So this thread is interesting to me since I waste way too much time on youtube. But wasting so much time on youtube means that there are a lot of youtubers to list. I won't do links.
Also, this is just a fraction. I will update this list the more I remember.
**** this one too
GameGrumps (Jontron (now gone from the show), Egofaptor, Ross O'Donovan/RubberNinja, Danny Sexbag, main member of Ninja Sex Party)
Ninja Sex Party (Hilarious music)
Jontron (Video game and movie reviews. Pretty funny, previously on GameGrumps)
Egoraptor (Do you even internet?)
DigitalRevTV (Entertaining photography videos. Kind of like top gear)
Taofladermaus (GUNS)
Mattv2099 (****ING HILARIOUS GUN STUFF)
FPSRUSSIA (GUNS)
Quirkology (Mind ****ed deluxe)
Vsauce 1-3
Photonicinduction
RoosterTeeth (Now is mostly Geoff Ramsay's result of scamming the company into letting him play games for a living)
Cinemassacre (AVGN)
Yahtzee (Look him up)
Jim Sterling (Still hasn't done an episode in Spanish)
i just remembered what i put here in my nightmares
Spoiler Warning Show (Clever comedy gaming videos)
ZeFrank (I feel human)
Rocketjump (AKA Freddiew)
CorridorDigital (Freddiew's friends)
NerdCubed (Funny English gamer)
Emma Blackery (Funny English girl vlogger)
TheSw1tcher (Two best friends. And some other friends, but they're not on the machinima show)
nope this one too
GoldenTot (Silly gaming)
Rob Dyke (Mainly "Why Would You Put That On The Internet", where he makes fun of ridiculous twitter, facebook posts, Craigslist ads or other things)
Cinemasins (Everything wrong with movies. Nitpicking included. Not 100% serious, calm your tits.)
EVERYTHINGISTERRIBLE (Old, terrible videos from 90's and 80's)
Djy1991 (ICTON main videos)
WergBurg (ICTON Faffing about videos. Djy1991's more personal account)
LaytonTaylorJunior (Not famous at all, but produces high quality, funny and slightly dark comedy-ish rant videos. Been gone for a long time, but he just updated his youtube)
TheAuzzieGamer (Second gaming channel I watched)
Yogscast/Bluexephos
MrCreepyPasta (**** yourself)
theLittlefears (**** yourself again)
Ross Scott (I don't remember his channel name, but Freeman's Mind is pure comedy gold in-character commentary in HL1:S. Ross' Game Dungeon is also a very good criticism show)
HelixSnake
SeaNanners (And most of the youtubers associated with him)
TheSyndicateProject (Mixed feelings)
ADoseofBuckley (Cynical, very serious, no bull**** rant videos.)
Ashens (Basically Not-Yahtzee-Yahtzee reviewing poundland junk)
Eddsworld (Cartoons. RIP Edd Gould)
TomSka (Skits)
Carsandwater (Drops a red hot nickel ball on things, ****ing good)
AWE Me (MAN AT ARMS MOTHER****ER)
Criken (Gaming video stuff)
Chkmie (what the ****... I like it)
ExtraCreditz (Very good videos talking about game stuff)
Aplfisher (good gamer)
STAR_ (Good gamer again)
Ampisound (Freerunning made not stupid)
BigThink (Smart people talking. I mean big time smart people)
BINKBeats (Everything recorded live at the spot by one man. He's good)
penguinz0/cr1tikal (Just watch)
meh
MarbleHornets (Even though Slenderman isn't real good luck not freaking the **** out)
Brick Stone (Is Brick Stone)
Dan Bull (Video game based raps)
n o p e
Brusspup (Mind **** again)
CGP Grey (IT'S GOOD WATCH IT)
Cyriak (Holy ****)
DasBoSchitt (Don't know what to say. Gmod videos, game reviews, tutorials, mixed bag, basically.)
David Firth (Do you have any rusty spoons?)
DEElekgolo (Making fun of ****)
David Lewandowski (Going to the store)
DefendTheHouse (Game mythbusters)
DemolitionRanch (GUNS)
DruoxTheShredder (Gaming stuff)
The creatures (Not one channel but look them up)
dsSLAY3R (Funny TF2 stuff)
Epic Rap Battles (Can be funny)
Evmoneytv (Rants)
ExplosmEntertainment (This **** is dark)
PressHearToContinue (dodger dodger dodger dodger)
RhettAndLink (Good videos to start your morning)
Guy Collins (Oh man you're missing out)
Jacksfilms (Skits and making fun of bad grammar)
OOOHKHKHK I AM GOING TO STOP THERE. THERE'S WAY TOO MUCH MORE TO ADD BUT I CAN'T BE ARSED