Suggestions by @zexalwhatifs

Steve Blum

as Swindle in Transformers: Fall of Cybertron

Steve Blackman

as Swindle in Transformers: Fall of Cybertron

Travis Willingham

as Onslaught in Transformers: Fall of Cybertron

Liam O'Brien

as Air Raid in Transformers: Fall of Cybertron

Travis Willingham

as Sideswipe in Transformers: Fall of Cybertron

Pauline Newstone

as Airazor in Beast Wars (with more characters)

Chris Hemsworth

as Optimus Prime in Transformers: Cybertron (Hasbro Entertainment Re-Dub)

Sean Schemmel

as Future Autobots and Decepticons in Transformers: Legion Of Protectors

Ward Perry

as Future Autobots and Decepticons in Transformers: Legion Of Protectors

Scott McNeil

as Future Autobots and Decepticons in Transformers: Legion Of Protectors

Mark Acheson

as Unicron in Transformers: Legion Of Protectors

Alyson Leigh Rosenfeld

as Slipstream in Transformers: Legion Of Protectors

Scott McNeil

as Hound in Transformers: Legion Of Protectors