Jake Kong Jr.
Tracy the Gorilla
Ghost Buggy (voiced by Pat Fraley) is the Ghostbuster car. He can talk, fly, and travel through time. He often complains about having to work with the Ghostbusters.
- Belfry (voiced by Susan Blu) is a small pink bat who can give off a powerful scream. Likes to tag along on the Ghostbusters' adventures, but they usually try to keep him at the relative safety of the office.
- Fuddy (voiced by Lou Scheimer) is a magician's apprentice. When the full moon is out Jake can call on him to cast a spell to help, but Fuddy's magic rarely works the way it's supposed to.
- Corky is Jessica Wray's nephew.
- Time Hopper is a scooter that Futura uses to get around.
- Ghost Busters Car is the original Ghost Buggy.
- Morrow is the brother of Futura
- Ansabone which serves as their wisecracking phone
- Shock Clock a cuckoo clock which instead has a pop-out skull
- Skelevision a living TV set
- Skelevator which they ride up into the machine that changes the Ghostbusters into their uniforms.
Villain Ghosts and Straight Villains
- Prime Evil (voiced by Alan Oppenheimer) is a robotic-looking ghost wizard. Extremely powerful--the Ghostbusters' dematerializer doesn't work on him unless they can make it stronger. He has trouble saying the word "Ghostbusters" and usually substitutes epithets like "Ghostbunglers."
- Haunter (voiced by Peter Cullen) is a hunter ghost with an English accent. Often gets in trouble for calling Prime Evil English endearments like "Old Bean" or "Old Boy."
- Sir Trancelot (voiced by Lou Scheimer) is a knightly ghost. He wields the Trace Lance, the rays from which can knock people out.
- Frightmare is Sir Trancelot's horse.
- Long John Scarechrome (voiced by Alan Oppenheimer) is the self proclaimed "Sailor of the Seven Galaxies," a pirate-themed ghosts with bionic body parts.
- Apparitia (voiced by Linda Gary) is a ghostly sorceress. She speaks in the style of the classic entertainer Mae West.
- Big Evil is the nemesis of Prime Evil and is always trying to take over Hauntquarters.
Minor or one-off Villains
- Flossy is the female Tooth Scary that had the hypnotic guitar.
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