#4 Mr. Kennedy
Mr. Kennedy was a big name in WWE back in the mid-2000s. He feuded with top WWE Superstars on the SmackDown brand, most notably The Undertaker and Batista. Kennedy went on to win the Money In The Bank briefcase at WrestleMania 23 but lost it to Edge soon after on an episode of RAW.
Kennedy didn't do much of note for the remainder of his WWE career. He was released by WWE in 2009. Kennedy later stated that Randy Orton had a lot to do with WWE releasing him.
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Having won the US title on one occasion during his WWE stint, Mr. Kennedy did much more upon his release. After a short run on the independent scene, Kennedy made his way to Impact Wrestling.
For the next six years, Kennedy remained a mainstay in Impact Wrestling and was featured in some of the biggest storylines during his run. Going by the moniker of Mr. Anderson, he won the Impact World title on two separate occasions. He was fired in 2016 after failing a drug test.