Here's an apparition that never had the chance to materialize in Tremorton. According to the original series bible, "the Polterguest" was to be the one kid more desperate for teenage friendship than Jenny. However, at the time Rob pitched the character, the network felt the idea tread to far into "Danny Phantom" territory. As you can see, we didn't even get the chance to decide on a gender for the character.
I mourn this lost soul for a couple of reasons; a phantom flapper would have been a great way to extend the 1930's theme into the show, and a supernatural character would have been a great way to expand mlaatr's world beyond the science fiction genre. Too bad she hadn't a gost of a chance.