#4. Brock Lesnar - Universal Champion

Everyone thought Brock Lesnar would be returning to MMA so he would be leaving WWE shortly after last year's WrestleMania, but he defeated Roman Reigns and held onto the Universal Title.
Then he stuck around for a year on-and-off and ended up facing Seth Rollins for the Universal Title at this year's WrestleMania and lost. Then everyone thought that was it for Lesnar in WWE for a while and that we wouldn't see 'The Beast Incarnate' again for a long time.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
How wrong were we? Very wrong. Not only did Brock Lesnar return to WWE and win the Money in the Bank briefcase, but he cashed in his briefcase against Seth Rollins to become Universal Champion again.
Lesnar is now defending his title against SummerSlam. That is, of course, if Seth Rollins even makes it to SummerSlam after the beating he received from Lesnar on Monday Night Raw. But either way, it certainly seems like Lesnar is not leaving WWE and is here to stay as a permanent fixture.