#6 Heidenreich
During the mid-2000s, there were a string of Superstars introduced on SmackDown that WWE tried to shoot straight to the top. They would do that by inserting them into an angle with The Undertaker very early on in their careers, from day one almost.
One of those Superstars was Heidenreich. The character Heidenreich portrayed was one of a psychopath. He and his unhinged friend Snitsky looked set to take on Kane and The Undertaker at WrestleMania 21.
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The Deadman apparently decided that he'd rather face Randy Orton instead and that's the match that happened. Following that, WWE formed a new Legion of Doom between Heidenreich and Road Warrior Animal, but it didn't wind up being an idea that had any traction.