I have a new AU in mind (this will be set after frozen empire so I'll write it without spoilers)
So there had been legends of people that were gifted with the ability to shift into dragons and these people are giving special gifts that they use to fight evil, they had been linked with the defeat of many enemies but they had been driven into hiding by humanity. Now it's been years since the events of summer ville and the Spenglers are back in new York fighting ghosts but still have the mystery of what happened to talyn Spengler a few years ago as she had seemingly vanished into thin air. Now there had been a new enemy on the rise that had yet again started controlling not just ghosts but something that people had only been told are myths, dragons! and to top it off there had been sightings of two in particular that were paying interest in all activity to do with the ghostbusters. When a new girl inturns at the paranormal research center she sets off a few alarms in the Spenglers mind but for lars pinfield he finds himself weirdly draw to this girl.