I am not sure if it began in the WWE after the brothers split or not, but didn't the "Charasmatic Enigma" character for Jeff begin in TNA with his first run... The one where he'd come crawling out on the ramp with glow in the dark paint smered all over himself (yeah, he didn't look like a druggie hopped up on some halucinogenics when that was going on... Not at all
) set to perhaps the worst song his band ever produced. The reason why I am asking is because this was the character he brought back to his WWE run. I think character (along with the fact that it was Jeff Hardy) helped TNA to push Jeff into higher profile matches besides the dream matches of Abyss/Hardy and Styles/Hardy. Once he started pushing the Enigma character, it took off and the fans were giving him some genuine reactions to it.
The reason why I bring this up is because Hardy was/is a foundation player for TNA because Hardy was able to use his 'creativity' to allow more of his artistic side to come out in the character he played in the ring (even if his mic skills were always questionable during this time). TNA gave him the room to breath with his character which allowed for him to maintain the cult following that he still has to this day. Hardy might not be a TNA original, but he is in the same category with Christian, D-Lo, and Angle in that he is one of the guys who was already known when joining TNA, helping them to gain a new aspect of fans.