Considering how ass modern UFC is, they could use some tips from Pro-Wrestling. The sportification of MMA makes it so boring. No one wants to see Dagestani grappler #42 vs Mohammed-Ishmale-Habib regardless of if they are "the best in the world" at scoring points on the ground and going to decision. Skill is an important aspect of MMA, but if you are going to put that shit on TV for people to watch, how entertaining it is takes precedent.
Rampage, Tito, Lidel, Couture, Wanderli, Sakuraba, etc, all had unique looks, personalities, and styles. It's not a coincidence that the golden age of MMA was the time period when the scene was filled with colorful, larger than life fighters. PRIDE FC was the greatest MMA promotion of all time, because it was created by a Pro-Wrestler who mixed MMA action with Pro-Wrestling presentation.
But hardcore MMA fans are legit the dumbest fanbase on earth who think "if you want entertainment go watch WWE" is an epic own, and are convinced that the actual problem is the UFC is too much like WWE despite how little sense that makes.