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Section about the minor KND villains.

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    Laura Limpin 
Laura Limpin aka The Big Badolescent

An adorable young girl who, whenever angered, transforms into a monstrous teenager. Voiced by Grey DeLisle as Laura and Dee Bradley Baker as The Big Badlosecent.

  • Ambiguously Brown: Her skin is brownish, but it's unclear if this is to indicate her ethnicity.
  • Back for the Finale: After only appearing in two episodes of the first season, she returns in the Grand Finale "Operation: I.N.T.E.R.V.I.E.W.S."
  • Beware the Nice Ones: Laura is unassuming enough, but her alter ego is not something to be messed with.
  • Beware the Silly Ones: Taking one look at her, you'd hardly believe she's as dangerous as she really is. But when she hulks out...
  • Does Not Like Spam: Hates coconuts.
  • Eye Glasses: Mild-Mannered Laura has glasses that change shape to match her emotions.
  • Girlish Pigtails: Both forms have pigtails.
  • Girl Scouts Are Evil: She's a member of the Skunky Scouts.
  • Hulking Out: When she gets angry (or upset...or mildly annoyed) she turns into a horrific, monstrous teenager, twice as tall and three times as big. Fortunately, she turns back to normal rather easily.
  • Hulk Speak: The Big Badolecent speaks in third person and in incomplete sentences.
  • Power Echoes: In the Swedish dub.
  • Super Strength: The Big Badolecent is one of the strongest characters in the series, effortlessly beating the tar out of any character it meets.
  • Starter Villain: The very first threat fought on the show, not counting the pilot episode.
  • Teens Are Monsters: Granted that her alter ego is one.
  • Unstoppable Rage: Downplayed; she's a rampaging monster when she's angry, but she's pretty easy to placate.
  • You Won't Like Me When I'm Angry: She becomes an acne-ridden behemoth when enraged.


A man who has been seen conducting various money-making operations at the expense of children. Voiced by Tom Kenny.

  • Bald of Evil: He's bald to the point where he almost resembles Dr. Eggman with his mustache.
  • Cast as a Mask: "Operation: S.A.F.A.R.I." has him pretend to be a doctor named Julius B. Sharp, who is voiced by Jess Harnell before his true identity is revealed.
  • Fat Bastard: He's overweight and a greedy jerk.
  • Greed: His evil plans usually involve money.
  • Human Resources: He opened a restaurant that made children into burgers for sharks in "Operation: F.A.S.T.-F.O.O.D."
  • Hunting the Most Dangerous Game: One of his plots revolved around hunting children with a rifle that shoots syringes that turns them into moose. This turns out to be a nightmare Numbuh 1 is having.
  • Jerkass: Not one redeeming value was ever shown for Chester, which is all well because he's tried to outright get children killed to line his pockets, with no discrimination between Kids Next Door or innocent.
  • Knight of Cerebus: Though not as evil as Father, Chester's acts of villainy are generally portrayed in a worse light than other villains. Doesn't help that episodes focusing on him tend to be more psychologically disturbing.
  • Lotus-Eater Machine: In "Operation: U.T.O.P.I.A.", he trapped Numbuh 1 in a machine he designed for parents to put their kids in, which would render them all happy and docile. The machine creates a virtual paradise for the wearer.
  • Mad Doctor: His alias as Dr. Julius B. Sharp in "Operation: S.A.F.A.R.I.", since he used inoculations to turn children into moose so he could saw off their antlers and use them to make an ice cream product known as Moosicles.
  • Mad Scientist: He occasionally facilitates his schemes using his own bizarre creations and inventions.
  • The Sociopath: Despite his status as a minor villain, Chester's level of depravity manages to rival that of Father, if not worse. Many of his schemes are illegitimate businesses that involve severely injuring or even killing children (KND or innocent, he doesn't care) all for a quick buck.
  • Summer Campy: In "Operation: C.A.M.P.", he ran a camp so he could brainwash children into making him lanyards and wallets to sell for profit.
  • Vile Villain, Saccharine Show: Most KND villains either have some redeeming qualities or are Laughably Evil, but Chester's schemes involve seriously injuring or killing children for profit.
  • Would Hurt a Child: Most KND villains are willing to do this, but he's notable for being one of the few villains that goes after completely innocent children instead of merely KND agents.
    • Notably, unlike some villains who just detain or capture children for being a nuisance, Chester outright tries to set up a burger chain that feeds children to sharks so he can profit off it.

    Common Cold 
Common Cold

An eternally diseased villain who wishes to spread his cold to everyone else in the world. Voiced by Tom Kenny.

  • Artistic License – Medicine: As stated below, one of the Common Cold's weaknesses is Vitamin C, which is found in orange juice. However, Vitamin C does neither treat nor cure the common cold in real life.
  • Evil Is Hammy: He tries to be with dramatic phrases and speeches, but ultimately fumbles thanks to his cold.
  • Evil Uncle: In Operation S.N.OW.I.N.G., he is revealed to be the uncle of Anna Worthington, secretary of James Nixon McGarfield.
  • Jerkass: Unlike most other villains, he doesn't get any other episodes to have a significant appearance in as anything other than a comedic Butt-Monkey, leaving his only major appearance (outside of Operation: V.I.D.E.O.G.A.M.E.) as betraying Tommy after a brief Enemy Mine and attempting to hit the whole world with the flu. This makes him one of the few antagonists in the series that never really gets any lighter shade to his objectives.
  • Meaningful Name: He's constantly under the sway of a common cold. Which he has weaponized. It's exactly as disgusting as it sounds.
  • Plague Master: Has successfully weaponized his own cold.
  • Precision F-Strike: His voice actor slipped in a subtle and low swear when he's baffled by Numbuh 2's mother pulling out chicken soup.
  • Weaksauce Weakness: Owing to his "powers", he can easily be disabled by classic home remedies like chicken soup or orange juice.

    Mr. Fizz 
Mr. Angelo Fizz

The head of the Soda Control Board, who has attempted to outlaw soda consumption by anyone under 13 years of age. Voiced by Jeff Bennett.

  • Archenemy: He has a particular vendetta against Numbuh 2, due to him being the primary soda smuggler for those under 13. The two episodes where he was the main villain also had Numbuh 2 as the primary protagonist.
  • Child Hater: Like most villains in the series. His particular gripe stems from what he see's as their inability to control their consumption of soda (which is rather rich considering he's practically a soda addict himself).
    Mr. Fizz: Children. If only you could bottle their delightful precociousness. Until they've grown up.
  • Edible Ammunition: Has a multitude of gadgets from guns to tanks to Powered Armor, all of which uses soda as its main ammunition.
  • Final Boss: He is the last and only boss fought in the Game Boy Advance game Operation: S.O.D.A.
  • I Need a Freaking Drink: G-rated version but whenever he gets stressed, he tends to steady himself by drinking copious amounts of soda. Considering an offhand line he gave about trying to keep from drinking too early, he's basically the soda equivalent of an alcoholic.
  • Lean and Mean: He's thin and not a nice guy.
  • No Celebrities Were Harmed: He's an Expy of Ricardo Montalbán, for some reason; he even wears a white suit like Mr. Rourke.
  • Sinister Shades: He wears opaque, purple sunglasses.
  • Soda Can Shakeup: How he's defeated in his first appearance. His suit of armor uses soda as its weapon which means if he's subjected to too much shaking, the carbonation of the soda will build up until his suit explodes.

    Count Spankulot 
Count Spankulot

A vampire who spanks naughty children. Voiced by Daran Norris.

  • Anti-Villain: He only spanks children who deserve it. Though Subverted in that a lot of the time he does it over minor offenses like keeping a library book a little too long. He will immediately stop and leave once he considers a debt repaid however.
  • Ascended Extra: Debuted as a throwaway villain in "Operation C.A.N.N.O.N.", with about 30 seconds of screentime. Later seasons gave him two spotlight episodes (three if you count "S.P.A.N.K.E.N.S.T.I.N.E.").
  • Brought to You by the Letter "S": Literally. He wears a medallion around his neck with the letter "S" on it.
  • Card-Carrying Villain: Initially subverts this in his first two appearances, believing he's justified in spanking children over minor offenses. By Operation L.O.C.K.D.O.W.N. he refers to his own powers as "evil" showing he now embraces his role as a villain and enemy to the KND; even attending the Villains Choice Awards and shopping at Villain-Mart. This is likely due to him being betrayed by Sector V and being put in prison.
  • Crouching Moron, Hidden Badass: He's one of the less cold-blooded villains, occasionally bordering on Minion with an F in Evil, but piss him off and he will destroy you. Best displayed in "Operation: S.P.A.N.K.", where he destroys Mr. Wink and Mr. Fibb's latest mecha just by thinking it.
  • Even Evil Has Standards: He may be a spank-happy vampire who loves what he does and does what he loves, but he only does it as a form of punishment for naughty children. In "Operation: S.P.A.N.K." he insists that he would never knowingly give an unwarranted spanking, and was borderline traumatized when he had been tricked into spanking an innocent child.
  • Friendly Enemy: He can be downright friendly when he's not punishing naughty children. In "Operation: S.P.A.N.K.E.N.S.T.I.N.E", he saves Numbuh 2 from Mushi's crayon barrage and later enjoys ice cream sundaes with Numbuh 2, Numbuh 3 and their families.
  • Friendly Neighborhood Vampire: He tries to be this in "Operation: S.P.A.N.K.", but fails miserably.
  • Laser-Guided Karma: Invoked. He inflicts physical punishment on children who commit wrongful acts, sometimes even adults.
  • Leitmotif: An Ominous Pipe Organ plays in every scene he's in.
  • Not-So-Harmless Villain: Generally speaking he's only a threat in the physical sense and the spanking he does, while painful, is typically an annoyance at worst. He gets led around by the nose and outdone in battle so much that he's almost a Minion with an F in Evil. Then "Operation L.O.C.K.D.O.W.N." happened, where he transformed all of Sector V except Numbuh Five into spank-happy vampires.
  • Our Vampires Are Different: He's a "spank-happy" vampire, who punishes bad children and spreads vampirism by removing his gloves. He's also shown some classic vampire abilities, such as hypnosis, flight, and limited telekinesis, as well as sharing the traditional weakness to garlic. It appears he doesn't need a Vampire Invitation to enter homes and spank children, though.
  • Pointy Ears: Bat-like pointy ears.
  • Punch-Clock Villain: He never spanks a child who doesn't deserve it (at least in his eyes), and can be pretty friendly when he's "off the clock" and not punishing anyone.
  • Power Limiter: The gloves he wears are to prevent him from turning the people he spanks into vampires.
  • Vampire Vords: In shameless Bela Lugosi tradition.
  • Villainous Rescue: In "Operation: S.P.A.N.K.E.N.S.T.I.N.E", when Mushi is throwing a hail of sharp crayons at Hoagie, Count Spankulot appears, re-absorbs his spanking power from the Posh Party Rainbow Monkey and spanks her hard enough to make her run off crying.
  • Villains Out Shopping: In some episodes, he can be seen attending the Villains Choice Awards and shopping at Villain-Mart. He also has dinner with Numbuh 2's and Numbuh 3's families in "Operation: S.P.A.N.K.E.N.S.T.I.N.E".
  • Well-Intentioned Extremist: Only spanks kids who have done something bad, though he often does it over very trivial things (see Anti-Villain).
  • Would Hit a Girl: He will spank girls and boys alike. He has spanked Numbuh 3 and 5 during his confrontations with Sector V, and delivered a spanking to Mushi near the end of "Operation: S.P.A.N.K.E.N.S.T.I.N.E".

Lou Pottingsworth III/Toiletnator

"Kids Next Door, prepare to be flushed!"

The most incompetent villain in the world, Toiletnator gets no respect from the Kids Next Door or his fellow villains. Voiced by Dee Bradley Baker.

  • Adaptational Badass: Most pathetic villain on the show, but he's the Final Boss on Numbuh Ones level on the "Operation: S.T.A.R.T.U.P." online game, and arguably the hardest.
  • Affably Evil: He's a pretty nice guy trying (and largely failing) to be a villain.
  • Arch-Enemy: He sees Numbuh 4 as his "greatest enemy." Might be reciprocated as of the Galactic Kids Next Door teasers, when Numbuh 4 specifically mentions Toilenator as one of the villains he wishes to fight in space. Turns out he's his uncle.
  • Ascended Extra: He first appeared being rejected by the Delightful Children in "Operation: N.O.-P.O.W.U.H." His appearance there was originally intended to be a one-off gag, but he became a recurring character in subsequent seasons.
  • Awesome Mc Coolname: This is about the only thing he gets right.
  • Berserk Button: In "Operation: C.A.N.Y.O.N.", he gets really pissed off when the Kids Next Door make one too many cracks about how he fails at being a real threat.
  • Butt-Monkey: Hardly anything goes right for this guy, especially when he tries to prove to his fellow bad guys that he can be a serious threat.
    • In "Operation: M.O.V.I.E.", he gets violently crushed in the reel of a movie projector after his toilet paper gets tangled up in its spool. Somehow, he not only survives this but also comes out in one piece!
    • In "Operation: F.L.U.S.H.", he accidentally sabotages the other villains' invasion of Sector V's base due to mistaking them for Sector V in disguise and ends up receiving the beating of a lifetime when the real Sector V show up.
    • In "Operation: C.A.N.Y.O.N.", he hears about the Kids Next Door's plan of celebrating their anniversary by filling the Grand Canyon with Rainbow Munchies cereal and sees this as an opportunity to thwart the Kids Next Door singlehandedly and get the respect he deserves. He suffers a lot of injuries on his journey and unintentionally thwarts Mr. Boss's attempt at a sneak attack in his submarine when he uses his flushing-based powers to get rid of the milk and cereal in the Grand Canyon. By the end of the episode, he gets chased by Mr. Boss and the other villains.
  • Card-Carrying Villain: In an interesting twist, he is trying to be this. He never can seem to cut the mustard, though.
  • Child Hater: For whatever reason, he hates children just as much as, if not more than, the other villains in the series.
  • Continuity Snarl: His backstory from the comics ( including being Numbuh 4's uncle) wouldn't seem to match up with a brief glimpse of his parents in "Operation: C.H.O.C.O.L.A.T.E." where they're dressed in similar costumes to him. Of course, that was likely for the sake of a gag.
  • Corrupt Corporate Executive: The 19th issue of Cartoon Network Action Pack established in the story "Operation: H.I.S.T.O.R.I.E." that he was originally an ad exec selected by Father to manufacture foul-tasting vegetables.
  • Crouching Moron, Hidden Badass: He's show several signs of this through the series... Idiot though he may be, this does still apply.
    • "Operation: F.L.U.S.H." — He takes out five other villains thinking they're KND operatives in disguise. Of course, the five villains in question had just successfully taken over the Sector V treehouse, and then (just as he thought how could things get any worse) Numbuhs 1-5 (The actual members of Sector V who have been all excused from school early) show up and kick his butt. He's even stupider than we thought.
    • He does however do pretty well when Citizombified by Grandfather. He manages to transform Mr. Boss, Crazy Cat Lady, and the Tommy without any help, and even manages to track down and chase Numbuh 1 through his own house.
  • The Ditz: Not very bright, to say the least. In "Operation: F.L.U.S.H.", Mr. Boss mentions that he once let Numbuh 1 into their lair just because he wore a T-shirt saying "I am not Numbuh 1". The Toiletnator apparently bought it because he didn't think an article of clothing could lie.
  • The Dragon: In Operation: Z.E.R.O.., the Big Bad Grandfather uses him as an active agent of the Senior Citizombification to infect living humans all over the world.
  • Dramatic Irony: In "Operation: M.O.V.I.E.", during a secret villain meeting, he suggests that they capture Numbuh 4 because he's the stupidest member of the KND...unaware that he's being even stupider because he fails to recognize Numbuh 4 sitting right next to him wearing a Paper-Thin Disguise.
  • Dude, Where's My Respect?: He's treated like a joke by the KND and fellow villains alike, even though he is actually competent enough to stomp 5 other villains at once and take over KND headquarters. The biggest problem is that he's a moron with very little common sense.
  • Evil Uncle: The comic story "Operation: H.I.S.T.O.R.I.E." establishes that he is the long-lost twin brother of Numbuh 4's father Sydney Beatles, making him Numbuh 4's uncle.
  • The Friend Nobody Likes: None of the other villains have any respect for him, on account of how clueless and annoying he can be.
  • Friendly Enemy: He was friends with Numbuh 4 for awhile ("Operation M.O.V.I.E."), and joined the announcers in the finale. Though, in the CM/HB example he referred to Numbuh 4 (actually Knightbrace) as his arch-nemesis. Gets kinda weird when it's revealed in a canon comic that he's Numbuh 4's uncle.
  • Granola Guy: Likes vegetables, hates meat. Largely because they're better for your digestive system.
  • Harmless Villain: For the most part, he's an inept clown who completely fails to be a threat toward the Kids Next Door in any way.
  • Improbable Weapon User: His theme is toilets, leading him to wield anything from plungers to rolls of toilet paper to urinal cakes as weapons... with surprising effectiveness at times.
  • Ineffectual Sympathetic Villain: Very ineffectual, very sympathetic. Except when he is kind of effective.
  • Long-Lost Relative: It is revealed in the comic story "Operation: H.I.S.T.O.R.I.E." that he is actually the long-lost twin brother of Numbuh 4's father Sydney Beetles.
  • The Millstone: On more than one occasion, he's hindered the other villains' operations just by being there. Mr. Boss tries to leave him out of his schemes, but he just can't seem to get rid of the guy.
  • Not-So-Harmless Villain: In spite of usually being seen as a joke, he does on occasion show that he can be genuinely threatening when he wants to be.
    • He comes up with a plan in "Operation: M.O.V.I.E." that actually impresses the other villains. Too bad Numbuh 4 heard it first.
    • He also managed to "flush" the entire Grand Canyon after the KND filled it with cereal and milk.
    • In one episode, he manages to defeat the other villains single-handedly after he believes they're Sector V in disguise.
    • But the most poignant example of this trope for Toiletnator is when he's transformed into a senior citizombie in Operation Z.E.R.O. He manages to transform a good number of both heroes and villains alike into other citizombies, and manages to track down Tommy and Numbuhs 3, 4 and 1 all by himself, all while giving off a genuinely frightening presence.
  • Paper Master: His affinity for toilets extends to even toilet paper, which he can fire from his wrists as spiralling streams.
  • Punny Name: His first name is Lou, a play on "loo" being a British term for restroom.
  • Significant Double Casting: He and Numbuh 4 are both voiced by Dee Bradley Baker because they're uncle and nephew.
  • Throw the Dog a Bone: In the final episode, while all the other villains are taking part in a scavenger hunt, Toiletnator was having the time of his life at a toilet-themed amusement park.
  • Toilet Humor: With more focus on actual toilets rather than bodily functions.
  • Villain Episode: "Operation: F.L.U.S.H." focuses on him and his attempts at being taken seriously by his fellow villains.
  • Villains Out Shopping: The kids run into him grocery shopping and find that he likes the same brand of sugary cereal that they do.
  • What Kind of Lame Power Is Heart, Anyway?: His motif is questionable. It also seems he's got some psychic control over flushing all sorts of liquids.
  • Warm-Up Boss: As befitting the fact that he's the most unfortunate and pitiful villain, he serves as the boss of the tutorial level in Operation: V.I.D.E.O.G.A.M.E..
  • The Worf Effect: Inverted in "Operation: Z.E.R.O." - nobody's really surprised when he ends up the first victim of Grandfather's senior citi-zombie plague, but the fact that it makes him take about ten thousand levels in badass is what really hammers home what level Grandfather's power is on.

    The Ice Cream Men 
The Ice Cream Men

The evil employees of the Tasty Taste Ice Cream Corporation, the Ice Cream Men usually serve as mooks for the Delightful Children and Father. Voiced by Dee Bradley Baker, Kevin Michael Richardson, Daran Norris, Matt Levin, Maurice LaMarche, Tom Kenny, Khary Payton, and Jess Harnell.

  • Child Hater: This is part of their job, as Tasty Taste Ice Cream Trucks never stop for children and only deliver to "responsible adults".
  • Demoted to Extra: The Ice Cream Men were major mook antagonists in the first two seasons but were gradually phased out in favor of the Six-Gum Gang and other villains as the plots shifted to more school-based stories. They never disappeared entirely however.
  • Heavily Armored Mook: As seen when they invade the KND Antarctica Base, they have armor designed like ice cream waffle cones. (These may or may not qualify as Elite Mooks.)
  • Improbable Weapon User: They're often armed with ice cream guns.
  • Punch-Clock Villain: In the sense that being villains is their jobs, it's never shown what they do on their own time.


A spirited candy pirate who loots and plunders candy from neighborhood children. He respects Numbuh 5 and seeks her as an apprentice. Voiced by Mark Hamill.

  • Always Someone Better: When it comes to consuming sugar, he's still second to both Numbuh 5 and Black John.
  • Badass Beard: Filled to the brim with candy.
  • Badass Normal: Among few villains that don't have superpowers.
  • Captain Colorbeard: Or Adjective-beard.
  • Card-Carrying Villain: Like the others, goes to villain support groups and meetings.
  • Dressed to Plunder: He wears an eyepatch, a black bicorner hat with a skull on it, a Blackbeard-style beard (with candy stuck in it), and a peg-leg and hook-hand both made from candy canes.
  • Enemy Mine: With Numbuh 5, against Black John Licorice.
  • Even Evil Has Standards: He considers the idea of anyone dying at the hands of the Great White Asparagus so horrifying that he doesn't hesitate to save even the KND from the monster.
    • He even told Numbuh 5 to not mention the incident to the other villains.
  • Fat Bastard: He's chunky and he likes to steal candy from kids.
  • Friendly Enemy: With Numbuh 5 (at least).
  • From Nobody to Nightmare: Was once a lowly cabin boy under the vicious candy pirate Black John Licorice. Back then he was known as "Stickyfuzz".
  • Hook Hand: With a candy cane instead of a hook.
  • Manchild: With his bombastic behavior and love of candy, he's quite childlike. Notably this helps to characterize him as Not So Different to the protagonists and makes him one of the more sympathetic members of the rogues gallery.
  • One Degree of Separation: Numbuh 5's other candy rival, Heinrich, was once his cabin boy.
  • Pirate: He's a pirate who searches for candy rather than treasure.
  • Serious Business: Candy stealing is his prime modus operandi. Get in the way of that, and you're good as dead. And also being told that he was "sugar-free".
    • Being called "sugar-free" is Serious Business to any candy pirate as he says this to Black John Licorice and Numbuh 5 says this to him.
  • Sweet Tooth: Stickybeard loves candy.
  • Talk Like a Pirate: Of course, since he's an odd Expy of Blackbeard.
  • Villains Out Shopping: When he attacked the treehouse on the night Numbuh 1 needed rest, Numbuh 5 asked why that night, to which he replies that "he bowls on Tuesdays".
    • He was also seen getting groceries at the villains' supermarket in "Operation: M.U.N.C.H.I.E.S."
  • Weapon of Choice: His preferred weapon is a candy cane sword.
  • We Can Rule Together: To Numbuh 5. It almost succeeded until she remembered her friends, but now it leads to below.
  • Worthy Opponent: To Numbuh 5. She's the only person in the world who can beat him in a sugar swallowing contest (Black John Licorice might disagree). She's the only one to give him an affectionate nickname of "Sticky Buns" in return.

    Mr. Wink and Mr. Fibb 
Mr. John Wink and Mr. Timothy Fibb

A pair of villains who use robotic Super Chairs to fight the KND. Mr. Wink is voiced by Tom Kenny and Mr. Fibb is voiced by Dee Bradley Baker.

  • Ambiguously Gay: While their extremely close relationship could be written off as a case of Heterosexual Life-Partners, the fact that they're references to a pair of fictional gay hitmen raises some eyebrows. It's eventually revealed that Mr. Wink had a thing for Lasso Lass and wanted to go to prom with her, but this doesn't necessarily preclude him from being bisexual.
  • Ambiguously Human: Mr. Wink has buffalo horns on his head and Mr. Fibb has tusks and flippers like a walrus. They almost certainly were fully human at one point, but evidently something must have happened to them at some point that messed up their anatomy.
  • Animal Motifs: buffalo's for Mr. Wink and Walruses for Mr. Fibb. (See Above)
  • Bald of Evil: Mr Fibb lost his hair as a teenager, and blames that as part of his villainous personality.
  • Bestiality Is Depraved: Mr. Wink is seen running away from a smitten Clip-Clop at the end of "Operation: C.O.W.G.I.R.L., which implies something going on between him and his old team's horse.
  • Blinding Bangs: Mr. Wink's eyes are covered up by his hair.
  • Brilliant, but Lazy: Their shtick—they must be pretty darn smart if they're able to build their Humongous Mecha chairs, but they seem to build said chairs solely so they can do all the fighting for them.
  • Creepy Monotone: Though there are rare instances were they do show emotion.
  • Expy: They're repackaged versions of the camp and straight gay assassins from Diamonds Are Forever.
  • Face–Heel Turn: As children, they once fought adult tyranny themselves as part of the Cowboy Kids Club alongside Lasso Lass. Why Mr. Wink became evil is never mentioned, but Mr. Fibb says his reason was because Lass wouldn't go to prom with him, as well as losing his hair.
  • Freudian Excuse: According to Mr. Fibb in Operation: C.O.W.G.I.R.L., he and Mr. Wink "grew up" because the former didn't get to go to the prom with Lasso Lass. This would also explain their hatred toward the KND - the kids probably remind them of their younger selves in the Cowboy Kids Club.
  • Friendly Enemy: Not in the series proper, but in the pilot, they join the KND for a snack break in mid-battle.
  • Humongous Mecha: Expect any chairs they may be sitting in to be a Super Chair of some kind.
  • Mister X and Mister Y: Naturally, considering their origin (see expy above).
  • Starter Villain: The very first villains the KND ever face, way back in the pilot. And relatively harmless at that. All they really did is extend adult swim and keep kids away from the pool.
  • Verbal Tic: Often asks rhetorical questions to each other, while addressing each other's names at the end of their sentences.
  • Villainous Breakdown: In Operation: C.O.W.G.I.R.L., when their Freudian Excuse is revealed. Another immediately follows when it turns out Lasso Lass really did like Mr. Fibb, but he's so shy he runs away screaming at the thought of kissing her. A similar incident occurs between Mr. Wink and Clip-Clop, and they never appear as major villains again.

    The Great Puttinski 

Rupert Puttkin/The Great Puttinski note 

A former champion mini-golfer until his winning streak was broken by Numbuh 2 beating him. Humiliated, he tried to get even with Numbuh 2 by having him shrunk so he could kill him in one last game of mini-golf. Voiced by Rob Paulsen.

  • Basement-Dweller: He still lives with his mother.
  • Berserk Button: The one thing that really sets him off is telling him that mini-golf is "just a game" or "kind of dumb".
  • Demoted to Extra: He only has cameos at villain gatherings after his debut episode.
  • Disproportionate Retribution: He tries to kill Numbuh 2 and shrink the world so he could use it and the universe as his own mini golf course, just because he unintentionally ruined his mini-golf championship and dismissed the sport as "kind of dumb".
  • Insistent Terminology: He goes off on anyone who says "mini-golf", angrily insisting that the correct name is "miniature golf".
  • Jerkass: Even before he goes insane he hits Numbuh 2 with his golf ball (albeit presumably by accident) and then demands it back without apologizing. He also insults Sector V, calling them "snot nosed kids" and mocks Numbuh 2 for being fat. He also proves very arrogant, calling Numbuh 2 a loser and insisting that if he played against him "one zillion billion" times, he'd beat him every time. In fact, the only reason Numbuh 2 challenged him was to get back at him for his rudeness.
  • Manchild: Not only is he a Basement-Dweller, he also acts extremely childishly, to the point that actual ten-year-olds come off as more mature than him. Becomes a case of Psychopathic Manchild when he tries to kill Numbuh 2 and shrink the Earth so he can use it as a golf ball and play mini-golf with the universe as his new personal corse.
  • Monumental Theft: His mini-golf game held in his house uses real monuments, such as the Sphinx, being shrunk down. This leads to Monumental Damage after Numbuh 2 makes him grow with the size-changing ray, causing him to accidentally wreck most of the course.
  • Serious Business: He takes mini-golf way too seriously, to the point that he feels greatly dishonored by Numbuh 2 costing him his title as a mini-golf champion. And then he goes insane when he hears Numbuh 2 say mini-golf is "kind of dumb".
  • Small Name, Big Ego: Takes great pride in his champion title. His golf ball has his picture on it and he says only true mini golf champions like himself possess it.
    Numbuh 5: They have champs in mini golf?
  • Sore Loser: See Disproportionate Retribution.
  • Steven Ulysses Perhero: He plays mini-golf and his surname contains "putt".

    Mr. Mogul and Simon 

Mr. Mogul and Simon

Mr. Mogul is the head of the Rainbow Monkey Corporation, the company that makes the Rainbow Monkey toys. Simon is Mr. Mogul's assistant. They once tried to manipulate Numbuh 3 into helping them find the real Rainbow Monkeys. Mr. Mogul is voiced by Rob Paulsen (except for "Operation: M.O.V.I.E.", where he is voiced by Dee Bradley Baker), while Simon is voiced by Tom Kane.

  • Bald of Evil: Mr. Mogul has no hair.
  • Corrupt Corporate Executive: Mr. Mogul is in charge of the Rainbow Monkey Corporation and had no trouble at all in manipulating a young girl into essentially helping him poach real Rainbow Monkeys as well as doing away with her when she became wise to his true intentions.
  • Fat Bastard: Mr. Mogul is overweight and not all that nice.
  • Fat and Skinny: Mr. Mogul is overweight while Simon is skinny.
  • Would Hurt a Child: Whatever he intended to do to the Rainbow Monkeys after he captured them, he had no qualms with doing to Numbuh 3 to ensure she didn't squeal on him.
  • The Unreveal: Whenever he explains what he intends to do with the Rainbow Monkeys, he only tells it in an unintelligible whisper, though it's strongly implied he intends to kill them and use their bodies to make toys.

    Gramma Stuffum 
Gramma Stuffum

An old lady obsessed with force-feeding her disgusting food to children to fatten them up, believing that a child that is too fat to move can't get into trouble. Voiced by Grey DeLisle.

  • Anthropomorphic Food: All her creations can move and fight independently, she's even accompanied by Liver and Onions, a sentient liver and a pair of onions who serve as her personal assistants.
  • Chef of Iron: A type 3 example. While she prefers to let her food do the fighting, she herself is pretty dang strong; she's been shown smashing through walls and throwing around all manner of heavy objects, and also has proven surprisingly resistant to the to the weaponry of the Kids Next Door.
  • Evil Old Folks: One of the oldest recurring villains on the show, as indicated by her name and grey hair.
  • Fat Bastard: She's a chubby villain.
  • Food-Based Superpowers: She can animate any food that she has cooked into a loyal minion, and can also summon food that she has cooked, animate or inanimate, to her side whatever her current position.
  • Force Feeding: Her modus operandi is to force children to eat until they are seriously overweight under the reasoning that if kids are too fat to move, then they can't get themselves in trouble.
  • Funny Foreigner: She speaks with a thick German/Bavarian accent.
  • Lethal Chef: The main reason Gramma Stuffum is a villain is because her recipe book tends to be made of three categories: Stock "Yuck!" foods like liver, onion, pig snouts and Brussels sprouts; nauseating combination dishes and counter-intuitive serving styles like her liverwurst & headcheese casserole and her octopus burgers; and outright inedible food, whether that's due to just being inherently rotten or full of inedible objects like bones and hair, or it's just made from ingredients nobody would eat, like her curried rats and candied lizards. Taken Up to Eleven in that she's also a Chef of Iron, so her food is literally lethal in that it will beat reluctant diners into submission to force itself down their throats. Funnily, a few non-gross menu items have shown up amongst her army from time to time, like grilled cheese sandwiches, so she's arguably not so much a bad chef as she just has a really weird idea of what's good food.
  • Prim and Proper Bun: A very Mrs. Doubtfire-esque style.
  • Punch-Clock Villain: According to "Operation: F.O.O.D.F.I.T.E.", anyway; in this episode, after the bell to signal the end of the lunch period rings, she graciously accepts her defeat and cheerfully notes she's looking forward to seeing them tomorrow for another battle.
  • Took a Level in Badass: "Operation: F.O.O.D.F.I.T.E." proves she's become more powerful with her giant Slamwich creation.
  • Stout Strength: She's overweight yet very strong.
  • Villain Song: She gets two musical numbers in the episode "Operation: F.O.O.D.F.I.T.E." while trying to take down the Kids Next Door with her yucky food minions. The first is an ode to herself and an explanation of her mission, whilst the latter is a bragging song about the power of her ultimate minion, Slam Wich.
  • Well-Intentioned Extremist: She thinks all children are starving, and wants to feed them. Unfortunately, her food is horrible, and she stuffs children until they have terrible tummyaches. She even considers fat kids to be skinny. She also thinks that making kids fat and putting them in food comas will keep them out of trouble.
  • Wicked Witch: Wears a witch's hat in Operation: F.O.O.D.F.I.T.E., and it may be an explanation for her powers.
  • Why Did It Have to Be Snakes?: Hamsters, they've defeated her on at least two occasions.

    Robin Food and the Hungry Men 
Robin Food

A cafeteria worker at an old folks' home who goes out and steals kids' lunches so he doesn't have to cook for the elders himself. The senior citizens are less than grateful for his..."heroic" deeds. Robin Food is voiced by Rob Paulsen, while the Hungry Man known as Little Juan is voiced by Roger Rose.

  • Authority Equals Asskicking: In his debut episode, he puts up more of a fight by himself than his entire team put together.
  • Captain Oblivious: Doesn't even react to the senior citizens calling him out for giving them food they have trouble eating. Nor does he react when the Senior Citizen Squad vocally threatens to beat the ever-loving shit out of him for it. That is, until they do.
  • Card-Carrying Villain: To kids, and boy howdy does it show.
  • Corrupted Character Copy: While the original Robin Hood genuinely helped people even if he was a criminal, this version of him steals largely because he's too lazy to do his actual job and doesn't care if the people he's supposedly helping have genuine reasons to dislike what he does.
  • Expy: You don't say?
  • Lazy Bum: Would rather break into a school cafeteria and steal food from children than cook anything like he is supposed to.
  • No Celebrities Were Harmed: Little Juan's voice is a clear imitation of Sammy Davis Jr..
  • Not-So-Well-Intentioned Extremist: At first, it looks like their pillaging of schools to steal kids lunches to give to the elderly is a really nice thing to do, with this goal causing Lizzie to relent from attacking them and break down apologizing. Until Lydia and the Senior Citizen Squad finally get to explain that Robin Food and his Hungry Men are the cafeteria workers at the Sure Wood Forest Senior Center, and are stealing kids' food out of laziness so that they don't have to cook anything themselves. In addition, the residents of the retirement home don't even like the food that he brings them and struggle to eat it, with it playing havoc with their dentistry and making them ill, and likely other things.
    Lizzie: I don't want you to starve!
    Lydia: WOULD YOU JUST TAKE YOUR LUNCH AND GET OUT OF HERE ALREADY?! So we can beat the stuffing out of the guy wearing the tights, thank you very much! Move!
    Lizzie: You don't want my lunch?
    Lydia: Of course not! Every day this lazy cafeteria worker and his pals are supposed to make us a good old person lunch! But instead he brings us all this munchkin food! What with the peanut butter jelly sandwiches, the salty potato chips! Feh and yuck! Do you know what peanut butter does to my bridgework?
    (As she says this, Lizzie glares at a sheepish Robin Food)
    Old Man: Just once we'd like some good old-fashioned liverwurst on rye!
    Old Woman: Or some nice mushy oatmeal!
    Old Man 2: But he just brings us all this fatty kid stuff! I haven't been able to go to the bathroom in weeks!
  • Oh, Crap!: When Lizzie catches his staff, his mood deflates rather quickly.
    Robin Food: YOOOOO-HOOOOO!! [Lizzie catches him in mid-air] Oh rubbish.
  • Simple Staff: He takes on Lizzie's L.O.C.K.A.H.S.O.C.K.A.H. with nothing more than a quarterstaff, just like his inspiration.
  • Spontaneous Choreography: Has a habit of doing this.
  • Surprisingly Realistic Outcome: The school food he keeps feeding to the elders messes with their digestive systems, which they happily call him out on. One man mentions that he was constipated for weeks from the fatty foods.
  • What the Hell, Hero?: The Senior Citizen Squad chew him out for bringing them and the other elders "fatty kid stuff". Both verbally and physically.

    Crazy Old Cat Lady 

Crazy Old Cat Lady

An old woman who lives with thousands of black and white cats. Voiced by Grey DeLisle.

  • Ambiguously Human: She has several feline traits, including claws and cat-like facial features, and has an incredibly strong sense of smell. Whether she's a human who just happens to look like a cat, some kind of human-cat hybrid, or something else entirely is never made clear.
  • Attack of the 50-Foot Whatever: She can summon her cats to form a giant cat monster which she controls from the mouth.
  • Beast Master: Can command her cats to do her bidding.
  • Card-Carrying Villain: Interestingly, she was just an obsessive recluse in her first appearance. Afterwards, she's in all of the villain groups with the others. (Presumably the KND's rescue of Numbuh 4 incited her; she was known to them but she didn't seem to have met them prior.)
  • Crazy Cat Lady: Very, very crazy. She has more cats than Los Angeles has people and she never lets any of them out of her sight or out of the house. She also seems to have some sort of empathetic bond with them.
  • Fat Bastard: The Toiletnator even points out her obesity in "Operation: F.L.U.S.H." when he calls her "portly" while mistaking her for a disguised Numbuh 2.
  • The Nose Knows: She shares the heightened senses of her pets, and has a superhuman sense of smell.
  • The Pig-Pen: Like a lot of animal hoarders, her house is disgusting and almost toxic to enter.
  • Shout-Out: In "Operation F.I.S.H", she imitates Sauron.

Knightbrace / Mr. Jelly

A villain obsessed with dental and oral hygiene. He was kicked out of dental school due to wanting to put braces on babies and was forced to work in his family's candy shop, where the sight of children ruining their teeth with sugar drove him to madness, and eventually dental vigilantism. Voiced by Tom Kenny.

  • Braces of Orthodontic Overkill: Wears a set as part of his costume (which can be used as a throwing weapon), and likes to forcibly attach these to kids as well. In his debut episode, he forced a giant set of metal braces on Numbuh 4 that were big enough to cover his entire face.
  • Card-Carrying Villain: After his first appearance, he seems to have embraced his villainous identity.
  • Depraved Dentist: A failed dentist who delights in forcing torturous dental treatments on children. The reason he's a "failed" dentist is because he was barred from the profession after he tried to put braces on babies.
  • Does Not Like Spam: He's the only character in the series, hero or villain, who doesn't like Rainbow Munchies cereal.
  • Eviler Than Thou: Played for Laughs. In "Operation: M.U.N.C.H.I.E.S." the villains are horrified to learn that he was going to destroy the last box of Rainbow Munchies cereal because it was bad for your teeth. They pull an Enemy Mine with the KND and beat him up.
  • The Friend Nobody Likes: The other villains aren't too fond of him, since he takes away the food they like as well. The only reason he isn't the Butt-Monkey of the villains is because A) he's actually fairly competent and B) they hate the Toiletnator even more.
  • Irony: As a dentist, he is opposed to candy and all sugary foods, but his favorite food is taffy.
  • Knight Templar: He wants children to have good dental hygiene. The problem is, he wants to FORCE kids to have good dental hygiene, and was blacklisted from dentistry due to his psychotic obsession, especially when he attempted to put braces on babies (who don't even have teeth in the first place).
  • Secret Identity: Initially Mr. Jelly used Knightbrace as an alias so he could "undo his damage" as a candy shop owner. After his debut episode, he almost exclusively appears as Knightbrace with nary a mention to his actual identity.note  Though he does briefly appear without his costume in "Operation: A.W.A.R.D.S." due to it being stolen by the KND beforehand.
  • Start of Darkness: Claims he was "driven to near-madness" after being forced to watch children ruin their teeth with the candy from his store, and became Knightbrace as a result. As Dr. Teef points out, he was already crazy long before he became Knightbrace.
  • Trademark Favorite Food: Taffy, which is a problem, since he will go nuts for the stuff and is easily defeated by it.
  • Uncertain Doom: In "Operation: I.N.T.E.R.V.I.E.W.S.", he and Potty Mouth are last seen at the mercy of a Queen Tie. It's not clear whether the Queen Tie killed them or simply turned them into accountants.
  • Weaksauce Weakness: If a large quantity of taffy (his favorite food) is thrown in his direction, he will be too distracted eating it to focus on anything else.

    Professor XXX-L 
Professor XXX-L

An insane scientist whose main goal is to create the perfect snowcone. Voiced by Frank Welker.

  • Animorphism: In every appearance he makes, he has a different animal body part in place of his own. Before appearing in KND, he had a large lobster claw instead of an arm. In his first KND episode, he had a turtle shell, and later still he showed up with octopus tentacles in place of legs.
  • Anti-Villain: He's never a villain in any of his appearances. He's always doing something innocuous (usually trying to invent a perfect snowcone) that is mistaken for villainy by the KND. The only reason he could be called a villain at all is that he gives the kids enough of a fight to be the main antagonist in all of his episodes.
  • Bait-and-Switch:
    • Turns out that he wasn't the evil scientist trying to create a machine to permanently end snow days, that's the guy next door.
    • His successful kidnapping of Numbuh One was simply to harmlessly use him as a taste tester to help develop the perfect snowcone, which he can't develop on his own due to being susceptible to brain-freeze.
  • Beware the Silly Ones: While he's not at all malevolent and generally comes off as a harmless eccentric, he does have the potential to be genuinely dangerous, as shown by his conflicts with the KND.
  • Big Fun: He is easily one of the wackiest characters in the entire show, thanks to how he has a random animal body part every time he appears, his Large Ham tendencies, and his obsession with making the perfect snowcone.
  • Early Installment Weirdness: Appears in the Kenny and The Chimp short that was the original pilot for the series, as a mad scientist fighting against the Parent Teacher Association. In this version he also collects a large amount of deadly disease samples, though he has forgotten why he's doing it.
  • Fat Bastard: Subverted. He's fat and the Kids Next Door have fought him on many occasions, but all he really wants to do is create the perfect snow cone.
  • Goal in Life: His mission statement is to create the world's most perfect snowcone.
  • Irony: The biggest obstacle to his goal to perfect the snowcone is the fact that he suffers from ice cream headaches very easily. Not only would he have difficulty enjoying one if he ever succeeds, it's hard for him to taste test his experiments.
  • Large Ham: He may not be an actual Mad Scientist, but he's just as over the top as any self respecting mad scientist.
    "Welcome to the secret laboratory of... PROFESSOR TRIPLE EXTRA LARGE!
  • Mad Scientist: Subverted; he looks and acts like one, which makes the KND assume the worst of him, but all he ever does is make frozen desserts.
  • Surreal Humor: He owes his entire existence to this trope, due to being a zany scientist who has constantly changing animal body parts and an obsession with making the perfect snowcone, as well as an unfortunate tendency to accidentally get into trouble with our heroes.
  • Transplant: From the 1997 Kenny and the Chimp short that indirectly led to KND (the KND were conceived as recurring characters who would cause trouble for Kenny and Chimpy).
  • Villainy-Free Villain: He may be the least evil villain the KND have ever fought next to the Toilenator. Yes, he did kidnap Numbuh 1 but it was for harmless research purposes and once he explained it to him, Numbuh 1 agreed to help.

    King Sandy 
King Sandy

A boy who thinks he is a king and usually tries to force Numbuh 3 to marry him, but eventually chooses her sister Mushi instead. Voiced by James Arnold Taylor.

  • And Now You Must Marry Me: He tries to force Numbuh 3 to marry him twice.
  • Authority in Name Only: He's not king of anything. Possibly, he and his cousins Cannot Tell Fiction from Reality.
  • Card-Carrying Villain: Double Subverted; he's very villainous in his first appearance, but only because he is obsessive about being "the King." Later on, when he is trying to get revenge for his past defeats, he fully embraces his villainous nature, all the while still professing to be king.
  • Does Not Like Shoes: Even when not on the beach, he goes barefoot.
  • Likes Older Women: Until he meets Mushi, he states that he prefers older women.
  • Love at First Sight: He falls in love with Numbuh 3 and Mushi the instant he meets them.
  • Power Trio: His three knights/cousins are his powerful minions.
  • Puppy Love: He and Mushi are young children who become a couple.
  • Scarpia Ultimatum: In "Operation K.A.S.T.L.E.", he coerces Numbuh 3 into marrying him by threatening to dump a bunch of Rainbow Monkeys into a vat of hot nacho cheese.
  • Toxic Friend Influence: Implied. After he falls in love with and woos Mushi, she starts acting much more selfish and psychotic in subsequent episodes. The fact that he helps her escape her bedroom after the events of Operation: S.P.A.N.K.E.N.S.T.I.N.E doesn't really help.
  • Unholy Matrimony: He and Mushi fall in love and are evil.

    The Interesting Twins from Beneath the Mountain 
The Interesting Twins from Beneath the Mountain

A pair of Japanese twins, who work for Father. Voiced by Tom Kenny and Tara Strong.

  • Butt-Monkey: Where to begin... they get attacked by a dog, have their most destructive vehicle destroyed, get beaten up by the Japanese KND operatives, disguise themselves as a KND operative only to get attacked by Wink and Fibb, and the Crazy Old Cat Lady. Seriously, compared to these guys, Numbuh 4 is the luckiest kid in the world.
  • Creepy Twins: They're an evil and sinister pair of twins.
  • Eerie Pale-Skinned Brunette: They're villains with black hair and pale skin.
  • Finishing Each Other's Sentences: They often finish each other's sentences, being twins.
  • Half-Identical Twins: They're twins of different genders, complete with Yin-Yang patterns on their faces to really drive the point home.
  • Master of Disguise: They can make themselves look like anyone.
  • No Name Given: They refer to one another as "Brother" and "Sister", respectively.
  • Polar Opposite Twins: While they've been Delightfulized by Father like the Delightful Children from Down the Lane, unlike the Delightful Children they don't act as a Hive Mind and have different personalities. The sister is the more dominant of the two, being more volatile, paranoid and quicker to anger, while the brother is calmer and more sensible but also more timid.
  • Villainous Breakdown: The sister is eventually driven to a meltdown when they find out Numbuh 3 was just leading them into a trap after all the trouble they went through.
  • What the Hell, Hero?: The brother's response when the KND makes his sister cry for not being their targets.

    Cheese Shogun Roquefort 
Shogun Roquefort

A Cheese Shogun who believes cheese to be more valuable than gold. Voiced by Kevin Michael Richardson.

  • Anti-Climax Boss: Granted, we never actually see the showdown between him and Numbuh 2, but at the end of his spotlight episode Numbuh 4 (of all people!) deduces that he probably hit his head on the ceiling and knocked himself out when he and Numbuh 2 were jumping at each other.
  • Cool Helmet: A cool samurai helmet with the emblem of a cheese wheel with two knives in it.
  • Evil Sounds Deep: Like a lot of Kevin Michael Richardson's roles, he's a villain with a deep voice.
  • Fat Bastard: He's a villain who happens to be obese.
  • Screw This, I'm Outta Here!: In "Operation: I.N.T.E.R.V.I.E.W.S.", he leaves the scavenger hunt when informed that it's likely the Delightful Children's birthday cake isn't cheesecake.

    Six-Gum Gang 
Six-Gum Gang

A gang of cowboy-style robbers who work for the Delightful Children From Down The Lane. Voiced by Jennifer Hale (Runt and Dixie), Tom Kenny (Goof), Ben Diskin (Wilbur) and Dee Bradley Baker (Lunk).

  • Abnormal Ammo: Their iconic guns shoot wads of chewing gum.
  • Cowboys: Meant to be like train robbers straight out of a western.
  • The Bad Guy Wins: They managed to make off off with all the kids' homework despite Numbuh 4 and 5's efforts to stop them. However it winds up subverted as since the homework at the top of the pile was Wally's when they gave it to the Delightfuls. The teacher chews them out for how utterly sloppy "they" did, rendering the gang's efforts for nothing.
  • Nice Hats: Ten-gallon hats, to fit the theme.
  • Quirky Mini Boss Squad: A gang of criminals in service to the Delightful Children.
  • Revolvers Are Just Better: Their primary weapons are six shooters that shoot chewed up bubble-gum.
  • The Smurfette Principle: Dixie is the only girl on the team.
  • Villainous Crush: Lunk calls Numbuh 5 gorgeous and offers to let her keep her homework in exchange for a kiss. Numbuh 5 refuses. Lunk apparently hasn't changed his mind in "E.L.E.C.T.I.O.N.S."

    Heinrich Von Marzipan/Henrietta Von Marzipan
Click here to see spoiler 

Heinrich Von Marzipan/Henrietta Von Marzpan

"Ach, liebschen, I say so many things I do not mean. Like, 'ah, no more candy for me,' or, 'who would like some of my lollipops?' "

A former friend of Numbuh Five and current candy-hunting rival. He greedily seeks forbidden candy regardless of the consequences. Voiced by Dee Bradley Baker/Candi Milo.

  • Aesop Amnesia: After spending the entirety of Operation C.H.O.C.O.L.A.T.E sick of sweets due to his touch turning everything he lays his hands on into chocolate, the next time we see Heinrich he's right back to sweets.
  • As Long as It Sounds Foreign: Sometimes shouts German-sounding nonsense, which is funny because his voice actor speaks fluent German.
  • Arch-Enemy: He is Numbuh Five's most personal adversary.
  • Brought Down to Normal: Got turned into a chocolate monster that can turn anything he touches into chocolate. After Numbuh Five defeats him, the KND turns him back to normal.
  • Card-Carrying Villain: Though likely because the cursed caramels have explicitly made him evil.
  • Does Not Like Spam: He hates pickles.
  • Evil Cannot Comprehend Good: He never learns that sharing one's candy is better then trying to have it all to yourself. It was the reason he, or rather, she was changed into a boy in the first place due to a curse to get delicious caramels. Heinrich nearly made it permanent in his final appearance until Numbuh 5 has to practically spell it out for him that if he shares it'll finally break it. Thankfully he finally listens and got his rightful gender back.
  • Evil Former Friend: Numbuh 5's. They used to be candy-hunting partners, but the events of Guatemala caused them to become enemies. After breaking the curse of the caramels, Henrietta and Numbuh 5 go back to being friends.
  • Fat Bastard: He's a little chubby and he's not very nice. As Henrietta, she's much thinner.
  • Gender Bender: In sacrificing his beauty, he switched genders. He's actually a girl.
  • Greed: Obsessed with getting candy and never sharing it, which usually leads to many of his downfalls.
  • Heel–Face Turn: Once the curse over him is lifted, she goes back to the way she was before and vows to make amends for her wrongdoings.
  • High-Class Glass: A very classy monocle. It's unknown if he's a blue-blood himself, but it would make sense, given his resources and free time.
  • Homage: He's a nod to Indiana Jones Nazi villains. Considering he's an overweight German boy who's obsessed with sweets, he's also likely an homage to Augustus Gloop from Charlie and the Chocolate Factory.
  • I Lied: As his quote indicates, he's prone to lying when he promises to change for the better.
  • Insane Troll Logic: He will always find some way to make any misfortune he suffers into Numbuh 5's fault, even when she outright warns him what will happen. Best seen in "Operation CHOCOLATE" where he wants revenge on Numbuh 5 for circumstances that are entirely of his own making.
  • Never My Fault: He does this a lot, such as in his first appearance where he blames Abby for tainting the candy with the taste of asparagus when she warned him beforehand that being greedy will put that curse into effect. It's also his grudge for the Guatemala Incident as after he sacrificed his beauty due to yet another curse. He once more blamed Abby for not stopping him from eating his caramels and supposedly leaving him stuck in that state. Turns out she was trying to find a way to break the curse, and discovered the cure required a sacrifice she knew he wouldn't make.
  • Noodle Incident: Throughout the series he remains angry at Numbuh 5 for "Guatemala". His last appearance in Operation CARAMEL reveals that he performed a ritual to get delicious caramel by sacrificing their best trait (in his case her beauty) and blamed Numbuh 5 for allowing it to happen.
  • One-Winged Angel: In his first appearance after obtaining a jewel, he transforms into a monster with power of candy. Numbuh Five defeats him. After falling into a chocolate volcano, he returned as a powerful monster who can turn things into chocolate by touching it. He was cured by the KND.
  • Roaring Rampage of Revenge: When he returns after falling into a chocolate volcano, having been turned into a chocolate monster.
  • Samus Is a Girl: Heinrich is indeed a girl, originally Henrietta von Marizpan. A cursed set of caramels deprived her of her beauty, making her into a him.
  • Serious Business: Like with Stickybeard, Candy is serious business to Heinrich.
  • Tragic Villain: Heinrich has done a lot of Jerkass things that have only narrowly avoided making him irredeemably cruel but he suffers some truly horrific things and there is a heavy implication that he is addicted to the delicious foods he actively hunts down. "Operation: C.A.R.A.M.E.L. only adds to the tragedy when it's revealed that he used to be friends with Numbuh 5 and became an ugly boy because she sacrificed her beauty for cursed caramels.

    James Nixon McGarfield  
James Nixon McGarfield

Former 4th grade president of Gallagher Elementary, who eventually becomes evil after the KND once helped him to the city hall from the Delightful Children and their Father. Voiced by Tom Kenny.

Margie/Madame Margaret

The principal of St. Rita's Preparatory School, who attempts to turn all the boys on the planet into girls. Voiced by Candi Milo.

  • Badass Cape: Her future self wears a cape.
  • Does Not Like Men: Her hatred of the male gender is greater and more destructive than even that of Numbuh 86.
  • Eye Glasses: Her younger self, her adult self (which turns out to be a robotic suit), and her future self has these.
  • Massive Numbered Siblings: She mentions having several brothers. It's more or less her Freudian Excuse for wanting to get rid of boys.
  • Mobile-Suit Human: Piloted by her younger self, in which the lower half is a walker. It's also hinted that she's paraplegic. However, her future self seems perfectly capable of walking on her own.
  • Omnicidal Maniac: Her plot to rid the world of boys is ultimately fatal, as it would prevent the creation of future generations of humans. Had it not been for Future Numbuh 4, humanity would have been doomed to a slow, painful extinction a la 12 Monkeys.
  • Pink Means Feminine: She wears a pink dress.


A school rival of Numbuh 5 and a Were-Poodle. Voiced by Grey DeLisle as Valerie and Dee Bradley Baker as a Were-Poodle.

  • I'm a Humanitarian: In her debut episode, she almost tried to eat Numbuh 5, claiming that the student who did a perfect homework assignment is more delicious than the homework assignment itself.
  • Wolf Man: She's a were-poodle that subsists entirely on homework.

    Chef Pierre 
Chef Pierre

A French chef who was once hired by Father to create a giant ice cream cake for the Delightful Children. He only appears in "Operation: C.A.K.E.D.-F.I.V.E." Voiced by Jess Harnell.

  • Evil Chef: He's a French chef in league with Father.
  • French Jerk: He's French and he's not very polite.
  • Gag Nose: His nose is big and silly-looking.
  • What Happened to the Mouse?: He just disappears from the plot after Numbuh 3 tells him he's not invited to the Cell Block party.

    Black John Licorice 
Black John Licorice

A candy pirate who once tried to steal a bunch of licorice trees from an island off the coast of North Dakota. A curse ended up befalling him and his crew, which caused the licorice to turn from red to black and the pirates to all become black licorice skeletons who only come alive at night. Voiced by Marc Graue.

  • Captain Ersatz: He's an obvious parody of Captain Hector Barbossa from the Pirates of the Caribbean film series.
  • Dem Bones: Because of the licorice curse, he's now an undead skeleton made of black licorice.
  • Near-Villain Victory: He almost succeeded in growing the licorice tree seed and lifting the curse he and his crew suffered while the seed was still inside Heinrich Von Marzipan, but Stickybeard's pirates kicked the seed out of Heinrich at the last minute.
  • The Unfettered: According to Stickybeard, he'd stoop to any low to get candy, including steal it from his own mother.
  • "The Villain Sucks" Song: Stickybeard and his crew sing about Black John and the curse his crew suffered in a song called "Licorice, Licorice".
  • Would Hurt a Child: He didn't care at all that Heinrich Von Marzipan could get killed by having the licorice tree grow while the seed was still in his stomach.

    Senator Safely 
Senator Safely

A senator overly concerned about children getting hurt who tries to set things right by creating an army of Safety Bots in "Operation: S.A.F.E.T.Y." Voiced by Dave Wittenberg.

  • Anti-Villain: Make no mistake, building an army of giant robots to make children safe whether they want to be or not is rarely a sane thing to do, but Safely's still in the right as far as his intentions go.
  • Expy: He's a clear pastiche of the X-Men villains Senator Kelly and Bolivar Trask. Like the former, he's a senator with a misguided agenda toward doing the right thing. Like the latter, he builds an army of giant robots to eliminate what he views as a threat, while the Safety Bots are a blatant homage to Trask's Sentinels.
  • Placebo Eureka Moment: It takes him a second to realize that while trying to get him out of the way, congress gave him an insanely huge budget for his cause.
  • Think of the Children!: It's not that he's the only senator who is trying to pass a law concerning children. Its just that he's the only senator whose trying to pass a law to 'help' children, rather than the rest of them who are desperate to be the ones who get to pass ones that 'hurt' them.
  • Well-Intentioned Extremist: He only made the Safety Bots out of a misguided attempt at ensuring children stopped getting hurt, especially since Congress is too busy trying to find new ways to oppress children for no discernible reason.

    The Rowdy Hooligans From Across The Square 
The Rowdy Hooligans From Across The Square

Three British children who work for Father and are the enemies of Sector E. Voiced by Tom Kenny, Jennifer Hale and Frank Welker.

  • Catchphrase: The boy with the blue scarf: "Wink wink, nudge nudge, say no more."
  • Foil: To the Delightful Children From Down the Lane. The Delightfuls act as one single-minded entity, are openly hostile to other children and are deadly enemies with Sector V. The Rowdy Hooligans are three distinct persons who, while loyal to Father, get along quite well with Sector E and act friendly enough to Numbuh One that he mistakes them for Kids Next Door operatives.
  • Friendly Enemy: While they work for Father, they are friendly enough with Sector E to have a drink with them after their mission.
  • Nice Hat: The only girl on their team wears a towering hat reminiscent of Buckingham Palace's guards.

    Potty Mouth 
Potty Mouth

A toilet-themed villain with foul language. Voiced by Maurice LaMarche.

  • Always Someone Better: He mainly exists to make the Toiletnator look like even more of a loser by being a toilet-based villain who isn't an incompetent dunderhead.
  • Big, Stupid Doodoo-Head: His theme is profanity, but in practice he mainly just uses puerile insults like "doodyhead".
  • Catchphrase: He often begins sentences with "You're poopin' right..."
  • Early-Bird Cameo: He first appeared as a background character in "Operation: M.O.V.I.E." before finally making a full appearance in "Operation: A.W.A.R.D.S."
  • Sir Swears-a-Lot: Parodied. Profanity is his theme, but he doesn't actually swear. Robin Food has to stop his rant because it's a family show (whether he was referring to the award show or acknowledging the Cartoon Network censors is up for debate).
    Potty Mouth: Oh, go flush yourself down a pee-pee hole, you toilet paper covered doodyhead!
  • Uncertain Doom: In "Operation: I.N.T.E.R.V.I.E.W.S.", he and Knightbrace are last seen at the mercy of a Queen Tie. It's not clear whether the Queen Tie killed them or simply turned them into accountants.

    Dodgeball Wizard 
Dodgeball Wizard

A wizard who has power over dodgeballs and has set out to prove adults rule the dodgeball court. Voiced by Dave Wittenberg.

  • Evil Old Folks: While his goal to prove adults are the best at dodgeball is relatively harmless, he was willing to kill Joey in their game.
  • Gag Nose: His ultimate undoing.
  • I Want My Mommy!: Threatens to tell his mom that Joey broke his nose.
  • No Indoor Voice
  • Sinister Schnoz
  • Would Hurt a Child: His first scene is him clobbering several kids with dodgeballs to be the champion and his first concern when it seems like he killed Joey with a colossal dodgeball was to celebrate his supposed victory.

    Nurse Clayborne 
Nurse Clayborne

A nurse who worked at the same school the Kids Next Door go to. She also has another job as a baker with apple crumbles as her specialty. After Numbuh Two discovered the disgusting secret of her apple crumbles, she was forced to work at a Rainbow Monkey retirement home after the bakeries blacklisted her.

  • I Ate WHAT?!: Numbuh Two is disgusted when he finds out she had been infecting kids with pink eye so she can use their eye crust as the topping for her apple crumbles. Numbuh Three and Numbuh Five are also horrified when they find out she had been making Rainbow Munchies cereal out of shredded Rainbow Monkey dolls.
  • Two-Faced: The right side of her face becomes permanently coated in crust after her partner, Joe Balooka shot her in the face with a water balloon infected with pink eye.
  • Would Hurt a Child: This crazy nurse was insane enough to give kids pink eye so she can harvest their eye crust and use them as apple crumble toppings. And she was more than ready to kill Numbuhs Three and Five to prevent them from telling everyone she was making the Rainbow Munchies cereal from shredded Rainbow Monkey dolls.

    The Senior Citizen Squad 
The Senior Citizen Squad

Lydia Gilligan, Sheldon and Maurice. A trio of senior citizens who are able to temporarily revert to a more youthful form by using Anti-Aging Creme. Their ultimate weapon is their Combining Mecha, the Senior Ciizen Robot. Voiced by Candi Milo, Tom Kenny and Dee Bradley Baker respectively.

  • Anti-Villain: They're generally more interested in their own ends than anything else. They do hijack a tapioca truck and attack the KND, but as far as villainy goes, that's about it. Really, they'd barely qualify as villains at all if not for the above. In fact, they downright help Lizzie in Operation L.U.N.C.H., though primarily because they're all sick to death of the food they can't eat that Robin Food keeps bringing them.
  • Combining Mecha: The Senior Citizen Robot, formed of Maurice's wheelchair for the legs, Sheldon's walker for the body and Lydia's cane for the arms.
  • Deadly Disc: Maurice's wheel shields double as throwable disc weapons.
  • Flight: Sheldon's walker wings allow him to fly.
  • Fountain of Youth: They can temporarily revert to teenage forms with the use of Anti-Aging Creme, although it doesn't last very long.
  • Hour of Power: The Anti-Aging Creme allows them to fight on even terms with the KND, but it lasts for a pitifully-short amount of time.
  • Senior Sleep Cycle: Maurice is often seen asleep.

    KND Splinter Cell (MASSIVE SPOILERS!
A traitorous shadow group within the Kids Next Door Organization who intend to destroy all adults on Earth, good or bad, and is unknown to Supreme Leader Numbuh 362 or most KND operatives.
  • Big Creepy-Crawlies: When they're seen on-screen, they mostly piloted giant caterpillar-like mobiles.
  • Renegade Splinter Faction: It's in their name, being a rogue faction that is out to kill all adults rather than evil ones. Then this gets subverted, as they're true members of the GKND operating as a "splinter cell" to draw suspicion off their true goals.
  • Walking Spoiler: It's hard to talk about their true purpose for the entirety of the Galactic Kids Next Door.

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