#2 Feud with 'The Fiend' Bray Wyatt
Currently on the back off an impressive title defence over Daniel Bryan at the Royal Rumble, 'The Fiend' Bray Wyatt will certainly be in need of a fresh, new challenger and much like all of The Fiend's previous victims (i.e. Finn Balor, Daniel Bryan, and even The Miz), Wyatt has had history with Reigns, as well.
The two men had an intense rivalry back in 2015, which also saw the pair collide inside the brutal Hell in a Cell structure and produce an instant classic. If WWE eventually decides to show little signs of a potential heel turn for Reigns, then a feud between him and Wyatt would certainly be one for the ages, especially with Wyatt now portraying his 'Fiend' persona.
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If WWE does decide on pulling off a feud between Wyatt and Reigns for 'Mania 36, then the WWE Universe could certainly expect some amazing segments between the pair in the lead-up to The Grandest Stage of Them All.
With Reigns having being kept off the title picture for so long, it would certainly be somewhat fair for WWE to put 'The Big Dog' back into the title scene, especially after his recent feud with King Corbin.