#2 Current WWE NXT North American Champion Johnny Gargano
Former WWE Champion Triple H has a habit of putting over former NXT talent at WrestleMania. In recent years, he has faced the likes of Seth Rollins and Roman Reigns, two men who he once welcomed into NXT.
At present, there are several prospects down in WWE developmental who could realistically be called up from NXT to challenge the former 14-time World Champion.
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Triple H is more commonly seen as a heel on WWE TV, and if he was to return as a heel this time around then, he could step up to someone like Tomasso Ciampa.
Despite this, Johnny Gargano appears to be the big star emerging from NXT at present. If he were the man to retire Triple H at WrestleMania, that would definitely put the former NXT Champion on the main roster map.
Gargano has already been promoted once and was then sent back down to NXT. This time around, WWE needs to ensure that his stay on the main roster is made much more permanent.