#4 Brock Lesnar

In the days of old, a top champion had to fight every night of the week and twice on Saturdays and Sundays. But in the Reality Era, the champion got to have a much different schedule. The Beast Incarnate, Brock Lesnar, is a part-timer with Championship status and there's not much anybody can do about it either.
The Undertaker's WrestleMania winning streak was ended by Brock Lesnar at WrestleMania XXX. This not only solidified the dawn of a new reality-based era of pro wrestling but also destroyed many childhoods in the process.
His destructive presence made the Reality Era all that much more legitimate as he plowed through his competition with the greatest of ease.
Brock Lesnar held the WWE Championship for 224 days after destroying John Cena at SummerSlam 2014. It took Seth Rollins cashing in his Money In The Bank briefcase at WrestleMania 31 and turning Lesnar's match against Roman Reigns into a surprise triple threat to dethrone the Beast Incarnate.