Anime:
Besides also watching Geoff (Mother's Basement) and Tristan/Arkada (Glass Reflection) I also follow
AniNews https://www.youtube.com/channel/UCchUOUW-eNmDfDqMS_AiZew (mostly for Overlord and Shield Hero content)
CDawgVA https://www.youtube.com/channel/UCPsZ_0SkFdi551iYTG04R2g (mostly for his stupid antics, he's mostly just a JVlogger now)
Gaming News/Videos:
JackFrags https://www.youtube.com/user/jackfrags
Matimi0 https://www.youtube.com/user/Matimi0 (occasionally, I watch his stream more then his youtube channel)
LevelCap https://www.youtube.com/user/LevelCapGaming (don't watch him as much as I used to since he became more news centric)
TheRussianBadger https://www.youtube.com/user/TheRussianBadger
The Escapist https://www.youtube.com/user/TheEscapistMagazine (mostly for Zero Punctuation)
Also follow YongYea as well
FFXIV Related:
MrHappy1227 https://www.youtube.com/user/Xehanort1227 (mostly for guides and news)
Ethys Asher https://www.youtube.com/channel/UCs2UQ_EJkAAlzXkcTfDj-2g (FFXIV Lore Daddy, follow for all that juicy FFXIV lore)
MTQCapture https://www.youtube.com/user/MTQcapture (guides)
Final Fantasy XIV https://www.youtube.com/user/FINALFANTASYXIV
News:
Internet Today https://www.youtube.com/channel/UCyZVCV9xhrCyz4hPehvb4Wg
Philip DeFranco https://www.youtube.com/user/sxephil
Building Stupid Shit (not sure how to classify these):
michaelcthulu https://www.youtube.com/user/michaelcthulhu (builds ridiculously huge weapons, rather entertaining)
Hacksmith Industries https://www.youtube.com/user/MstrJames (the makers for that lightsaber vid I posted)
Music Oriented:
Chillhop Music https://www.youtube.com/user/Chillhopdotcom (I've really gotten into lofi lately)
Vincent Moretto https://www.youtube.com/user/HaarasNC (man does some killer metal covers of Ace Combat music as well as others)
Frog Leap Studios https://www.youtube.com/user/leolego (does some killer covers)
As well as multiple other ones mostly centered around piano covers of anime openings and endings (I'll provide links if anyone is interested).
Science/History:
Biographics https://www.youtube.com/channel/UClnDI2sdehVm1zm_LmUHsjQ
SciShow https://www.youtube.com/user/scishow
Forgotten Weapons https://www.youtube.com/user/ForgottenWeapons
VLog Oriented:
Abroad in Japan https://www.youtube.com/user/cmbroad44 (just because I find Japan interesting and I like Chris's personality)
Random Nerd Shit:
FilmComicsExplained https://www.youtube.com/channel/UCisWUR5UCMcxz_4zT6mI3kA
Certifiably Ingame https://www.youtube.com/channel/UCJutYkYphYcGo-xbqyQJeYA (mostly for his Star Trek and Star Wars lore video's)
EckhartsLadder https://www.youtube.com/channel/UCp6F1mQGuaXiDj5otWBmIjg (mostly for Star Wars content)
40K Theories https://www.youtube.com/user/remleiz (even though I don't play Warhammer I find the lore fascinating)
Streamer Related:
Streamers Reloaded https://www.youtube.com/channel/UCDT1meaKQ_D1HjhTGULNbew (I spend way to much time watching streamers and for some reason streamer drama just amazes me hence why I watch it)
I also watch a lot of other youtubers this is just a small snippet of what I watch (plus some of the others I really don't know how to classify into a category as they cover more then just one thing). Not to mention the recent rabbit hole I fell down and wish I never did (I've gotten into vtubers and I don't know whether to be disgusted in myself or just resign myself to this weird fad).