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- Voiced by: Maurice LaMarche
- Cool Old Guy: He is one of the co-founders of the Ghostbusters, after all.
- Mentor Archetype: To the younger Ghostbusters.
- Missed the Call: He intended to go after the spud in "Slimer's Sacrifice," but an encounter with Fenris left him too sick to try.
- Oblivious to Love: As on RGB, he often misses Janine's overtures.
- 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.
- Took a Level in Badass: At the start of the series, he's rather out of shape and practice. Over time, he regains a lot of his old ghostbusting proficiency.
- You Are Better Than You Think You Are: He feels his age in "The Sphinx" and pushes himself (and the others) hard in the field to prove his worth. He ends up confiding in Garrett that he's exhausting and kidding himself at the same time. Garrett says the team does rely on him—not for butt-kicking, but for his wisdom and experience.
- Voiced by: Tara Strongnote
- Agent Mulder: A firm believer in the supernatural long before she ever laid eyes on an actual ghost.
- Badass Longcoat: In the premiere episode only.
- Belligerent Sexual Tension: With Eduardo. The two of them bicker like cats and dogs on a regular basis, but tend to enjoy each others' company in more ways than they care to admit.
- 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.
- Custom Uniform: She and Eduardo do not wear standard uniforms.
- Deadpan Snarker: Kylie often makes witty comments.
- Goth: Gloomy Goth variant, though it's worth mentioning she isn't nihilistic or pessimistic.
- The Hero: Shares this role with Roland.
- Ironic Fear: Of maggots. It might not normally count, but it's striking for someone so obsessed with the unusual.
- Kindhearted Cat Lover: Despite her appearance, Kylie loves her pet cat. Eduardo secretly gripes that she likes and treats her cat with more respect than to him.
- Mad Libs Catchphrase: Tends to say "I'm not a (blank)."
- Pom-Pom Girl: An old photo show that was "Cheerleader of the Year" when she was in the 8th Grade.
- Raven Hair, Ivory Skin: Kylie sports black hair and has pale white skin.
- The Smart Guy: Shares this part with Roland.
- Snark-to-Snark Combat: Often on the receiving end of Eduardo's teasing, in which she responds by either snarking back, yanking his goatee, or both.
- 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: 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.
- Big Brother Instinct: "Nobody touches my family or my friends!"
- Black and Nerdy: Roland is an African-American teenager with an intellectual personality. Oh, and he enjoys opera music.
- 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 else 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.
- Musical Assassin: Played with. Roland is a terrible violin player. Surprisingly enough, his bad violin playing actually hurts the Ghost Piper.
- Only Sane Man: He's generally far more relaxed and easygoing than his teammates.
- The Smart Guy: Shares this role with Kylie.
- Suspiciously Similar Substitute: He certainly looks like a young Winston, but his personality and interests are different.
- Techno Wizard: Can do almost anything with technology and quickly too.
- Voiced by: Rino Romano
- Arbitrary Skepticism: Prior to meeting Slimer.
- Audience Surrogate: Will often point out in a sarcastic way the oddity of another character or situation.
- Belligerent Sexual Tension: His dynamic with Kylie in spades. For all their leveled vitriol, there's an undeniable chemistry at work.
- Berserk Button: Don't call him "daisy."
- Black Sheep: Eduardo feels he is this with his own family, who are cops. He is always at odds with his cop brother, Carl, who regards the Ghostbusters as nothing more than thugs.
- Brilliant, but Lazy: 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 grows out of it.
- Chivalrous Pervert: He's a hopeless skirt chaser; however, he cares far, far more for a girl's personality than her looks. When a trio of Alpha Bitch witches tricks him into going on a "date" purely to use him as a fourth to summon an evil ghost, in the aftermath, he asks out... the homey girl they were picking on, telling the very physically attractive Ungrateful Bitch leader of said coven who snubbed him after he saved their lives, and restored them to humans, that she is not worth his time, to her face. Kylie can be seen smiling proudly in the background.
- Cool Uncle: Seen this was by his nephew, Kevin, especially after finding out he's one of the Ghostbusters.
- Custom Uniform: He and Kylie do not wear standard uniforms.
- Deadpan Snarker: More so than Kylie. If he sees something worth ribbing, he'll rib it.
- Gratuitous Spanish: He often uses Spanish words, being a Latino.
- Hidden Depths: Is surprisingly an avid reader. He even lampshades this in one episode. Not of the heavy stuff, it's mostly novels, though he did mention he read Homer's Oddity...
- Hidden Heart of Gold: He comes across as very abrasive and selfish. When nobody's looking, though, he's actually a real softie.
- I Am Not My Father: Eduardo's brother Carl never fails to belittle him about his life, lecturing Eduardo that he should make something of himself by becoming a cop like him and their dad. Eduardo angrily retorts that that's their dream, not his.
- 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 Lancer: He's lazy and far from leadership material, but when things go dire, Eduardo is usually the team's best on the action.
- My God, What Have I Done?: He denounces Slimer as useless in "Slimer's Sacrifice," which motivates the titular sacrifice. He feels so guilty that he eventually goes into the Containment Unit himself to get him back.
- Not So Different: Eduardo tends to do very badly in his science courses. Peter tells him he failed his fair share of classes, too, but it didn't stop him from becoming a scientist.
- The Slacker: It's the reason he took Egon's class to begin with.
- Snark-to-Snark Combat: With Kylie. He teases her to no end, and she responds in equal measure.
- Suspiciously Similar Substitute: To Venkman. Both are snarky and often irritated by Slimer. Both are also highly reluctant to admit fault in anything.
- Voiced by: Jason Marsden
- Ascended Fanboy: He was a huge fan of the Ghostbusters; now, he's a 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.
- Butt-Monkey: Tends to get thrown from his wheelchair at the worst possible time (or any time), has terrible luck with food and actually just has a lot of things go wrong for him in general.
- Claustrophobia: His biggest fear.
- Composite Character: Combines Stantz's love for his ghostbusting career with Venkman's cockiness.
- Disabled Means Helpless: Ha Ha Ha No. 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.Garrett: Never underestimate the abilities of the physically challenged!
- Disabled Snarker: Garrett, a paraplegic, likes to make with the dry and witty remarks.
- Everyone Has Standards: In "The True Face of a Monster", outright states that he'll do anything for an adrenaline rush, even sneaking into areas that are off-limits. But when the "fun" is destroying a house of worship, he's horrified and backs down.
- Friendly Address Privileges: Only his friends are allowed to call him by "Garr" or "G-Man"; the latter nickname ends up getting rescinded for his old friend turned racist vandal in "The True Face of a Monster".
- Glory Hound: He inherited Venkman's desire to get the most positive press possible at all times. When he finds out in the Bad Future that Eduardo is championed as a hero, but nobody knows who he is, he's beside himself with wroth and envy.
- Handicapped Badass: Don't let his handicap fool you; Garrett can kick lots of ass, ghost or otherwise...as long as he's in a wheelchair, or just chair.
- Heroic Resolve: Well, for starters, he's the only one in "Fear Itself" to overcome his own fear. The others just trade off.
- In-Series Nickname: Garrett is sometimes known by his friends as "G-Man". He only lets his friends use the name when he coldly tells Spencer never to call him that again.
- Inspirationally Disadvantaged: Somewhat. Extremely capable despite being wheelchair-bound, brushes off an extremely tasteless remark by Eduardo in the pilot and never lets his disability get in his way.
- Ironic Fear: His claustrophobia in "Fear Itself" eventually manifests as a coffin.
- Jerk with a Heart of Gold: Snarks about as often as Eduardo, but generally bighearted and fun-loving.
- Lovable Jock: Really enjoys sports and the adrenaline rush.
- Mad Libs Catchphrase: "_______ is for wimps!"
- Small Name, Big Ego: Never shy about patting himself on the back.
- Toyless Toyline Character: The only member of the team who didn't get an action figure, although a prototype exists.
- We Used to Be Friends: His old friend in "The True Face of a Monster" turns out to be a racist and a vandal.
- Weaksauce Weakness: Stairs. But let's face it, that's kind of a Real Life thing for any wheelchair-bound person.
- Why Did It Have to Be Snakes?: Besides his Claustrophobia, Garrett, despite trying to hide it, displays a fear of being helpless, most notably in "In Your Dreams" where his nightmare is about being in a situation where he's been knocked out of his chair and then trapped in a situation with no chance to escape on his own (since the chair seems to have disappeared entirely) and no one to come help him.
- Voiced by: Pat Musick
- The Chick: Does the least of all characters in most episodes and tends to be fairly feminine.
- Composite Character: She combines her character design from the later seasons of the previous show with her snarky personality and (admittedly, milder) accent 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.
- Friend to All Living Things: Reprimands Eduardo in "The Crawler" for trying to squash a harmless spider. This makes Cohila think she'd be a worthy queen.
- Lethal Chef: Janine can't cook at all. Her food is so bad, even Slimer doesn't want to eat it.
- 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: Billy West
- Big Eater: As ever.
- 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." Egon also mentions in "Ghost Apocalyptic Future" how the captured ghosts aren't very fond of him.
- Extreme Omnivore: Being infected by Ravana in "Glutton for Punishment" causes Slimer to eat every inanimate object in sight. It gets to the point where he endangers team operations and has to be put in a trap.
- 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.
- Shoot the Dog: The team has no choice in "Glutton for Punishment" but to stick him in a trap. Egon takes it pretty hard.
- Small, Annoying Creature: Certainly to Edurado.
- Team Pet: Just like with the RGB.
- Voiced by: Susan Tyrrell
- Body Horror: The disease she spread caused victims to grow green patches with pulsing boils on them. It gets worse later on with the revelation that the boils are her offspring.
- Demonic Possession: She possessed Kylie for a brief time.
- Flight: Displayed this power.
- Plague Master: Spread a virus (see Body Horror above for details).
- Sealed Evil in a Can: Until construction workers breached her prison. And it turns out that she wasn't alone, either.
- 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.
A gigantic clay Golem created by a Jewish rabbi to defend a synagogue against anti-Semitic vandals. The main antagonist of "The True Face of a Monster."
- Anti-Villain: The Golem was created to protect a Jewish synagogue from racist attackers but proves to be impossible to control.
- 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.
- No-One Could Have Survived That: Roland says that when the Golem's caught in an explosion. It walks out immediately afterwards. However, the damage it took from the explosion is the key to finally destroying it.
- Super-Persistent Predator: Two of the guys who attacked the synagogue ran the moment the Golem started rampaging. Thing is, it followed them.
- Super Strength: One of its powers.
- Turned Against Their Masters: The rabbi who created him orders him to stand down. The Golem responds by knocking him aside.
A spirit that brings people's worst fears to life. The main antagonist of "Fear Itself."
Crainiac, Corpuscle, and Gristle
The creations of horror novelist J.N. Kline. The main antagonists of "Deadliners."
- Body Horror: They inflict this upon their victims, surgically transforming them into grotesque abominations.
- Expy: Of the Cenobites.
- Fat Bastard: Crainiac
- For the Evulz: Have no reason for tormenting their victims besides finding it entertaining.
- Humanoid Abomination: Loosely so but they still have humanoid builds. And good gravy, are they horrifying to look at.
- Teleporters and Transporters: Crainiac.
The ruler of another dimension that strongly resembles Hell. The main antagonist of "Casting the Runes."
- Cool and Unusual Punishment: He forces Eduardo to...copy every book in his Library of Pain. By hand. And it's huge.
- Dimension Lord: Ruled over a dimension that strongly resembled Hell.
- Fire and Brimstone Hell: Kahlil's home dimension resembles this trope.
- Hoist by His Own Petard: The aforementioned Cool and Unusual Punishment proves to not be his best idea, when Eduardo finds in his books the spell needed to destroy him.
- 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 minion. Appears in "Casting the Runes."
A spirit that can possess machinery. The 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.
The main antagonist of "Home is Where the Horror Is."
- Bilingual Bonus: Le Maison means "the house" in French.
- Evil Old Folks: In human form.
- Faux Affably Evil: Its old woman form—so polite when inviting guests inside before springing the trap.
- 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.
- Your Soul Is Mine: Its victims' souls remain trapped inside even after their bodies are consumed.
The main antagonists of "Killjoys."
- Emotion Eater: They feed on people who laugh.
- Monster Clown: They are demons who 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.
- Viral Transformation: One of the clowns infects Eduardo, who then turns into one of them.
An ancient spirit that stole the eyes of anyone who gazed upon its orb. The 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 loses his own eyes and the ones he stole after gazing upon its own orb. It's then destroyed when the orb is smashed.
- Sealed Evil in a Can: Was trapped inside an orb.
- Teleporters and Transporters: Is easily able to move around in the blink of an eye.
- Voiced by: Fernando Escandon
- A Father to His Men: Literally. And he hopes to lead them into battle himself.
- Papa Wolf: Protective of not just his own children, but all bugs.
- 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 Kafka's The Metamorphosis.
- Voluntary Shapeshifting: Can shift between human and bug form at will.
- Voiced by: Roger Rees
- Belly Mouth: In his true form.
- Cut Lex Luthor a Check: Starts off this way, using his abilities to make money off the mayor.
- Disproportionate Retribution: Feeling stiffed by the Mayor, he intends to make every child in New York suffer.
- Humanoid Abomination: Until his true form is revealed, he looks indistinguishable from a normal human.
- One-Winged Angel: "Oh, you know my little secret? In that case, why don't I slip into something more comfortable?"
- Villain Ball: Mayor McShane was all set to honor his end of the deal, but Piper tried to force new demands after the job was done.
- Would Hurt a Child: He attempts to drown New York's children when the mayor refuses to give in to his demands.
The Salesman / Duophanes
- Voiced by: Jonathan Harris
- Be Careful What You Wish For: The title spells it out for you, after all.
- Blatant Lies: "Satisfaction guaranteed."
- Body Horror: Many of his victims end up transformed in some way, like a man who wanted to get in touch with his roots being turned into a tree.
- Clipped-Wing Angel: The Logic Bomb forces him to transform, and he's much more vulnerable this way.
- Faux Affably Evil: He's so polite and unassuming... before tormenting his victims.
- Humanoid Abomination: Like the show's other villains, he looks like a normal human for most of the episode. It ends up acting as a shield against the proton blasts, so the EGB need to get him to reveal his true form.
- Jackass Genie: He knows exactly what his victims want, but twists the meanings of the wishes for his own sadistic pleasure.
- Literal Genie: Granted people's wishes in the literal sense. The results weren't pretty.
- Logic Bomb: How he's defeated. Eduardo writes out a message about wishing that he doesn't grant a wish. After Kylie says it, the confusing nature of the paradoxical wish causes the Salesman to reveal his true form and become easy to trap.
- Ticking Clock: The EGB have to stop him from leaving town or else all the wishes remain permanent.
The Jersey Devil
The main antagonist of "The Jersey Devil Made Me Do It."
Dry Spell ghost
The main antagonist of "Dry Spell."
- Voiced by: Mary Kay Bergman
- Dark Is Evil: She wears black and is obviously a villain.
- Raven Hair, Ivory Skin: When she looks more human.
- Evil Is Hammy: Even when not using her scream power, she has No Indoor Voice.
- Evil Wears Black: Banshee wears an all-black ensemble and is VERY bad news.
- Hot-Blooded: She 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: 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.
- Even Evil Has Standards: She steals people's youth for her sister, but she can't bring herself to actually kill.
- Hair of Gold, Heart of Gold: Syren has blond hair, and she's shown to be very sweet and kind.
- Heroic Sacrifice: Willingly lets herself be trapped in order to undo the harm she had caused.
- 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
- Blow You Away: Demonstrates this ability a few times.
- Evil Gloating:Tempus: Congratulations, Professor Spengler, you get to bear witness to the beginning of the end of humankind!
- Evil Overlord: In the Bad Future.
- Flight: Showed this ability.
- Playing with Fire: Could throw fireballs.
- Take Over the World: His Evil Plan is to open the Containment Unit and begin "the Great Spirit Uprising."
HarasvelgThe main antagonist of "Bird of Prey."
- Blow You Away: Primarily uses its wings to create wind-based attacks.
- Bowdlerize: Has the meaning of its name from "corpse swallower" to the more child-friendly "Bird of Prey".
- Breath Weapon: Demonstrates its possession of this numerous times.
- Giant Flyer: The Harasvelg is a giant, bird-like creature.
- Our Dragons Are Different: Is referred to as a dragon but looks very bird-like. To say nothing of its ability to control the weather.
- Sadly Mythtaken: In Norse Mythology, Hraesvelg is a giant in the shape of an eagle whose name means "corpse swallower" and whose wing-beats cause the wind to blow. In the show, Hraesvelg is a dragon whose name quote "Literally translates from Old Norse as 'Bird of Prey'" and who has complete control over the weather.
ShanbahacThe main antagonist of "Seeds of Destruction."
- Gaia's Vengeance: He possesses plants and uses them to attack people. Kylie muses he's exacting revenge for deforestation, but Garrett quips he's just angry about people having one too many salads.
- Super Strength: Can rip through just about any material with minimal toruble.
LeprechaunThe main antagonist of "Luck of the Irish."
- Pint-Sized Powerhouse: He's able to physically knock around the EGB despite his short stature.
- Sealed Evil in a Can: Thanks to a band of humans, one of whom was Mayor McShane's ancestor.
- Sins of Our Fathers: Seeks revenge on the descendants of those who imprisoned him in the first place.
- Super Strength: Surprisingly so.
- Teleport Spam: Blink or look away, and he's gone.
- Teleporters and Transporters: One of his main abilities is to teleport anywhere he likes.
- Voiced by: Glenn Shadix
- Shock and Awe: He tortures Garrett's soul with this ability, Palpatine-style.
- Your Soul Is Mine: His ultimate goal with the souls his Mooks pushed out their bodies.
GhostmakersThe Mooks 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.
- Impostor Forgot One Detail: Eduardo's impostor is constantly polite, gets along with Slimer, and likes mayonnaise. Slimer's impostor doesn't want to eat anything. Garrett's impostor walks.
- Spot the Imposter: Slimer notices the strange behavior of "Eduardo" and is quickly replaced. Garrett notices the strange behavior from both afterwards and is ignored until he's replaced.
- Super Strength: Once they possess a body, they augment a person's natural strength.
FenrisAppears in "Slimer's Sacrifice."
- Animalistic Abomination: He resembles a very large wolf with pointy feet.
- Flight: Despite being a wolf, has this ability.
- An Ice Person: Breathes ice.
- Super Strength: Can rip through just about anything in his way.
SurtThe main antagonist of "Slimer's Sacrifice."
- Cold-Blooded Torture: What he wants to inflict on Slimer. For starters, he has him brainwashed into trying to kill Eduardo.
- Creepy Monotone: Surt speaks in a quiet and eerie voice.
- Dimension Lord: Rules the dimension inside the Containment Unit.
- Hoist by His Own Petard: His attempt to escape is foiled by Kylie sending Fenris into his path. Fire and ice make a bad combination.
- Playing with Fire: He can project flames.
- Remember the New Guy: It's been debated. Egon mentioned having caught Surt years ago with the original team—an event never depicted on the original show. On the other hand, there's wiggle room to say it was simply after the original show's last episode.
- Sealed Evil in a Can: He was trapped inside the Containment Unit by the original Ghostbusters years ago.
- Suspiciously Similar Substitute: Has a fair amount in common with Samhain, being the guy who commands other ghosts. He also really despises Slimer.
- Wrong Genre Savvy: He muses that Slimer's in the Containment Unit because the Ghostbusters simply tired of him.
- Xanatos Gambit: Attempts to pull one once he learns of Eduardo's presence. If the door is opened, he and the other ghosts can escape. If the door remains closed, he gets to kill Eduardo and torture Slimer. The door is eventually opened, but not long enough for him to enjoy it.
The GrundelThe main antagonist of "Grundelesque."
- Adult Fear: A tall creature in a coat who kidnaps your children and manipulates them into being bad."Come out and play."
- Arch-Enemy: To Kylie.
- Body Horror: His victims are transformed into Grundels like him.
- But for Me, It Was Tuesday: Averted.The Grundel: This is personal, isn't it? Why are you so interested in me, hmm?
Kyle: I... I don't know.
The Grundel: I do... Kylie.
- The Corrupter: To Kylie's friend Jack.
- Evil Sounds Deep: Speaks in a deep, creepy voice.
- Faux Affably Evil: He really turns on the charm for Kylie and refers to Egon as like an old friend, but he's a monster.
- Last of His Kind: Thought to be the last Grundel ever until Jack resurfaced.
- Leaning on the Fourth Wall: Egon says he and the original team busted him ten years ago. "The Grundel" aired in 1987 and "Grundelesque" in 1997.
- Pragmatic Villainy: The Grundel wanted Kylie, but she was too good a kid, so he settled for Jack.
- Sealed Evil in a Can: In the Containment Unit itself. He gets out briefly before being sent back.
- Sequel Episode: To "The Grundel" from the original series.
- Spanner in the Works: He always intended to come back for Jack later, but the RGB busted him soon afterwards.
JackAppears in "Grundelesque."
- Anti-Villain: Thanks to Baleful Polymorph; he wasn't originally evil.
- Body Horror: A normal boy transformed into a Grundel.
- Brainwashed and Crazy: A result of being transformed.
- The Dragon: To the original Grundel, who calls him his disciple.
- Dragon Ascendant: For most of the episode. The original's locked up, so Jack just goes about his business. Once the original gets out, though, Jack defers to him.
- Evil Former Friend: To Kylie.
- No Ontological Inertia: Played with. One of the show's rare aversions, he was not returned to normal when the original Grundel was busted because he was in a cocoon. Busting the original in the episode proper does return him to normal, though.
- Sealed Evil in a Can: He was left to gestate in a cocoon inside a tree. A lightning strike ended up releasing him.
MorpheusThe main antagonist of "In Your Dreams."
- Clipped-Wing Angel: He was virtually unstoppable so long as he was in people's dreams or possessing the radio host. Once he fully crossed over, though, he was easily foiled.
- 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)The main antagonist of "Fallout."
Gu MoThe main antagonist of "Eyes of a Dragon."
- Grand Theft Me: He possesses the body of the main guest character's father.
- Sealed Evil in a Can: He was imprisoned inside a golden dragon statue until it was destroyed.
Ghost BrideThe main antagonist of "Till Death Do Us Start."
- Humanoid Abomination: Appears to be human when she first appears, but then changes into a skinless form.
- Life Drinker: Not for herself, but she nonetheless attempts it.
- Mirror Scare: She can travel through mirrors, so this happens a fair number of times.
- Sealed Evil in a Can: Subverted. It appears to simply be a ghost of a dead woman that was trapped in a well, but she's actually freshly created by the Wishgiver.
- Yandere: To poor Leonard Bates.
WishgiverThe force behind the main antagonist of "Till Death Do Us Start."
- Be Careful What You Wish For: The ex-yuppie wished for a wife. The Wishgiver gave him a monstrous one.
- Jackass Genie: Considered one as it grants wishes in the worst possible way.
- Life Drinker: Through the granted wishes, it tries to absorb the life force of the given target.
- Sealed Evil in a Can: It lives in the wishing well by choice, as it's the best way to get people to make wishes. However, at some point, the well was closed off in a shed and forgotten about. It wasn't until Leonard moved in that a wish was finally made.
- The Man Behind the Man: The Ghost Bride is basically an extension of it. That's why a new bride appears the moment the original is trapped.
RavanaThe main antagonist of "Glutton for Punishment."
- 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 GhostThe main antagonist of "Ghost in the Machine."
- Sealed Evil in a Can: Laid dormant until oil drillers disturbed it.
Demi-DogThe main antagonist of "Dog Days"
- Animalistic Abomination: Resembles a giant dog.
The MistressThe owner of the main antagonist of "Dog Days"
- 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 DemonsThe main antagonists of "Mole People"
- Sealed Evil in a Can: Legends about them go back to humanity's early days. Egon muses that the Ice Age sent them into hibernation and that they've only recently been awakened.
- Your Soul Is Mine: Once fully charged, they'll be able to steal people's souls.
LilithThe main antagonist of "A Temporary Insanity"
- The Chessmaster: Provides an unappreciated Janine with a possible vacation, ensuring the team will need an intern stat. She sneaks her phony agency's contact number into Eduardo's belongings, too.
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.
- Not Quite Dead: All the people that it absorbed turned out to be alive. They're set free once the two teams bust it.
SphinxThe main antagonist of "The Sphinx."
- Sadly Mythtaken: He is meant to be based on the Greek Sphinx, but wears Egyptian regalia.
- Sore Loser: The Sphinx obviously gloats when no one was able to solve his riddle. However, when Egon correctly answers, he immediately demands to ask another one.
- Villainous Breakdown: He completely loses it when Egon correctly answers his riddle.
- Voiced by: Ron Feinberg
- The Corrupter: To the three witches.
- Evil Sounds Deep: In his One-Winged Angel form.
- Gods Need Prayer Badly: He needed four believers in order to gain power.
- Humanoid Abomination: His eyes are shaped like diamonds!
- One-Winged Angel: Assumes a demonic appearance near the end of his episode.
- Villainous Breakdown: When Cernunnos is getting pulled into the ghost trap, he desperately tried to get free by tempting them more power if they let him go. This time, no one listens.
- You Have Outlived Your Usefulness: Once the three witches release him, he turns them into grotesque creatures, stating they've served their purpose.
- 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 insists the whole thing was a publicity stunt the St. Patrick's Day Parade and takes full credit for it.
- Entitled Bastard: He and his buddies knocked down Garrett from his wheelchair, calling him a killjoy when he objected to their racist vandalism on a Jewish Temple. When they get chased down by the golem, Spencer begs Garrett to save them, prompting him to ask "oh really now?" Eduardo suggests letting the golem wail on Spencer a bit before intervening, then Kylie quickly reminds them that although she shares the sentiment, they're supposed to be the good guys.
- Evil Former Friend: To Garrett.
- 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."
- No Celebrities Were Harmed: He's modeled after several prominent horror writers, including Clive Barker and R.L. Stine. He also looks like an older, balder Stephen King.
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
- Deader Than Dead: He was already dead to start with, so he's this in the end.
- Expy: Of Captain Ahab.
- Heroic Sacrifice: Is destroyed taking down Lotan.
- Hunter of Monsters: He hunts Lotan.
- In Universe Nickname: Garrett gives her the nickname "Stef."
- Love Interest: For Garrett.
- She Cleans Up Nicely: Once Janine helps her dress for going out above ground, she proves to be quite pretty.
- 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.
Wanda, Celina, and Bess
- Body Horror: After Eduardo completes their circle and Cernunnos manifests in our reality.
- Blonde, Brunette, Redhead: Wanda, Celina, and Bess respectively.
- Brought Down to Normal: The witches lose their power once Cernunnos is captured.
- Deal with the Devil: They make one with Cernunnos in "Witchy Woman."
- Disproportionate Retribution: Wanda and Celina revel in this. Bess thinks it goes too far. Such as turning the lead cheerleader into an ugly troll and a jock into a human tree.
- I Just Want to Be Loved: Bess's motive for wanting power was to get noticed, but would always be turned away. Wanda and Celina use the rejections as excuses to use their powers on others.
- Token Good Teammate: Bess is the kinder of the three witches. All she wanted was to fit in.
Carl RiveraEduardo's older brother who views the Ghostbusters with disdain.
- Do Not Call Me "Paul": Carl would angrily correct Eduardo his name is Carl when he addresses him as Carlos.
- Entitled Bastard: He angrily tells Eduardo and the Ghostbusters to stay out of "police business" when a pack of trolls invade a bridge, believing he and the police can handle it. When it became apparent the police were completely in over their heads, Carl then demands if the Ghostbusters can do anything about them, prompting Eduardo to call him out on his demand moments after telling them all to get lost.
- Overprotective Dad: To his son, Kevin. He also believes Eduardo will be a bad influence on him.
- Sibling Yin-Yang: While Eduardo is skinny and laid-back, Carl is built and serious.
- Ungrateful Bastard: Despite the Ghostbusters stopping the trolls and saving his son, Carl was still expecting Eduardo to tell Kevin that the Ghostbusters are not heroes. Eduardo throws it back in his face by saying that he's proud to be a Ghostbuster.