#4 Mankind
There's no denying that Mankind was everything you expected in a twisted psychopath, and while he stands as one of the most greatest performers in this business, he has achieved it so by putting his body and soul on the line.
Mankind's twisted head caught a lot of attention during the Attitude Era, and his strange demeanor catapulted him to the top of the mountain.
His gruesome encounters with the Undertaker and Kane back in the day were successful in establishing Mankind as one of the most fearless performers of that generation.
His Hell in a Cell match with the Undertaker is too hard to put into words and was possibly responsible in changing the entire complexion of the business, and all that came after it.
The crazy bumps that he took in the ring during his encounters with the Undertaker followed by a dark smile on his face was something that shocked the core of the audience, and was influential in making Foley who he is today.
A lot of the current WWE superstars consider Mankind one of the strangest dark dispositions to ever step foot inside the squared circle.