Ace Austin

The easiest comparison I can make for Ace Austin is if you blended Rich Swann and Finn Balor. He's primarily an athletic high-flyer, but some of the moves he pulls out are akin to those performed by Swann, Ricochet and Will Ospreay. While he still has a ways to go and is still working to be on the levels of Ricochet and Ospreay, he's still one of the best middleweight/cruiserweight workers in the world.
He also has a built-in gimmick with playing cards as his name is obviously Ace and he is routinely seen with a deck of cards. He also sports a tattoo of some cards on one of his upper arms.
One wrong move ruined his entire WWE career - Watch Now!
Austin's matches in MLW with Swann, Teddy Hart and DJZ were phenomenal and should at least give those not familiar with his work a taste of the type of style he brings to the ring.
Should WWE give him a chance, and they'd be crazy not to, the matches he could put on with the likes of Andrade, Ali, Balor and Richochet would certainly wow the crowds.
A top WWE star is missing in action