I’m real bad at distinguishing voices, so I’ll probably leave selecting actual voice actors to others when I think about it. I generally don’t know a character’s voice, so much as a vague idea of what their voice might sound like.
This gets especially complicated in TF: Matrix because when Cybertronians are speaking to each other, they don’t use english or any human languages, they use Cybertronian.
So half the time the actual voice actor is going to be buried under, well, this:
And then there’s a lot of different kinds of sounds they make, too, so half the time Starscream’s also like- whistling, or very literally screeching and making like…teakettle noises.
They make a lot of grumbly rumbly sounds and screeching and roars, too. Cybertronians are noisy!