Gonna drop a few.
Danooct1 - Definitely a youtuber that was bigger a decade ago, but still uploads very sporadically. His whole thing is showing off, explaining, and educating about old Windows and DOS viruses and other malware. Very comfy recording style, pitch black room pointed at a monitor. His videos have basically been the same the entire time, only video and audio quality has improved.
Digging The Greats - Fat Gen X guy that breaks down the details and production of a old hip hop tracks, where the samples came from, and the stories behind them. The recreations and overall smoothness/production quality of the videos are really the strong suit. He knows how to keep things moving quickly while still being informative and entertaining.
Swegle Studios - Young extreme weather/tornado buff, lots of interesting videos about stories of tornados, the types of tornados/clouds, even things like the evolution of tornado footage through the decades. One of those guys that just has a real passion for the subject and wants to make videos about it.
Grand Illusions - One of the only good Brits on this Earth. Geriatric autistic man shows off all sorts of unusual toys and knick knacks. Channel has been going on for over a decade, with just him sat at a table showing off his collection of different themes of toys. Very very kind and sweet old man just talking about his collection.
Running Shine - Only a few videos, but they put other long-form reviews of games to shame. Some of the funniest shit on the internet. Videos by a group of people, very long form-indepth reviews of games. They know their shit, too, especially when it comes to music. They also have streams where they draw or play games. Very good background noise at the most.
Justin Hawkins Rides Again - Lead singer from that one-hit-wonder band The Darkness, they did that song
I Believe In A Thing Called Love. Just him reacting and giving his thoughts on different music, artists, and his history. Nice guy.
Jimothy Ross Like Sseth but even more frantically edited and funny, in my opinion. 20-40 minute videos on games (mostly popular ones) but the editing and voice over collaboration/jokes really rise above most other game review/explanation channels. Epileptics beware.
The History Squad - Another old British dude. Storyteller about a lot of graphic and interesting medieval history. Videos range from gory stories of executions and bow-and-arrow injuries to very informative and entertaining walkthroughs of old castles and manors from centuries ago, and the things hidden inside them, whether it's places for priests to hide, or murder holes hidden above gates to defend the castle against invaders. He's got an eye for the macabe, let that be known.
Protopod/Steve Sutton Middle aged shut-in dude who's been uploading vlogs since 2006 about his life. You might have seen his videos before, has has some absolutely ancient ones about being a Wal-Mart greeter. He likes Star Trek and South Park, and really likes making these weird animations based on them, as well as his own ideas. Some real Rapsittie Street Kids energy, but they aren't terrible. Just stuff he likes making.
You Can't Unhear This - You can probably tell I like the history of modern music production and recording. These videos are analysis's of weird oddities and quirks inside classic Beatles songs that are hard to notice if you're listening to it casually. Weird audio edits and background sounds, cut guitar solo recordings that you can still hear in the room mic recordings of other instruments, making them only appear as ghosts of what the recordings were before. If you like stuff like that, it's a good channel.