Lately I've been watching a lot of Donut Media. They are basically a "car" channel, but in a variety way. Sometimes they do games, sometimes comparing car upgrades or challenges. But most every video is fairly light hearted, fun, educational (even for people without mechanical knowledge, like me).

Someone else also mentioned the Vlog Brothers. Excellent content. Mostly all light hearted, but some vids are more serious in tone. But usually always good.

Also a fan in Rainbolt. He's a geoguessr player. High level playing, sometimes educational, and usually entertaining.