5. Kevin Steen
This one is probably the most unlikely on the list, if only for his physique. That might seem superficial but seeing as WWE are being so hard on Kassius Ohno for his shape, it seems a fair assumption that Kevin Steen would never even be given a look in WWE. That being said I would love to see the Canadian in WWE, if only to square off against CM Punk, Daniel Bryan, Antonio Cesaro or to continue his epic feud with Sami Zayn. Each of those match-ups would provide fantastic encounters. Kevin Steen has been in Ring of Honor for many years now and has been in the main event picture for the majority of that time. That's a testament to his abilities and his ability to draw. Steen can be an edgy character and the anti-establishment kind-of-guy, which makes him a great heel and face, which is also why I think he would have such great chemistry and thus great matches with Punk.