Suggestions by @bumbleprime

Ironhide (Transformers)

as Idris Elba in Which characters would you like to see actors play in live-action

Score: +9

Elita-1 (Transformers)

as Jodi Benson in Voice Actors & Actresses For Characters To Be Voiced

Score: +4

Optimus Prime

as Peter Cullen in Voice Actors & Actresses For Characters To Be Voiced

Score: +8

Justin Long

as Mirage in Scooby-Doo! Meets The Transformers (The Need For Speed)

Score: +1

Jazz (Transformers)

as Wayne Brady in Voice Actors & Actresses For Characters To Be Voiced

Score: +4

Jack Skellington

as Jim Carrey in Which characters would you like to see actors play in live-action

Score: +3

Ironhide (Transformers)

as Dave Bautista in Which characters would you like to see actors play in live-action

Score: +4

Bumblebee (G1)

as Scott Menville in Voice Actors & Actresses For Characters To Be Voiced

Score: +4

Bumblebee (G1)

as Yuri Lowenthal in Voice Actors & Actresses For Characters To Be Voiced

Score: +3

Chromia (transformers)

as Grey DeLisle in Voice Actors & Actresses For Characters To Be Voiced

Score: +1

Ironhide (Transformers)

as Clancy Brown in Voice Actors & Actresses For Characters To Be Voiced

Score: +6

Bumblebee (G1)

as Jason Marsden in Voice Actors & Actresses For Characters To Be Voiced

Score: +5

Ratchet

as Corey Burton in Voice Actors & Actresses For Characters To Be Voiced

Score: +6

Jazz (Transformers)

as Khary Payton in Voice Actors & Actresses For Characters To Be Voiced

Score: +6

Wheeljack (Transformers)

as Steve Blum in Voice Actors & Actresses For Characters To Be Voiced

Score: +9

Thundercracker

as Jim Cummings in Voice Actors & Actresses For Characters To Be Voiced

Score: +4

Starscream

as Mark Hamill in Voice Actors & Actresses For Characters To Be Voiced

Score: +6

Shockwave

as Keith David in Voice Actors & Actresses For Characters To Be Voiced

Score: +7

Unicron

as Tony Todd in Voice Actors & Actresses For Characters To Be Voiced

Score: +6

Cliffjumper (Transformers)

as Matthew Lillard in Voice Actors & Actresses For Characters To Be Voiced

Score: +6