9. The Rock
A potential Rock appearance would usually deserve a higher placing on a list like this, but the the People's Champion has perhaps overstayed his welcome slightly. The past few 'Manias have felt over-saturated by the Rock, although his reduced performance last year was a welcome break from his repeated headline match with John Cena in 2012 and 2013 (as well as his poorly-received role as "host" in 2011). With fellow Samoan and cousin Roman Reigns taking part in the headline match, it would arguably be more of a surprise to see Rocky completely absent. Potential Role: Something to do with Reigns, perhaps giving him a pep talk before the big match, maybe even interfering in a minor fashion (to chase off Heyman, or something similar).