Dr Peter Venkman played by Jim.
Dr Peter Venkman is a parapsychologist.
Jim is a rather gung-ho roleplayer, interested in action, cool fight scenes, and lucrative spoils over careful consideration or puzzle solving. He frequently acts before he thinks, which includes fixating on his own strange explanations for setting details that the GM hasn't explained yet.
Dr Raymond Stantz played by Ben.
Dr Raymond Stantz is a parapsychologist.
Ben is a thoughtful roleplayer who tries to think through the best course of action within his character concept and the setting. He enjoys coming up with clever ways to justify the success of his plans within the premises of the setting.
Louis Tully played by Pete.
Louis Tully is an accountant who lives next door to Dana.
Pete is an old friend of Jim's. Jim invited him along to join in this new game. Pete designed a character to maximise all the skills he thought would come in most useful in a supernatural monster-fighting campaign, at the cost of being Ultra-Nerdy, Awkward Around Women, and Easy to Possess.
Dr Egon Spengler played by Sally.
Dr Egon Spengler is a parapsychologist.
Sally is somewhat younger than the other players, but has grown to be an integral part of their gaming group. She has an active imagination and enjoys inventing details about the game setting and characters. Her gaming style is maturing as she grows older.
Dana Barrett played by Annie.
Dana Barrett is a musician who lives next door to Louis.
Annie was interested to come along and see what this "roleplaying games" thing was all about, hearing it was a sort of improvisational acting thing. She is dedicated to playing her character as a real, complex person with motivations inspired by a well-considered backstory.
Winston Zeddemore played by Corey.
Winston Zeddemore is a new member of the Ghobstbusters team, hired to help deal with demand.
Corey is Pete's nephew and was keen to play the "cool roleplaying game" that Pete told him about. The GM invited him to join, but Corey was surprised to find that there were no computers involved. He is new to the world of tabletop RPG gaming.
Janine Melnitz is the receptionist and secretary of the Ghostbusters. She keeps an eye on the company and tries to keep everyone out of trouble, which seems to be a very difficult thing to do with so many ghosts running around.
Walter Peck is a lawyer for the Environment Protection Authority. His main concern is the unlicensed Lost Orb of Phanastacoria that the Ghostbusters are using to confine ghosts in their basement.
Mayor Lenny is the Mayor of New York. He uses his great wisdom and popularity to convince the public there is nothing to worry about from ghosts. How exactly he gets away with this is a mystery.
Gozer, The Destructor, is an ancient Sumerian shapeshifting god. Venkman thinks he could be fun at a party but Stantz thinks he's a dangerous supernatural presence in the city. Who is right remains to be seen.