Dr. Egon Spengler: Former Paranormal Studies teacher Dr. Egon Spengler helped create the Ghostbusters team by inventing the powerful proton packs used to capture ghosts and even the storage facility to contain them!

Library Ghost: The first ghost encountered by the Ghostbusters, former librarian Eleanor Twitty haunts the New York Public Library and spends most of her time creating huge stacks of library books.