Northernlion is my favorite YouTuber overall. I enjoy watching him play games with his friend group or just solo. His podcast style livestreams are amazing too.
David Dobrik puts out some really funny vlogs. His entire friend group is pretty funny and once you get to know them all, each video is like watching a story unfold. Everyone has their own storyline that you can kinda follow if you watch a lot.
Pikasprey - makes really good gaming content, mostly summaries of interesting games, but he also likes to challenge the norms of older ones (ex. beating old Pokemon games with only Ditto)
Cody Ko - really funny. best described as commentary/react type of videos poking fun at people that just don't make that great of content.
Acai - guitar hero streamer. very talented. very funny.
kiwami japan - he makes knives and other sharp things out of unorthodox materials, very entertaining. although silent, he's still able to maintain a "lore" through his videos that makes watching every new one worth it.
VoidTracks - if for some reason you're into very underground/kinda sloppily mixed/usually pretty aggressive rap, this is the channel for you. it's introduced me to a lot of new songs/artists that i would've never known about otherwise.