Phoebe (Mckenna Grace)

Phoebe is the youngest child of Callie Spengler and is quite the oddball. She tells bad jokes and is very deadpan, but also very smart, all in the mold of her grandfather, Egon Spengler, whom she never met nor was aware of, until the move to Oklahoma.
Once Phoebe realizes her grandfather was a Ghostbuster, she discovers some of the tech he left behind and begins to bust ghosts with the help of her new (and only) friend, Podcast (Logan Kim). Eventually the pair, along with her brother and others, fight the evil Gozer, who is defeated when Egon’s ghost comes and helps Phoebe.