"Who's your favorite YouTuber?"

Do not have one, but I suppose...

AzzMan

Is pretty entertaining. He is not annoying and childish like that Mark Caterpillar man... Hardly even a man at that...

A Swede, he is... Interesting to watch?

PewDiePie

He refers to himself as...?

But I would have to go with AzzMan. I find him funny and showing a friendly side, most of the time.