Thought this might be fun - Just think of a WWE character / persona that would fit into a role in any other media, be it film, TV or books. I'll kick off.
1: "Deadman" Undertaker - Defence against the Dark Arts teacher at Hogwarts.
(I'm going with his babyface alignment here) But if you're trying to arm and defend the young of the wizarding world from the darkest of magic - who better than a supernatural being who can top anything that even "He-Who-Must-Not-Be-Named" could even dream of? Plus if it came down to it, he could always simply drop "You Know Who" on his head with a Tombstone. I think you could also pretty much guarantee that lessons would be interesting, and mischief among the kids nonexistent as the mere glare in their direction from The Reaper of Wayward Souls would freeze them to the spot. 10 points from Gryffindor? No, how about I don't send you backwards through that desk.
2: "American Badass" Undertaker - Ghost Rider.
The Devil's personal Bounty Hunter? A seven foot tall monster with a penchant for motorcycles who is already more than on nodding terms with Beelzebub himself? Round peg, round hole.
3: "The Game" Triple H as Eddiard Stark, Game of Thrones.
A tough as teak, leader of men - and a legendary warrior on the battlefield as well as a silver tongued wise counsel. The only thing missing is the Yorkshire accent. "Winter is coming, Are you ready? No, I said Are, you RRRRREEAAAADDDDYYYY. Then for the North, the Andals and the First men, LLLLLetsss get ready to snufff itttttt!!!!