If they are good at what they do ... characters you didn't realize are played by the same actor. Still, many have managed to ...
Read scripts and copy at home, then listen to your recordings and think about how you can improve. You might also consider taking formal voice acting classes or working with an acting coach.
One of the most famous voice actors working today, Hank Azaria, has published an op-ed for The New York Times in which he discusses artificial intelligence, including his fears about the technology ...