#3 The Young Bucks

It's hard not to look at The Young Bucks and think that they are living legends. These guys have been in every wrestling promotion all across the world. They have been mainstays in AEW (obviously), TNA, NJPW, and ROH.
Their time in TNA was not to their liking. They were known as Generation Me and feuded with the likes of The Motor City Machine Guns. They explained in an interview that they signed a contract without reading it and were paid per appearance. Moreover, their booking didn't make any sense and competed as single wrestlers for a short time. Thankfully, they moved on from that.
Here's another shocker for you. The Young Bucks were in WWE, as Shawn Michaels and Triple H, in a parody of D-Generation X, back in 2008. Interestingly enough, they were there on the behest of John Morrison and The Miz for their show, The Dirt Sheet. How things have changed in a decade.