Yuriofwind and
DYKGaming. For similar reasons, they both provide nice information on video games. I much prefer Yuriofwind though, he's funnier (in fairness, DYKGaming aren't intended to be funny), has more variety in content (Gaming Mysteries ~ discusses beta version of games, changes made through development, cancelled games, some creepypasta's involving games [which is now it's own segment - haven't watched it yet though]; Obscure Gamings ~ Bootleg games, like Sonic Adventure 7; and Reviews), and has much more content in general. There both right up my alley anyway.
I check a few more, that I don't feel like linking (only linked the first two because I already had them open on other tabs) but Ashe and Machinima. Ashe for his covers/songs, and Machinima for Sonic For Hire. Shout out to Roosterteeth & Team Four Star, as both are great but I watch them on their official sites, not youtube.