1.Bill Wurtz (his history videos are my favourite YouTube videos)
2.Shaun (previously Shaun and Jen, makes response videos to others)
3.Serpentza (blogger who lives in China)
4.RoninDave (blogger who lives in Japan)
5.SuperMarioLogan (this is going on nostalgia)
Edit: I forgot about AVGN, he would for sure be in the top 5.