm: Dee Bradley Baker

Lost Light
-Rodimus: Richard Gautier
-Ultra Magnus: Jack Angel
-Minimus Ambus: Tony Daniels (Jadeite, Sailor Moon)
-Drift: Denis Akiyama (Malachite, Sailor Moon)
-Ratchet: Ron Rubin (pre-Chaos), Jeffery Combs (post-Chaos)
-Rung: Fred Tatasciore
-Chromedome: Toby Proctor (Tuxedo Mask, Sailor Moon episodes 12-65)
-Whirl: Adam Baldwin or Terry Klassen (Six Shot, Transformers Energon)
-Cyclonus: Kevin Lund (Nephrite, Sailor Moon)
-Tailgate: Susan Blu
-Brainstorm: Leighton Cardno (Kilobyte, Power Rangers RPM)
-Swerve: Michael Lockwood Crouch
-Megatron: Frank Welker
-Nightbeat: Benedict Cumberbatch (Sherlock, Sherlock)
-Nautica: Alyson Court (Mira, Bakugan New Vestroia)
-Rewind: Scott McCord
-Velocity: Rachel Stirling
-Roller: Brian Drummond
-Anode: Annick Obanaswin
-Lug: Laurie Hymes
-Crosscut: Paul Dobson (Rodimus, Transformers Energon)
-Blaster: Bumper Robinson (Rook, Ben 10 Omniverse)
-Bluestreak: Matthew Lilliard
-Hoist: Steve Kramer
-Perceptor: Paul Eilding
-Defensor: Steve Blum
-Hot Spot: Dan Gilvazean
-Groove: Phil LaMarr
-Blades: Daniel J Edwards (Aigami, Yu-Gi-Oh! The Dark Side Of Dimensions)
-Streetwise: Peter Cullen
-Mirage: Wally Wingert

Scavengers
-Fulcrum: Dee Bradley Baker
-Spinister: Scott McCord
-Misfire: Stan Jones
-Krok: David Lodge (Loki, Power Rangers Lightspeed Rescue)
-Crankcase: Lyon Smith (Sapphire, Sailor Moon)
-Grimlock: Greg Berger
-Nickel: Sandy Fox (T-AI, Transformers: Robots in Disguise)

Dinobots
Slug: Neil Ross
Sludge: John DiMaggio
Snarl: Dee Bradley Baker
Swoop: Tony Robinson
Strafe: Sarah LaFleur (Amara Tenoh, Sailor Moon S)

Other Cybertronians:
Shockwave: Steve Blum(post Shadowplay) Corey Burton (pre Shadowplay) Robert Axelrod (as Onyx Prime) (Lord Zedd, Power Rangers)
Skywarp: Scott Whyte
Fat Tankor: Paul Dobson

Camiens
Windblade: Erica Lindbeck
Firestar: Emilie Barlow (Courtney, Total Drama)
Victorion: Kari Wahlgren
Chromia: Julie Lemieux (Lars Lion, Bakugan Battle Brawlers)
Hot Shot: Kirby Morrow
Afterburner: Trevor Devall (Bruticus Maximus, Transformers Energon)
Lightbright: Stephanie Anne Mills (Princess Fabia, Bakugan Gundalian Invaders)
Pyra Magna: Linda Ballantyne
Stormclash: Emilie Barlow
Skyburst: Barbara Radecki (Sailor Neptune, Sailor Moon)
Rust Dust: Stacey DePass
Dust Up: Julie Lemieux
Jumpstream: Sarah LaFleur
Aileron: Jennifer Hale (Sam, Totally Spies)
Midnight Express: David Lodge
Stardrive: Jennifer Gould (Sailor Saturn, Sailor Moon)
Flamewar: Jennifer Hale
Proxima: Tara Strong

Velocitronians
Knock Out: Daran Norris
Moonracer: Bailey Stocker
Roulette: Stacey DePass (Emma, Total Drama Presents: The Ridonculous Race)

Eukarians
Tigatron: Blu Mankuma
Airazor: Tabitha St. Germain (Alexis, Transformers Armada)
Centurion: Dan Gilvazean (Bumblebee, The Transformers)
Bump: Samuel Vincent

Devisens
Vanquish and Fireshot: Roger Craig Smith (Jetstorm and Slipstream, Transformers Robots in Disguise)
Slide: Kira Buckland (Alix Kubdel, Miraculous: Tales Of Ladybug And Cat Noir)

Carcerians
Elita-one: Mary Elizabeth McGlynn
Obsidian: Hadley Kay (Nurzak, Bakugan Gundalian Invaders)
Strika: Tara Strong

Junkions
Wreck-Gar: Kelson Henderson
Rum-Maj: Susan Roman

Humans:
Verity: Tabitha St. Germain
Marrissa Faireborn: Susan Blu
Ian Noble/Action Man: Robin Atkin Downes (Manchester Black, Superman vs the Elite)
The President: Roz Ryan
Richard Ruby: Frank Welker (Walter Cronkite impersonation)
J. J Hackensack: Steve Blum

The Micronauts
Oz Rael: Carter Hayden (Noah, Total Drama)
Phenolo-Phi: Stephanie Anne Mills (Chan Lee, Bakugan Battle Brawlers)
Acoyear: Scott McCord (Percival, Bakugan New Vestroia)
Microtron: Rob Tinkler
Larissa: Novie Edwards.
Biotron: Dan Petrijenovic (Aranaut, Bakugan Gundalian Invaders)
The Time Traveller: Billy Bob Thompson

The Visionaries
Merklynn: Corey Burton
Leoric: Joe Motiki
Virulina: Alyson Court
Cindarr: John Stocker.
Arzon: Jeremy Harris
Ectar: Crispin Freeman
Witterquick: Lyon Smith
Galadria: Megan Fahlenbock
Cravex: Julien Olsen
Lexor: Carmen Melville
Feryl: Barbara Mamabolo
Cryotek: Clé Bennett
Mortdredd: Andrew Sabiston
Reekon: Eric Stuart

The Iron Ring
Joe Colton/Baron Ironblood: Kerrigan Mahan (Edwin Alva, Static Shock) Hadley Kay [as Baron Ironblood] (Nurzak, Bakugan Gundalian Invaders)
Miles Mayhem: Mike McShane
Dr. Mercy Gale: Kathy Laskey
Storm Shadow II/Tempest: Sabrina Grdevich
Destro: Phil Lamarr
Shazraella Karza: Katie Griffin (Mistress Sellon, Bakugan Mechtanium Surge)
The Iron Klaw: Dee Bradley Baker
Tomax Paoli: Marc Thompson (Chazz Princeton, Yu-Gi-Oh! GX)
Dr. Mindbender: LittleKuriboh (Moonlight Knight, Sailor Moon Abridged) (Yami Yugi when disguised as Ironblood)

GI Joe
Scarlett: Grey Griffin
Roadblock: Phil Lamarr
Quick Kick: Peter Kelamms (Wing Saber, Transformers Cybertron)
Rock’N’Roll: Dan Petrijenovic
Matt Trakker: Joe Motiki
Ayana Jones/Mayday: Michelle Morgan (Sharon, Static Shock)
MP3: Phil LaMarr
Spike Witwicky: Michael Liscio Jr.
Talon: Lee Byung-Hun

The Knights of the Solstar Order
Rom: Tyrone Savage (Matthias, Redwall)
Livia: Julie Lemieux
Sata: Emily Jeness (Cynthia, Pokémon)

Other
Mike Power: Robin Atkin Downes (old), Tress McNeille (young)
Baron Hraal Karza: Shaun Meunier (Mag Mel, Bakugan Mechtanium Surge)
My First Blaster: Tom B. Long

Deceased
Kup: John Stephenson
Pharma: Mark Hamill (Crybaby Clown, Scooby-Doo Mystery Incorporated)
Ten: Ben Pronsky
Hubcap: Will Friedle
Sentinel Prime: Tyrone Savage (Coredegon, Bakugan Mechtanium Surge)
Fangry: Rob Tinkler (Helios, Bakugan New Vestroia)
Horri-Bull: Mark Acheson (Crumplezone, Transformers Cybertron)
Runabout: John D. Collins
Runamuck: Nicholas Frankau
Scrapper: Michael Bell
Galvatron: Frank Welker, Ron Pardo (as the D-Void)(Hal-G, Bakugan Battle Brawlers)
Ramjet: Colin Murdoch (Thrust, Transformers Armada)
Rapidfire: Vic Minogna
Atomizer: Matthew Broderick
Ambulon: Josh Keaton
Pipes: Hal Rayle
Trailbreaker: Paul Dobson (Overhaul, Transformers Cybertron)
Ravage: Scott McNeil (Dinobot, Beast Wars: Transformers)
Rewind: Scott McCord
Kaput: Dee Bradley Baker
Flywheels: Terry Klassen

DJD
Tarn: Keith David (masked), Todd Lasance (unmasked)
Vos: John Kassir
Kaon: Robin Atkin Downes
Helex: Rick D Wasserman
Tesarus: Clancy Brown

Skids: Vince Corazza (Darien, Sailor Moon episodes 65-159)
Guzzle: Kyle McDonald (Taylean, Bakugan Mechtanium Surge)
-Pyro: Ty Olsson (Downshift, Transformers Energon)
-Ironfist: Terry Klassen
-Roadbuster: Bill Faggerbakke (Ronnie Raymond, Batman the Brave and the Bold)
Dai Atlas: Lex Lang (Ecliptor, Power Rangers in Space)
Necrobot: Stuart Devenie
Jihaxus: Scott McCord (Frosch, Bakugan Battle Brawlers)
Metalhawk: Charlie Adler (Eric Raymond, Jem)
Nova Prime: John Stocker, Andrew Pifko (flashbacks) (Naga, Bakugan Battle Brawlers)
Prima: Wayne Grayson
Alpha Trion: Neil Kaplan
Micronus Prime: Adrien Pasdar
Vector Prime: Richard Newman
Alchemist Prime: Keith Ferguson.
Megatronus: John Leigh (Octomus, Power Rangers Mystic Force) Cassandra Morris (young) (Yubel, Yu-Gi-Oh! GX!)
Solus Prime: Olivia d’Abo (Star Sapphire, Justice League)
Oiler: Matt Hill
Ophion: Zachary Bennett (Apollonir, Bakugan)
Dominus Ambus: Michael Alston Bailey
Override: Nicole Oliver
Clocker: Brian Dobson
Wheeljack: Christopher Swindle
Cheetor: Ian Corlett
Dinobot: Andrew Jackson (Wolfurio, Bakugan Mechtanium Surge)
Sonar: Samantha Newark
Manta Ray: Ron Rubin
The Mistress of Flame: Susan Aceron (2015-16)(Sailor Pluto, Sailor Moon S), Karen Strassman (2017-18)
Omega Supreme: Scott McNeil
Mainframe (GI Joe): Robin Atkin Downes
Blurr: Brian Drummond.
Buzzsaw: Stadler
Laserbeak: Waldorf
Scorponok: Colin Murdoch
Overlord: John Simm
Dreadwing: Tony Todd
-Getaway: John Tui
- Star Saber: Mick Wingert (the Vigilante, Arrow)
-Froid: Richard Green (Hugo Strange, The Batman)
-Sunder: Richard Green (Benmummy, Ben 10)
-Impactor: Mike Reynolds (Railspike, Transformers: Robots in Disguise)
-Scoop: Michael Daingerfield
Tyrest: Timothy Dalton
Tarantulas: Alec Willows
Liege Maximo: Martin Billany (LittleKuriboh) (first appearance), Troy Baker (later appearances)(Van Kleiss, Generator Rex)
Bonecrusher: Troy Baker (Biowolf, Generator Rex)
Hook: John DiMaggio (Faceless Hunter, Batman the Brave and the Bold)
Scavenger: Andre Sogliuzzo
Mixmaster: Tamir Cousins (Mani, Yu-Gi-Oh! The Dark Side Of Dimensions)
Long Haul: Gregg Berger
Gimlet: Doug Parker (Terrorsaur, Beast Wars: Transformers)
Caleb Awan: Dan Petrijenovic (Spectra, Bakugan New Vestroia)
The Magnificence: Trevor Devall (Alpha Q, Transformers Energon)
The Grand Architect: Trevor Devall

 

Hmm... with a few exceptions this will probably be a *very* UK television flavoured cast list - as those tend to be the voices I attach to comic characters if I try to imagine their words spoken aloud. Doctor Who fans will probably recognise most of the names; others likely won't.

Optimus Prime: Peter Cullen
Megatron: William Russell (Ian Chesterton, to Doctor Who fans)
Rodimus: David Tennant
Rung: Peter Capaldi
Ratchet: William Hartnell
Brainstorm: Benedict Cumberbatch
Pharma: John Simm
Tarn: Gabriel Woolf (Sutekh, to Doctor Who fans)
Ultra Magnus: Chris Barrie (Arnold Judas Rimmer, of Red Dwarf, probably doing his 'Ace' voice when armoured).
The Grand Architect: Richard Briars, putting on his most nasal inflection "... and that's for raising your voice!"
Cyclonus: William Gaunt

Tailgate: Carole Ann Ford (Susan Foreman, to Doctor Who fans)​

 

I read Brainstorm with Jeff Goldblum's voice. Full Ian Malcolm sarcasm.

 

Ever since Prime, Ultra Magnus can only have one voice for me: Michael Ironside.

 

Has he ever done a British accent with any of his roles or characters? I can't help but read Brainstorm with an accent cos of how Roberts writes him, and I think Goldblum has the vocal texture I'm looking for.

 

Paul Reubens as Starscream.
Corey Burton as Shockwave, but with his traditional performance pre-Emuprata and a Sobolov-style monotone after. Lee Tockar as Makuta as Onyx Prime.
Mindy Sterling as Arcee.
Peter Weller as Impactor.
Then mixing it up a bit with Frank Welker as Galvatron, Michael Ironside as Megatron, and Michael Dobson as Ultra Magnus.

 

Well, this is gonna be depressing AF knowing half of them are dead, but, here we go...

Unicron #1-4

Optimus Prime: Peter Cullen (TFP Reprisal)
Bumblebee: Will Friedle (TFP Reprisal)
Windblade: Kristy Wu (RiD15 Reprisal)
Arcee: Sumalee Montano (TFP Reprisal)
Aileron: Christine Lakin (Peebee, Mass Effect Andromeda)
Soundwave: Frank Welker (G1 Reprisal)
Starscream: Steve Blum (TFP Reprisal)
Ironhide: Gavin Hammon (Kenny, The Walking Dead Telltale Series)
Leoric: Dave Fennoy (Lee, The Walking Dead Telltale Series)
Pyra Magna/Victorion: Lydia Mackay (Athena, Borderlands Series)
Jetfire: Scott Menville (Robin, Teen Titans)

Prowl: Scott Porter (Robin, Injustice 2)
Stardrive: Myrcella Lyntz-Pope (Corrin, Fire Emblem Fates)
Chromia: Luara Bailey (Fiona, Tales from the Borderlands)

Unicron: Orson Welles (G1 Reprisal)
Shockwave: David Sobolov (TFP Reprisal)
Bludgeon: Eric Bauza (RiD15 Drift)

Wheeljack: Chris Latta (G1 Reprisal)
Mistress of Flame: Emilia Clarke (Daenerys, Game of Thrones)
Blurr: Roger Craig Smith (Sonic the Hedgehog, Sonic Series)
Elita-1: Genevive O'Reily (Moira, Overwatch)
Cosmos: Tyler Labine (Hunk, Voltron Legendary Defender)

Marissa: Erin Yvette (Snow White, The Wolf Among Us)
Scarlett: Grey Griffin (Nova, Starcraft 2)
Joe Colton: Richard Epcar (Joseph Joestar, Jojo's Bizarre Adventure)
Skywarp: Frank Welker (G1 Reprisal)


Optimus Prime #23

Slide: Gideon Adlon (Violet, The Walking Dead The Final Season)
Midnight Express: Chandler Riggs (Carl, The Walking Dead)
Roulette: Mae Whitman (April, Teenage Mutant Ninja Turtles 2012)
Gimlet: Sophia Isabella (Cyberverse Windblade)
Bump: Norman Reedus (Ralo, Voltron Legendary Defender)

Jazz: Phil LaMarr (Sam B, Dead Island Series)
Slug: Steve Blum (Raxar, Heroes of the Storm)

Spike: Matt Mercer (Jotaro, Jojo's Bizarre Adventure)
Mainframe: Doug Erholtz (Polnareff, Jojo's Bizarre Adventure)

Lost Light #23

Rodimus: Troy Baker (Rhys, Tales from the Borderlands)
Megatron: Frank Welker (TFP Reprisal)
Drift: Alex Hernandez (David, The Walking Dead A New Frontier)
Ratchet: Jeffery Combs (TFP Reprisal)
Cyclonus: Fred Tataiscore (Soldier 76, Overwatch)
Tailgate: Mitchell Whitfield (RiD15 Fixit)
Nautica: Ashley Johnson (Ellie, The Last of Us)
Velocity: Nicki Rapp (Lily, The Walking Dead Season One)
Whirl: Anthony Ingruber (Joker, Batman The Telltale Series)
Swerve: Steve Blum (Zeb, Star Wars Rebels)
Anode: Bex-Taylor Klaus (Pidge, Voltron Legendary Defender)
Lug: Cara Theobold (Tracer, Overwatch)
Riptide: Steve Blum (Dempsey, Call of Duty Zombies)
First Aid: Seth Green (Leonardo, TMNT 2012)
Thunderclash: Kyle Hebert (Kakyoin, Jojo's Bizarre Adventure)

Grimlock: Khary Payton (RiD15 Reprisal)
Krok: Jason Biggs (Leonardo, TMNT 2012)
Spinster: David Vincent (Robin, Fire Emblem Series)
Crankcase: James Arnold Taylor (Ratchet, Ratchet and Clank)
Misfire: Greg Cipes (Michelangelo, TMNT 2012)
Fulcrum: Steven Yeun (Keith, Voltron Legendary Defender)
Nickel: Tara Strong (TFA Sari)

Rung/Primus: Rob Paulsen (Donatello, TMNT 2012)
Pharma/Adaptus: Mark Hamill (Ozai, Avatar The Last Airbender)
Tyrest/Solomus: Patrick Seitz (Artanis, Starcraft 2)

 

Alright, let me do this again too.

Optimus - Cullen
Bee - Johnny Bosch
Windblade - Brenda Song
Ironhide - Keith Szarabajka
Chromia - Sumalee Montanno
Jazz - Phil LaMarr
Prowl - Jeff Bennett
Dinobots - FOC voice cast
Jetfire - Troy Baker
Alpha Trion - Phil LaMarr
Arcee - If I were adapting IDW for Netflix or something, I’d cast a transgender woman. But for the sake of this, I’ll say Vanessa Marshall
Starscream - Sam Riegel
Soundwave - Frank Welker
Combaticons - FOC voice cast with the exception of Dave Boat doing Blast Off instead
Shockwave - I’m REALLY stuck on Steve Blum even though he was pretty damn bland as High Moon Shockwave.
Galvatron - Djimoun Hounsou
Elita One - Patti LuPone
Obsidian, Strika, and assorted BW and BM characters - any of their surviving original actors
Aileron - Anika Noni Rose

Rodimus - Chris Pratt
Megatron/Ravage - Chris McFeely
Magnus - Michael Ironside
Ratchet - Fred Tatasciore
Cyclonus - Clancy Brown
Tailgate - Josh Gad
Nautica - Missy Peregyrm
Brainstorm - Steve Blum
Swerve - John Mulaney
Chromedome - Keith Ferguson
Rewind - Matthew Mercer
Rung - David Hyde Pearce
Anode and Lug - again I’d cast transgender actresses.
Tarn - Tim Curry

 

Does it matter? Unicron will destroy them all!

 

True

 

Lol, no. Not the LL crew, at least. And based on the OP #25, solit, it seems Optimus will survive.