Characters from the series.
Introduced in the Movies and specials
Susan Murphy (her monster nickname being "Ginormica") is a normal woman who is hit by a radioactive meteor on her wedding day, causing her to mutate and grow to a height of 49 feet 11 inches (15.21 m). Meek and unassertive, she just wants to return to her old life, but gradually warms up to her new status as a monster. In addition to her size, she is amazingly strong and has a resistance to energy attacks. She serves as the film's central character.
- Action Girl: Grows into one. She took down a robot and fought Gallaxhar.
- Attack of the 50-Foot Whatever: Susan is 49-feet-11-inches tall.
- Badass Adorable: She's an kind and adorkable young woman who, over the course of the movie, manages to take down a giant robot and eventually stop an alien invasion.
- Badass Normal: Despite having her quantonium taken from her during the climax of the movie, she took enough levels in badass to skate her way to the control deck and take on Gallaxhar himself, despite him being larger than her by that point and having a laser gun.
- Break the Cutie: She starts off happy with her life, only to lose it all on her wedding day to something out of her control, ends up scared and alone in a place she doesn't know and unable to call anyone, and finds out the man of her dreams doesn't actually care for her. Things do eventually perk up for her, but still.
- Brought Down to Normal: She loses her size and strength during the third act of the movie, courtesy of Gallaxhar draining the quantonium from her body.
- The Chick: The token female of the group as well as the main character.
- Cute Giant: Susan may be giant, but she's still an adorable woman.
- Cute Monster Girl: She's may be a giant, but she's still an attractive young woman.
- Dark-Skinned Blonde: Justified by the Magic Meteor that gave her powers shifting her hair from brown to white.
- Deconstruction: Susan is the stereoypical modern woman. About to get married, normal everyday name, loving parents, middle class lifestyle. Most of that goes out the window following her mutation, and the rest of the movie is based around her picking up the pieces. It becomes a Reconstruction, however, after she ultimately becomes a stronger person for it.
- Gentle Giant: She's 49 feet and 11 inches, and she's very nice.
- Giant Woman: Due to a meteor falling on her.
- The Heroine: The movie revolves around Susan embracing her monster status.
- I Just Want to Be Normal: For most of the movie, she mostly wants to return to her original size, leave the facility and get back to her normal life. She eventually grows to enjoy her new form, however.
- The Leader: Of Team Monster in the series.
- Locked into Strangeness: Her hair was originally brown but after getting hit by a Magic Meteor her hair turns white. When Gallaxhar temporarily shrinks her back to normal size in the film, her hair stays white.
- Magic Pants: In the series, her jumpsuit shrinks and grows with her when she changes size. Also, in the movie, her wedding dress manages to stay on her body in spite of ripping in some places.
- Meaningful Name: Her last name is Murphy. Considering how much goes wrong for her, it's extremely appropriate.
- Mystical White Hair: As a result of getting hit by a Magic Meteor.
- Nice Girl: Susan is a kind and caring woman.
- Picked Last: She had been picked last for dodge ball a lot when she was younger, training dummies were even picked before her.
- Power Dyes Your Hair: Susan's hair turned white after the quantonium she absorbed turned her into a giant. Notably, she retains the white hair even after having the quantonium (temporarily) taken from her body.
- Power Glows: Her skin glows blue as she is about to grow; her fiance literally says this to her.
- Single Woman Seeks Good Man: Susan was in love with Derek, when she thought he was a devoted and loving man. However, she ended up crushed when his true personality showed, and promptly got her revenge.
- Size Shifter: In the series, Susan gains the ability to go from monster-size huge to normal human size at will by thinking certain thoughts.
- Strong Family Resemblance: To her mother, especially before her transformation — Susan is basically a younger version of her mother.
- The Smurfette Principle: She's the team's token girl, albeit their leader.
- Super Strength: One of the advantages of being a 49ft 11in giant imbued with quantonium/hyperion energy is strength enough to easily smash through stone, steel, alien metals, and even energy barriers.
- Took a Level in Badass: Susan learns to embrace herself as a "monster".
- Trademark Favorite Food: Turkey Tetrazzini. Everyone else thinks it's too disgusting to look at, let alone eat. Even B.O.B..
- Tron Lines: These appear on her jumpsuit when she changes her size in the series.
Dr. Herbert Cockroach Ph.D (sometimes referred to by the others as Doc) is a brilliant but mad scientist who, in an experiment to imbue himself with the abilities of a cockroach, ending up with a giant cockroach's head and some cockroach personality, but gained the ability to climb up walls and high resistance to physical damage.
- Amazon Chaser: He is noticeably smitten with Susan after she defeats the giant alien robot. Given his size and species this has a certain element of squick.
- Body Horror: His head got mutated into that of a cockroach.
- Dance Battler: As shown during the film when he uses dance maneuvers to program Gallaxhars ship to self-destruct.
- Evil Laugh: He may be a hero, but he still does plenty of these.
- Expy: Of Andre Delambre from The Fly, who was also a Mad Scientist who fused himself with an insect.
- Extreme Omnivore: Justified since he's a human transformed into a cockroach.
- Gadgeteer Genius
- Half-Human Hybrid: His Origin Story (a parody of 1958 The Fly) is that he's a human who accidentally fused himself with a cockroach.
- Labcoat of Science and Medicine: His usual attire.
- Made of Iron: As it was the point of his experiment, he's now every bit as indestructible as a cockroach.
- Mad Scientist: His whole shtick.
- Nice Guy: Despite being a Mad Scientist with a penchant for Evil Laughs, he's ultimately shown to be a charming and gentlemanly individual - he's willing to do everything he can to help Susan become normal again despite not gaining anything from it, and is perfectly happy to distract the giant robot to allow her to get to safety.
- Omnidisciplinary Scientist
- Sensitive Guy and Manly Man: The Sensitive Guy to Link's Manly Man.
- The Smart Guy: He's the brains of Team Monster, being a master tinker.
- Trademark Favorite Food: His favorite foods are Garbage and Swirlypops.
The Missing Link is a 20,000-year-old fish-ape hybrid who was found frozen and thawed out, only to escape and wreak havoc at his old lagoon habitat. Usually referred to as Link, he behaves as a macho jock most of the time, but is out of shape.
- Badass Decay: In-Universe. the Missing Link apparently once held his own against the navy, the national guard and some baywatchers. Until he beats up about thirty clones in hand-to-tentacle combat, that's very hard to believe.
- Bigfoot, Sasquatch and Yeti: He partly resembles an ape.
- Boisterous Bruiser: In the movie, he starts as a boastful Miles Gloriosus who cultivates this image, but doesn't live up to his own hype... until it's time to rescue Susan.
- Butt-Monkey: The writers like to mess with him a bit: he breaks his back, bumps his head on a manhole cover, spends most of the fight with the alien robot knocked out, gets chlorine in his eyes, ends up mistaken for a defective Gallaxhar clone and almost taken to the incinerator, among other Amusing Injuries.
- Catchphrase: "You don't want to tussle with all this muscle".
- Expy: Of Gillman, being a humanoid aquatic creature.
- Feeling Their Age: Played with. His backstory implies that he was a decent threat, but spending 50 years in a jail has severly impacted his stamina and agility. It really doesn't help that his only fighting experience is against humans when he has to defeat a giant robot.
- Fish Person
- Harmless Freezing: Its in his backstory.
- Human Popsicle: Was frozen for 20,000 years, though granted he's not really human.
- Intergenerational Friendship: With Sqweep in the TV series, with Sqweep being 700+ years old (but mentally still a child) and Link being millions of years old (biologically at least, considering he was frozen in ice for centuries before unfreezing).
- Jerk with a Heart of Gold: He can be pretty full of himself. No matter what though, he does care for his friends.
- The Lancer: Typically the second-in-command after Dr. Cockroach.
- Our Cryptids Are More Mysterious: Seems to be a cross between a Fish Person and a bigfoot.
- Sensitive Guy and Manly Man: The Manly Man to Dr. Cockroach's Sensitive Guy.
- Translator Buddy: To Insectosaurus.
B.O.B. (Benzoate Ostylezene Bicarbonate) is an indestructible gelatinous mass created when a genetically-altered tomato was injected with a chemically-altered ranch dessert topping, the resulting goo gaining some form of consciousness.
- Blob Monster: As literal as the trope can get, given he's a Captain Ersatz of the Trope Namer.
- Breakout Character: As with most Kid Appeal Characters, B.O.B. quickly eclipsed the others to become the most popular character of the movie, leading to his greater prominence in the series. He's also the most likely to appear in DreamWorks-related crossovers as a result.
- Captain Ersatz: Of The Blob.
- Cloudcuckoolander: He lacks a brain, and it shows.
- Cyclops: Only has one eye.
- The Ditz: Literally has no brain.B.O.B: Turns out, you don't need one!
- Extreme Omnivore: He can and will eat anything.
- Fun with Acronyms: His name stands for Bensoate Ostylezene Bicarbonate.
- Ink-Suit Actor: He has Seth Rogen's eye and mouth shape.
- Keet: Is eternally happy and upbeat about everything.
- Kid-Appeal Character: Which explains his prominence in the TV series.
- Rubber Man: Being an indestructible blob, he can absorb any physical attack and bounce it right back. In the movie, at least.
- Too Dumb to Live: He once forgot how to breathe.
Insectosaurus (often referred to as "Insecto") is formerly a 1 inch (25 mm) grub transformed by nuclear radiation into a 350 foot (110 m) monster with the ability to shoot silk out of his nose, similar referencing that he is a giant monster silkworm.
- Attack of the 50-Foot Whatever: Easily the biggest of the Monsters, at 250 feet tall.
- Attention Deficit... Ooh, Shiny!: Easily distracted by bright light.
- The Big Guy: The biggest monster.
- Chuck Cunningham Syndrome: Doesn't appear in the TV series, with no explanation given for his absence.
- Giant Flyer: Becomes this after becoming Butterflysaurus.
- Intelligible Unintelligible: Link serves as his Translator Buddy.
- Shout-Out: To both Godzilla (his origin as a radioactive mutant) and common Godzilla co-star Mothra (his silk-shooting ability, metamorphosis, and general insectoid appearance.)
- Kaiju: Represents this genre of creature feature.
- Team Pet: He's the pet of Link.
General Warren R. Monger is a military leader who runs a top secret facility where monsters are kept. It is his plan to fight the invading aliens with the imprisoned monsters.
- Cool Old Guy: In the film he states that he's been the monsters' warden "for 50 years".
- Expy: Of General Jack D. Ripper, Sterling Hayden's character in Dr. Strangelove.
- Four-Star Badass: Has no problem taking to the field when he has to.
- General Ripper: Implied with his name, but it turns out to be a subversion — he's shocked when the President accidentally launches a nuclear strike.
- Jetpack: He often uses this as transportation.
- Older Than He Looks: He looks good for 90.
- Punny Name: A play on "Warmonger".
- Reasonable Authority Figure: Even though he captured and imprisoned the monsters, he shows a great respect for them.
- Schoolyard Bully All Grown Up: Implied when he wedgies the 'nerd' at the conference who objects to his Monsters vs. Alien plan.
Mentioned in the film and had a brief cameo in "B.O.B.'s Big Break". He susposedly died before the events of the first film.
President Hathaway is the impulsive and dimwitted President of the United States.
- Bring My Brown Pants: "Boys, set the terror level to 'code brown', 'cause I need to change my pants!"
- Dude, Where's My Respect?: In one episode in the animated series, he felt that no one listens to him even though he is the president.note
- Everyone Calls Him "Barkeep": He is often called by his title.
- Ink-Suit Actor: His facial features resemble Stephen Colbert, and his personality is inspired by Colbert's character on The Colbert Report.
- Manchild: He's stupid and immature.
- Our Presidents Are Different: He aspires toward President Action, but in reality he's closer to President Buffoon.
Gallaxhar is an evil alien overlord who hopes to take over Earth and serves as the main antagonist of the film.
- Adaptational Badass: His video game counterpart is portrayed as more control of the situation and also puts up way more of a fight in the final confrontation.
- Big Bad: Of the movie.
- Evil Gloating: He's got Chronic Monologue Disorder something fierce!
- Evil Overlord: He may be a funny character, but he's also a legitimate threat. He did destroy his homeworld, after all.
- Extra Eyes: Shown to have four eyes placed single-file on his head.
- Faux Affably Evil: He's polite but he still has no problem with committing genocide.
- Genocide from the Inside: He mentions that he wiped out his entire planet.
- Jerkass: Gallaxhar isn't nice by any means.
- Origin Story: He tells it to Susan as he's being cloned, but the cloning process keeps interrupting him (in a comic use of Plot-Based Voice Cancellation), so she (and we) only hear parts of it.
Derek Dietl is a local weatherman and Susan's ex-fiancé.
- Alliterative Name: Derek Dietl.
- Disposable Fiancé: Derek turns out to be, in Susan's words, a selfish egotistical jerk. His wedding day attempt to convince her that his job interview in Fresno is an acceptable substitute (rather than an unfortunate delay) for the planned Parisian honeymoon pushes him into the Evil All Along category.
- Hate Sink: While Gallaxhar may be the main threat of the movie, Derek is much more hateable, being an utterly selfish jerkass who only cares about becoming famous and was perfectly willing to break up with his loving girlfriend out of fear that she would upstage him.
- It's All About Me: Derek doesn't care about Susan at all, only about his career.
- Jerkass: Breaks off his engagement with Susan when she turned into a monster. She realized he cares more about his career than her, and angry that it only took becoming a monster to realize that.
- Jerk with a Heart of Jerk: One reason he tries to reconcile with Susan at the end of the film is that he can get a network job in New York City if he gets an exclusive interview with her.
- Married to the Job: The reason Susan breaks up with him is that all he really cares about is becoming a famous weatherman. Indeed, even before she became a monster, he moved their honeymoon from Paris to Fresno so he could attend a job interview.
Introduced in the T.V. series
Coverton is a psychokinetic alien who is the main antagonist of the TV series, he uses a floating chair for transportation.
- Bad Liar: So bad at lying that even B.O.B. isn't fooled by it.
- Charlie Brown Baldness: He has his alien species' equivalent of hair.
- Cool Chair: Has a hover chair to compensate for Earth's gravity. It also contain a variety of weapons.
- Mind over Matter: Possesses powerful telekinesis.
- The Mole: He's on Earth to prepare it for invasion, though he's not very good at keeping it secret, often blurting it out in frustration and having to backtrack.
- The Rival: To Susan as the leaders of their respective teams.
- Smug Snake
- Token Evil Teammate: The only member of Team Alien with a truly malicious agenda.
Sqweep is an adorable, intelligent alien child who has come to Earth because he/she needs to write a report on Earth's dominant species for school.
- Adorkable: She's cute, highly smart, and curious about everything.
- Ambiguous Gender: Her gender is unknown, but a lot of fans believe she is female due to her taste in things and her voice.
- Bizarre Alien Biology: Sqweep's species have a dangerous type of body waste disposal called Number 7 and need a special toilet to handle it.
- Color Coded Emotions: The tips of her antennae tend to glow when she expresses a strong emotion: Green for Happiness/Joy, Yellow for Fear/Anxiety, Red for Anger/Aggression, and Purple for Sadness/Confusion.
- Innocent Prodigy
- Intergenerational Friendship: With Link, Sqweep being 700+ years old (But mentally still a child)and Link being millions of years old (biologically at least, considering he was frozen in ice for centuries before unfreezing).
- Nice Girl: Sqweep is a real sweetheart and any conflict she causes is purely accidental.
- Really 700 Years Old: As revealed in "The Friend Who Wasn't There", Sqweep is 768.
- Shorter Means Smarter: The smartest of Team Alien in addition to being the shortest.
- Ridiculously Cute Critter: She's an adorable little alien.
- The Rival: To Dr. Cockroach in intelligence.
- Token Good Teammate: Sqweep is the only member of Team Alien that is not malicious or aggressive.
Sta'abi is a hotheaded female alien from a warrior/hunting culture.
- Alien Lunch: Sucks down small, tentacled alien creatures whole and alive, because eating cooked food is for Puny Earthlings. A mighty warrior such as herself requires a "live protein diet".Susan: You mean high protein?
Link: (nervously eyeing a pile of the squirming creatures) I don't think she does...
- Proud Warrior Race Gal
- Punny Name: Susan and Link often mispronounce it as "Stabby".
- Green-Skinned Space Babe: Well, she has yellow skin. Still a hottie.
A rambunctious semi-sentient alien, Vornicarn hatched on Earth and briefly incubated inside Link's nose before emerging, rampaging around Area Fifty-Something until Sta'abi captured and tamed him to be her loyal hunting companion.
General Monger had the robot built during the cold-war to run the planet in the event of a nuclear holocaust, with said event having never come to past the robot was put into storage for nearly 70 years.
- A.I. Is a Crapshoot
- Lawful Stupid: Cites rule violations but had no way to enforce them until hooking up with Coverton's chair.
- Logic Bomb: How it was defeated the first time. It fixed that problem the next time he appeared.
- Mind-Control Device: Gained these in his second appearance.
- Trope 2000
- Weaksauce Weakness: Was defeated another time by getting wet by Bob.
Dr. Cutter is a mad scientist who arrives at Area Fifty-Something, to upgrade the base's technology. However she reveals that she has a secret agenda to dissect Coverton's brain to learn the secrets to telekinesis.
- Comic-Book Fantasy Casting: Cutter's design, voice, personality and pandering optimism gives Dr. Cutter a mild resemblance to Hillary Clinton.
- Eyepatch of Power: Has a mechanical eye that looks like an eyepatch. It has all sorts of gadgets in it.
- Labcoat of Science and Medicine
- Mad Scientist: She describes herself as more like a "glad scientist"; she's still crazy.
- Meaningful Name