The Other Annie

looks and sounds exactly like annie and has her name, but is either a ghost or an OAP. davon is a little pissed at jimmy because jimmy didn't tell him that there was a ghost in the area and thereby didn't give davon the chance to bust her and prove to the world that he really is the fifth secret ghostbuster.

jimmy killed her on instinct, but it this was due to a misconception and she was just trying to help. the other annie was likely one of the only benevolent hungry undead monsters out there, and there was always the possibility that she may have actually been annie and was trying to hide her identity from jimmy so as not to make him sad.