#4. John Cena
John Cena is one of the greatest of all time and is perhaps the most well-respected part-timer in WWE today. He's certainly earned his reduced WWE schedule, but he's made it no secret that he'll stick around until the day WWE tells him that he isn't needed anymore.
Luckily for us, Cena is still in great physical shape and when he returns, it feels like he never left. In every appearance that he's made since becoming a part-time Superstar, he's shown that he's always one step ahead of everyone and has been one of the most selfless top stars in WWE history, putting over a plethora of Superstars in the last few years.
The truth is that John Cena isn't needed as frequently anymore and his rare appearances make any program he's in even more special. Perhaps he would benefit from spending a year in Hollywood and coming back around WrestleMania 37 season, especially since he was seemingly written off at WrestleMania 36 in the Firefly Fun House match.