I like the idea of MrBitcoin to be near and close to the name of the known content creator who gives free money. With the idea of giving free bitcoins well the guy should be someone who's really wealthy and considered as a whale to the point that the bitcoins he's giving won't affect his total holdings.
As per the OP said, it will not affect his total holdings because he'll have sponsors and will promote any known campaign. The challenge for MrBitcoin should be entertaining and most of the community supports his way and approach when it comes to BTC.
It is impossible for someone to be MrBitcoin if he only has the bitcoin for giveaways, sense of humor and being an intellectual must include as one of the requirements.
here's what @Kakmakr stated regarding bitcoin for giveaways;
Well, MrBitcoin will be getting more bitcoins out of this, than what he would be giving away. Remember Bitcoin companies could sponsor some of these videos for advertisement.. Also, when Mr. Beast visit a Bitcoin merchant, that merchant would get FREE advertising.
Imagine Overstock sponsoring a good video and getting millions of views? I bet you, if this takes off, other Bitcoin companies would also start to sponsor some videos.
Now that I knew the factors to be MrBitcoin, I think it's really hard, it's someone that is very extraordinary and very responsible.