LGR is a great one, he doesn't do lots of games specifically, but does tons of like retro PC hardware/software, some console related stuff, my favorite videos tend to be his "Oddware" videos where he talks about very unusual and little known PC tech stuff. Always very chill.
Stop Skeletons From Fighting would be another great one, I love a lot of the stuff he gets into, he use to be the Happy Video Game Nerd back in the day, but his channel is way better after the change over to what it is now. He tends to do a lot of like...Lesser known consoles, peripherals, full game series such as all the different Doom ports, big variety of retro releases with some new stuff thrown in here and there.
Matt McMuscles is formerly Super Best Friends, with his big video series being the "What Happened?" videos, either talking about games that got released after going through development hell or never got released. He also does a ton of fighting game content, fighting a lot of the funny bad ones, or just talking about series he enjoys, that sorta deal.
Caddicarus is fun if you want kinda more of the "skit" based gaming vids, he tends to do lots of longer form collection type videos, like he's a big Crash Bandicoot fan so he's done videos on Crash, or Spyro, or just other odd ball ideas. His humor isn't for everyone so it's abit random and absurd, but lots of great editing.
The Completionist is always solid, Jirard completes (obviously) games from beginning to end, though he also has a lot of different videos, Top 10's, discussions on games, etc...
I feel like there's a couple more I can throw in, but I'm spacing on them at the moment, but those are probably the regulars I keep up with now.