#1 Kevin Owens

Let's be honest here.
Kevin Owens is the hottest thing in WWE right now and has acted as a huge punch in the arm to SmackDown Live's programming. Not only is that made evident by the boiling hot feud between Owens and Shane McMahon, but also by how much Owens is connecting with the WWE Universe in the process.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
Like many great anti-heroes before him, Owens is acting as a mouthpiece for the WWE Universe and it's yielding some pretty great results so far. Beyond that, Owens's reality-bending promos about the shortcomings of WWE show so much self-awareness on the company's part and willingness to make it better.
With that being said, Kevin Owens is on top of the world right now and while that might not last forever, hopefully, WWE can get some kind of mileage out of it. Maybe it could even result in Owen's first run with the WWE Heavyweight Championship, which would pretty much cement him as the next big thing.