#4. Sheamus - Turned heel and debuted a new look in his WWE return in 2015
By 2014, Sheamus felt like just another superstar on the WWE roster. He hadn't done too much, and it seemed like his World Championship days were well behind him.
Returning from an injury in 2015, Sheamus decided to change things up. Alongside a heel turn, Sheamus returned to WWE with an entirely new look.
It was a mohawk and a bit of an unconventional beard. Sheamus would hear "you look stupid!" Chants from the WWE Universe every appearance he made, and he loved every bit of it. The WWE higher-ups seemed to enjoy it as well, as he won the Money in the Bank briefcase in 2015 and cashed it in on Roman Reigns to win the World Title at Survivor Series that year.
His WWE World Title reign lasted less than a month, but his heel turn and change in look turned out to be a big success in 2015. While he hasn't had the same level of singles success since he spent nearly 3 years from 2016 to 2019 along with Cesaro as a part of "The Bar" - where he enjoyed great success in the WWE Tag Team division on both RAW and SmackDown.