Does your character wear anything that would obstruct their face or mouth? Yes, his Arbiter helmet. Also, his mouth is shaped like a squid's so good luck with that lololol.
Do they speak in a manner that might be difficult to understand? He's an alien. He doesn't speak your dirty primitive languages.
Do you want to opt out of any of the above text quirks? Yes, don't make me type like this.
Anything else you wanna add? You're missing out on the smooth tones of Keith David, sucker.