#7 Bo Dallas, signed in 2008
Bo Dallas has probably been in WWE longer than you'd expect, mainly because you probably forget he exists from time to time. Prior to his recent admittance into the Miztourage, Dallas was doing absolutely nothing. He had a strange run where he was defeating jobbers for weeks and carrying around a political sign, but then again that may have just been a fever dream.
Despite his general lack of involvement, Dallas has been in WWE for quite a while. Although it may seem like a lifetime ago, Dallas was NXT Champion in 2013. But he was actually with the company well before this as he signed all the way back in 2008 and reported to FCW shortly after, where he would remain until their rebrand to NXT in 2012.
Dallas, like Alicia Fox, is another example of someone who is usually so underutilised, it's amazing he's stuck around in WWE for this long. Before joining the Miztourage, Dallas was rarely seen on WWE TV at all, not even as a jobber. That makes you wonder what exactly his value is to WWE if they're not even using him to lose, a la Curt Hawkins.
And speaking of Curt Hawkins...