I personally would go with a gimmick of someone who believes that the fans pay their money purely to see someone get the crap kicked out of them. So, on occassion i'd come through the crowd during a promo or a match and just batter a random superstar with a weapon, and then when the crowd boo me, i'd be all like 'hey, this what you wanted isn't it?' except i don't discriminate between heels or faces, wrestlers or other tv personalities. Hell, i'd even batter my tag partner regardless of whether we were a great team or not, and claim that no one is exempt from the bloodlust of the fans. I'd even do a segment where i throw in footage of me going to FCW and battering a trainee, kinda like Taker did to David Flair once.
Anyway, the character would do what it wanted. I've always envisioned the charcter being undefeated for simply ages, either throwing titles away because he simply doesn't care about them, or losing in triple threat matches but not being the one to get pinned. I'd also hope to win the RR, by coming out in the single digits positions and then doing commentary for the WHOLE match, and then get in after the 2nd to last guy was eliminated and throw him out, a la Vince McMahon, except anyone who tried to throw me in the ring would get a chair in the face, and they'd get thrown in themselves.
My catchpharse would be something along the lines of:- "And once again, i stand before you to provide exactly what you the bloodsucking leeches we call fans, paid you're hard earned money to see. Pure, unadulterated, 100%, GUARANTEED (and then in a metal vocal style) BLOOD! SWEAT! AND TEARS! so that the fans can interact with the character.
As for theme music, i'd want to use 'Born Again Anarchist' by Soulfly to reflect the attitude of the character, or 'Ghost of Perdition' by Opeth, because it has a small piano introduction, which would be followed by a pyro and then kicks straight into the song. That way, people know it's me coming and then the song gives the impression that all hell follows me wherever i go..
