Suggestions by @nathanewing

Lockdown (G1)

as Hank Azaria in Voice Actors & Actresses For Characters To Be Voiced

Galvatron (Transformers Prime)

as Frank Welker in Voice Actors & Actresses For Characters To Be Voiced

Scourge (Transformers Prime)

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

Octane (Transformers Prime)

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

Octane (Transformers)

as Dan Castellaneta in Voice Actors & Actresses For Characters To Be Voiced

Mistress of Flame (Transformers)

as Susan Eisenberg in Voice Actors & Actresses For Characters To Be Voiced

Megatronus Prime/The Fallen

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

Apelinq

as Kevin Michael Richardson in Voice Actors & Actresses For Characters To Be Voiced

Lancer (Transformers)

as Cissy Jones in Voice Actors & Actresses For Characters To Be Voiced

Skold (Beast Wars)

as Cissy Jones in Voice Actors & Actresses For Characters To Be Voiced

Solus Prime (Animated)

as Kelly Hu in Voice Actors & Actresses For Characters To Be Voiced

Micronus Prime

as James Arnold Taylor in Voice Actors & Actresses For Characters To Be Voiced

Nexus Prime (Transformers)

as Ron Perlman in Voice Actors & Actresses For Characters To Be Voiced

Liege Maximo (Transformers)

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

Onyx Prime

as Nolan North in Voice Actors & Actresses For Characters To Be Voiced

Prima (Transformers)

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

Sentinel Prime (TFP)

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

Kup (Transformers)

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

Windblade

as Tara Strong in Voice Actors & Actresses For Characters To Be Voiced

Obsidian (Transformers)

as Zeno Robinson in Voice Actors & Actresses For Characters To Be Voiced