#1 Roman Reigns
As time goes on, more and more boos are starting to fill the arena when former WWE Universal Champion Roman Reigns hits the ring. Of course, some always expected that the polarizing nature of Reigns' character would return at some point following him announcing that he'd once again won a battle against his leukemia.
Prior to him leaving WWE due to the illness, many believed that the company should turn him heel, as his run as Vince McMahon's top guy hadn't been going according to plan for quite some time at that point.
But now that he's returned, and now that the negative reactions are starting to filter back in, it could be the perfect time to shock the WWE universe by turning the ex-Shield member heel, perhaps alongside The Usos, as the three members of the Samoan wrestling dynasty would undoubtedly make a fantastic heel trio.