The idea for this RP takes place in a custom universe with an original story where a group of teens in New York City begin hunting various paranormal threats. My character will be the son of a custom version of Egon Spengler, who became obsessed with the paranormal and was eventually kicked out by his wife. She refused to let my character have any further contact with his father because she thought he was crazy and getting worse, and he lived the next ten years without him. Now, at age seventeen, my character discovers his father has died in an apparent car crash while frantically driving upstate, and had lived just a few miles away all this time, in an old firehouse in Manhattan. He goes there with his mother to clean the place out so it can be sold and discovers a hidden lab in the basement.
From here, my character sees his father's research and the schematics and prototypes for various paranormal-related equipment. He becomes fascinated by them, and brings his friends (your characters) the next day after school to check out the lab. They end up getting dragged into the mystery of why Egon was in such a hurry to get upstate, what his destination was, and why he spent all these years trying to prepare for some kind of upcoming supernatural event. Eventually, apparitions begin appearing with increasing frequency, just as Egon's journals said they would, and the teens decide to use Egon's tech to become "Ghostbusters."
One way that this RP will deviate from normal Ghostbusters is that once our characters have been exposed to the paranormal energies of the ghosts long enough, they begin to develop supernatural powers themselves. Feel free to throw some ideas around for how you want shape your individual abilities. My character will be able to condense paranormal vapors into a glowing neon green ectoplasm and use it in various liquid and solid forms, sort of like a fusion of waterbending and earthbending. Visually, his abilities would look like green slime whips, green water waves, green crystal spikes and chunks, etc. As he grows and learns, eventually he'll be able to manifest gas and plasma forms instead of just liquid and solid, as well as more complex structures.
Please share your ideas XD.