I quite like that he is angry at the rebels at the beginning and menacing to the Imperials. He sees the Rebels as traitors (and like the person he is trying not to be). I would have made him a bit more shouty at times in the other films but he doesn’t interact with Rebels directly in the other films. He is certainly less talkative in Rogue One. He does yell at his underlings during the Obi-Wan series. It is a great effect though. Is there another way I can get a donation to you? I’ve given up on PayPal. It will not cooperate.