Characters: Extreme Ghostbusters
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- Voiced by: Maurice LaMarche
- Badass Grandpa: Even in his late thirties (as stated in "The Sphinx"), he's still capable of entering the field when he needs to.
- Cool Old Guy: He is one of the co-founders of the Ghostbusters, after all.
- Mentor Archetype/The Obi-Wan: To the younger Ghostbusters.
- Retired Badass: He starts the series as a teacher at New York University and also watches over the Containment Unit after the other original Ghostbusters leave to follow other pursuits. However, he won't hesitate to venture out into the field when he has to.
- Riddle of the Sphinx: He figures it out in "The Sphinx."
- Sesquipedalian Loquaciousness: He sometimes speaks this way. Lampshaded when Eduardo asks Kylie to translate his "Egonics".
- Specs of Awesome: Has acquired these over the years.
- Voiced by: Pat Musick
- Composite Character: She combines her character design from the later seasons of the previous show with her snarky personality from the earlier seasons of said show.
- Deadpan Snarker: Janine makes funny and witty remarks.
- Fiery Redhead: Has red hair and is quite passionate at times.
- Meganekko: Wears glasses.
- Retired Badass: Proves herself to still be capable of ghostbusting in "A Temporary Insanity."
- Sexy Secretary: She's the Ghostbusters' secretary, and she's gorgeous.
- Voiced by: Alfonso Ribeiro
- Acrofatic: "The Infernal Machine" shows him to be quite agile even though he doesn't have an athletic physique.
- Ascended Fanboy: Of the Ecto-1, which he gets to upgrade and drive.
- Berserk Button: Don't mess with the equipment.
- Black and Nerdy: Roland is an African-American teenager with an intellectual personality.
- Companion Cube: The Ecto-1.
- Dating Catwoman: With Syren in "Sonic Youth," though nothing much develops from it.
- Genius Bruiser: Roland is tall and stocky, but extremely smart.
- The Hero: Shares this role with Kylie.
- Horrible Judge of Character: It's obvious to everyone that Roland's younger brother Casey is an annoying troublemaker, but not Roland himself.
- Ironic Fear: He's afraid of his equipment malfunctioning even though he's good with machines.
- The Smart Guy: Shares this role with Kylie.
- Suspiciously Similar Substitute: To Winston.
- Voiced by: Tara Strong
- Badass Longcoat: In the premiere episode only.
- Berserk Button: Don't use her late grandmother as a way to attack her.
- Canon Immigrant: Kylie appears in the Ghostbusters comics based on the original movie.
- Catch Phrase: Tends to say "I'm not a (blank)."
- Custom Uniform: She and Eduardo do not wear standard uniforms.
- Deadpan Snarker: Kylie often makes witty comments.
- Eerie Pale-Skinned Brunette/Raven Hair, Ivory Skin: Kylie sports black hair and has pale white skin.
- Goth: Gloomy Goth variant, though it's worth mentioning she isn't nihilistic or pessimistic.
- The Hero: Shares this role with Roland.
- The Smart Guy: Shares this part with Roland.
- Too Spicy for Yog Sothoth: When she is directly confronted by ghosts, they often leave her alone upon seeing that they can't manipulate her.
- Voiced by: Rino Romano
- Arbitrary Skepticism: Prior to meeting Slimer.
- Berserk Button: Don't call him "daisy."
- Brilliant but Lazy / Dumbass Has a Point: Every now and then, he'll show to the rest of the team that he's much smarter than they give him credit for. However, he's not very motivated to do so.
- Canon Immigrant: Like Kylie, he appears in the Ghostbusters comics based on the original movie.
- Catch Phrase: "Maybe he's dead."
- "We're scientists."
- Character Development: Starts out as a lazy Jerkass, but later grows out of it.
- Custom Uniform: He and Kylie do not wear standard uniforms.
- Deadpan Snarker: Shows a funny wit at times.
- Gratuitous Spanish: He often uses Spanish words, being a Latino.
- Hidden Depths: Is surprisingly an avid reader. He even lampshades this in one episode.
- Ironic Fear: He is afraid of death, particularly his own, which is ironic because he often jokes about disappearances by saying "Maybe he's/she's dead."
- Jerkass / Jerk with a Heart of Gold: Starts out as the former trope, but grows more into the latter as the series develops.
- The Slacker: It's the reason he took Egon's class to begin with!
- Suspiciously Similar Substitute: To Venkman.
- Voiced by: Jason Marsden
- Ascended Fanboy: He was a huge fan of the Ghostbusters and is now the member of the new team.
- The Big Guy: He is the most athletic and aggressive of the group.
- Boisterous Bruiser: He just loves busting ghosts—and showing off how Badass he is with a variety of crazy stunts.
- Bond One-Liner: He often gives these when he captures ghosts.
- Claustrophobia: His biggest fear.
- Composite Character: Combines Stantz's love for his ghostbusting career with Venkman's cockiness.
- Deadpan Snarker/Disabled Snarker: Garrett likes to make with the dry and witty remarks.
- Disabled Means Helpless: Garrett shows he's quite capable and self-reliant despite his paralysis. However, in "Grease," he fakes this trope just long enough to escape from two FBI agents.
- Handicapped Badass: Don't let his handicap fool you; Garrett can kick lots of ghost ass.
- Voiced by: Billy West
- Brainwashed and Crazy: In "Slimer's Sacrifice," Slimer is brainwashed by Surt to attack Eduardo.
- Category Traitor: Surt even lampshades this in "Slimer's Sacrifice."
- Heroic Sacrifice: In the appropriately-titled "Slimer's Sacrifice," he flies into the Containment Unit to keep all the other ghosts from getting out after a faulty ghost trap causes things to go haywire.
- Non-Human Sidekick: To the Ghostbusters. He's a ghost and they're humans.
- Voiced by: Susan Tyrrell
- Demonic Possession: She possessed Kylie for a brief time.
- Flight: Displayed this power.
- Sealed Evil in a Can: Until construction workers breached her prison.
- Shock and Awe: Her minions (attached to her body) could electrocute people.
- Starter Villain: Achira is the first villain to be faced by the new ghostbusting team.
- The Virus: Achira spread a virus that was actually her offspring.
- Voluntary Shapeshifting: Achira made herself appear as Grandma Rose to Kylie so she could get close enough to possess her.
- Anti-Villain: Type IV. The Golem was created to protect a Jewish synagogue from racist attackers.
- Guardian Entity: Created by a Jewish rabbi to protect a synagogue from anti-Semitic vandals.
- Healing Factor: The Golem could heal any wounds extremely fast.
- Super Strength: One of its powers.
Fear ghostThe main antagonist of "Fear Itself."
- Harmless Villain: When the Ghostbusters finally confront it, it cowers in fear and does not fight back.
- Your Worst Nightmare: It could bring people's worst fears to life.
Crainiac, Corpuscle, and GristleThe main antagonist of "Deadliners."
- Body Horror: They inflicted this upon their victims, surgically transforming them into grotesque abominations.
- Expy: Of the Cenobites.
- Fat Bastard: Crainiac
- Teleporters and Transporters: Crainiac
KahlilThe main antagonist of "Casting the Runes."
- Dimension Lord: Ruled over a dimension that strongly resembled Hell.
- Fire and Brimstone Hell: Kahlil's home dimension resembles this trope.
- I'm a Humanitarian: He tried to eat Roland and Kylie until he was stopped by Eduardo and Garrett.
- Kneel Before Zod: He forces Kylie and Roland to kneel before him.
- My Brain Is Big: Had a VERY large head.
Kahlil's messengerKahlil's minion. Appears in "Casting the Runes."
LukoThe main antagonist of "The Infernal Machine."
- Animate Inanimate Object: Items he possesses include construction equipment and a child's toy robot.
- The Corrupter: To Roland.
- Demonic Possession: It possessed machinery.
- Evil Sounds Deep: Spoke in a deep, scary voice.
- Flight: In spirit form.
- Sealed Evil in a Can: He was imprisoned in an inventor's machine until he broke free by possessing modern technology.
- Genius Loci: It is the spirit of a house, after all.
- I'm a Humanitarian: Fed on humans to sustain itself.
- Haunted House: Actually, it was the house itself.
Evil ClownsThe main antagonists of "Killjoys."
- Monster Clown: They disguise themselves as clowns to get people to laugh so they can eat them alive.
- Our Vampires Are Different: Kylie surmises that they are a vampire analogy that feed on laughter instead of blood.
TenebraugThe main antagonist of "The Unseen."
- Eldritch Abomination: Tenebraug is classified as a Class 13 ghost.
- Eye Scream: It stole the eyes of anyone unfortunate enough to gaze upon its orb.
- Hoist by His Own Petard: Tenebraug is destroyed after gazing upon its own orb.
- Sealed Evil in a Can: Was trapped inside an orb.
- Voiced by: Fernando Escandon
- Sealed Evil in a Can: He was imprisoned inside a sarcophagus until two greedy thieves removed the enchanted jewel in his mouth.
- Sharp-Dressed Man: In human form.
- Shout-Out: The name he uses in his human form, Gregor Samsa, is this to The Metamorphosis.
- Voluntary Shapeshifting: Can shift between human and bug form at will.
- Voiced by: Roger Rees
- Belly Mouth: In his true form.
- Humanoid Abomination: Until his true form is revealed, he looks indistinguishable from a normal human.
- Would Hurt a Child: He attempts to drown New York's children when the mayor refuses to give in to his demands.
- Voiced by: Jonathan Harris
- Hoist by His Own Petard/Logic Bomb: He is defeated when Kylie wishes that he doesn't grant her wish, the confusing nature of the paradoxical wish causing him to reveal his true form and become easy to trap.
- Literal Genie: Granted people's wishes in the literal sense. The results weren't pretty.
- Breath Weapon: It could turn metal objects to rust.
- Giant Flyer: The Jersey Devil was a giant, winged creature.
Dry Spell ghostThe main antagonist of "Dry Spell."
- Sealed Evil in a Can: Freed from underwater ruins.
- Voiced by: Mary Kay Bergman
- Dark Is Evil: She wears black and is obviously a villain.
- Eerie Pale-Skinned Brunette / Raven Hair, Ivory Skin: When she looks more human.
- Evil Wears Black: Banshee wears an all-black ensemble and is VERY bad news.
- Hot-Blooded: Has quite a temper.
- In the Hood: In "Slimer's Sacrifice."
- Jerkass: Especially towards her sister Syren.
- Make Me Wanna Shout: Her wail can shatter solid objects.
- Sibling Yin-Yang: With Syren. Banshee is volatile, rude and ill-tempered, while Syren is calm, peaceful and nice.
- Voiced by: Melissa Disney
- Anti-Villain: Syren is a Type II. She doesn't want to be evil; she just wants to help her sister. Until she finally realizes how much of a bitch Banshee is.
- Dating Catwoman: With Roland, though nothing much comes out of it.
- Hair of Gold, Heart of Gold: Syren has blond hair and is shown to be very sweet and kind.
- In the Hood: In "Slimer's Sacrifice."
- Light Is Good: Syren wears a white dress.
- Nice Girl: Contrasting with her sister Banshee.
- Sibling Yin-Yang: With Banshee. Syren is calm, peaceful and nice, while Banshee is volatile, rude and ill-tempered.
- Voiced by: Clancy Brown
- Evil Gloating:Tempus: Congratulations, Professor Spengler, you get to bear witness to the beginning of the end of humankind!
- Flight: Showed this ability.
- Playing with Fire: Could throw fireballs.
- Take Over the World: His Evil Plan.
HarasvelgThe main antagonist of "Bird of Prey."
- Giant Flyer: The Harasvelg is a giant, bird-like creature.
ShanbahacThe main antagonist of "Seeds of Destruction."
- Gaia's Vengeance: He possesses plants and uses the hosts to attack people.
LeprechaunThe main antagonist of "Luck of the Irish."
- Revenge: Seeks this on the descendants of those who imprisoned him in the first place.
- Sealed Evil in a Can: Thanks to a band of humans, one of whom was Mayor McShane's ancestor.
- Voiced by: Glenn Shadix
GhostmakersMooks of the Mirror Demon in "The Ghostmakers."
- Grand Theft Me: Their modus operandi. They kick people's souls out of their bodies and inhabit said bodies.
FenrisAppears in "Slimer's Sacrifice."
- Animalistic Abomination: He resembles a very large wolf with pointy feet.
- An Ice Person: Breathes ice.
SurtThe main antagonist of "Slimer's Sacrifice."
- Creepy Monotone: Surt speaks in a quiet and eerie voice.
- Dimension Lord: Rules the dimension inside the Containment Unit.
- Playing with Fire: He can project flames.
- Remember the New Guy: He only appeared in Extreme Ghostbusters, but was mentioned as being captured during the events of The Real Ghostbusters.
- Sealed Evil in a Can: He was trapped inside the Containment Unit by the original Ghostbusters years ago.
The GrundelThe main antagonist of "Grundelesque."
- Adult Fear: A tall creature in a coat who kidnaps your children and manipulates them into being bad.
- Arch-Enemy: To Kylie.
- The Corrupter: To Kylie's friend Jack.
- Evil Sounds Deep: Speaks in a deep, creepy voice.
JackAppears in "Grundelesque."
MorpheusThe main antagonist of "In Your Dreams."
- Hoist by His Own Petard: His plan to cross over into the real world through people's dreams would have worked if it weren't for the Ghostbusters immediately realizing that crossing over made him trappable and capturing him on the spot.
LotanThe main antagonist of "Moby Ghost."
Mountain Spirit (Radioactive Ghost)
- Sealed Evil in a Can: He was imprisoned inside a golden dragon statue until it was destroyed.
- Humanoid Abomination: Appears to be human when she first appears, but then changes into a skinless form.
- Sealed Evil in a Can: A well, to be exact.
- Yandere: To poor Leonard Bates.
- Sadly Mythtaken: The actual Ravana was a humanoid being with many heads rather than a cat-like demon who switched between fat and skinny forms.
- Villainous Glutton: He possesses people in a way that makes them devour food endlessly.
Oil Mine Ghost
- Sealed Evil in a Can: Laid dormant until oil drillers disturbed it.
- Animalistic Abomination: Resembles a giant dog.
- Humanoid Abomination: When she first appears.
- One-Winged Angel: Takes on the form of a hideous, mermaid-like creature when she learns the Ghostbusters captured her dog.
Energy and Lightning Demons
S.I.D.N.E.E.The main antagonist of "Back in the Saddle, Part Two."
- The Bermuda Triangle: It's revealed to be this.
- Eldritch Abomination: Underneath its foggy exterior, it is a gray blob-like creature with a lamprey-like maw.
SphinxThe main antagonist of "The Sphinx."
- Sadly Mythtaken: He is meant to be based on the Greek Sphinx, but wears Egyptian regalia.
- Villainous Breakdown: Has one when Egon correctly answers his riddle.
- Voiced by: Ron Feinberg
- Voiced by: Billy West
- Arbitrary Skepticism: Absolutely refuses to believe in the paranormal despite having interacted with Piper and later being captured by a Leprechaun.
- Jerkass: To the Ghostbusters.
- Ungrateful Bastard: In "Luck of the Irish," after the Ghostbusters save him from the Leprechaun, he takes all the credit.
- Jerkass: He shows disdain towards Roland and is later revealed to be one of the jerks who attacked the Jewish synagogue.
- We Used to Be Friends: With Garrett by the final act of "The True Face of a Monster."
Jack Stone and Harry Gannan
- Self-Deprecation: They were clearly meant to make fun of Men In Black: The Series which, like Extreme Ghostbusters, was also made by Adelaide Productions.
- Voiced by: Tony Jay
- Voiced by: John de Lancie
- Mad Scientist: There's not much else you would call a man who attempts to use special collars to enslave the spirit world.
- Mind Control: Kirilian used devices to control ghosts and have them do his bidding.
- We Used to Be Friends: With Egon.