5. MVP
Leaving WWE in 2010 to pursue a career in Japan, MVP was one of those who should have been WWE Champion but never was. Initially debuting with a lot of hype, MVP somehow never moved further up the ranks and that is something that desperately needs to be rectified. He turned face in 2009, but unfortunately that run left a lot to be desired. His cocky mannerisms and promo style were neutered, similar to how The Mizs face run is progressing at the moment. His character felt lifeless. I believe that this was the reason why he could never move up to main event level. His return would have to be as a heel, most definitely. Its been so long now that an MVP return would be accompanied with a lot of fanfare, so it would be best to take advantage of that. With hype similar to how Rob Van Dams return is being promoted at the moment, MVP could return and slot straight into the World Heavyweight Championship scene. Bring back everything that was good about his character and WWE have real potential on their hands. His time in Japan can have only been a positive experience for him too, improving his in-ring technique and overall experience.