It's this guy from Canada who goes by the name of Johnny Millenium, who has been on You Tube for quite a while and built up a big following. Unfortunately he removed all his old videos recently, which contained a lot of PC Engine stuff. Nowadays his videos are very generic but his latest one about memorable games in his past, was a return to form, and very entertaining!!
There are load of other good channels which have much more PC Engine stuff up, including mine of course, and Dankss, BossBossly, PhatPhunk, Sp1d1A (is that right - anyway he does amazingly well research and produced reviews - his channel name is Turbo Views) as well as the big hitters from this site - Sunteam and PCEngineFX !!!
Most of the you tube gamers who have lots of subs have some sort of PC Engine collection: Splatter Trigger, Luke Morse 1, Gamester 81...