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.
I think Adesanya Fans really wanted to see him perform well and surprise the audiences about how he gonna handle this fight. But his problem is Pereira will already know exactly what he gonna do and can predict his movement easily. If Adesanya won't change his fighting style, this upcoming fight will be in favor of Pereira and it might be that the result of this fight is the same as the last one. Pereira can easily dodge and take Adesanya's punches as if it's nothing and that's just how he is always caught by surprise because there wasn't any opponent who can do that against him before. He really needs to win this fight in order to regain back his honor.
But if once again Izzy fails to win, it will be different for him. Some are saying he will have to move to 206 lbs but there are more tough fighters in this weight class.
True that he is fast and stronger. He dominated the fight for at least 4 rounds, he could have won the fight if he just didn't roll back and still have his balance but Periera chased him while his back against the cage. Same Izzy style I think he can win against Pereira, he just has to avoid getting caught by a clean shot because, with just one, he will get more clean shots after it.