#3 Finn Balor

Maybe this isn't everyone's ideal choice for Ronda Rousey's WrestleMania partner, but its hard to deny that it wouldn't be a bit of an interesting pairing if WWE wanted to go in this direction. Furthermore, it would be a great way to elevate Balor a little bit by putting him up against his mentor in NXT, Triple H.
Again, maybe this choice is just coming from bitterness after watching Balor lose in his Elimination Chamber qualifying match to John Cena, but its also hard to argue that this wouldn't be a good thing for both Balor and Rousey. It could even be one of the marquee matches for WrestleMania 34 if WWE is able to put a believable story behind it.
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In fact, next to superstars like John Cena, and The Rock, Finn Balor is one of the most appealing superstars to young audiences, which means the company would be able to use Balor to captivate the younger audiences and make them fans for life. WWE could even do Demon Mode, Finn Balor to appeal to older fans as well!