WheezyWaiter, Mimei, Tobuscus, Meekakitty, WilsonTech1, CTFxC, SecretAgentBob, vlogbrothers, ViHart, ashens, EmpyreanAria.
Not in any particular order, though I do have a special place for Wheezy. I spend a lot of my spare time watching Youtubers content. I'm subbed to most of their alt channels too. I watch Toby's Gaming channel, but I'm not subbed to avoid spoiler screenshot's that sometimes appear for games I want to play. I love his current Terraria LP, and lament to loss of his macbook when it meant to premature end to Fallout NV LP.
EmpyreanAria makes music and little music videos, most if not all of which is gaming related. "Hello Mister Masters" his his best known song / video with 650,000 views(?), so you might have heard of him, if not, check that out.
Ashen's is like the Yahtzee of tat, except he hasn't abandoned England yet. Very unique, definitely worth looking up if you want 20 minute commentaries of the awful toys you find in poundland (English tat-shop), especially his popstation stuff.
Mimei is one of my favourite lesser known youtubers, and fairly new to it as far as the ones I listed go. She does vlogs in English and Japanese and usually it's just life-vlogging, and commentary, sometimes little reviews of stuff and Q&A's. She's really entertaining, engages with her fans, and manages to inject happiness into the most resolutely crap days.
Oh, I know I'm rambling, but I cannot not mention WilsonTech1. Great guy, hilarious topical videos mostly revolving around tech news, but a lot of general subjects slip in between. He's really come into his own as a youtuber, having a more defined presence, redefined and improved the quality of his videos numerous times, and is definitely worthy as the aforementioned to check out. He'll appeal to anyone who likes in jokes with their youtubers, and someone up for debate and exchanges with their audience.
Anyway, I'll stop now. They're all great. I only mentioned a fraction of what I've subbed to. Wasn't going to mention Meekakitty since she dragged out her vlogs for a few months, and phoned it in with a couple of very short ones, but she's back doing weekly stuff, and it's as good as ever.