#4 Rey Mysterio
As of this writing, Rey Mysterio is still a member of the Lucha Underground roster. However, considering the time of year and the magnitude of WrestleMania, I’m fairly certain something could be worked out if the need were to arise.
Rey Mysterio is the ultimate underdog. His entire career has been a triumphant story of how someone only 5’6” and roughly 170 pounds, has been able to not only compete but dominate at the highest of levels.
Pro wrestling has typically been a sport designed around those monstrous, larger-than-life characters.
However, Mysterio was one of the original small guys who destroyed that very notion, paving the way for an entire generation of performers to not only be accepted but be embraced and absolutely celebrated.
There is no doubt whatsoever that Rey would receive a hero’s welcome if he were to appear at WrestleMania 33.
It’s also worth noting that Mysterio is booked to be in Orlando during WrestleMania 33 weekend. This obviously doesn't automatically mean that he will show up at ‘Mania as there are many former WWE Superstars booked in that area during WrestleMania weekend.