Most Helpful Guy
Ok so, from what I understand you don't really have any type of relationship outside of creator/fan so my response entirely hinges on that.
I don't see it being a good idea. If he's a small YouTuber who does it mostly for a hobby maybe. But if he has a few thousand subs you become part of the crowd and as much as someone might be genuine your just a stranger he talked to once or twice and he knows nothing about you despite you knowing so much about him.
Also bare in mind people a lot of people have a character for this sort of thing. Even if you're using your own personality it's an exaggerated one.
Sorry to be a downer but that's what I think.