#4 Batista
In 2014, WWE figured the fans might accept Batista as the new face of the company but it didn't quite turn out as expected for him.
Nothing went according to plan for the Animal as he was continuously booed by the crowd--akin to the reception Roman Reigns generates from the crowd today. Soon, Batista left the company and has since appeared in a number of Hollywood blockbusters.
However, now is a good time for the former world champion to come back and introduce himself as a heel. The lack of interesting villainous characters on the roster, right now, begs for a flagship name to intervene and make the negative gimmick great again.
#3 Kazuchika Okada
Another wrestler from NJPW, Okada is an exceptional athlete growing in popularity by leaps and bounds. He is the longest-reigning IWGP Heavyweight Champion in history at 720 days and also holds the record for the most successful title defenses at 12.
It comes as no surprise that the Japanese superstar is considered as one of the most decorated champions in NJPW's history. Okada's matches with the likes of Kenny Omega and Chris Jericho are instant classics.
The fact that Okada is just 30 years old makes him a very attractive investment for WWE.