#1 Paul Bearer
Perhaps the most surprising debut in TNA history, Paul Bearer appeared on TNA in November 2002 under the name Percy Pringle III.
One of the all time greatest managers in history, most famously associated with The Undertaker and Kane, Paul left WWE TV due to his desire to no longer be a TV character, as well as tend to his ill wife. So, that is why it was so surprising to see him show up in TNA as a TV character.
Corey Graves deleted his Tweet! More details HERE.
Paul spent his first few weeks keeping fans and wrestlers guessing if he was to join Vince Russo's Sports Entertainment X-treme faction or not. He would eventually be beaten up and bloodied by Russo's boys, to write him off TV. He would return for a few more appearances in early 2003 before departing and returning to WWE in 2004.