#6 Seth Rollins

Seth Rollins heel turn in 2014 was groundbreaking. He won the United States Championship and WWE Championship together, making him the first superstar to do so. He achieved a lot during his epic heel run, but then he suffered an injury and his career changed. He overcame his injury in quick speed and his return was glorious. The crowd in the arena went insane regardless of whether he was a heel or not. His return feud with Triple H quickly turned him into a babyface.
Since then, he has lost his edge; he is an amazing wrestler and there is no denying that, but the heel character definitely suited him better. The Shield reunion has helped his character a little, but everyone knows it is not going to last long, and he needs to turn heel to keep up the momentum. His turn can be against Reigns at Wrestlemania 34, which could be very unexpected. He is more comfortable as a heel, and his potential feud with Reigns will be very welcomed by the fans.