For me it's DJ Peach Cobbler. I've been watching his videos since he had around 2,000 subscribers. Now it's nearly 450,000.
He used to mostly make videos on games, now he does a lot of history stuff too. He also has a little satirical news show, and a few tasteful shitposts. A really diverse YouTube channel.
What's your favorite YouTube channel that's not a mainstream big-name like pewdiepie, mrbeast, ksi, etc...?
Blind Drunk. I know for a near fact that nobody's heard of them because they have like 2K subs, but they're good as hell. They make a drinking game out of reading trash right wing books by people like Boris Johnson, Ben Shapiro, and the dork who wrote the Turner Diaries. But despite how messy and dark things could get with that premise, it's some of the funniest, best put together and most insightful content I've ever seen on the subject of fascism and fascist psychology.
Love me some Peach Cobbler too.