#2 The Undertaker

The Undertaker will be in yet another match at WrestleMania, this time facing former WWE Champion AJ Styles at WrestleMania 36. The Phenomenal One has called out The Phenom and even his wife Michelle McCool, while also breaking kayfabe and using Undertaker's real name, Mark Calaway.
This brought out a different side of The Undertaker on last week's RAW, where he had a character similar to The American Badass gimmick that he used almost two decades ago. Reports have suggested that we could see a different Undertaker at WrestleMania 36, which could perhaps be an indication that his Deadman character is coming to an end.
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Vince McMahon is reportedly a big fan of AJ Styles, as per this report, and Styles could be the one to finally retire The Undertaker, at this year's WrestleMania. WWE may want to shock fans at The Show of Shows, which will not have the glamour and scale of past shows, but they could compensate with a huge story like The Undertaker retiring.
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