#2. Shinsuke Nakamura
Shinsuke Nakamura's WWE career has been on a downhill trajectory over the last few months, and the former WWE Champion's decline can be traced back to that dream match against AJ Styles at WrestleMania 34, where the Japanese Superstar turned heel.
He has since then been involved in the WWE Championship and United States title feuds, but hasn't done much to take his character to the next level.
When he was called up to the main roster, many fans expected him to be a future WWE Champion, but that hasn't happened yet; in fact, he has become a mid-card afterthought and has been teaming with another Superstar who has been used ineffectively, Rusev.
Nakamura should go back to being a babyface as the fans loved his gimmick. There could also be some interesting feuds with the likes of Kevin Owens, Sami Zayn, and Elias, to name a few, if he does turn babyface.