I've had a bit of luck finding youtubers/twitch streamers who are content to let some dead air go by if they don't have anything important to say, and definitely don't do any yelling or screaming. It's a real nice change.
Partially I'm just making this post to share the few I've been watching the most:
Jagged Appliance, a Supreme Commander player and caster.
Growling Sidewinder, a DCS pilot who goes into detail about dogfighting and BVR fighter jet tactics.
Tasteless, a Starcraft caster who plays Brood War and chess in the Korean timezone.
Northernlion has thousands of videos and very rarely raises his voice outside of streams. If you just started going through the few thousand Isaac episodes he has at a rate of 4-5 videos a day, you should have enough content to last for years. He is also a pretty witty guy in general so listening to him can be fun. He is a bit of a liberal, but he is much better than the average G*mer in terms of politcs.
Plus the majority of the regular guests on his streams are lefties too
I think he secretly has a leftist bent. If you listen to the NLSS in particular, he seems to use all sorts of language that you could consider to be vaguely leftist coded -- stuff that is associated with various bits from "dirtbag left" and adjacent content like "you love to see it, folks", "large adult sons", shitting on WSB, etc.
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Assuming you mean Esports superstar North Million?