I really disliked Varner a lot at one point but somehow he turned it around in my eyes.
Bisping I hated because I always felt he was overrated and was being pitched softball match ups when he was streaking while being arrogant about his abilities. I feel like he's taken his losses well, though, and he does usually have interesting things to say and is undoubtedly a solid fighter. I feel bad for his eye deal too and he's told a few stories about how he started out in the sport with nothing to his name, sleeping in his car in the cold to fight the next day. Pretty bad assed. So, he's sort of grown on me, although i wouldn't really call myself a fan by any stretch.
I hated Anderson and feel less of that now that he got KO'd then TKO'd back to back. He has also gone a long way towards living down some of his antics in the cage like in the Maia fight which was almost unforgiveable to me at the time. I was on board with saying he was best P4P and all but felt like a lot of what he did was overrated in some ways. Some of his competition wasn't what I would have liked. But like I said, he was still clearly one of the very best ever.
I initially disliked Bones to some extent. I thought he was getting too much hype after his first couple fights, but I think it was Hammill fight where I was like, "Damn, he is a huge prospect" and the Vera fight where I became a fan, and said, "No, this kid is definitely for real. Probably a future champ." Despite all the haters, I like Jones a lot now. lol
For the reverse...
I liked Nick Diaz when I first saw him fight in his first UFC run but I've hated him and his brother for a long time now. I can't abide by their stupidity and attitude. It's fine to hate doing publicity and not want to be there but they really get under my skin with the shit they pull and how they act inside and out of the cage. I can't wait for the sport to evolve to the point that guys that immature can't even be competitive anymore.
I used to love Rousey prior to her coaching TUF (and I was basically neutral between her and Miesha for their first fight because I liked Miesha too) but now I almost despise her. She still has the qualities I respected about her from before, but I've seen too much of the rest of her personality to ever root for her.