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The Beaver
Voiced by: Max Casella
"No more music!"
A beaver who built a giant dam that ended up flooding Nowhere.
- Abusive Parents: His father wasn't very supportive of his interest in jazz music, to the point that he forced his son into abandoning his pursuits to work in construction. He's notably not happy when his son rediscovers his love for jazz music and starts performing with Courage. The beaver's mother, in contrast, loves her son and is shown to be happy for him when his love for jazz music is rekindled.
- Busy Beaver: He is a beaver who builds a dam, but this wasn't his choice since he only pursued the carreer to please his father.
- Cool Helmet: A construction helmet with a unique design.
- Half-Dressed Cartoon Animal: A little less than halfway even, seeing as he doesn't even have a shirt. Just a construction vest, gloves, and occasionally a helmet.
- Rodents of Unusual Size: Even for a beaver he's pretty big.
- "Well Done, Son" Guy: Initially only did dam work to appease his father, though obviously not happy about it. Courage re-ignites his love of jazz music.
The Dancing Rats
Two vicious rats who terrorize Courage and the Bagges during a trip to a dump.
- Acrofatic: Surprisingly good dancers considering their body fat.
- Ax-Crazy: They waste no words and go straight to the trap-setting.
- Creepy Twins: They look similar and act as a duet so they invoke this, regardless of relation.
- Fat Bastards: Their gluttony drives them to villainy.
- Red Eyes, Take Warning: One of them has red eyes. It's the least demonic thing about him.
- Rodents of Unusual Size: Big enough to see humans as a meal.
- Silent Antagonist: Neither of them says a single word.
- Stout Strength: Pretty strong for their size.
- Whole-Plot Reference: There episode is entirely a reference to The Nutcracker.
- You Dirty Rat!: They are dirty both literally as they live in a dump and in their intentions for the elderly couple.
Rumpledkiltskin
Voiced by: Alan Cumming
"Who am I? Who AM I!? Nevermind who I am!! And start yer weavin', baby!"
An odd Scottish man who tricks Muriel into coming to Scotland so she can make him kilts for his business. He also refuses to say his name and gets very angry when Courage keeps trying to discover it.
- Ax-Crazy: Crazy enough to threaten an old lady with physical harm if she doesn't comply to his insane demands.
- Beard of Evil: A big bushy red one on his diminute chin.
- Berserk Button: Hates his birth name, and in a refence to the myth of Rumelstiltskin, won't allow anyone who speaks it to remain under his roof, even if it ruins his evil scheme. Or if you're his own mother!
- Big "NO!": His reaction when Courage uses charades to teach Muriel his real name.
- Blatant Lies: He seeks out Muriel because she's the only surviving member of the Bagge's who knows the clan's unique kilt pattern. To get her in his clutches, he claims he's her "great-uncle Angus".
- Con Man: A rather convoluted one at that, going to the trouble of tricking Muriel to Scotland just to force her to make kilts.
- Delayed "Oh, Crap!": Gets one of these moments once he starts putting together exactly what Courage is Miming The Clues to put together.
- Embarrassing First Name: He is very ashamed of his name.
- Evil Is Hammy: Hair-Trigger Temper, No Inside Voice...Holy crap, is he.
- Evil Redhead: The result of being Scottish and a huge jerk.
- Expy: He's a spoof of Rumpelstiltskin.
- Fiery Redhead: Goes with his Violent Glaswegian personality.
- Hair-Trigger Temper: Pretty much anything sets him off. It's implied that his Embarrassing First Name is a bee in his bonnet.
- I Lied: When a distraught Muriel tearfully asks how her own relative could enslave her, he laughs and points out she doesn't even have a great-uncle, he just lied to get her to Scotland.
- Karma Houdini: What does he get in return for forcing Muriel into labor? Getting her as a buisness partner!
- Kick the Dog: He's at his meanest when he fires his own mother for mentioning his name.
- Stating the Simple Solution: Muriel points out that if he hates his name so much, he could just change it. Rumpledkiltskin had no idea you could do that.
- Violent Glaswegian: He's Scottish and ill-tempered.
Dr. Gerhart's House
The imposing manor Dr. Gerhart calls home, given life through his experiments with music and sound. It refuses to share its occupant with any "neighbors" despite his protests, and attacks the Bagges' farmhouse in a fit of rage.
- Anti-Villain: The house is extremely jealous of anyone who meets her owner, but in the end all she needed was some refurbishing and care to become calmer and accept the idea. She's certainly thankful to Courage after getting a make-over.
- Clingy Jealous Girl: The house is very protective of Gerhart, and will lash out at any new "neighbors" that come too close for comfort.
- Eldritch Location: A sentient house that screams in rage and is very clingy to her owner.
- Genius Loci: Gerhart gave life to his home so he could finally have someone to live with, but the house is not only extremely clingy, she's also possessive and will attack any new "neighbors" he tries to meet. The years of disrepair and lack of care with the interior probably didn't help matters, but by that point the doctor was too depressed from his enforced loneliness to notice.
- Heel–Face Turn: Once Courage and Dr. Orbinson give it a new paintjob and some refurbishing, the house calms down and stops her attack, even allowing her owner to get the neighbors he always wanted and thanking Courage for his effort.
- Hell Is That Noise: The house can vocalize its rage through female-like screaming and roaring. It thankfully soothes when she gets calmer after her make-over.
- Improbable Weapon User: The house can use its individual parts as different types of weapons and appendages, firing off its fence posts as missiles and using its weathervane as a guided rotary blade that chases down Muriel and Eustace in their basement.
Windmill Vandals
Ghostly horsemen who attack the Bagges should their windmill ever stop spinning.
- Art Shift: Not even close to cartoony as the rest of the cast. They're very detailed and anatomically accurate.
- Black Vikings: Vikings in America? In the Midwest? That farm for a living? Technically, they're not actually referred to as vikings, but it's hard to see their design as anything else.
- Cerebus Retcon: That windmill that's always by the farm apparently served no purpose other than as a visual gag. When these guys debut, we learn that it's the only thing keeping them from destroying the farm and killing the occupants.
- Dem Bones: The apparitions of the vandals and their horses manifest themselves as walking skeletons.
- Evil Is Petty: Their Ghostly Goals turn out to be destroying the business competition that they obsessed over since they were alive and, until that happens, they aren't willing to put either their vendetta against farmer Galette or themselves to rest.
- Four Is Death: Four vandals, four blades on the windmill, four magic symbols to ward them off. Their episode is heavy on the symbolism.
- Green-Eyed Monster: They bear a grudge against the Bagge Farm because the original owner broke their monopoly on milling.
- Horny Vikings: Horny Vandals, in this case. If anything, that's even more historically inaccurate. They are also decidedly more modern, as they were around a mere 250 years before the series started. The are also horseback riders, as Nowhere, Kansas is a desert, and therefore has no water for miles outside of the windpump on the farm (which is why they attacked the farm nearly three centuries ago).
- Losing Your Head: They non-fatally decapitate Courage, Eustace, and Muriel. It's unknown if this is some sort of power the Vandals have, or if it's just cartoon logic at work.
- Negative Continuity: The windmill is destroyed several times before and after their appearance, but they only show up in their featured episode. However, it may be that the windmill blades have to stop turning first for the spell to take effect, as the computer describes.
- Our Ghosts Are Different: They all look skeletal and are tied to the working of the farm windmill. If it stops, they'll come.
- Red Eyes, Take Warning: Their glowing red eyes are a sure sign that they're undead and up to no good.
- Scary Skeleton: All of them are skeletal and have malicious intentions.
Big Bayou
Voiced by: John R. Dilworth
"Hello, me. Oh, don't I look fine! I'm so beautiful."
A narcissistic snake who captured some slugs to turn his shed skins into monuments to his "beauty". The slugs then send a distress call in the form of a magically-induced cold that affects Muriel, calling Courage to help them achieve freedom.
- Accessory-Wearing Cartoon Animal: He's a snake that wears a tophat and a bowtie.
- Ambiguously Gay: He has prominent eyelashes and constantly flaunts and talks about his own beauty.
- The Fighting Narcissist: Inverted. He's so narcissistic that he can't bring himself to fight copies of himself, even when they're beating him to near death.
- Hoist by His Own Petard: Courage manages to use his own venom to reanimate the snake scarecrows he was forcing the slugs to make, then use the magic book to gain control of them and send them after Bayou. As Bayou is so vain, he can't bring himself to attack them.Big Bayou: Y-you're all me! I can't do this to me! [gets tackled]
- It's All About Me: He inserts the word "me" into almost every other sentence, so it's obvious that he only cares about himself.
- Narcissist: Dude loves himself so much that when Courage brings his skins to life and sics them on Bayou, he can't bring himself to fight his likenesses and gets curb-stomped.
- Pun: His attempt at a Pre-Mortem One-Liner:Big Bayou: As we say in the bayou, "Bye You!"
- Reptiles Are Abhorrent: A voodoo witch doctor snake who enslaved a colony of slugs.
- Shrine to Self: He enslaved the slugs just so he'd have someone to make his shed skins into tributes of himself.
- Sissy Villain: Highly effeminate, vain, and nitpicky.
- Slavery Is a Special Kind of Evil: He kidnaps and enslaves a race of talking slugs.
- Small Name, Big Ego: He is vain to the point where it's just silly, despite being nothing more than a slave driver of a bunch of slugs.
- Smug Snake: Quite literally. He does have some level of talent, but its all eclipsed by his massive ego.
- Sssssnake Talk: Exaggerated, since he drags out a bunch of letter sounds, not just the "S".
- Unusual Euphemism: "What the Bayou!?"
Everett the Swamp Monster
Voiced by: Kevin Conway
"My Swamp Woman... I lost you once, but now I'm bringing you back."
A confused swamp monster who thinks Muriel is his bride.
- The Aloner: Being without his bride for a while has made him a bit delusional and his memory a bit fuzzy.
- Captain Ersatz: Of Gill-Man.
- Character Catchphrase: "SWAAAAMP WOMAAAAN..."
- Fluffy the Terrible: A horrifying swamp monstrosity with an obsessive love for his wife... and his name is Everett, married to Catherine the Swamp Woman.
- Forgetful Jones: He's not all there when it comes to his ability to remember things. The reason he goes for Muriel as his wife is because he earnestly forgot what the Swamp Woman looked like, despite the fact she looks pretty much like him. And the reason she hasn't come back in so long is because she also forgot about him.
- Hair-Trigger Temper: He's constantly pissed off because his girlfriend left him, which leads him to cause rampant destruction in Nowhere.
- Humans Are Ugly: Catherine is horrified that her husband thinks Muriel is anything close to her in appearance, calling her "disgusting". Everett also realizes his mistake and reacts with equal disgust when he takes a better look at Muriel.
- Interspecies Romance: Downplayed, he's chasing Muriel out of a delusional belief she's his wife.
- Super-Scream: Can scream loud enough to raze entire buildings, which is exactly what he does to various establishments along the way to Muriel.
The Goat
"This place is sacred! Go ba-a-a-a-ack!"
The lone guardian of a magic spring which dried up thanks to pollution caused by humans.
- Anti-Villain: Type II: His grudge against humanity is obviously justified, but he still takes it out on poor Courage and Muriel because by that time he sees all people as the same.
- Extreme Omni-Goat: Averted. He is never seen eating, so the stereotype of goats being capable of eating anything inedible never comes up. He also doesn't eat the mountains of trash polluting his spring.
- Green Aesop: His episode gives the moral that people should not be greedy and destroy natural habitats, which is what happened to the healing spring in Mt. Nowhere.
- Humans Are Bastards: Considering what happened, you can't blame him for having an unfavorable view on humans.
- Last of His Kind: He's the only one left because the other goats that lived on the mountain were thrown off it by tourists, especially Horst.
- No-Holds-Barred Beatdown: Ironically, the brutal beating he gives Courage is what helps restore the spring.
- Red Eyes, Take Warning: He has red eyes, most likely the result of sleep deprivation and his neckache.
The Evil Carrot
Voiced by: Peter Fernandez
"Grow, expand, EXPLODE!"
An experimental missile in the form of a giant carrot that causes anyone who eats it to grow to the size of a farmhouse, then explode.
- Action Bomb: It's basically a living bomb in the form of an edible vegetable.
- A.I. Is a Crapshoot: Well, he is technically a computer going haywire.
- Botanical Abomination: It's part this and part Mechanical Abomination, since it's an artificial vegetable life that fuses to anyone who eats it and gradually increases their size until they explode. And it can reproduce.
- Character Catchphrase: "Grow, expand, explode! Grow, expand, explode!"
- Cool Helmet: He wears a combat helmet, just so you know he's military technology.
- Evil Is Hammy: Being hammy is part of his programing for some reason.
- Giant Food: His initial appearance is as a giant carrot. As in, big enough to completely cover a kitchen table.
- Mutagenic Food: Eating him causes enlargement into a giant before detonation.
- Ninja Pirate Zombie Robot: It's an Explosive Cyborg Carrot Missile.
- No Indoor Voice: He's constantly shouting.
- Taking You with Me: Its only concern is growing, expanding and exploding, and doing so will kill its host along with itself. In fact, this seems to be its primary function.
- Why Am I Ticking?: Its host will eventually explode like a nuke after a period of growing in size.
Mad Dog
Voiced by: Peter Fernandez
"I take you from a two-bit joint and make you a class act, and you want to make me second-rate?! If I even SMELL Kitty, I'll bury the two of ya!"
A sociopathic Doberman and Bunny's ruthless, controlling boyfriend who is extremely hostile towards her - purely because of her association with Kitty.
- Angry Guard Dog: A savage Doberman, but the trope is downplayed in that he's guarding Bunny from her friend.
- Bait-and-Switch: The threat in his quote sounds quite menacing until the reveal that his meaning isn't a Deadly Euphemism. However, given how much of the episode does use euphemism for relationships and relational abuse that can't easily be covered on children's television, and Bunny's repeated cries for Mad Dog and his gang to let go of her, it's possible that what was shown and heard was still meant to imply something else.
- The Brute: He relies almost purely on his muscles. His profession doesn't have much need for any other skills.
- Crazy Jealous Guy: Threatens to bury Bunny and Kitty if he even smells the latter around, which seems to add even more credence to the interpretation that Kitty and Bunny might have feelings for each other. Of course, considering Kitty's tried to get Bunny to leave him, and isolating one's victim is a standard tactic in the abuser's playbook, it's also very likely that he's trying to keep them apart so Kitty can't help Bunny.
- Does This Remind You of Anything?: The episode has a lot of focus on atmosphere, and Mad Dog's presence escalates it a little above your usual kids show premise, especially since other than the fact he's an anthro dog, virtually nothing about him is fantastical or Played for Laughs, and his abuse of Bunny is played distressingly close to reality. Not only that, her backstory with Kitty and his talk of turning Bunny into a "class act" invokes the theme of prostitution, and hints at this being a case of an abusive jackass who got severely angry that his supposed girlfriend might like her "friend" a little more.
- Dogs Are Dumb: As cruel as he is, he isn't very bright.
- Domestic Abuse: What he does to his girlfriend Bunny. And the way it's depicted is disturbingly realistic.
- Dumb Muscle: More brawn than brain and yet he is no stranger to emotional manipulation.
- Evil Is Hammy: His tone is always loud and dominating.
- Evil Sounds Deep: He has a deep voice.
- Gangbangers: His gang are a bunch of lowlife punks who do dirty jobs for money. This doesn't prevent him from having a high opinion of himself and their lifestyle.
- Half-Dressed Cartoon Animal: Wears a white tank top, but no pants.
- Hate Sink: Mad Dog is a disturbingly realistic take on a Domestic Abuser who threatens to kill Bunny and her friend Kitty if he sees them together again and he attempts to mow Bunny and Courage down with his car when Courage helped her to escape. The show very much does not sugarcoat the message that people like Mad Dog are not someone the audience should want in their lives.
- Jerkass: A disturbingly realistic jerk too, which makes him stand out. Threatening Bunny with violence if he even smells Kitty further cements this.
- Meaningful Appearance: He wears a type of sleeveless shirt colloquially known as a "wifebeater", fitting for an abusive boyfriend.
- Mundanger: Aside from being an anthropomorphic dog, there's really nothing fantastical about him. He's just a scarily realistic portrayal of a gangster and a domestic abuser. He's probably lucky that his defeat was ultimately cartoonish.
- Red Eyes, Take Warning: Has red eyes that make him even scarier.
- Running on All Fours: Does this when he wants to run quickly.
- Spikes of Villainy: Wears a spiked dog collar.
The Evil Empress
Voiced by: Winnie Chaffee
Di Lung's aunt, who happens to be a Chinese empress. She desires a truly innocent person's (Muriel's) bones to grind up into a concoction that'll restore her fading power.
- Alliterative Name: Her title is an alliteration, anyway. She's not given a proper name.
- Amazing Technicolor Population: Her skin is a pale green color.
- Anachronism Stew: The Chinese monarchy has been abolished since 1911, so she shouldn't exist.
- Aristocrats Are Evil: Along with her nephew, she is a blue-blood nightmare.
- Asian Rudeness: Though she doesn't interact much with her victims, politeness isn't really her strong point.
- Evil Laugh: Her laugh becomes distorted when she goes for the kill.
- Evil Sorceress: She has some magic powers, such as levitation and laser beams.
- Evil Twin: It turns out that she stole the throne from her sister, the Good Empress, who retakes it after Courage defeats the Evil Empress.
- God Save Us from the Queen!: Anyone would need to be saved from such a wicked queen.
- Green and Mean: She has visibly green skin (as well as green-themed powers), and is very wicked.
- Lady of Black Magic: An empress of China able to cast magical lasers.
- Lean and Mean: Very thin, and very evil.
- Pimped-Out Dress: An imperial garb and matching hat to fit with her position.
- Taken for Granite: Courage sending her lasers back at her turns her to stone and explodes her in midair.
Shirley's Giant Starfish
A giant monster created by a curse cast by Shirley when Muriel refuses to speak after an argument with Eustace. It will only stop its rampage when she speaks once again.
- Batman Gambit: Courage finally realizes that if she won't talk because of Eustace, she'll talk for him instead, deliberately placing himself in the monster's path so Muriel will scream and rush to his defense.
- Curse Escape Clause: It only stops its rampage when Muriel finally speaks again.
- Eldritch Abomination: What is it exactly, beyond a giant starfish that eats cities and won't stop until it hears Muriel speak? Where did it come from? How can Shirley control it? It's impossible to say.
- Starfish Alien: Whatever this thing is, it looks exactly like a starfish down to the podia underneath it. Except this one roars and is big enough to wipe Nowhere off the map just by crossing it.
- World-Wrecking Wave: That's what it basically is in monster form.
Jojo the Dolphin
A cocky dolphin that goes against Eustace in a set of competitions, as a result of Eustace's claim that he can do better than him.
- Cheaters Never Prosper: While they win the first round fairly thanks to how badly Eustace does, the rematch sees Jojo and his trainer play dirty against their improved opponent, as evident when the trainer smacks Eustace when he is in the lead. Courage's efforts to help motivate Eustace result in the two of them getting hypnotized and morphed into weaker beings that can't win even with cheating.
- Cool Shades: The Trainer wears cool sunglasses.
- Devious Dolphins: Jojo is most certainly NOT a Friendly, Playful Dolphin.
- Forced Transformation: When Courage attempts to hypnotize Eustace to be even better, during their rematch, he instead hypnotises Jojo and his mentor, causing them to burst like a cocoon and become a guppy and a newt respectively.
- Inelegant Blubbering: Jojo cries after Eustace bests him in their contest.
- Sapient Cetaceans: Jojo can use his flippers and flukes to play instruments, climb on rings, throw basketballs, and even give autographs.
- Shout-Out: Wetworld is this to Seaworld.
- Smug Snake: Jojo is insufferably smug and smarmy. It really says something when you're so stuck up that Eustace looks sympathetic by comparison.
- Triangle Shades: The Trainer's sunglasses are triangular.
William the Dragon
"I WOULD eat you, if I could fly..."
A dragon that eats Eustace alive and tries to do the same to Muriel, except he can't fly or do what other dragons are capable of (like spitting fire). Courage tries to help him rediscover himself, lest he and Muriel get eaten too.
- Evil Brit: Subverted. He has the accent, but he's not really a bad guy.
- Long-Lost Relative: He has a brother that is also a water dragon, whom he reunites with at the end of his episode.
- Our Dragons Are Different: Turns out, the reason he can't fly is because he's a water dragon who got separated from his family as a baby, and was raised by flying dragons.
- To Serve Man: Well, he is a dragon. Subverted in that he was just going along with what his foster family does. When he tastes fish for the first time and likes it, he admits he didn't really like the taste of humans.
Son of the Chicken from Outer Space
The son(s) of the villain from the pilot of the series. They are conjoined triplets who have 3 heads consisting of a leader, the smart one (who tends to flash a camera), and an idiot one. They are sent down by their mother to Nowhere to take revenge for the death of their father by killing Courage. If they don't kill him, they are told that they can't come back home.
- Accessory-Wearing Cartoon Animal: One of the heads wears glasses. All of them wear a camera.
- Avenging the Villain: They were sent by their mother to avenge their father's death. However, it later turns out that they desire to return home more than getting revenge.
- Conjoined Twins: Or triplets. Three heads sharing the same body.
- The Ditz: The middle head is very stupid.
- Feathered Fiend: They're the son(s) of a rather evil chicken after all.
- Fish Eyes: The middle head's eyes aren't looking in the same direction.
- Heel–Face Turn: After Courage decides to help them out, they become good.
- Red Eyes, Take Warning: They have red eyes.
- Shout-Out: Ed, Edd n Eddy possibly. Courage's solution to their problem also glens a bit from White Men Can't Jump.
- The Smart Guy: The right head is the most intelligent of the three.
- Smart People Wear Glasses: The right head wears glasses and is the brains of the outfit.
- Toothy Bird: Apparently a trait of their species is to be birds with teeth.
- The Voiceless: None of the heads spoke a single word throughout the entire episode.
The Creature in the Wall
Voiced by: Tom McKeon
"All this callous, selfish behavior...! People selling themselves! Their talent, their art... for fame and fortune! It makes me... SICK."
A vast subterranean organism who lives in a large cabaret under Hollywood, which is largely encased in his own tissues. After the Bagges fall down what appears to be his throat, they are ordered to entertain him with promises of great rewards, while also under threat of death from his bodily functions.
- Artist Disillusionment: In-universe, as he was once an entertainer himself, but became disgusted at seeing other artists selling themselves out solely for fame and fortune rather than just doing it because it bought them joy. So much so that he somehow became an ulcer in his own stomach.
- Because You Were Nice to Me: The Creature finally learns to embrace optimism and be a better person again after Courage goes out of his way to save his owners, then the Creature himself when his heart suddenly stops.
- Blob Monster: He's essentially a giant talking ulcer stuck to a fleshy stomach wall that is now an entire cabaret.
- Body Horror: He was formerly a guy whose body somehow turned inside out and consumed an entire theater.
- Body Motifs: In play mostly because the entire theater is the body of what Was Once a Man. He makes several mentions of both his stomach and his heart, which now exist as part of the theater itself, and makes several other body-related terms to show his displeasure.
- Caustic Critic: Exaggerated, since he actually kills acts that displease him.
- Character Tics: He convulses in pain when he's displeased, as if complaining about a harsh pain in his body. He also enlargens his eyes when he's emphasizing his points.
- Evil Cannot Comprehend Good: Downplayed (and for lack of better words), as it's been so long since since he's seen someone like Courage only wanting something like his family back that couldn't tell how serious he was until he put in the effort.
- Genius Loci: The cabaret he inhabits is made of his own body, so he can control most of it himself.
- Hollywood Acid: What was once a man's stomach is now concealed by the cabaret's stage, the certain doom waiting for any entertainer that displeases the organism. Even more fitting, since this episode takes place in Hollywood.
- Human All Along: This creature was once an entertainer whose contempt for the greed and materialism of others caused him to become a monster.
- Secret Test of Character: What his cabaret ultimately is, testing entertainers by baiting them with luxurious rewards and superficial promises of fame before sending them to be digested. He's not too concerned whether the acts are good or bad, the mere fact they're taking his offers is an insult to his patience. Courage only manages to make him stop and become human again by showing actual kindness, both to his owners and the man the Ulcer once was by saving their lives.
- Womb Level: Because of his disgust with artists seeking only fame and superficiality, he became a tumorous ulcer and his inner body was spread across an entire theater under Hollywood, the walls becoming his flesh and his stomach now hidden under the stage to punish any new acts that displease him. Even his massive heart is now a fixture under the main showroom floor.
The Librarian
"SHHHH!"
A mysterious old librarian who curses the Bagges due to an extremely overdue library book. Unless Courage can pay the return fee, Muriel and Eustace will remain cursed, becoming characters from the book and fighting each other.
- Achilles' Heel: The overdue return fee will just keep growing and growing as part of the curse she casts, but she's still bound to the exact price showing on the reader. Courage slamming her stand in frustration causes it to drop to just a single cent off what he made previously, making it possible for him to clear the debt for good.
- Becoming the Costume: The Librarian curses Muriel and Eustace into becoming the characters of the book Courage failed to return, causing them to chase each other into dangerous situations neither of them is safe from. The curse will only stop when Courage pays his overdue return fee.
- Four Eyes, Zero Soul: A glasses-wearing Scary Librarian who charges exorbitant overdue fees and curses you if you don't pay up.
- Lean and Mean: Impossibly thin, and way crueler than a librarian ought to be.
- Magic Librarian: She casts a curse on the overdue library book, so Eustace and Muriel get paper-cuts from it, and they transform into characters from the book.
- Mouth of Sauron: The lion statues in her library speak with ominous tones of voice in her stead.
- Scary Librarian: Return your book in time and pay your fee... or else.
- The Silent Bob: She doesn't speak, but her ability to make her point is helped out by the signs around her and two talking lion statutes.
- The Voiceless: With the exception of shushing Courage when he's too loud, even though the "library" is more of a roadside stand, and there's nobody else around, meaning that the librarian is either incredibly sensitive to loud noises, or is just a massive Jerkass.
The Cruel Veterinarian
Voiced by: Peter Fernandez
"May I talk with the two of you for a moment? In... PRIVATE!"
Quite possibly the worst villain of the entire series, he stands out as Courage's biggest nightmare. Why? This screw-loose "vet" came up with a horrible idea back when Courage was a puppy - abduct dogs and rocket them off to the moon to make them into super breeds of space dogs. Tragically... He captured Courage's beloved mom and dad, and Courage himself, with plans to send them into space. Although Courage's parents came to the rescue, the doctor sealed them up in a rocket with a one-way trip to the moon in store. Courage was too terrified by this predicament to do anything but escape harm through a garbage chute, only to watch his parents be catapulted into space - in tears. Fortunately, a younger Muriel discovered the young pup in the dumpster and gave him a happy home. Many years later, the maniac doctor, albeit considerably older and balder, still continues his twisted plans... but now Muriel and Eustace get trapped in a rocket themselves.
- Aborted Arc: Officially set up a storyline that would've brought the show's biggest question to resolution: Will Courage reunite with his long-lost parents? Because his debut episode was the very last of the series, this will never be resolved.
- Arch-Enemy: The ACTUAL one to Courage, and the bane of his existence.
- Asshole Victim: Sent to space and viciously mauled by his previous victims.
- Bald of Evil: He was already balding when Courage first met him as a pup, but the rest of the Vet's hair had fallen out by the time they next meet - which makes him look far scarier than we first saw him.
- Batman Can Breathe in Space: He is eventually blasted off to the moon himself and suffers no ill effects when he emerges from the rocket and finds all of the pissed-off dogs he's sent there.
- But for Me, It Was Tuesday: Averted. He actually ends up remembering Courage from when he was still just a puppy.
- The Cuckoolander Was Right: Sending dogs to the moon to make them super-dogs sounds insane and stupid. Turns out it technically works. Unfortunately for him it means he's trapped on the moon with a colony of super-strong dogs that are all extremely pissed at him.
- Ear Ache: Courage disorients him by screaming into his stethoscope.
- Evil Old Folks: One of the most evil characters in the series and no spring chicken.
- For Science!: His primary motive is to do what he does to advance science, to hell with the unethical problems that may come up.
- Four Eyes, Zero Soul: He wears glasses and has absolutely no soul at all.
- Greater-Scope Villain: Remember every villain ever portrayed on this show and how Courage is often scared to death of them? This guy is the one who directly traumatized Courage as a child. He is the true villain of the entire series.
- Hate Sink: He was the one who kidnapped Courage's parents, and kidnapped many more dogs, sending them to the moon for an experiment. The consequences of his actions led Courage to be completely isolated by any care or love until Muriel found him. And unlike most villains in the series, he has no cool qualities and his cruelty is played very seriously, cementing himself as a horrible man and one of the most hated villains in the series.
- Hoist by His Own Petard: His own rocket and every dog he ever sent to the moon end up becoming his undoing.
- Insane Troll Logic: Apparently sending a dog to the moon makes it strong. Well, considering what happens in the ending...
- Jerkass: He's as unpleasant as he is evil.
- Karmic Death: Maybe, maybe not. It's ambiguous whether or not the dogs on the moon killed him, but either way he finally got what he deserved in the end.
- Laser-Guided Karma: After sending Courage's parents along with many other dogs to the moon. He ends up being sent to the moon by Courage nonetheless with all the other dogs he sent there waiting.
- Mad Doctor: Calling him a "veterinarian" is stretching the term to its breaking point, since he deliberately sent Courage's parents into space.
- Mad Scientist: He tries to make a race of super dogs by sending dogs into space.
- No Name Given: Didn't have a name; of course, he sticks out so well amongst Courage's rogues gallery, he doesn't really need one.
- "Oh, Crap!" Smile: He makes one when karma is about to bite him in the ass — literally!
- Red Eyes, Take Warning: Has blood red eyes, as shown when his goggles are taken off, and is the only human character in the show to have them. Even when his goggles are on, you can still see tiny red dots in the middle of the lenses if you look closely.
- Small Role, Big Impact: Him sending his parents off to space made Courage so overprotective of Muriel.
The Perfectionist
Voiced by: Gerrianne Raphael
"And do it perfectly!"
A perfectionist teacher-like figure who shows up in the Bagges home out of the blue and forces Courage to be her student, teaching him to be arbitrarily "perfect" no matter how much suffering it brings him.
- Berserk Button: She absolutely detests anything flawed, even in the slightest.
- Character Catchphrase: "Do it perfectly!"
- Character Tic: She tends to smack her ruler against whatever hard surface is at hand whenever she tries to make a point. After Courage defies her and accepts himself, she smacks the ruler hard enough that it shatters to bits.
- Control Freak: If it's not perfect according to her arbitrary, highly-specific standards, then it's nothing short of a disgrace. She puts Courage through one hell of a "study session" just so he can learn to be "perfect".
- Department of Redundancy Department: The perfectionist teacher's last line as she melts into nothingness: "Now you'll never reach the perfect level of perfection!"
- Evil Brit: Her British accent fits into her "strict schoolmaster" theme.
- Enemy Within: The episode doesn't go out of its way to say what she really is or if she's real or just imaginary, but given the fact that she's never seen interacting with either Muriel or Eustace, shows up not too long after Eustace belittles Courage for his "imperfection", and only seems to be around Courage anytime she's on-screen, it's heavily implied she's a manifestation from Courage's mind, hallucinated or made real, torturing him as part of his low self-esteem and want to be perfect... even if it ends up hurting himself.
- Evil Is Hammy: Her melodramatic personality is just one of the many things that make her unpleasant.
- Evil Teacher: She approaches Courage, and strictly trains him into becoming a perfect dog.
- Final Boss: Technically the last villain faced in the show, although she was just another minor one-shot antagonist. Could count as the Post-Final Boss in a sense, given what the penultimate villain meant to the entire series, and how her appearance wraps up the last couple loose ends of Courage's self-doubts and insecurities.
- The Heartless: She's the manifestation of Courage's self-esteem issues and lack of confidence.
- I'm Melting!: After Courage defeats her, she melts into a puddle.
- Jerkass: Repeatedly tells Courage that his ways are not perfect in cruel, belittling ways, not offering any constructive criticism besides giving him instructions and just expecting him to do it right the first time.
- Last Episode, New Character: She appears in the final episode of the series as the last villain faced by Courage.
- The Perfectionist: She won't stand anything being imperfect. On Cartoon Network's online episode viewer, in the episode's description, she was even named "The Perfectionist." It is unknown if that is her actual name.
- Rage Breaking Point: Once Courage makes a drawing that he folds to form a number six, she finally snaps, smashes her ruler into bits and rants about that "imperfection" while yanking her hair, melting into a puddle as she does.
- Sadist Teacher: Her goal is to mentally break Courage into "perfection".
- Shout-Out: Towards the end, her death is a nod to the demise of the Wicked Witch of the West from The Wizard of Oz.
- The Spook: She appears out of nowhere to give Courage lessons, and only he appears to be aware of her existence. It's one of the indicators that she's a figment of his imagination.
- Stern Teacher: Carries herself as a particularly unsympathetic example of this.
- Villainous Breakdown: When Courage manages to make something that is both perfect and imperfect at the same time (perfect in that it's accepting himself and imperfect as he doesn't do as she wanted him to), she keeps shouting 'that's not perfect!' over and over, breaking her facade of control and slowly melting down into nonexistence.
- Perfectionist: AAAAHHHH!!! (smacks ruler on Courage's desk, breaking it) That's not perfect! (starts pulling her hair and, at the same time, melting) You rotten, imperfect dog! (as her voice gets deeper and distorted) Now you'll never reach the perfect level of perfection!"
- Wicked Cultured: A highly refined charm school teacher. And an evil manifestation of self-doubt.
