#3 Bobby Roode (heel turn)

Another wrestler who had proven himself on NXT, and was brought to the main roster amid huge fanfare.
The "Glorious" superstar was able to make an immediate mark on SmackDown when he went on to with the US Championship. He subsequently lost the title to Randy Orton, but the downfall for Bobby Roode started when he was drafted to Raw, and all of a sudden the WWE management ran out of ideas with what to do with him.
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Ever since then, Bobby has been put in a tag team with Chad Gable, which wins a match one week and loses one the other. Bobby actually made his name as a heel during his career, and in a character that is to an extent getting stagnant, it would be a welcome change if Bobby is actually turned heel, and things start to kick-off for a change.