4. Kane
Could Kane face his (kayfabe) brother The Undertaker at WrestleMania 32 inside of the infamous Hell in a Cell?
This would mark the 3rd time Kane faces him at WrestleMania and most likely would also be the 3rd time Taker beats him at Mania.
Actually an odd scenario as Shane & Kane have a history, battling each other in 2003 after Kane lost his mask, but with WWE creative you never know.