The anti-character bunny! - A character's anti-verse version of them selves comes to start some trouble or help.
A) Anti-verse villains go out of their way to help the good guys!
B) Anti-verse heroes go out of their way to cause trouble for the good guys and end up pissing off the bad guys!
1) The antiheroes help the bad guys!
2) The antiheroes try to out do the bad guys and either succeed better or fail worse than the bad guys.
3) The antiheroes because such a pain in the ass that both the heroes and villains combined forces to get rid of the anti-verse hero!