#6 Mordecai
After the WWE brand split, Smackdown struggled to find its audience. Between bouncing around from one network to another and having the B list WWE stars (except for Undertaker, which we'll get to in a moment) the show had flagging ratings and little fanfare.
Bruce "Brother Love" Pritchard was chosen to be Smackdown's new creative head. He decided that Smackdown should be the home of 'extreme' gimmicks. Pritchard needed something to test the waters and additionally needed a credible opponent for The Undertaker.
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Thus Mordecai was born, aka faux vampire Kevin Thorne. Mordecai was the 'evil' Undertaker....as silly as that sounds, it was even worse to behold. Giving long, rambling interviews and making extensive use of pyros is what Undertaker does. Having another guy with less charisma and in-ring ability cheapens the Undertaker more than it enhances him.
Thankfully, this didn't last long, as fans despised the obviously pandering gimmick, and they were never fond of Kevin Thorne, to begin with.