George and Harold's Families
George's mom and dad who works as a college teacher and mechanic respectively.
- Alliterative Name: Barbara Beard.
- All There in the Manual: Their names and professions were revealed by none other than Dav Pilkey.
- Farm Girl: Barbara admits to having grown up on a farm when she was a girl. According to her husband, it's a topic that's frequently brought up.
- Kick the Dog: In Book 12, after being turned into mindless, obedient children by Mr. Meaner, Moses and Barbara openly state how they approve of their son and friend's complete personality change compared to how they normally behave. What they didn't know was that an alternate version of George and Harold were in the other room and heard all of it.
- Meaningful Name:
- Barbara shares the same first name as Dav Pilkeys own mother, who had always encouraged his writing and artwork from childhood.
- Its possible that Moses was named after Moses Horowitz, or as you all know him as Moe Howard.
- Small Role, Big Impact: Moses has a minor role in the story, but it's thanks to his craftsmanship that he created the headquarters for Treehouse Comix Inc.
- The Scrooge: Moses shows shades of this in the Halloween special as he isn't interested in spending.
- Strong Family Resemblance: Moses looks a lot like George only chubbier and with a mustache.
- When I Was Your Age...: Moses states this trope when describing what his summer camp was like as a kid.
Harold's mom who works as a real estate agent and has an interest in drawing just like her son.
- All There in the Manual: Just like with the Beards, Dav Pilkey revealed her name and profession on social media.
- The Ditz: She often gets carried away with things that she doesn't notice important details. The biggest example is how she didn't notice George and Harold's miserable faces compared to Krupp's noticeably wicked grin alongside them. It's especially jarring since she was painting those expressions for her portrait.
- Glamorous Single Mother: It's established in Book 9 that Harold's father left them when he was in kindergarten but Grace has been able to adjust quite nicely without him.
- Kick the Dog: In Book 12, after being turned into mindless, obedient children by Mr. Meaner, Grace openly states how she enjoys her son and friend's complete personality change compared to how they normally behave. What she didn't know was that an alternate version of Harold alongside George was in the other room and heard all of it.
- Like Mother Like Son: Just like her son, Grace is also a talented artist who is capable of creating portraits in only seconds.
- Ship Tease: With Mr. Meaner of all people in the Halloween Special.
- Strong Family Resemblance: She looks very similar to her son.
- Verbal Tic: Similar to Dressy, she has a habit of repeating the last few words of a sentence, only she doesnt sing them.
Harolds little sister.
- Adapted Out: Its sadly starting to look like this in the animated series. As this is being written, theres been 3 seasons and a Halloween Special, and she hasnt been seen or mentioned once, to the disappointment of fans.
- Alliterative Name: Heidi Hutchins.
- Annoying Younger Sibling: Surprisingly averted from what little weve seen of her, and Harold never speaks ill of her either, so its heavily implied that they actually have a good bond with each other.
- Hereditary Hairstyle: Subverted. Her curly hairstyle is the same as her moms, but the Full-Color version of the books shows that her hair is strawberry blonde as opposed to her mom and brothers blonde.
- Oblivious Younger Sibling: She has pretty much no clue about the crazy adventures her big brother and his best friend have been on.
- Small Role, Big Impact: She appears only twice in the entire book series, and doesnt have a single line of dialogue. But its Harold switching Krupps incriminating video of him and George pranking the school football game, with one of her Boomer the Purple Dragon Sing-A-Long videos in the first book, that results in Jerome Horwitz Elementarys football team, the Knuckleheads, changing their name to the Purple Dragon Sing-A-Long Friends.
The Arthritic Avengers and George and Harold's grandparents. They turn into superheroes after accidentally drinking the boys' superpower juice and save the day by defeating their Purple Potty counterparts.
- Alliterative Name: Boxer Boy and Great Granny Girdle.
- Big Damn Heroes: Just when it looks like the boys are about to get pummeled by Captain Blunderpants, their grandparents arrive at the nick of time and reveal their new superpowers.
- Cane Fu: Boxer Boy uses a cane while Great Granny Girdle uses a walker for combat.
- Cool Old Guy / Cool Old Lady: Both of them are very loving towards George and Harold and are supportive of their talents as comic book creators. They also manage to protect them by giving their evil counterparts an unforgettable smackdown.
- DecemberDecember Romance: After successfully defeating the villains, the two elders begin to flirt with one another and fly off to enjoy an early bird special together.
- Never Mess with Granny: Captain Blunderpants and his wicked creators learned the hard way on not messing with Great Granny Girdle's grandson.
- Older Is Better: In the comic that their grandsons make of them, the main message is how old people, especially grandparents, are really cool and that they shouldn't be taken for granted.
- Salt and Pepper: Boxer Boy is the Salt to Great Granny Girdle's Pepper.
- What Happened to the Mouse?: There's no mention of them or what became of their careers as the Arthritic Avengers after Book 8.
- When Elders Attack: Thankfully they're on our side!
The spouses and children that George and Harold will have as part of their happy and successful futures. Lisa Bobeesa is George's wife and their children are Meena and Nik. Billy Doanbee-Ahiro is Harold's husband and their children are twins named Owen and Kei.
- Ambiguously Brown: Billy's last name suggests that he is half-Japanese.
- Elegant Classical Musician: Lisa is revealed to be a talented violinist.
- Half-Identical Twins: Owen and Kei have the same appearance except for their gender.
- Happily Adopted: They were also adopted and couldn't be happier with their loving dads.
- Hidden Depths: Billy works in theatre and used to be an actor on a soap opera.
- Last Episode, New Character: The two families were introduced in the twelfth/last book of the Captain Underpants saga.
- Meet Cute: Harold first met Billy in college where they attended the same improv comedy club.
- Punny Name: Billy's name is based on the song Billy Don't Be A Hero.
- Raven Hair, Ivory Skin: Lisa fits this to a T.
- Salt and Pepper: Lisa is the Salt to George's Pepper.
- Straight Gay: Billy is gay but doesn't show any of the common traits associated with the stereotype.
- Unfazed Everyman: The spouses and children take the reveal of George and Harold being able to travel through time fairly well.
Civilians of Piqua
A little boy and his mom who often appear as minor characters in the books. Their main shtick is how the boy would tell his mom about the wild events happening in the plotline while his mom would brush it off as his wild imagination.
- All There in the Manual: According to an old newsletter on the Scholastic website, their names are Robby and Ethel Hoskins.
- Cassandra Truth: In their early appearances, the mom simply brushes off her son's statements as pure nonsense. Then the roles are switched when the boy won't believe the mom when she starts seeing things. It isn't until Book 12, their last appearance, do they finally take notice of the bizarre event together. In that case, George and Harold's time traveling in a glowing squid suit.
- Deadpan Snarker: The boy makes some snarky remarks when the mom starts to notice the action. Most likely from how he had to go through therapy because of her.
- Flat Character: Neither the boy nor his mom has any significant character development.
- Iconic Item: The mom is always shown wearing boots with stars on the sides. She even wears them when she's an old woman in the future.
- Running Gag: The boy would notice Captain Underpants or a villain of the week while the mom believes that it's part of his over-active imagination.
- Swapped Roles: It isn't until their fifth and last appearances do the roles switch where the mom starts to notice the bizarre events while her son dismisses them.
Melvins father, and a professor who apparently works for the government alongside his wife.
- Adaptation Dye-Job: In the Full Color versions of the books, his hair is a light tan color. In the animated series, its the same shade of orange as his wife and sons.
- Adapted Out / Ambiguously Absent Parent: Despite appearing with his wife in Books 6 and 7, he hasnt been seen or mentioned once in the animated series yet. Eventually averted in season 3, where he makes an appearance alongside his wife.
- Embarrassing First Name: His name is Gaylord. You cant really get more embarrassing than that.
- Glad I Thought of It: In Book 6, After Melvins defeat as the Bionic Booger Boy, Mr. Sneedly mentions that itll take a few months to create a machine to reverse the effects of the Combine-O-Tron 2000, the machine that turned Melvin into the Bionic Booger Boy in the first place. When George suggests switching around the Combine-O-Tron 2000s batteries, theorizing that itll reverse the effects, he at first dismisses this idea as childish but decides to do it anyway to prove them wrong. When this actually does reverse the effects, he exclaims, Well, what do you know? My idea worked. George and Harold simply roll their eyes in annoyance.
- Like Father, Like Son: Its obvious where Melvin gets his looks and arrogant attitude from.
- Parents as People: While his and his wifes work leave them far too busy to spend time with their son, they still do care about him.
- Redheads Are Uncool: In the animated series. His hair is just as red as his wife and sons, and hes just as nerdy.
- Skewed Priorities: In his animated debut, he's more interested in his son building a teleporter rather than hearing about anything else going on in his life.
Melvins mother, who works alongside her husband in the books and is Melvin's main caregiver in the animated series.
- Amazingly Embarrassing Parents: She shows this trait now and then. Her biggest example is her openly declaring herself to be her son's best friend.
- Adaptational Personality Change: In the manga series, Cindy was a serious, dedicated scientist who focused more on her science projects over her son (but she at least cared about him). In the cartoon, she has a more playful personality and is dedicated to tending to her son's needs no matter how much she spoils him.
- Doting Parent: Despite how much of a brat her son can be, she clearly thinks the world of him.
- Hands-Off Parenting: In the animated series, she pretty much lets Melvin do whatever he wants, be it inventing or taking over his school with his future self.
- Parents as People: In the books, her work with her husband leaves them both far too busy to spend time with Melvin, but they still do care about him.
- Pushover Parents: In the animated series. The poor woman practically lets Melvin walk all over her.
- Redheads Are Uncool: Melvin most likely got his red hair from her, and shes clearly as nerdy as her son.
- Unnamed Parent: Shes only ever referred to as Mommy or Mother by Melvin, and Mrs. Sneedly or Melvins Mom by everyone else in the books and animated series. Its only thanks to Dav Pilkey that we know her first name; Cindy.
- Wacky Parent, Serious Child: Only in the animated series. Shes rather silly compared to Melvin, who takes more after his father in terms of personality.
- Youthful Freckles: Only in the books.
Mr. Krupp's mother who runs her own cattle farm. She's one of the reasons why Krupp is the monster he is today.
- Abusive Parents: One of the worst cases imaginable. She forbade her son from participating in his 4th-grade talent show even though he wanted to. When little Benny ran off and made a poor performance, she encourages all the attendees to throw fruits and vegetables at him, all of which she provided. She even took pictures of the spectacle and has them framed in her living room. Not to mention that she refers to him as a major disappointment. In Season 3, Mr. Krupp even goes on to say that she never loved him, she just wanted him to do chores.
- Adaptation Name Change: On Instagram, Dav Pilkey claimed that her name was Grace. Her name was changed to Bernice in her debut, most likely to avoid confusing her with Grace Hutchins and Grace Wain.
- Affably Evil: Despite being an abusive monster, she's very polite when interacting with the boys. She even offers them free steak.
- The Ageless: Her appearance from when she ruined her son's life is the same 30 years later.
- Beehive Hairdo: Her hairstyle looks like this.
- Early-Bird Cameo: She actually appeared an episode before her debut. Also, Miss Anthrope mentions in early episodes that she called Mr. Krupp during his work.
- Fat Bitch: She's fat like her son with a heart that's darker than his.
- Hate Sink: She's the primary reason why Krupp is such a Child Hater in the present.
- Jerkass: This goes without saying.
- Never My Fault: She doesnt once own up to the fact that it was her lousy parenting that made Krupp the way he is.
- Noodle Incident: She has an ongoing rivalry with some mischievous cows that are somehow smart enough to open her front door multiple times.
- Strong Family Resemblance: She looks exactly like her son only with a full head of hair.
The new superintendent introduced in Season 2. She's actually Erica Wang from the future who time-traveled to ensure her younger self's entry into Eliteanati Academy.
- Afro Asskicker: She doesn't engage in actual combat, but she manages to put the Melvins in their place from going too far in how they run the school.
- Beyond the Impossible: Not only does she manage to become president of the entire planet, but she also manages to achieve world peace in only 2 years into her presidency.
- Big Good: Her first appearance sets her up like this. She's the only person that has power over Melvinborg and can stop him from harming George and Harold in any way possible. The Season 2 finale expands on this with the reveal that she is actually the President of Earth from the future and manages to achieve world peace 2 years into her presidency. She also encourages Melvin by telling him that he can guarantee himself a successful future if he makes the effort to change himself for the better.
- Black Boss Lady: She's the new superintendent of the Piqua School District. She's also the future president of Earth.
- The Cameo: She appears in a flashback during the Epic Choice-O-Rama special.
- Good Counterpart: To Melvinborg. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own; Future!Melvin, on the other hand, was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Eliteanati Academy.
- History Repeats: The second Piqua superintendent that turned out to be the future self of a Jerome Horwitz student, though this one is significantly nicer than the last one.
- Lady in a Power Suit: She wears a blazer and pants combo, befitting her professional appearance.
- Meaningful Name: Her name is a Shout-Out to Bruce Wayne. Along with being a cool, powerful, and influential figure, it's also an inverted secret identity for her present self, Erica Wang. Bonus points in that Erica were earlier described as "Batman without the angry grumbling".
- Ridiculously Successful Future Self: For Erica. It doesn't get any better than being president of the entire planet.
- Self Made Woman: Considering how Erica took her academic career seriously while also being a genuinely good person, it all paid off with the reveal of her incredibly successful future.
The sponsors of Robe-I-Con, are a powerful organization that has a hand in managing the affairs of the world governments.
- Big Good: They've had a hand in helping historical leaders revolutionize the world for the better. The Society also helped subdue the Splotch and offer the boys and Captain Underpants an invitation to join them for their heroic display.
- Cool Old Guy/Cool Old Lady: Several of the members are significantly older but are very proactive in their influential organization.
- Dreadlock Rasta: Robius has long, beautiful dreadlocks.
- Gang of Hats: All of them, true to the name, wear robes.
- The Illuminati: The Society of Robes is a parody of this. They have a strong reputation for creating powerful and influential leaders to govern the nations throughout history, from Cleopatra VII to Abraham Lincoln to even acrobats. The ending of their episode also reveals that they have connections to life beyond the Earth as well as using alien technology when necessary.
- Multinational Team: Along with Robius who is black, three other members are people of color and two that are Caucasian.
- Punny Name: "Robius" is the president of an organization that wears "robes".
- Two Girls to a Team: There are two distinct female members among the group.
Piqua's overly-enthusiastic mayor who tries to get others to be as pumped as her.
- Ambiguously Brown: She has orange skin, though that could very well be from a suntan.
- Bunny-Ears Lawyer: She may be a few prawns short of a galaxy, but she must be quite competent considering that she's the mayor of the town.
- Catchphrase: She tends to say "Bee-Yah!" when she's extra excited.
- Eye Glasses: Her glasses tend to move like if her real eyes.
- Friend to All Children: She tries very hard to be this.
- Genki Girl: More like a Genki Woman, as she's very excitable.
- Hartman Hips: She has noticeably wide hips.
- Mayor Pain: Zigzagged in the Halloween special. In the beginning, she eagerly went along with Krupp and Melvin's plans to cancel and later illegalize Halloween after rallying support from the public. Later on, when the boys create Hack-O-Ween, she's shown to participate in the festivity by offering fried shrimp to the sneak-or-snackers. And in the end, she decides to veto the original order and allows Halloween to be celebrated again.
- Meaningful Name: Her two names are a few vowels away from the words "happy" and "chipper". Both of which reflect her enthusiastic personality.
- The Pollyanna: She still keeps her cool and energy even after the town is attacked by an inter-dimensional monster.
- Perpetual Smiler: Her default expression is a big grin, and she rarely makes any other expression.
A friendly billionaire who runs a summer camp for rich kids who appears in season 3.
- Ambiguously Brown: He has a dark skin color but there isn't anything else that suggests what his ethnicity is.
- Big Good: He becomes this in the season 3 finale as George and Harold beg him to buy their summer camp so that Krupp wouldn't be able to return and ruin next year's summer. Cash was all too willing to buy it for them and does so after being satisfied with their talent show performance.
- The Cameo: He makes a cameo as a caroler in the Christmas Special.
- The Ditz: Shows several signs of this trope in his second appearance.
- Friend to All Children: He's the main director of a summer camp for rich kids (who look exactly like George, Harold, and their friends but richer) and is always hospitable when interacting with George and Harold.
- Full-Body Disguise: In the season 3 finale, he disguised himself as punch-happy actor Lee Dingman so he can watch the talent show and judge it without it being tampered with due to Cash's influence.
- Meaningful Name: His first and last name are blatant references to his billionaire image.
- Money to Throw Away: He apparently has so much money that he even asks the boys to throw away two giant money bags as they leave.
- Uncle Pennybags: Cash is a good man with a heart of 20K gold. He gets along great with the main heroes and has the patience of a saint when dealing with Krupp's insufferable antics.
A macho paintball promoter who has a great disdain for law and order. He's also Mr. Ree's estranged brother.
- Big Little Brother: Heavily implied when you compare him to Mr. Ree, who appears to be both older and shorter than him.
- Brainwashed and Crazy: As Camoflush, his pink paintballs turn the children into semi-obedient paintball soldiers called Toilet Troops.
- Canada, Eh?: According to his brother, their parents were French-Canadian.
- Expy: With his cloaking ability and skills, Camoflush is basically a more kid-friendly Predator.
- Family Drama: He and his brother have a strained relationship that's lasted for years because of Lavator's carefree attitude and his disdain for following the rules. It takes Toilette having to Scare Them Straight for Lavator to see the error of his ways and for them to strengthen their bond as brothers.
- Foolish Sibling, Responsible Sibling: He's the hot-headed, rule-defying, foolish sibling to his brother's collected, rule-abiding, responsible sibling.
- Hoist by His Own Petard: Camoflush brainwashes the kids into becoming Toilet Troops to create his rule-free world. To his dismay, his soldiers don't completely obey him and aren't as effective as he'd like them to be.
- Hot-Blooded: Highly passionate about both paintball and his anti-rules attitude.
- Hypocritical Humor: The boys and Erica openly call out how he's aiming to create a rule-free world while creating an army to enforce this, as armies need rules and discipline to work.
- Invisibility: One of his main powers when he becomes Camoflush.
- Monster of the Week: After an experimental clogging accident fuses his body with his paintball guns and a port-o-potty, Major Messy transforms into Camoflush, a gritty soldier who intends to rid the world of rules and order alongside his army of brainwashed paintball troopers.
- Muscles Are Meaningless: Despite his buff physique, he can't rip apart a thick rule book unlike Bo.
- Must Have Caffeine: He's shown chugging decanters of coffee.
- The Nicknamer: He gives codenames to the kids that he brainwashes. (Ex. Bo as "Cannonball", Dressy as "Moonbeam" etc.).
- One of the Kids: He has an easier time bonding with the kids because he shares their dislike of rules and their desire for fun.
- Perma-Stubble: He has a five o'clock shadow.
- Punny Name: His real name, Lavator Ree, is a pun on the word "lavatory".
- Rated M for Manly: One of the manliest characters in the series.
- Sibling Team: After the tragedy at T.E.R.D.S., he and his brother Toilette Ree formed a research team named P.O.O.P.S. But because of Lavator's reckless actions, the team was disbanded and their brotherhood strained.
- Super Soldier: His main archetype is Camoflush.
- We Can Rule Together: He tries this on Mr. Ree, his brother, so they can create a new world order.
The creepily named owner of the Hall-O-Warehouse.
- Butt-Monkey: The poor guy suffers a lot of misfortune in the Halloween Special.
- Friend to All Children: He gets along well with the boys and helps them along with their friends fight back against the Halloween ban.
- Large Ham: Yep.
- No Indoor Voice: He is always yelling in every scene he's in.
- Unfortunate Names: Lampshaded by Erica, who points out that a name like Creeply Rattlechains doesnt leave him a lot of options for a job.
- Verbal Tic: Occasionally says something scary before correcting himself:Creeply: Your batteries are right inDIED! I mean inside!
The elderly neighbor of George and Harold. He's actually the legendary Kung Fu-Bathroom Hero: Viper Chai from the days of yore.
- Catchphrase: "You crossed the line, man! Crossed the line!"
- Celebrity Superhero: He's an incredibly successful actor who made it big with his kung fu action movies. And even after retiring, his fighting skills and heroic spirit are far from diminished.
- Does Not Like Shoes: He prefers to be barefooted whenever he's in his hero persona.
- Retired Badass: Averted. He retired from acting and is well into his twilight years but he still becomes Viper Chai when the situation calls for it.
- Ship Tease: If the viewer decides to help him find true love, the boys fix Mr. Cleveland up with Ms. Anthrope. Simply put, the two make Disney romance development look like child's play.
- Uncle Pennybags: Zigzagged. On one hand, he's incredibly rich and offered to rebuild the boys' treehouse in one of the endings where it was destroyed. But on the other hand, he was only willing to help the boys if they paid him one million and one dollars for the tiny piece of the treehouse that was on his property.
A serious and dedicated astronaut of P.O.O.P.S.I.E. Despite the misgivings of her mission, she begrudgingly becomes the captain of Jerome Horwitz when the school wins a free trip to space.
- The Ace: Shes a skilled astronaut, and as we see through flashbacks to her and Krupps high school days, she won the science fair, was a wrestling champ, and was voted Prom Queen.
- Awesome Mc Coolname: Her first and last names are based on the concept of "coolness".
- Birds of a Feather: She gets along great with Erica due to her competence, level-headedness and how she isn't a reckless thrill-seeker like everyone else on the ship.
- Black Boss Lady: She's African American and is the captain of the Jerome Horwitz spaceship.
- Boyish Short Hair: She has an afro flat top hairstyle.
- Only Sane Woman: Shes the only adult on the entire ship who takes this mission seriously.
- The Rival: Subverted. Krupp has seen her as one since high school, but in reality, she barely knew he existed.
Pets and Creatures
A cyborg hamster who initially belonged to Melvin as part of his Show and Tell project. After being mistreated by his owner, George and Harold decide to adopt the little guy and treat him with more care.
- Badass Adorable: He's a hamster who can lift objects twenty times his size with ease and singlehandedly beat down Melvin after he turned into a monster.
- Brainwashed and Crazy: For a time thanks to Evil! George and Harold's 3D Hypno Ring.
- Combo Platter Powers: Melvin programmed in a lot of powers into the Robo-hamster he fused Sulu with. Once he became cybernetic, he gained Super Strength, Super Speed, Super Toughness, Eye Beams, and Flight.
- Cyborg: A cyborg hamster.
- Fluffy the Terrible: A little hamster who can beat people up and fight rampaging monsters.
- Interspecies Romance: He fathered some hamster-pterodactyl babies with Crackers.
- Killed Off for Real: In Book 10 alongside Crackers when they sacrifice themselves to save the world by sending Tippy to the time of the Big Bang while he was holding a bomb, resulting in all of them dying.
- Loyal Animal Companion: To George and Harold, when they take him in after he's abandoned by Melvin.
- Ridiculously Cute Critter: An adorable hamster.
- Team Pet: Along with Crackers.
A Quetzalcoatlus/pterodactyl that George and Harold pick up while traveling through time. Crackers prove to be a loyal ally and is always there to help the boys no matter what.
- Everything's Better with Dinosaurs: A pterodactyl.
- Interspecies Romance: Revealed to have mated with Sulu and laid three eggs which hatched into hamster-pterodactyl babies.
- Killed Off for Real: In Book 10 alongside Sulu. They both die in the explosion of Tippy holding a bomb while they were in the Big Bang.
- Loyal Animal Companion: To George and Harold, saving their lives on some occasions.
- Samus Is a Girl: The reason why Evil!George and Harold's 3D Hypno-Ring didn't affect her when she and Sulu were captured by them in Book 8, though this only became truly obvious after Book 11.
- Tastes Like Friendship: It became friendly to George and Harold after being lured with crackers, hence its name.
- Team Pet: Along with Sulu.
The legendary goat-sucker of Mexican folklore. Mr. Meaner has an extreme fear of Chupacabra because of what he did to her many years ago.
- Chupacabra: The one and only. Or so you think.
- Interspecies Romance: She gets into a relationship with Ratrick, a mutated rat monster.
- Monster Modesty: She wears a dark brown tunic.
- Our Werewolves Are Different: An inverted example. She's a chupacabra but her design is similar to that of a werewolf.
- Revenge: Her primary motivation.
- Tertiary Sexual Characteristics: To showcase her female gender, Chupacabra wears a tunic that covers her whole body and has visible eyelashes.
- Woman Scorned: The reason she was after Meaner was that he captured her lover while he was on vacation and had him taken to the authorities forever. Fueled by heartbreak and fury, she's been after his tail for vengeance.
A miserable rat that was assigned to George and Harold as part of their school animal project. After being drenched in toxic residue, he evolves into the fearsome ''Poopacabra''.
- Ambiguously Bi: Ratrick's partner was all but stated to have been a male rat and they loved each other very much. Later on, Ratrick would find a new lover in Chupacabra, who is female.
- Depression: Ratrick fell into a depressed state after being separated from his partner.
- Evil Smells Bad: As Poopacabra, he has a horrendous odor that most people can barely tolerate.
- Interspecies Romance: With Chupacabra.
- Monster Modesty: He wears a diaper as Poopacabra.
- Rat Men: He takes on a more humanoid form as Poopacabra.
- Red Eyes, Take Warning: He has these in his monster form.
- Shown Their Work: Ratrick displays a lot of qualities that Real Life rats portray. Such as the capability of learning and performing tricks (creating a comic to give out his message) as well as needing companionship or else they'll fall into depression (Ratrick being separated from his partner).
- You Dirty Rat!: Zigzagged. At first, Ratrick doesn't display the negative aspects associated with this trope. (He longs for companionship and is too melancholic to do much). But then he lives up to the trope when he turns into Poopacabra and attacks the boys in revenge. And then it's subverted after he finds a new partner in the Chupacabra and feels genuine happiness.
A fun-loving dinosaur with a knack for pranks and mischief.
- Ascended Fanboy: Diddly gets to live out his dream in pulling pranks alongside George and Harold. However...
- Broken Pedestal: He's heartbroken when his idols flat out tell him that his "Diddly Drops" prank is crossing the line.
- Everything's Better with Dinosaurs: He's a velociraptor with a quirky personality and is always fun to be around. Unless you're one of his pranking victims; in which case, good luck.
- I'm Your Biggest Fan: To George and Harold. Diddly based his life and identity around their love of pranks and is ecstatic to meet them for the first time.
- HeelFace Turn: After being saved by the boys, he decides to turn over a new leaf and make an honest living as a pizzeria owner. Though he still tends to pull pranks now and then.
- Laser-Guided Karma: In the past, he ruined Malison Saurus' pizzeria by giving everyone diarrhea using his "Diddly Drops" prank. In the present, she and her stego-stooges finally corner Diddly and give him a well-deserved beating.
- Paper-Thin Disguise: Harold's idea of disguising him as an ordinary kid is to give him a baseball cap. Just that. George lampshades how ridiculous it is, but it's Crazy Enough to Work.
- The Prankster: He loves pulling pranks and idolized George and Harold for it.
- Verbal Tic: He ends all his sentences by scat-singing.
A Basilisk like creature from George and Harold's comic. Direct eye contact will make you barf a rainbow.
- Bizarre Sexual Dimorphism: Males have yellow eyes, dark red feathers, reddish skin, green wings and a teal tail. Females have pink eyes, brown feathers, pinkish skin, green wings and a green tail.
- Brown Note: Direct eye contact will make you barf a rainbow.
- Female Monster Surprise: Inverted. The reason why Melvin's Barfsilisk wouldn't lay an egg?Melvin: It's MALE! And it hates me!
- Real After All: Both the Barfsilisk itself and the "rock" that George and Harold paint to look like an egg.
- Voiced by: Sean Astin (Netflix Series)
- Adapted Out: He is absent in the movie, with George and Harold themselves taking up the narrator role.
- Interactive Narrator: He usually talks to the characters and they occasionally talk to him, such as George yelling at the narrator to cut it out when his narration of the Bionic Booger Boy gets too disguising.
- Saying Too Much: He accidentally lets it slip that there's more to Mr. Ree than meets the eye via Suspiciously Specific Denial.