I try to limit YT because obviously it's cancer but indeed I do have a few guilty pleasure channels I watch sometimes (now mostly via freetube). Here are a few (maybe I'll edit some more in later):
Fascinating History: very cool lad with good sense of humor documenting curious historical events in a calm voice. No sponsor messages or similar crap.
Fascinating Horror: the same guy, here doing short (~10 min) videos on various tragedies in a neutral tone, no drama or opinions, just facts.
Qxir: Irish guy narrating and illustrating interesting and often morbid stories in a fun way. I can see him being annoying to someone viewers as he's got this more pronounced style and character, so it's a matter of taste. I personally like his videos.
Gus Johnson: Very funny guy doing sketches with his family and friends, usually making fun of the stereotypical US south rednecks and stuff like that. He also does chill streams where he opens up Pokemon cards and things like that.
Practical Engineering: Cool engineer guy, I believe from Texas. He looks absolutely like the typical engineer and has a quite nice voice, does a lot of shorter (~10 min) videos on cool engineering concepts as well as longer (~20 min) minidocumentaries, especially on dam failures but also on blackouts etc. He has this cool series called "what's that infrastructure" where he examines photos of weird things in cities, I enjoyed this one a lot. Sadly has sponsors (use sponsorblock).
Smarter Every Day 2: Smarter Every Day is fairly well known -- this is his second channel where he dumps uncut videos of him touring factories and speaking to the CEOs and engineers and scientists. There are hours and hours of great talk about newest technology and various practical engineering things and stuff, ideal as background videos for when you're drawing something for example.
Magnus Midtbø: Quite popular channel that nowadays suffers from clickbait and shitty content, but there's still good stuff and you can just go for his older videos. He's a Norwegian, one of the best world climbers, doing various strength tests, meeting and training with other climbers, bodybuilders, soldiers and stuff like that. I'm not a climber or anything like that, but I find it fascinating to learn what that world is about.
Some other channels I liked to some degree are Fredrik Knudsen, Internet Historian, Outdoor Boys, Numberphile, CGP Grey, Grubby, 3Blue1Brown, Quake Speedruns Explained, Curious Cabinet, DYKG Clips, Annoying Warcraft 3, Primitive Technology, Smarter Every Day, People Are Deep and probably many more.
Bonus Section
Ashley Jones. She took down her comedy videos from her PeerTube but you can find them around. They're among the funniest shit I've seen. For example:
Next:
doog.
Also
this guy on Vidlii.