#1. Daniel Bryan

Daniel Bryan has been a great heel, and his current heel run has been his very first one since returning from retirement. Bryan became WWE Champion after defeating AJ Styles, and then went on to have that fantastic feud with Kofi Kingston.
In a lot of ways, Kofi Kingston's dream run to WrestleMania 35 would not have happened if it had been for a heel Daniel Bryan and his new gimmick. He was incredible as 'The New Daniel Bryan', and he has sinc e gone on to win the SmackDown tag team titles.
WWE fired her, but she started earning more than ever - Check out!
But Bryan should be back in the singles scene, which is where he thrives in. Most WWE fans want to see a feud between Bryan and Seth Rollins, but that may not happen anytime soon because both Superstars are on different brands (yes, the Wildcard rule could come into play, but not every week) and Rollins is currently in a feud with Baron Corbin and later most likely with Brock Lesnar.
Bryan has been a fantastic heel over the years, and the underdog story that he has showcased previously, could be revived once again when he turns face.