Pereira is not a very likable character since he doesn't smile a lot but I can say he put all his strength to be great in this sport. He is from a very poor beginning though, same as those who started from scratch. I would be happy for him to become successful too.
That is not important at all, Mike Tyson was not a likeable character, he didn't smile much and he dominated boxing for years.
My prediction is that Pereira probably winning on points, unless Adesanya make huge surprise with his fighting style and dominates more with wrestling.
I think both of them are good in stand up, Adesanya is faster, Pereira is stronger, but all other skills outside kickboxing is advantage for Adesanya.
Dana White and the UFC went thru the hoops to get and support McGregor in his foray into boxing. But the thing is if the UFC fighter lost in a boxing match it diminishes the UFC fighter's stock and in a way it also diminishes the UFC as a brand. So after McGregor vs Mayweather, the UFC isn't having more boxing matches involving fighters from their roster.
I don't think it affects UFC at all, but they can't control money and take most of the earnings like they are doing in their competition.
Let me predict that is McGregor makes another boxing fight UFC will allow him to do it, but other fighters wont be allowed to do that.