#4 The underdog - Johnny Gargano
Johnny Gargano is one of the most talented in-ring performers in the world, and dream matches against Neville, Ricochet, Alexander, Balor and Rollins and now Daniel Bryan are all possible in the future.
However, it is unclear whether he will be sticking around NXT for long after his Takeover feud with Ciampa ends, so giving him the platform to burst onto the main roster scene with a plucky underdog win would leave fans overjoyed and provide a real WrestleMania moment.
The past performances in Royal Rumble's of Sami Zayn and Finn Balor show a smaller superstar can still hang with the big guys, and with Gargano's connection to the audience already secured, a Daniel Bryan type run at the top of the card could very well be what the WWE Universe is looking for.