#4 The Undertaker
Let's be honest here.
There's one reason why WWE keeps bringing back The Undertaker and that has to do with his larger than life presence. From the moment the light goes out and the gong sounds, you know that fear has crept into the mind of the opponents.
And that's why the WWE needs The Undertaker. He is arguably one of the few trump cards that the company has left and is usually responsible for some very memorable moments. Of course, that isn't always the case and he has been known to have a bad match here and there, but just seeing him is enough to make any event must-see.
The Undertaker is a bit of a unicorn in today's WWE. Not always relied on anymore, but when they need a legend to trot out for a special appearance, he is usually the one they call. Here's hoping they continue to do and are able to create a few more memorable moments before he retires.