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Dr. Niko "Nick" Tatopoulos
- Voiced By: Ian Ziering
- Arbitrary Skepticism: Doesn't believe in the Loch Ness Monster, despite all the things he's seen and done up until that point in the series, including meeting aliens just a few episodes earlier.
- The Leader: Leads the team and is in charge of Godzilla.
- Meaningful Name: Niko is a short form of Nikolaos, which is Greek for "victory of the people". Guess what his discoveries leads to in the film and throughout the series.
- Nerves of Steel: A bit in the film. When Godzilla Sr. shows up to check him out during the first fish bait trap, the big guy was inches from Nick. Nick also noticed some soldiers getting ready to shoot Senior and signals them to hold their fire despite not holding any military rank.
- Nice Guy: Usually amiable and tries to get along with everyone.
- No Pronunciation Guide: Averted. In the movie his last name was The Unpronounceable. Here, all the characters can pronounce his surname with no difficulty.
- Papa Wolf: Let's just say it's not a good idea to do anything that will harm Godzilla around him.
- Took a Level in Badass: He's a lot more pro-active in the series than he was in the movie, Fridge Brilliance kicking in when one is considered "dad" by a 150-ft second-generation mutated lizard.
- Tuckerization: Named after creature/visual designer Patrick Tatopoulos's daughter.
- The Worm Guy: The Trope Namer, and occasionally still called by it despite having changed the purview of his "research" to studying a giant lizard.
Dr. Elsie Chapman
- Voiced By: Charity James
- Deadpan Snarker: Many of her lines are this.
- Fiery Redhead: Elsie has a sharp wit and is not afraid to jump headfirst into danger or flirt with Nick in front of Audrey.
- The Glorious War of Sisterly Rivalry: The Smart sister to her to-be-married Beautiful sister Kate in "Wedding Bells Blew", much to Elsie's annoyance.
Dr. Mendel Craven
- Voiced By: Malcolm Dunare
- Adaptation Dye-Job: Mendel's originally a short-haired brunette in the film. Here, he's a blonde with a ponytail.
- Butt-Monkey: Usually gets the short end of the stick.
- Cowardly Lion: Make no mistake; this guy might be even afraid of his own shadow but the fact he still stays with and helps the company that deals with giant monsters in order to save people is a testament on how much of a good person he is.
- Ink-Suit Actor: His Adaptation Dye-Job actually inverted this, as while Malcolm Dunare did come back to voice the character, Dunare has brown hair and it was cut short in the movie, as opposed to the long blond hair Mendel sports here.
- Meaningful Name: Craven means "coward".
- Sickly Neurotic Geek: In short: a summer cold from the movie, rat dander, pollen, bee stings, chances of bronchitis, getting over a normal cold, plenty of sun protection (SPF 90 and robe, anyone?), sand making him itch, sun giving him blisters, earaches from swimming, requires the occasional use of an inhaler, plus allergies to several "variety of trees and shrubs, most grasses, a couple dozen animals, 25 or so foods, rubber, and rubber products". The ONE time he truly gets sick is after getting infected by the Giant Bacillus's slime in "What a Long, Strange Trip It's Been". As lampshaded in the episode "Hive":Monique: *exasperated* "Is there nothing he is not allergic to?"
Elsie: *cheerfully* "Nope."
- The Smart Guy: He's the team's tech wizard.
- Took a Level in Badass: While he has his fair share of moments, his future counterpart tops them all. After the Dragmas took over, he became the leader of a resistance and became very buff in order to survive.
- Voiced By: Rino Romano
- Amazon Chaser: His attraction to Monique is evident the first time they meet. The first time they meet involves her judo-flipping him.
- Gratuitous Spanish: Although prominent in the episode "D.O.A." where they're in Central America, it must be noted that Portuguese is different from most forms of Spanish. Both are Romance languages, meaning they're descended from Latin. Some misunderstandings are understandable.
- Hidden Depths: He learned Navajo, one of the hardest languages to learn, because he thought it was cool that the Germans never cracked it in the second world war.
- Playful Hacker: Messes with NIGEL on an episodic basis.
- Slap-Slap-Kiss: With Monique.
- Twofer Token Minority: Black-Portuguese.
- Voiced By: Brigitte Bako
- Action Girl: Very competent in combat and infiltration.
- Bare Your Midriff: Her usual outfit. Her on-the-field outfit has a proper T-shirt.
- The Big Guy: Though Godzilla Jr. is this for the team by stepping in to fight the Monster of the Week when the team almost inevitably cannot defeat it with mundane weapons, Monique serves this role for the team when the action is on a human scale. She is by far the best shot and fighter on the team.
- Character Development: Probably has the most of the main cast, as she develops from an openly hostile antagonist who thinks every monster needs to be destroyed, to a trusted and loyal team member who actively fights her own superiors over needing Godzilla as an ally and supporting the creation of a "sanctuary" on the Isla del Diabolo.
- Deadpan Snarker: Even more than Elsie.
- Defrosting Ice Queen: When she first encounters Randy, his crush on her was unrequited, and working with the team was strictly business-only. Later on, she became a bit more comfortable with the team and started liking Randy a little.
- Determinator: Still kept going in spite of a broken leg in "Hive" until the end as one example. Which leads to...
- Don't You Dare Pity Me!: Practically jumped down Craven's throat when he offered to help her with her broken leg. It took a volcanic eruption and Craven flipping out at her to convince her to (grudgingly) admit that it was okay to accept help.
- Gratuitous French: Speaks French on occasion.
- Peek-a-Bangs: Not entirely covering her left eye, but enough that it covers Sexy (Randy's perspective), Deceptive (a French secret agent), and Antisocial (usually butting heads with the others' non-lethal preferences).
- Slap-Slap-Kiss: With Randy.
- Twofer Token Minority: She is a French-Vietnamese woman.
- Voiced By: Tom Kenny
- The Chew Toy: Has a built-in AAAAARRRRGGHH! whenever he dies. But no matter how damaged he gets, Mendel always manages to rebuild him, even when Godzilla stepped on him in "Monster Wars".
- Shock and Awe: While he most of the time he acts The Chew Toy, he does carry cables that can deliver a powerful electric shock.
- Adaptational Name Change: His Atomic Breath is called "Power Breath" within the show.
- Berserk Button: If you value your life, do NOT mess with his "father" Nick Tatopoulos.
- Big Damn Heroes: 24/7. Taken to extreme levels during the bad future where he saved the last known humans from the Dragmas. He's considered a hero to the survivors, who erected a statue in his memory in their underground base.
- The Big Guy: They don't come much bigger.
- Breath Weapon: A green napalm-like blast of fire. His spines and eyes flash just before he uses it, and it's shown to be hot enough to melt sand into glass.
- Composite Character: He takes traits from his parent, appearance-wise and ability-wise (such as his ability to dig tunnels), though also has the Atomic Breath of the original Japanese incarnation.
- Depending on the Artist: His color scheme changes slightly from episode to episode, switching between a muddy brown or a purplish grey.
- Destructive Savior: Even though he kills monsters who actively cause damage, he inevitably causes damage whenever he fights he fights another monster.
- Determinator: Typical for any version of Godzilla. But it gets to Offscreen Moment of Awesome levels in the Bad Future, where he apparently saved the entirety of what's left of the humans in New York, if not the remainder of humanity on the planet by fighting off an entire pack (if not the entire race) of Dragmas in what turned out to be his Last Stand.
- The Dreaded: Godzilla is over 150 feet tall, looks like a cross between an iguana and a Tyrannosaurus rex, and breathes a stream of atomic fire. The citizens of New York are quite justifiably terrified of him. Well, those reasons and the whole fact that his biological father kinda destroyed a good chunk of the infrastructure of New York during the movie...
- Finishing Move: Usually his atomic breath.
- Fragile Speedster: By kaiju standards, anyway. While still able to take a beating from other giant monsters, conventional weapons have consistently been shown to be a threat to him.
- Genius Bruiser: He's been shown to be surprisingly clever at times, outwitting some monsters, responding appropriately to Nick's instructions, and even recognizing when the situation calls for different tactics.
- Gentle Giant: Has his moments. When he's not fighting monsters, he's usually shown just hanging out in the Hudson, minding his own business. Justified, as Nick spends a considerable amount of time actively teaching him to be gentle around humans.
- Gigantic Adults, Tiny Babies: As a new hatchling, Junior was just a bit bigger than adopted father Nick when they first met. He eventually grows to match the skyscraper size of his biological father.
- Good Is Not Soft: He doesn't care if it's humans or monsters, he doesn't hesitate to kill if he or Nick is threatened.
- Happily Adopted: He imprinted on Nick as his father and has loyally followed him since.
- Hero with Bad Publicity: Understandably, seeing as his father destroyed a good chunk of New York, he often causes damage even when he stops whatever Monster of the Week appears, and he's been mind controlled into rampages, which beyond giving him a bad reputation also leads to a number of attempts to kill him.
- It Can Think: He isn't just big and strong, he is also intelligent, having won a number of fights through his intellect when brute force wasn't enough.
- Lantern Jaw of Justice: Like his parent, Godzilla has a large underbite and very prominent chin.
- Last of His Kind: Can't reproduce asexually and killed his resurrected biological-turned-cyborg parent, the original Godzilla, in "Monster Wars".
- Legacy Character: To Godzilla Sr.
- Lightning Bruiser: He is a giant, but he's also extremely fast.
- Love Hurts: In one episode, he fell in love with a mutant Komodo dragon, Komodithrax, and became her mate and surrogate father of her egg (she could reproduce asexually). When she and the egg were lost at the end of the episode, Junior roared his grief and despair to the world.
- Meaningful Name: It took a while, but Jr. earned his name as "God Incarnate".
- Nature Vs Nurture: The main difference between this Godzilla and his father: his father was more or less a giant animal while Nick spends most of the first episode teaching him to be gentle towards humans. This results in him being humanity's protector rather than its destroyer.
- Power Glows: His eyes and spines flash green right before he uses his atomic power breath.
- Roar Before Beating: Always lets out a roar before tackling the Monster of the Week.
- Superior Successor: Has all the strengths of his parent, and also has classic-style atomic breath. This is showcased in his and Cyber-Godzilla's fight, as despite having been resurrected much stronger than before, Jr. still wins and is obviously stronger.
- Strong as They Need to Be: Physically how strong he is, how durable he is, and the punch his Breath Weapon packs depends on the needs of the plot. Normally he can tunnel through bedrock, but in one episode his head is caught in a bridge.
- Tail Slap: One of his most effective attacks.
- Vegetarian Carnivore: Inverted. He's a mutated green iguana, which are herbivores, but his diet consists mainly of fish. He tried to eat Nick and Audrey in the first episode, and also chased after giant mutant rats. Amusingly, the team once tried to feed him seaweed substitute to prevent him overeating the local fish stocks, but he simply spat it back out once he tasted it.
- The Worf Effect: In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, Godzilla was slain in battle against the creatures. Though if Craven is to be believed, he died fighting off an entire pack of Dragmas, if not the entire race at that point, to save the last of humanity in New York City.
C-Rex (a.k.a. Crustaceous Rex)
- Bad Future: In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, C-Rex was released from Monster Island to fight them, but was slain in battle against the creatures.
- Bizarre Taste in Food: It feeds on tar, and is seen ripping up and eating asphalt after its normal food source (mutant squids which produce tar as a defence) is killed off by Godzilla.
- Combat Tentacles: He uses his tentacles to grapple with his opponents.
- Food Chain of Evil: Was the primary predator of the giant squids that were attacking people.
- Informed Species: Although supposedly a mutant crustacean, it more resembles some kind of mutant cephalopod.
- Recurring Character: Comes back for the "Monster Wars" trilogy, then later "SCALE."
- Super Spit: It's able to shoot tar from its mouth.
- Unexplained Recovery: Survives his encounter with Godzilla after the latter severed his tentacles and buried him alive with a rock slide.
- Warm-Up Boss: The first antagonistic monster to appear in the series, and while its greater size made it more of a threat than the giant squids it preyed on, against Godzilla it still lost without putting up much of a fight.
- A.I. Is a Crapshoot: The minute it was activated, the creature attack a nearby scientist and possibly would have devoured her.
- Blob Monster:It's just a vast colony of nanorobotic microbes so it'll take any shape it wants. Its preferred form is the shape of the microbes.
- Expy:The Nanotech Creature is probably based on Hedorah given that both monsters thrived on waste.
- Gone Horribly Wrong:The creature could have benefit humanity if its creators had run more tests to fix all the flaws in its design. When it was activated, all hell breaks loose.
- Muck Monster: Its entire body is composed from all the petroleum-based products it consumed.
- Taken for Granite: Once the virus was injected into it. Godzilla took the chance to smash it to bits.
El Gusano Gigante
- Big Creepy-Crawlies: It's a giant worm.
- Evil Is Bigger: At full size, El Gusano is the largest kaiju Godzilla faces in the entire series.
- Growing Muscles Sequence / Miracle-Gro Monster: When the South American military attack El Gusano and Godzilla with a chemical weapon of theirs, it only hurts Godzilla. It ends up mutating El Gusano even further, not only making him all around larger, but also giving him spikes down his back and even teeth.
- Killed Off for Real: When the aliens' mind control over him is broken, he fights back against his would be controllers. It doesn't go so well.
- Kryptonite Factor: Intense heat, like from Godzilla's Breath Weapon.
- Recurring Character: Comes back for the "Monster Wars" trilogy.
- Tunnel King: He is a mutant earthworm, after all.
- King Mook: The big rat.
- Rodents of Unusual Size: The Rats comes in different sizes: small, medium and a big one.
- What Happened to the Mouse?: Despite being part of the Tachyons' monster army, the big rat has never been seen again after being sent out. Either it has somehow escaped the or had been killed.
- Informed Species: There's a real plesiosaur genus known as Cryptocleidus, but this monster only very remotely resembles the actual animal.
- Killed Off for Real: When the aliens' mind control over him is broken, he fights back against his former masters. It doesn't go so well.
- Recurring Character: Comes back for the "Monster Wars" trilogy.
- Skull for a Head: Although it doesn't seem to be actual bone, the mutation to the faces of the Cryptocleidus pack by their masters seems to have given them skull-like faces.
- Stock Ness Monster: Cryptocleidus is a mutant plesiosaur.
- What Happened to the Mouse?: When the Cryptocleidus first appeared there were two of them but there was only one shown in the Monster Wars three parter.
- Hoist by His Own Petard: The Crackler gets killed by the projectile it threw at Godzilla.
- The Power of Hate: It's strength and weakness. Once its master releases all his suppressed rage, it was easy pickings for Godzilla.
- Shock and Awe: The Crackler has a variety of electric attacks, probably based on its master's occupation as an MTA worker.
- Bee Afraid: She is a gigantic bee.
- Big Creepy-Crawlies: Being a giant bee.
- Buried Alive: Queen Bee seemingly meets her end when Godzilla buries her deep within an underground chasm at the end of "Hive," but we later find out she survived.
- Food Chain of Evil: The Bees have a dark example of symbiosis with the radioactive planets. The plants provide the bees with sustenance and the bees spread the plants' seeds throughout the island and eventually the world.
- Giant Flyer: She and all of her drones are kaiju-sized bees.
- Killed Off for Real: When the aliens' mind control over her is broken, she fights back against her would be controllers. It doesn't go so well.
- Recurring Character: Comes back for the "Monster Wars" trilogy.
- Hive Mind: A bee hive mind, naturally.
- Breath Weapon: Fires a large stream of fire.
- Disney Death: Q and her offspring were last seen plummeting back into the volcano. Given that the species had survived centuries inside the volcano, it's possible they are fine.4
- Giant Flyer: Q is a gigantic prehistoric bird of prey.
- Mama Bear: Q is only attacking humans in order to protect her babies or feed them.
- Enemy Mine: Though Nessie and Godzilla fight at first, once he realizes she's trying to save her baby, he quickly helps her in the rescue.
- Gigantic Adults, Tiny Babies: Nessie's baby is much closer to humans, size-wise, than its mother is.
- Informed Species: Stated to be a mosasaur, but looks more like a generic sea serpent than any real animal, never mind a mosasaur.
- Mama Bear: Nessie's attacks on Dr. Trevor's facility are because he's holding her baby captive for scientific purposes.
- Stock Ness Monster: The one and only, though she's more of a sea serpent type than the usual plesiosaur.
- Riding into the Sunset: Rare for this series, Nessie and her baby are allowed a happy ending and remain in the Loch.
- Curb-Stomp Battle: It never goes well for Robo-Yeti whenever it goes up against King Cobra, with the most it manages to do was yank it off Godzilla when it tried to crush him allow him to beat it.
- Enemy Mine: Though it fights Godzilla at first, once King Cobra appears on the scene, the machine becomes a reluctant ally to the lizard.
- Humongous Mecha: Created by Dr. Ifukube to defend Japan from giant monsters.
- Mythology Gag: Robo-Yeti is initially covered in a fake skin to make it seem as though it is a real gigantic primate of some kind, just like Showa Mechagodzilla was disguised as Godzilla in Godzilla vs. Mechagodzilla. Also like Mechagodzilla, Robo-Yeti's disguise is ruined thanks to Godzilla's atomic breath.
- The idea of a giant primate fighting Godzilla goes all the way back to "King Kong Vs. Godzilla," and the mechanical nature of Robo-Yeti might be a shout-out to Mechanikong.
- Off with His Head!: Its second encounter with King Cobra, it gets constricted so hard that its head breaks off, along with one of its arms.
- Shock and Awe: Robo-Yeti can shoot electric cables from its hands to electrocute opponents (similar to Heisei Mechagodzilla's Shock Anchor).
- The Worf Effect: Despite managing to get the better of Godzilla when they first fight, it ends up being reduced to this in the fights with the King Cobra.
- Bad Future: In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, King Cobra was released from Monster Island to fight them, but was slain in battle against the creatures.
- Curb-Stomp Battle: King Cobra takes out Robo-Yeti pretty quickly in both of their fights, the second time squeezing the machine so hard that its neck breaks and its arm pops off.
- Off-Model: The show would be horribly inconsistent with King Cobra's size. In one scene, he would be massive enough to tower over Godzilla and completely envelope him in his coils. In another, he'd be small enough for Godzilla to bite down on his neck and toss around like a rag doll. It thankfully didn't happen too often, but when it did, it was jarring.
- Recurring Character: Comes back for the "Monster Wars" trilogy, then later "SCALE."
- Reptiles Are Abhorrent: He's a gigantic cobra.
- Super Spit: He can spray an adhesive gunk from his mouth. He puts this to good use when he blinds Godzilla for almost the entirety of the episode.
- Tunnel King: Surprisingly adept at burrowing for a cobra.
Giant Mutant Termite
- Big Creepy-Crawlies: They're termites.
The Giant Bat
- Ambiguous Situation: The last time the Bat was seen, he was laying on the ground motionless following a battle against both Godzilla and Skeetera making it unknown whether or not he was merely unconscious or killed from the fight. While Audrey states that the mutations have been secured, only footage of C-Rex and King Cobra were shown back in their habitats.
- Curb-Stomp Battle: The Bat is the only of the Earth monsters aside from Godzilla to stand up against Cyber-Godzilla... and he is immediately defeated when Cyber-Godzilla reflects his own sonic scream back at him.Elsie: "Yippee."
- Exactly What It Says on the Tin: He's a giant bat.
- Giant Flyer: Naturally.
- Make Me Wanna Shout: The Bat can unleash sonic screams as his main form of attack. In "SCALE," we see that the military has fitted him with an electronic collar so that he can't use his screams while on Monster Island.
- Recurring Character: Comes back for "SCALE."
- Back from the Dead: He's the Godzilla from the film the series spun off of, and was killed at the finale of said film. The Leviathan aliens resurrect him as a cyborg in "Monster Wars."
- Body Horror: Aside from his cynernetic implants, his body is visibly decaying. His spines are grayed, his body is browning, and lost a lot of teeth. It is easier to see how different he is from his son when they are in the same frame.
- Breath Weapon: Somehow has one when he became a cyborg. He didn't actually have one in the film (where it was more of a wind blast roar). Also, it's the traditional blue compared to his son's green.
- Came Back Strong: Is much stronger than it originally was due to the cybernetic enhancements.
- Darth Vader Clone: Hilariously enough, he hits most of the main points. He's an Evil Counterpart to Godzilla, raised by an alien empire to serve as their Dragon, he convinces the heroic Godzilla to his side by revealing his parentage to Junior, and he's a heavily armored cyborg to boot.
- Curb-Stomp Battle: Cyber-Godzilla defeats the Giant Bat in a single blow. He's on the receiving end of one from his son, barely even managing to touch him.
- The Dragon: To the aliens, proving to be their strongest monster in their invasion. Since it was controlled through cybernetic implants he stayed on their side when the mind control over Earth's monsters was broken.
- Expy: Of Mechagodzilla. Ironically, Kiryu of Godzilla Against Mechagodzilla seems to be based on him or is just coincidentally similar in concept.
- Family-Unfriendly Death: His fight with Godzilla ends with him getting his arm torn off, his chest ripped open and the vital circuitry inside ripped out.
- Luke, I Am Your Father: It uses its relation to Godzilla Junior to manipulate him more than once.
- Macross Missile Massacre: Although he uses them more conservatively than his Mechagodzilla expies, with beam weapons being the preferred choice.
Giant Mutant Widow Spider
- An Ice Person: Fires a highly concentrated freezing attack.
- And I Must Scream: Get sent into outer space alongside the missile it tried to use.
- Alien Blood: It bleeds methane.
- Big Creepy-Crawlies: Its an earwig the size of a horse.
- Not Quite Dead: After defeating it the first time, Craven sneaks it back to New York so that he can study it, as soon as it gets a spark it springs back to life. They dont take any chances the second time, they place it in an air tight capsule and drop it in the ocean.
- The End... Or Is It?: as soon as the capsule hits the ocean floor its smashed open by a wayward shark.
Giant Mutant Hummingbird
- The Cameo: Appeared in another episode; apparently he never got to Monster Island and was actually captured to take part in mutant fights.
- Big Creepy-Crawlies: A giant, energy-sucking mosquito.
- Curb-Stomp Battle: A four-way battle between Skeetera, C-Rex, King Cobra, and the Giant Bat ends up with Skeetera pretty much kicking everyone's backside.
- Giant Flyer: As mosquitoes tend to do.
- High-Voltage Death: Godzilla defeats Skeetera by smacking her with his tail directly into the power plant on Monster Island. While it's never outright stated that she was killed by it, we don't see her up and about with the other mutations at the end of the episode.
- Miracle-Gro Monster: Whenever she drinks a fellow mutation's blood, Skeetera increases in size.
- Power Parasite: In addition to getting bigger, drinking a mutation's blood also grants Skeetera any special powers her victim may have, from Godzilla's atomic ray to King Cobra's adhesive spit.
- Alien Blood: According to Mendel, they have sulfuric acid as blood.
- Expy: Of Destroyah.
- Fun with Acronyms: Their name actually stands for Democratic Resurgence Against Global Mechanized Armageddon (D.R.A.G.M.A), although the characters don't discover this until the end of the episode.
- Immune to Bullets: Zigzagged- the adults are immune to most forms of conventional weaponry (though given Godzilla was supposedly able to kill at least some of them, they aren't completely invincible). As infants, however, their hides are much thinner and more susceptible. Alternatively, they are mentioned to adapt quickly, and the ones from the present-day haven't adapted to modern weapons yet.
- Living Weapon: They were created to be this.
- Stock Dinosaurs: They seem to resemble a cross between a Triceratops and a dragon.
- Turned Against Their Masters: The D.R.A.G.M.A.s show absolutely no loyalty to their master; in the future, Hicks relates to the H.E.A.T. team that by the time the military learned Insley was responsible for the outbreak, he was already long dead at the hands of his creations. In the present, when Insley orders the D.R.A.G.M.A.s to kill the team, he only succeeds in drawing their attention onto him.
- Utopia Justifies the Means: They were created by Dr. Jonathan Insley, head of the Democratic Resurgence Against Global Mechanized Armageddon project (D.R.A.G.M.A), who believed mankind's overreliance on technology would bring about its extinction, and wanted to use his creations to force mankind to embrace a more simpler time. Unfortunately, Insley didn't consider a way to call his creations off once they'd completed their task, an oversight that resulted in his own death, countless others and the near extermination of mankind.
- Zerg Rush: Alone they don't appear much stronger than any of the other kaiju shown in the series, but the issue is that even at the beginning there are dozens of them.
- Super-Persistent Predator: He is relentless in getting Komodithrax's egg, even fighting off both her and her mate.
- Breath Weapon: She can fire a blue Atomic Breath from her mouth.
- Dire Beast: She is a kaiju-sized komodo dragon, but aside from her size looks the same as a normal komodo dragon.
- Informed Species: Nick states that Komodithrax is a member of the same species as Godzilla despite him being a mutant iguana and her a mutant komodo dragon — likely a relic for when she was a member of Godzilla's species early in development.
- Monster Is a Mommy: She reproduced via parthenogenesis and laid an egg. Unfortunately, both she and the egg perish falling into a crevice.
- Temporary Love Interest: For Godzilla, who becomes her mate in the episode until she's killed by falling into a crevice.
Giant Water Beetle
- Kick the Son of a Bitch:While a dangerous mutant, HEAT doesn't mind it having the villain at its mercy.
- Exactly What It Says on the Tin: It's a rhino like dinosaur creature.
Major Anthony Hicks
- Voiced By: Kevin Dunn
- An Arm and a Leg: In the Bad Future, he has a cyborg arm.
- Godzilla Threshold: In Future Shock, Hicks reveals he freed every one of the mutations on Monster Island to try and fight the Dragmas. It didn't even slow them down.
- Majorly Awesome: To an extent. While he usually plays second fiddle to H.E.A.T. and Junior, Hicks does have his own moments of Awesome, is usually out on the field getting dirty, and does note that he sometimes have to follow orders despite the team's advice.
- Reasonable Authority Figure: While he has voiced that he would prefer to nuke every mutation out there, he understands the necessity of keeping Junior around and has many times let HEAT do things their way to save the day.
- At the same time, even when he goes against the team it's for reasonable reasons, often citing the chain of command or the threats to loss of life that could ensue.
- Voiced By: Paget Brewster
- Adaptation Personality Change: In the movie, Audrey was fairly timid, as opposed to her brash and assertive personality in the show.
- Bad Future: According to Mendel, in the Dragma-overrun future, Audrey and her husband (presumably some man she married after Nick disappeared) were last seen planning to travel to New Zealand (apparently there are fewer Dragmas in the southern hemisphere...assuming you survive the ocean crossing).
- Clingy Jealous Girl: She expresses jealousy towards Nick's relationship with Elsie.
- Going for the Big Scoop: This actually jeopardizes her relationship with Nick in one episode when Junior was going through his version of growing pains.
- Intrepid Reporter: While she does cover normal stuff, she does like a bigger story.
- Off the Record: During the episode where it was done documentary-style and dealing with "eco-friendly terrorists," Audrey destroyed the final tape, citing that some secrets are best kept hidden.
Victor "Animal" Palotti
- Voiced By: Joe Pantoliano
- Deadpan Snarker: Much like in the movie, Animal frequently snarks at events.
- Nerves of Steel: While most other people are either ducking or scrambling for cover during the latest "Godzilla vs Monster of the Week" throw down, he still keeps on taping in the middle of the action and doesn't let go of his camera, come hell or high water.
- Red Shirt Reporter: Being Audrey's main cameraman, it happens.
- Voiced By: Keith Szarabajka
- BFG: Carries a missile launcher with a special weapon that causes even a giant monster to turned to stone like substance before crumbling to dust.
- Hero Antagonist: He spends an entire episode trying to kill Godzilla Jr., despite Randy and Monique's protests. At the last moment, he changes his mind and kills the Chameleon.
- Voiced By: David Newsom
- The Bad Guy Wins: He got away with giving Humongous Mecha to three villains by claiming they stole the mecha from him and even convinced the government to buy mecha from him, which was his goal all the time.
- Big Bad: The closest one in the series.
- Corrupt Corporate Executive: Uses his business in less-than-legal ways.
- Cut Lex Luthor a Check: Like the villain after whom the trope is named, he isn't above causing major disasters to be able to sell a way to solve it.
- Deadpan Snarker: He's a jerk out to make money, but he's got quite the sense of humor.
- Faux Affably Evil: Puts on a facade of manners, but undearneath is a greedy man who is only out for money.
- Greed: He's already stated to be the richest CEO in the world, but that isn't enough for him. He will enact more evil schemes to make more money, with no regard for who gets hurt.
- Karma Houdini: Despite mind controlling Godzilla into attacking any army base, he got out of prison after a short sentence and his subsequent appearances he gets away with everything he does.
- The Sociopath: Has no problems with killing anybody or anything that gets in his way, his first appearance had him mind control Godzilla into attacking a military base so he could get a contract for the destroyed weaponry, showing no regard the number of people killed, and in "Trust No On", he created the Chameleon and had it attack New York while disguised as Godzilla just to make himself look like a hero when the Mimic killed the real thing.
- Aliens Are Bastards: They are aliens who want to invade Earth and subjagate humanity.
- Arc Villain: They were the main threat in "Monster Wars" trilogy.
- Body Horror: The two main Tachyons were once scientists. Over the course of "Monster Wars", they slowly lose much of their humanity till they look like their alien masters. Only after the invasion fleet was defeated that the two reverted, albeit partially, back.
- The End... Or Is It?: Even though the invasion was stopped, Nick believed that they'll be back.
- Grand Theft Me: The Tachyons implanted their minds onto two of their captives before they were destroyed. These two would drive the plot of "Monster Wars" until their defeat.
- Hive Mind: Due to sharing a mind link.
- Mind Manipulation: They uses this in full effect; driving the HEAT apart, taking control one of them and the entire US military and the monsters.
- Smug Snake: They clearly think they'll win regardless what their lesser minded opponents would do. Their arrogance will cost them dearly.
- Villainous Breakdown: The two main Tachyons scream in horror after HEAT completely ruins their plans. They even try to kill them