#3 Lars Sullivan
Lars Sullivan debuted on the WWE main roster on the night after WrestleMania and has been attacking legends ever since then. His list of victims so far has Kurt Angle, the Hardy Boyz, Rey Mysterio and R-Truth.
This is pretty impressive and is reminiscent of the way Brock Lesnar jumped onto the scene in 2002. He just went around, destroying people left, right and centre. This level of dominance from Sullivan could certainly match Lesnar's mean streak, especially if WWE goes all out with him.
The Beast won the WWE Championship at SummerSlam 2002, five months after debuting on WWE TV. It may be a stretch, but WWE could book the Freak in a similar way. Sullivan could be the one to dethrone Kofi Kingston and become a world champion in extremely short order.
It would be an extremely unpopular decision with the fans, but that would be a good thing to give him even more heat. It certainly isn't out of the question, considering that the original plans for Lars Sullivan at WrestleMania 35 were for him to beat John Cena.