Diaz Bros and Anderson Silva.
For the Diaz Bros they need opponents who will stand and bang almost exclusively to be exciting. Their opponent goes for a takedown and they just fight lazy off their backs and complain about the decisions. Their opponent fights measured on the feet and doesn't get drawn into a brawl they either get blown out a la Thompson or have a boring ass fight where they can't close the distance with footwork a la Conor/Nate 2, GSP/Nick, and many others.
Anderson has some great finishes but also some of the most boring fights there are. Anderson/Leites, Anderson/Maia, Anderson/Bisping, Anderson/Diaz, and that's just in the UFC. It's like at times he just loses all killer instinct whatsoever and is content to ride out a decision, even one he is not winning like Bisping.