Well... I think this one is going to be fairly simple from my point of view.

Eiko has claimed to be the cop along with Zidane. Either she was lying about that as well as well as Zidane, or she actually is the cop.

That makes the last vanilla town me or Vivi. Even if Vivi claimed cop at this point I don't think there's anyway I could believe him over Eiko so:

​##Vote: Vivi