The character sheet for the Nelvana cartoon, Grossology.
Heroes
One of the main characters, a tomboyish girl who unravels mysteries so disgusting that no adult will touch them. She is very intelligent and loves everything gross and slimy. She likes to test her limits to see if there is something that can make even her, the Queen of Squeam, turn green.
- Action Girl: She frequently brawls with villains during missions.
- Action Hero: She and her brother regularly save the world from nausea-inducing villains using their wits and their trusty slime guns.
- Badass Adorable: She's a cute 13-year-old girl who battles the world's grossest supervillains every episode.
- Enemy Mine: She once teamed up with Insectiva to get rid of a carnivorous plant-themed villain, since said villain threatened both of them.
- Fatal Attractor: Every (named) male she's expressed an attraction towards on the show has turned out to be a supervillain.
- Fiery Redhead: She has red hair, and tends to be more headstrong and temperamental than black-haired Ty.
- Genius Bruiser: She can fight with both her wits and knowledge and brute force; she's both street-smart and book-smart.
- The Lad-ette: Her tomboyish-ness and love of gross things helps her in her job though.
- The Leader: Out of the two siblings, she most likely to take the lead.
- Little Miss Badass: Perfectly capable of holding her own against even the most powerful of villains and is a teenager.
- Passionate Sports Girl: She tried out for her school's volleyball, AND basketball teams.
- Plucky Girl: Even when it seems like the end, she never gives up.
- Tomboy: This is a given since she's a grossologist. Her interests include things that involve being active and has no problem whatsoever with dealing with gross situations.
- Teen Genius: Knows a lot about biology and anatomy.
- Tender Tomboyishness, Foul Femininity: The kind and heroic Tender Tomboyishness to Paige's snobby and selfish Foul Femininity.
- Tomboyish Ponytail: A definite tomboy who wears her hair in a long ponytail.
- Why Did It Have to Be Snakes?: She's very afraid of leeches, as shown in the episode "Vein Drain".
- Yellow/Purple Contrast: Her civilian outfit is primarily purple, and her Slime Suit is yellow.
Abby's younger brother and the other main character. He is very intelligent, possessing a cool, active and analytical personality that takes everything in. He sees himself as a scientist and takes his job as a Grossologist very seriously, and his goal is to be remembered among the very best within the scientific community.
- Action Hero: Kicks just as much villain ass as his sister does.
- Badass Adorable: A precocious teenage boy who battles disgusting supervillains and deals with gross situations on a daily basis.
- Brainwashed and Crazy: Fartor once did this to him so that he could use him for his geology skills.
- Gasshole: When he was brainwashed by Fartor, he became this.
- Genius Bruiser: Hinted to be the most intelligent Grossologist on the team, and again, he does a lot of fighting too.
- The Lancer: Abby's brother and partner in the job.
- Little Mister Badass: Also a teenager and fights very well.
- Teen Genius: Just like his sister, he very knowledgeable in science, and implied to be the smartest in the team.
Tech support for the Bureau of Grossology, and a friend of Ty and Abby. He is always accompanied by his pet rat, Hermes.
- A Day in the Limelight: "Ask the Dust Mites" mainly focuses on him.
- Basement-Dweller: He does nothing but sit around the lab all day, and some episodes note that he rarely ever goes outside. "Owl Be Back" reveals that this is actually due to a fear of the outdoors, though he gets better about it and goes outside to help the team in the field when it is absolutely necessary.
- Black and Nerdy: Rivals the siblings in the science department.
- Blue Is Heroic: He wears all blue.
- Gadgeteer Genius: He often builds contraptions for Abby and Ty to use on their missions.
- Ink-Suit Actor: Concept art depicted him as a chubbier, shorter character before Deven Mack auditioned, redesigning him into a slimmer character of African descent. Supposedly, he even wore the same blue hoodie that became Lab Rat's trademark look.
- Loyal Animal Companion: Hermes, his pet rat.
- Neat Freak: Ironically for a guy who works for a crime-fighting bureau that specializes in “gross” crimes, Lab Rat is far less engrossed by gross and dirty things than Ty and Abby are, and "Stinko" specifically focuses on him and his germaphobia.
- Only Known by Their Nickname: He's rarely called by his first name.
- The Smart Guy: Well, all three of the kids are intelligent, but he's the one that does all the technical work.
- Teen Genius: Just like Abby and Ty, he's a pretty smart guy and even builds most of the gadgets they use.
The head of the Bureau of Grossology...who is entirely in the wrong profession.
- Fartillery: In "Fart Side of the Moon", he out of all characters saves the day using a "powerful butt blast", due to his recent "bean-only" diet resulting in rampant flatulence.
- Neat Freak: Even the slightest hint of anything gross will send him into a panic.
- Nervous Wreck: Every time when there's a situation going on, he freaks out over the grossness of it.
- Pointy-Haired Boss: Not exactly competent at his job and can be ditzy at times.
- Running Gag: His squeamishness will be brought up Once per Episode.
- Small Name, Big Ego: Occasionally tries to take credit for Ty and Abby's successes. This never works, though.
- Wrong Line of Work: He's the director of an organisation dedicated to battling gross threats, but at the same time is also a squeamish coward.
Villains
Once a promising young university student who wanted to study entomology (the study of insects) until she discovered how insects are treated by science: captured and dissected. Now, armed with all sorts of bugs, she pursues an insect agenda, to wipe all people off the planet so bugs can rule again.
- Alliterative Name: Her real name, Cara Chitin.
- Amazing Technicolor Population: She has pale greenish-grey skin, although it appears pale purple in dark areas.
- Enemy Mine: Had one with Abby to fight a villain that was threatening both of them.
- Evil Old Folks: Has definitely aged a lot since her days as a university student.
- Friend to Bugs: To the point where she wants bugs to conquer the planet.
- I Was Quite the Looker: Was quite beautiful during her days as a normal scientist.
- Glasgow Grin: Appears to have this.
- Meaningful Appearance: During flashbacks to her childhood, her young self wears a bow in her hair that looks just like a butterfly.
- Meaningful Name: Her real name is Cara Chitin. Chitin is a substance found in insects' exoskeletons.
- Pest Controller: Obviously.
- Red Eyes, Take Warning: Her eyes are different shades of red.
- Scary Teeth: Has sharp fangs, befitting for her creepy nature.
- Unholy Matrimony: She falls in love with Sloppy Joe in "Pucker Up".
A bitter old sewer worker, who abnormally fused with a living slime mold while working in the sewers one day, becoming a strange giant slime creature with a ghoulish skull-like head seen inside. As he gets more powerful, he aims to cover the surface world with living slime molds.
- Benevolent Boss: He treats his slime mold minions like a group of kindergartners, even telling them to pick a "surface buddy" for their invasion of the surface world.
- Blob Monster: Part-man, part-slime mold.
- Glowing Eyes of Doom: His eyes glow yellow.
- Skull for a Head: A strange giant slime creature with a ghoulish skull-like head seen inside.
Originally just an ordinary kid until his older brother Gary tortured him by stuffing his brother under the bed sheets and farting in there. For fifteen years, he became adapted to breathing the gases in farts. Like a fish being out of water, clean air is toxic for him, so he breathes toxic gases in a dome that he wears on his body. There was only one thing Fartor wanted... revenge on his brother Gary.
- Amazing Technicolor Population: Has blue-grey skin.
- Benevolent Boss: His kind treatment of Ty even after brainwashing him into becoming his minion.
- Body Horror: He was normal human who mutated into a bloated, grey-skinned, methane-reliant monstrosity.
- Fartillery: It's all in his name.
- Gasshole: His abilities revolve around farting and he even breaths methane as a substitute for oxygen.
- Gonk: Post-mutation.
- Powered Armor: He wears this to help him breath and fly around.
- Tragic Villain: His motivations are more out of spite over his condition than out of evil.
- Used to Be a Sweet Kid: He used to be a normal kid named Larry, until his brother's constant Dutch Ovens caused him to mutate into Fartor.
- Woobie, Destroyer of Worlds: Started out as a normal kid who suffered abused by his brother, now turned into a villainous abomination.
An extremely dirty man who after discovering that a whiff of his stink was enough to render people unconscious, vowed to never let a drop of water, soap, or deodorant touch his skin again, and turned to an easy life of crime.
- Amazing Technicolor Population: Sickly greenish-yellow skin. Subverted as it's actually the filth coating him.
- Ambiguously Human: He looks more gorilla-like than human.
- The Brute: His large size and strength makes him a threat.
- Cut Lex Luthor a Check: In "Sloppy Joe to Go", he opens his own restaurant, which quickly becomes popular. Despite this, his sole intent for the business is to provide portions so large that most of it gets thrown away, thus creating more garbage for him to enjoy.
- Fat Bastard: Overweight and a nuisance to everyone around him.
- Fat Slob: He isn't called "Sloppy Joe" for nothing.
- Freudian Excuse: As a child, his family was so poor that all they had to eat was dirt off the floor, but he always received plenty of gifts on Christmas. It made him feel so happy that he always tries to spread Christmas cheer so that others can feel the same way.
- Gonk: Not exactly in the good-looking department.
- Not-So-Harmless Villain: Most of the time he's more of an annoying petty criminal than actually dangerous, but it's shown that some of his actions can have disastrous consequences, such as in "Yack Attack".
- Obliviously Evil: Occasionally he can fall into this. In "Yack Attack", he just wanted to go for a swim in his own quiet vacation spot. The problem is that his "vacation spot" was actually the city's water supply, and he was unknowingly passing his germs to everyone and making them extremely sick.
- Pet the Dog: Turns out he has a soft spot for Christmas, and genuinely tries to be cheerful and spirited in "Let Them Eat Fruitcake", even giving Abby a present.
- The Pig-Pen: Sloppy Joe is covered filth and all of his plans tend to involve filth in some way.
- Uncleanliness Is Next to Ungodliness: No surprise there, since his gimmick is that he never bathes and uses his filth as a weapon.
- Unholy Matrimony: He falls in love with Insectiva in "Pucker Up".
- Weaksauce Weakness: Clean water or just taking a bath in general. While it doesn't really hurt him, he hates it and being sparkling clean will leave him with a Villainous BSoD.
- Weaponized Stench: After discovering that a whiff of his stink was enough to render people unconscious, Joe vowed to never let a drop of water, soap, or deodorant touch his skin again, and turned to an easy life of crime. His plan: go from filthy to filthy rich. He uses his extremely filthy body as his weapon.
- Yellow Eyes of Sneakiness: Has yellow eyes, and is a criminal.
A crazed former beauty queen who was traumatized over a small cut to her shoulder, ending her career. Not seen since then, she used her exceptional degree in dermatology and mythology to create a high-tech dragonfly-winged suit made of scabs, and takes the identity of the Scab Fairy, based on a Tooth Fairy-like myth figure that collects scabs (rather than teeth). She is armed with a high-tech wand that removes scabs from people's wounds, and inflicts them on others. Her ultimate obsession is to inflict scabs on anyone pretty, as revenge for the loss of her old beauty queen career.
- Attention Whore: A crazed beauty queen who wants to inflict unattractive scabs on people who are more beautiful than her.
- Beauty Is Never Tarnished: Her entire character revolves around averting this.
- Clothes Make the Superman: Her flying suit made of scabs gives her superpowers.
- Faux Affably Evil: She often acts like a sweet and giggling fairy, but in reality she's evil and vindictive.
- Green-Eyed Monster: Her motivation is jealousy.
- Pink Means Feminine: Her suit is pink.
Once a successful Grossologist; however, he envied The Director's authority. Boyle tried to pull a coup, using a "prototype shrink-ray." Ty had tinkered with the weapon though, and Lance ended up blasting himself, causing himself to shrink and his head to turn into a giant boil. Banished from the team, he decided to use his skills for evil, with only one goal in his twisted head: revenge against all Grossologists, especially Abby and Ty.
- Bald of Evil: Well, your head turning into a boil can do a number on your hair.
- Beard of Evil: He has a goatee.
- Big Bad: He is the most recurring villain in the series, as well as the Bureau of Grossology's most prevalent enemy, with him wanting to take revenge on them for being fired.
- Body Horror: His head is a giant zit.
- Evil Laugh: Parodied. At one point he forgot to laugh maniacally, and promptly does so.
- Face–Heel Turn: He was originally a Grossologist.
- Green-Eyed Monster: He was always jealous of the Director's authority, believing himself to be much more competent than him. Though to be fair, the Director was never exactly the best choice for the job.
- The Grinch: He tries to ruin Christmas in "Let Them Eat Fruitcake".
- Hoist by His Own Petard: "New Recruits" reveals his mutation was the result of his own shrink-o-matic gun going off in his face. This is attributed to Ty having fiddled with it earlier but failing to put back all the parts.
- I Was Quite a Looker: Used to be tall and handsome.
- Mad Scientist: For example, creating a ray gun that causes nasty diarrhea.
- The Napoleon: Lance Boil is incredibly short in stature. Despite this, he is the Bureau of Grossology's most reviled enemy.
- Never My Fault: In "Pinkeye and the Brain". After he recounts past encounters with Abby and Ty, Roger notes that the duo beat him every time. Lance irritably denies this, claiming that Abby and Ty "just get very, very lucky at the last minute".
- Potty Emergency: Suffers one after getting hit by his own ray gun that causes diarrhea.
- The Resenter: His Face–Heel Turn was motivated by thinking he deserved the Director's job and feeling threatened by the arrival of two young and eager recruits. Some of his schemes (particularly the "Pinkeye's Revenge" two-parter) are explicitly devoted to claiming what he considers his rightful place and knocking those he think outdid him down a peg.
- Tall, Dark, and Handsome: Was this pre-mutation.
- Your Head Asplode: His head has "popped" on a few occasions, and the results look as pleasant as they sound.
A popular and undefeated young basketball player, and Abby's former idol. Endorsed the "KVK-1" brand super-sneakers, with a twisted method behind his fame; he single-handedly manufactured the KVK-1 sneakers for mass consumption, and spiked them with fungus (while wearing a non-spiked "Deluxe Edition" pair for himself, of course), so that everyone will have foot fungus, and most of all, eliminate the competition, so that he will be the only basketball player in the world.
- Attention Whore: Craves even more popularity to the point where he's willing to sabotage other basketball players.
- Bond Villain Stupidity: He puts Abby and Ty on a conveyer belt heading towards a vat of concentrated foot fungus, but leaves before they fall in so he can go to a statue unveiling; naturally, they escape and go after him.
- Broken Pedestal: Abby was originally a fan of him before discovering his villainy.
- Jerk Jock: A famous basketball player and a villain.
- Third-Person Person: He talks like this.
The custodian at Ringworm Junior High School. He grew tired of cleaning up the excess pigeon poop around the school, so he built a giant mechanical owl suit, with which he captures pigeons and plots to put them in a pie to bake them.
- Animal Motif: Owls.
- Butt-Monkey: Constantly has to clean the pigeon poop. This eventually lead to him getting revenge.
- Evil Old Folks: A notably tragic example, as he was initially a kindly handyman who was driven to madness and villainy by Paige's demands that he solve the school's pigeon problem by himself. He's so far gone by the time of his only episode that he's built a robotic owl to capture and ultimately cook the pigeons.
- Gadgeteer Genius: He has a giant owl mech that he built himself.
- Insistent Terminology: He is 'not' a janitor. He is a 'custodial engineer'. Which he points out means his job is to fix things, not clean them.
- Miniature Senior Citizen: He's much shorter than the students.
- Nervous Wreck: He's terrified of Paige, and has the delusion that the pigeons are intelligent and out to get him.
- Nerd Glasses: He has round, oversized glasses.
A teenager who, after a science experiment mishap while trying to find a cure for foods going bad or rotting, gains the "rotting touch," with which he causes all organic materials to rot with a single touch, and also gives off a horrible smell. He becomes a new student at Ringworm Junior High School, and causes chaos upon his arrival, with a concerned Abby and Ty trying to cure him. But Chester's rotting powers literally go to his head, giving him a twisted personality, even christening himself "Kid Rot", and making him a formidable and diabolical foe for the Grossology team. Worse, he has a psychotic infatuation for Abby who ultimately hates his prevalent Kid Rot persona, and will stop at nothing to win her heart, even going as far as to rot the entire world.
- Aborted Arc: By the end of the episode "The King of Rottingham Forest" Ty and Abby presume him dead, though the audience is shown he's still alive, heavily implying his eventual return. Despite this and him appearing in a group shot of villains in the season 2 intro, he never appears or is referenced again.
- All of the Other Reindeer: He is bullied in school.
- Make Them Rot: His rotting powers.
- The Nudifier: As this is a kid's show, the closest he's gotten to using his powers on a person is by rotting clothes made with organic material.
- Superpowered Evil Side: His alter-ego, Kid Rot, overpowers him.
- Villainous Crush: He has a crush on Abby as both Chester and Kid Rot, though it's far more pronounced with the latter. Abby herself seems to have a thing for Chester, but loathes his Kid Rot persona.
- Walking Wasteland: Everything he touches rots.
A mad proctologist, who plots to engulf the world in a gigantic colon, starting with Ringworm Junior High School, to take revenge on people for unsympathetically making fun of him for his unfortunate surname. He has giant tapeworms as henchmen.
- Attack Animal: Has these in the form of giant intestinal parasites.
- Mad Scientist: A typical one, all boiling down to the wardrobe, weird experiments, and Morally Ambiguous Doctorate.
- Morally Ambiguous Doctorate: He uses his knowledge in proctology to aid in his plan.
- Unfortunate Name: Resulting in his Start of Darkness.
A giant monster made of nose mucus stolen by Sloppy Joe using a suction gun, who simply wanted to make a "boogerman" with said mucus much like a snowman. Abby and Ty confront Sloppy Joe, and in the process, inadvertently cause an electrical accident that brings the "boogerman" to life. The monster sucks mucus out of people's noses, and the more he consumes, the larger he gets.
- Blob Monster: Made entirely out of snot.
- Weaksauce Weakness: Its only weakness is dirt particles just like any mucus, which cause him to not only dry up, but decrease in size.
A gothic caped villain whose eyesight is accustomed to darkness. He summons a huge flock of bats to drop guano on anyone who opposes him. As he cannot stand light, his ultimate plan is to plunge the city into eternal darkness.
- Animal Motif: Bats.
- Dark Is Evil: His entire theme.
- Eerie Pale-Skinned Brunette: Has the vampire look, and is definitely eerie to boot.
- Goth: Paige referred to him as one, though he takes offense to it.
- No Celebrities Were Harmed: Based on Ozzy Osbourne.
A lady whose DNA structure was crossed with that of plants. Plotted to use giant carnivorous plants to attack the city, and ultimately, the world.
- Amazing Technicolor Population: Green, due to her being a plant naturally.
- Plant Person: She is part-human, part-plant.
Insectiva's twin sister. Unlike Insectiva, she loves arachnids, as her name suggests. She and Insectiva have had a bitter rivalry, and both pit their own respective arthropods against each other, with catastrophic results.
- Animal Motif: Spiders, of course.
- I Was Quite a Looker: Like her sister, she was pretty cute as a kid.
- Pest Controller: Just like her sister, though this time she controls arachnids like spiders.
A hair dresser who doesn't like to change styles. After getting kicked out of a job, he went underground doing biological experiments, and ended up with living hair.
- Mad Scientist: A biochemist whose experiments cause his hair to gain superpowers.
- Prehensile Hair: He uses his hair as a weapon.
A kid with bacterial conjunctivitis. He is curious about Ty and Abby's extra-curricular activities, and thus sets off to find the truth about his classmates' secret identities, using various attempts to do so that ultimately end in failure. He eventually becomes a Grossologist, but he is fired/quits after his plan backfires with Lance betraying him.
- Ain't Too Proud to Beg: Resorts to begging and crying in order to get Ty and Abby's secret identity from Lance Boil.
- Butt-Monkey: Let's see; he's generally regarded as a loser, is constantly called by an Embarrassing Nickname, had his room completely trashed (multiple times), almost died from black mold exposure, trampled on by jocks, had his camera destroyed, forced to beg for the info he wants, driven to tears, locked in a cage, betrayed, and kicked out of a top-secret organization. And that was all within five episodesnote .
- Childish Tooth Gap: A 12-ish year old kid with a missing front tooth.
- Early-Bird Cameo: He first appeared as one of the students in the bathroom line in "Flushed Away"note , before being properly introduced with a name and purpose in "Mold Monster"note .
- Early Installment Character-Design Difference: In his Early-Bird Cameo in "Flushed Away", his left eye was infected. In all subsequent appearances, it's his right eye instead.
- Embarrassing Nickname: Being called "Pinkeye" is not something he's proud of; in "Pinkeye and the Brain", he even cries about it.
- Eye Scream: His diseased right eye.
- Fiery Redhead: An eccentric redhead.
- Named After the Injury: Is called Pinkeye by his peers because of his bacterial conjunctivitis. He is not the least bit pleased about it.
- Speech Impediment: Has a lisp.
- However, it's rather inconsistent, notably in "Pinkeye and the Brain", where he begs Lance Boil to "tell me Ty and Abby's thecrets, please, pleath".
- Trademark Favorite Food: He has an affinity for cheese; experimenting on it, that is.
A disgraced opera star, who was once part of the Three Baritones. He's back for revenge, but this time he's singing a whole new tune; in other words, he's now a burping star.
- Balloon Belly: Turns out that Basso is obese because of all the gas built up inside him.
- Big Eater: Eats a lot of meat and other rich foods, which help fuel his burping powers.
- Evil Sounds Deep: Has a baritone voice, though it's noticeably higher when he's skinny.
- Fat Bastard: Though he's actually just bloated, rather than fat.
- Fat Slob: If his powers didn't already tip you off, his eating habits are disgusting as well, gorging nonstop on greasy foods and his shirt even being covered in grease stains.
- Karma Houdini: His episode ends with him running away, presumably getting away scott-free with his destruction and havoc.
- Jabba Table Manners: He is shown pigging out when Mr. Archer meets him at the auditorium.
- Jerkass: He is extremely rude to Mr. Archer even after the latter stated he was a huge fan of his.
- Gasshole: His burping abilities.
- Gonk: He's by no means pleasant-looking, even before getting extremely big.
- Make Me Wanna Shout: His sonic belches serve as this, even being able to shatter glass.
- Ominous Opera Cape: Naturally, due to him being an opera singer.
- Villainous Glutton: Constantly stuffs himself with meat and cheese which results in severe gas, and is completely unwilling to share his food with other people.
A crazy man with a big sweet tooth and a lot of rotten teeth. His plan is to make super tooth-rotting candy, pretending that they'll take care of your teeth, and distribute them to everyone, so he won't be the only one with a rotten mouth and a large craving for candy.
- Ax-Crazy: In addition to evil, he's also downright insane.
- Corrupted Character Copy: He's basically supervillain Willy Wonka.
- Evil Old Folks: Quite old and decrepit-looking.
- Scary Teeth: His jagged, rotten teeth give off this impression.
- Sinister Sweet Tooth: Likes candy so much he's willing to steal it to get his next sweet tooth fix. However, as a result of his candy obsession, his teeth are all rotten and he occasionally spits one out. Bitter at the next generation's healthy teeth, he invented the "Gary Gumdrop" persona and began giving out candy laced with concentrated gingivitis bacteria.
An old man running a campground who is tired of campers bringing their new electronic devices with them, so he uses mutated worms to scare away people from his lake.
- Grumpy Old Man: To a villainous degree. He doesn't like campers playing with electronics, so goes to great lengths to get rid of them.
- Well-Intentioned Extremist: He only wants to get rid of the "city folks" because of how disruptive they are, although scaring them away is probably a bit too much.
Misc. Characters
Abby's snobbish and popular rival at school.
- Alpha Bitch: She is quite mean to Abby and generally acts rude to everyone.
- Beauty Is Never Tarnished: Averted. Despite being the snobbish and prudish Alpha Bitch, she is still prone to gross things like farting.
- The Chew Toy: Frequently falls victim to embarrassing and gross mishaps, but they're almost always deserved.
- Dumb Blonde: In addition to her snotty behavior, she can also be naïve.
- Girly Girl with a Tomboy Streak: Despite being a girly Alpha Bitch, she enjoys sports such as basketball and even challenges Abby to a chocolate shake-drinking contest in one episode.
- Girl Posse: She has two syncophants who blindly follow her around.
- Pink Means Feminine: She wears all pink.
- Sudden Name Change: She was referred to as "Paige Parmington" in "The Scab Fairy".
- Tender Tomboyishness, Foul Femininity: The snobby and selfish Foul Femininity to Abby's kind and heroic Tender Tomboyishness.
- With Friends Like These...: Frequently orders around and berates her posse. She mentions in "Ask the Dust Mites" that she is quite prone to scapegoating friends for her actions and getting new friends afterwards.
A gruff, burly police detective, who occasionally works with Abby and Ty on cases, and is the only outsider who knows their secret.
- The Big Guy: He towers over Ty and Abby, and serves this role in their investigations.
- Conspiracy Theorist: A firm believer in the Sewer Gator Urban Legend.
- A Day in the Limelight: "Flushed Away" has him more directly involved in the case, giving insight into his personality and his unique approach to police work.
- It's Personal: He insists on solving the case in "Flushed Away" by himself for this reason. He flashed a baby gator in his youth and thus feels this situation is something he must atone for.
- No Name Given: He is only known as "The Detective".
Ty's crush, and later his girlfriend.
- Bespectacled Cutie: An adorable girl with big glasses.
- The Cutie: A very cute and friendly girl.
- Delicate and Sickly: While she doesn't fully lean into being a Sickly Neurotic Geek, in "When Allergies Attack" she reveals that she has a long list of food and airborne allergies.
- Nice Girl: There isn't a mean bone in the girl's body.
- Official Couple: Becomes this with Ty eventually.
Abby and Ty's father and mother, respectively. Both are shown to be gullible, and as such, are completely unaware of their children's secret jobs as Grossologists.
- Bumbling Dad: Harvey can be this at times.
- Bunny-Ears Lawyer: Despite Harvey's goofiness, he works at a water treatment center and seems to know his stuff. Same for Petunia and her job as an entomologist.
- The Ditz: Both of them are not exactly bright.
- Gasshole: Harvey becomes this in "Ain't Over 'Til The Fat Man Sings", unaware that his burping is annoying to his wife and children.
- Parental Obliviousness: They are completely unaware that their kids are out doing dangerous spy missions.
- Strong Family Resemblance: They both look eerily similar to their kids.
- Why Did It Have to Be Snakes?: Petunia is afraid of heights.
An often nervous and uptight teacher at Ringworm Junior High School.
