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* AlternativeCharacterInterpretation:
** Are The Little Traitor Dudes For Children's Defense, the "negative" counterparts of The Delightful Children From Down The Lane really good guys or just bad guys who were brainwashed like what happened with their counterparts?
** Is the global organization a rebellious group of kids devoted to defying adult authority? Or a benevolent, somewhat KnightTemplar-ish group protecting the children of the world from those that wish to harm or unjustly oppress them? Although OP: Z.E.R.O. seems to confirm on the latter, some viewers tend to scale strictly on the former.
*** Or are they straight-up [[VillainProtagonist Villain Protagonists]] with a SympatheticPOV? This was a lot more plausible early on in the show.
** Is [[BigBad Father]] a psycho (with a convincing FreudianExcuse) suffering from VillainDecay, or a WoobieDestroyerOfWorlds?
** Does the KND inadvertently continue a CycleOfHatred by decommissioning operatives who turn 13? The older members of the KND would likely have no reason to arbitrarily turn on their friends and join up with the teens and adults who have been menacing them for most of their lives. But the KND rejecting them and trying to remove their memories could result in former operatives feeling betrayed so they devote themselves to destroying the organization and all it stands for. Those who are successfully decommissioned no longer have any type of loyalty or camaraderie for the KND and easily recruited by their former enemies because they don't know any better. "Operation: M.A.U.R.I.C.E." and Numbuh 12's betrayal seemingly supports this theory.
** The entire show is a game a bunch of kids are playing, or a story they made up. (This theory seems to be gaining ground on 4chan)
*** And adding on to that theory, Numbuh One is a kid who possibly [[spoiler: moved away or died]]. Likely the former, because [[spoiler:Numbuh One eventually returns.]]
** [[spoiler:Knowing what we know now about Lizzie Devine/Numbuh Vine according to GKND, Did she REALLY love Nigel or was this all just a ruse?. On the same topic it could be possible that every example of Lizzie being a idiot or oblivious to being in danger like in Operation D.A.T.E. shows she's been engaging in ObfuscatingStupidity the whole time.]]
* AssPull: The idea that Chad Dickson [[spoiler:was an double agent and was helping Sector V throughout all their missions. Even in episodes that featured him prominently it's clear that he was evil and that his defeats weren't due to any self sabotage on his part.]]
* AuthorsSavingThrow: Adulthood being equated to a "disease" by a representative of the [[spoiler:Galactic KND]] was seen by a few viewers as seeming just a bit ''too'' outlandish for the series. The AprilFoolsDay ViralMarketing has since revealed [[spoiler:the Galactic KND to be ScaryDogmaticAliens]], somewhat amending this particular complaint.
* BadassDecay: Father lost a lot of his credibility after "Operation G.R.A.D.U.A.T.I.O.N", and lost it completely when his role as the sinister main villain was taken away from him by Grandfather in "Operation Z.E.R.O". Even after Grandfather was defeated, Father never fully recovered. Also qualifies as VillainDecay.
* BigLippedAlligatorMoment: In "Operation: W.H.I.T.E.H.O.U.S.E.", [[spoiler:Numbuh One goes [[TheIncredibleHulk Hulk]] [[HopeSpot and briefly fights off all of the U.S. forces]] before they ZergRush him and he wakes up from [[OrWasItADream what appears to be]] a normal dream.]] It makes ''slightly'' [[ItMakesSenseInContext more sense in context.]] The apparent assumption was [[spoiler:he realized it was a dream, and thus he could do almost anything he wants.]]
* CrazyAwesome: ''[[WorldOfBadass EVERYONE.]]'' even the little KND operatives.
* CreepyCute: The titular lice is "Operation: L.I.C.E."--they eat hair and sport some rather impressive fangs, but the bugs are rather adorable. ''Especially'' the baby lice seen on Numbuh Two near the end.
* CrossesTheLineTwice: According to a brief line [[VillainSong Grandma Stuffem sings]] in "Op: FOODFITE," her [[AttackOfTheFiftyFootWhatever giant "Slamwitch"]] is "made of cheese and ''[[ExoticEntree puppy feet!]]''" After a culmination of BreadEggsMilkSquick lyrics that get progressively [[{{Squick}} squickier]], [[BlackComedy it's darkly hilarious.]]
* CrowningMusicOfAwesome: The rock opera episode, complete with a score by GWAR, who re-performed the song themselves after being unable to find stock copies. The episode was mostly Squick but the music was awesome.
* DesignatedVillain: Done deliberately with Professor XXXL, who in all his appearances is just trying to create the perfect snowcone, but the KND always ruin his plans thinking he is doing something evil. Even Numbuh One knows his plan and goes along with it, and the kicker was he actually tried the perfect snow-cone before he was taken back by his friends.
* EarWorm
** ''Rainbow Monkeys, Rainbow Monkeys...''
** And the opening theme. (''Dun nun nun NUN nun . . .'')
** Robin Food's theme tune.
** "''Licorice! Licorice!''"
** "Operation: F.O.O.D.F.I.T.E."? ''ALL OF IT''
* EnsembleDarkhorse
** Rachel, a.k.a. Numbuh 362, who literally ate her way through brocoli to stop the spread of it.
** [[spoiler: Sector Z]] from ''WesternAnimation/OperationZERO''. Who developed a huge fanbase after only five minutes of screentime.
** Tommy Gilligan, a.k.a. The Tommy, Numbuh Two's younger brother. He was a big secondary character later in the series, but only because of his popularity early on.
* EvilIsCool: Father, a pitch-black ManOnFire and MagnificentBastard with a [[EvilIsHammy terrifyingly hammy voice]].
** Grandfather himself is truly epic at being the main villain. He's so menacing that even Father couldn't stand up to him. He's also an EvilGenius who gives a sinister vibe to ''Operation Zero''.
* FamilyUnfriendlyAesop: While it's never meant to be taken seriously, the kids in this series tend to have a severe case of paranoia towards adults who are not their parents, as the adults ([[ProperlyParanoid more often than not]]) have spent their lives making kids miserable until the kids themselves grow up to be adults that torment more kids. Needless to say, this series doesn't do much for healthy child-adult relationships.
* FanPreferredCouple
** [[BattleCouple Numbuh One×Numbuh Five]]
** Numbuh One×Numbuh 362
** Numbuh Two×Numbuh 86
** Numbuh Three×Four were this in the first season thanks to fan reaction to "Operation: O.F.F.I.C.E.". The escalating ShipTease in the subsequent seasons upgraded them into OfficialCouple status. Even the last episode revealed that they'd be husband and wife.
** Numbuh 65.3×Lizzie: They're both glasses-wearing geeks. In "Operation: L.E.A.D.E.R.", Lizzie pretends to flirt with him and says she likes his pocket protector, making 65.3 blush. In "Operation: G.I.R.L.F.R.I.E.N.D.", 65.3 tells Nigel to say "hi" to Lizzie for him.
* FoeYay: Numbuh Five and Heinrich Von Marzipan.
** There's definitely some between Numbuh One and Chad Dickson, as well. "Operation: T.R.E.A.T.Y." is fodder for it with the ChainedHeat situation and a flashback to Nigel and Chad's formerly close friendship. The entire situation reads like two exes being forced to work together after a bad breakup. The fact that Chad condescendingly calls him "Nigey" -- his ex-''girlfriend's'' AffectionateNickname for him -- definitely doesn't help.
* FunnyAneurysmMoment:
** "Operation: G.R.O.W.N.-U.P." has Father and a grown-up Numbuh One facing off, and, after Father comments on what a "disappointment" the DCFDTL are, Numbuh One responds with "that must run in the family". And then, in the same scene, Numbuh One says that "his Grandma can throw better than [Father]." [[spoiler:Which, considering Father is Nigel's uncle, and considering that it turns out Grandfather actually does find Father to be a disappointment... yeah.]]
** In the Kenny and the Chimp pilot, Kenny got... Swine Flu, a major epidemic in summer 2009.
** "Operation F.U.T.U.R.E." is a Franchise/{{Terminator}} parody, where girly girls take over the world from an all girls school and the last rowdy boys are fighting a losing battle against them. Many academic studies show that in RealLife the girls are increasingly taking over, due to being generally better students and that today's rowdy boys are going to be tomorrow's losers.
** [[http://online.wsj.com/article/SB10001424052748704111504576059713528698754.html?mod=WSJ_hp_mostpop_read#articleTabs=article Tiger Moms]] -- the battle against adult tyranny is as important as ever!
** In 2003, "Operation: P.O.P." aired, where the "Soda Control Act" forbids anyone under the age of 13 from drinking soda, forcing kids to "brew" soda illegally and sell and drink it in speakeasies a la the days of Prohibition. In 2013, [[http://en.wikipedia.org/wiki/New_York_City_soft_drink_size_limit a law]] was almost passed in New York City that would have forbade anyone from purchasing/selling drinks with a certain sugar content in any size bigger than 16 ounces. One can only wonder what the Kids Next Door were up to during the months of battling over the law's legality.
** Numbuh 5's father being a Creator/BillCosby expy, anyone?
** "Operation: T.R.I.C.Y.C.L.E." featured a character called Numbuh 10-Speed, a parody of Lance Armstrong. Not so funny anymore after the reveal that Armstrong used steroids to win his Tour de France titles. Lampshaded in the Galactic Kids Next Door ARG site, where entering Numbuh 10-Speed's name returns the response [[TakeThat "undergoing testing".]]
* GeniusBonus: In "Operation F.A.S.T.-F.O.O.D.", the father shark complains about having to stop at a red light, saying, "Doesn't anyone realize I need to keep moving?" Biologically speaking, this is true--sharks need to be in constant motion, or else they die.
* GrowingTheBeard: The Season 1 Finale established continuity for the series, as well as the introduction of Father and the fact that the KND is not just the five featured on the show, but rather many different sectors.
* HarsherInHindsight
** In ''Kenny and the Chimp'', one of the joke diseases that Kenny get is ''Swine Flu''. And then in 2009, it came back (swine flu was around in the mid-1970s).
** In "Operation: C.A.T.S.", Numbuh 5 claimed that she was a dog person. [[spoiler: Then came ''Operation: D.O.G.H.O.U.S.E.''...]] where she ended the honor roll student's curse of turning into homework-munching were-dogs.
** At first, it was ok to not give sympathy to the Delightful Children From Down The Lane, but after the movie where we realized that they used to be Sector Z, a missing KND sector and were "delightfulized", it would mean that their "negative" counterparts, The Little Traitor Dudes For Children's Defense were once evil operatives of the Destructively Nefarious Kids or DNK, a negative counterpart of the Kids Next Door where they are devoted to tormenting children everywhere rather than saving them.
** The KND's Splinter Cell was an [[KnightTemplar extremist group]] who wants to get rid of adults bad AND good which the KND opposes. In Operation T.R.E.A.T.Y., the group are revealed at least and it turned out to be [[spoiler:fakes made by Numbuh 74.5239 and Numbuh Infinity who are aligned with the Galactic Kids Next Door who are above even Soopreme Leader Numbuh 362 that fight against adulthood in space]]. Just as we knew about the Splinter Cell comes the teaser for the next possible sequel series... [[spoiler:The G:KND has Nigel make the decision on activating something that would likely endanger the planet Earth in order to get rid of adulthood there once and for all which Chad begs him to not go through with it because of their friends and family still on the planet. To confirm Chad's fears, Numbuh Vine/Lizzie alerts Wally and Kuki to evacuate EVERYONE on Planet Earth kid and adult alike! In a way, the Splinter Cell DOES exist and it is named the Galactic Kids Next Door who will take down adulthood even on the ''planetary scale''!]]
** Potentially, Lizzie in general. She's been Nigel's girlfriend for what might very well have been years, starting in Operation: L.I.Z.Z.I.E., and continuing up until their break-up in Operation: G.I.R.L.F.R.I.E.N.D., with her getting several episodes and even ADayInTheLimelight, with a bunch of CharacterDevelopment in between. [[spoiler: The G:KND "teaser" revealed her to be a Galactic-Level Operative, Numbuh Vine. In one fell swoop, [[WhamEpisode every single one of her appearances in the series just got put into question.]]]]
** Numbuh 5 and Cree's father Mr. Lincoln is a pretty obvious parody of Bill Cosby. It's much less charming in the wake of the sexual assault scandals that have potentially tarnished Mr. Cosby's family-friendly image.
** There have been reports of 'troubled teen camps' that are practically concentration camps for kids instead of Jews. If there is any reason for the KND to exist in real life, it [[http://www.cracked.com/personal-experiences-1680-5-things-i-learned-escaping-troubled-teens-facility.html is]] [[http://www.cracked.com/personal-experiences-1270-6-shocking-realities-secret-troubled-teen-industry.html this.]]
* HeartwarmingInHindsight: "Operation: O.O.M.P.A.H." already gives Numbuh One and his father Mr. Uno several sweet moments. However, as noted on the FridgeBrilliance/CodenameKidsNextDoor and Heartwarming/CodenameKidsNextDoor subpages, ''WesternAnimation/OperationZERO'' reveals [[spoiler: that Mr. Uno had a horrible, horrible father, and instead of growing up into a child hater like his brother, Mr. Uno tries his best to keep up with his son and be a genuinely good dad.]]
* HilariousInHindsight: The BigLippedAlligatorMoment in "Operation: W.H.I.T.E.H.O.U.S.E." got funnier after Creator/BenDiskin got [[WesternAnimation/HulkAndTheAgentsOfSMASH a new job]].
** Along similar lines, Diskin would go on to [[WesternAnimation/MiraculousLadybug another show]] where he went against adults being jerks (albeit in this case, the adult that caused him to become a MonsterOfTheWeek- the BigBad- and the guy who made him feel that way are speculated to be the same person, rather than a whole group of evil adults).
** The BigBad goes by "Father" and has a personal connection to TheHero's father. [[Manga/FullmetalAlchemist Sound familiar]]?
** The fact that the show is now 13 years old is this to some fans.
** The toughest, bravest member of the team and best at hand-to-hand combat is a blond boy named Number [[Literature/{{Divergent}} Four]].
*** Along those same lines, in "Operation: B.E.A.C.H.", Numbuh 4 squared off against King Sandy [[ImprobableWeaponUser wielding nothing but a shovel]] to save his, ahem, [[EveryoneCanSeeIt "friend who owes him a quarter"]], Numbuh 3. Just over ten years later, ''VideoGame/ShovelKnight'' came out and took this concept to its logical conclusion.
** Fourth grade class president Jimmy Nixon [=McGarfield's=] [[StalkerWithACrush infatuation]] with Lizzie Devine, when you consider the recent revelation in the [[https://www.youtube.com/watch?v=kPni6B2d9QM GKND teaser video]] that [[spoiler:Lizzie was actually a botanical alien operative of the Galactic Kids Next Door disguised as a human. Her affection for Numbuh 1, who Jimmy viewed as a rival, probably wasn't even sincere. It's a good thing that Jimmy's assistant Anna revealed her love for him and he subsequently returned her feelings, abandoning his fixation on Lizzie.]]
** Years after the show first aired, Numbuh 1's voice actor became the English dubbed voice for [[{{Manga/JojosBizarreAdventure}} Joseph Joestar]]. ''[[https://www.youtube.com/watch?v=ScK3p90IZlM He used the exact same voice.]]'' If you're a fan of both Western Animation and Anime, it becomes a case of CantUnhearIt.
*** A similar case happens in ''Anime/TenkaiKnights'', where he plays Toxsa. For those who don't know, Toxsa is the biggest nerd on the team and sounded ''exactly'' like Numbuh 2, causing another case of CantUnhearIt.
** The scene from the episode C.A.K.E.D F.I.V.E where [[spoiler: the orbital station was destroyed by starship in the atmosphere]], became a mirror to the signature scene from Film/RogueOne where[[spoiler: a Hammerhead Frigate [[RammingAlwaysWorks rammed]] into two Star Destroyers to destroy the force field generator at the orbit]].
* HoYay: Mr. Wink and Mr. Fibb. Not only are they always joined at the hip, but they also live together and the ''Film/JamesBond'' villains they're based on are canonically gay.
* JerkassWoobie
** The Delightful Children. As it turns out, [[spoiler: they were the former members of the KND called Sector Z]]. See [[NightmareFuel/CodenameKidsNextDoor Nightmare Fuel]].
** Father, after ''WesternAnimation/OperationZERO'' (and minor moments in "I.T." and "C.A.K.E.D.-F.I.V.E.")
** [[spoiler: Chad]] following the reveal that [[spoiler: his betrayal of the KND was [[FakeDefector a ruse]]]]. On one hand, he's still an incredibly egotistical and bitter person, to the point that he [[spoiler: tries to kill Nigel in Operation T.R.E.A.T.Y.]] However, it's easy to feel some degree of sympathy for him given [[spoiler: the fact that he willingly sacrificed his own reputation and friendships within the KND; for the sake of his mission.]]
* MagnificentBastard: Count Spankulot in "Operation L.O.C.K.D.O.W.N." To get revenge on Sector V for getting him sent to jail he uses his vampire powers to lure Numbuh One to the prison and turns him into a spank happy vampire like himself. He then sics Numbuh One on the rest of Sector V to turn them into vampires as well, who proceeds to make use of an effective ParanoiaGambit to allow himself more victims. The Count then goes on to explain that the only way to be cured would be for Numbuh One to spank him and gloats how that's impossible because he's safe and sound in jail.
** Father in the first three seasons. [[VillainDecay Not so much in the latter three.]]
* MemeticBadass: Just watch "Operation: K.N.O.T." and ''try'' to say Moosk doesn't have the makings of this.
* MemeticMutation: One fansite dedicated to re-captioning screenshots had characters discuss a clothing-optional resort. "The resort" has been a KND meme ever since.
** "[[http://www.youtube.com/watch?v=CqOc3tHunPM I hate everyone]]" [[labelnote:Explanation]]Father's deadpan reaction to a space station crashing down on his house. Has become popular as a response to particularly annoying or infuriating posts or events.[[/labelnote]]

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* MoralEventHorizon
** Chester trying to feed ''live children'' to sharks. He even tries to murder Numbuh Three with the proclamation that he'll deep-fry her after a failed first attempt!
** Nurse Claiborne trying to outright ''murder'' Numbuh Three and turn her into breakfast cereal.
** Grandfather when he turns the world into a dystopia with children being forced to work in tapioca factories. And that's JUST the backstory.
** Father trying to bake children into a cake.
** Numbah 3 crosses this in Operation H.O.T.S.T.U.F.F, when she almost kills her teamates as a demonic girl obsessed with the thermostat.
* NauseaFuel
** One episode where "chicken pox" takes the form of literal squirming chicken heads sticking out of one's skin.
*** Plus, when the chickens themselves are in low quality, they look like writhing maggots in the kid's flesh.
** A villain named the Common Cold attacks by siphoning mucus out of his nose. [[SarcasmMode Especially lovely]] when he starts to ready a really big attack. Probably why he was DemotedToExtra after his first 2 appearances.
** In "Operation: P.I.N.K.E.Y.E.", being hit with a water balloon filled with pinkeye mucus would cause crusty red stuff to grow all over you. The episode's villain turns out to be using this crusty stuff as the crumbs in crumb cake. It gets even worse at the end of the episode: "So if the pinkeye was the crust, then what was the filling?" ([[spoiler:achoo!]])
** Even worse? In ''two'' later episodes, Numbuh Two ''still eats the stuff'' and [[LampshadeHanging he comments about it]] as well!
** Is no one going to mention "Operation: V.I.R.U.S.", where there is a close-up of Cree's gigantic and disgusting pimple?
** A few of TheMovie's Senior Citizombies have ''sagging'' ''GagBoobs.'' [[spoiler:This included the citizombified versions of Numbuh Three and Five.]]
** At the end of "Operation: C.A.K.E.D.-T.H.R.E.E., after the KND defeat the Delightful Children's Giant Birthday Present Robot with the help of an army of Chicks, Numbuh 1 is about to take the cake from the Delightful Children when the Chicks defecate all over it. Numbuh 1 then convinces the Delightful Children to eat the cake, which they do. It also counts as an in-universe example, as several children are grossed out from watching the Delightful Children eat the soiled cake on their television sets.
** Awesome music aside, "Operation F.O.O.D.F.I.T.E" grossed some people out, especially the giant slam-witch monster.
* ParanoiaFuel: More than one viewer 13 and older has entertained the thought that maybe, just ''maybe'', they had once been KND operatives and have [[LaserGuidedAmnesia since been decommissioned]].
* PeripheryDemographic: Like many before and after it, this is a show in a child-centric network about children who fight teens and adults that many teens and adults love.
* TheScrappy: Lizzie Devine's first appearance where she's EasilyForgiven for attempting to brainwash Numbuh One didn't do wonders for her reputation among fans, and even after CharacterizationMarchesOn, it was a FandomSpecificPlot in even non-shipping fanfics to have Numbuh One dump her for the better-liked Numbuh Five or 362.
** RescuedFromTheScrappyHeap: Much of the hate towards Lizzie has died down both after "Op: GIRLFIREND" and the reveals in the GKND ARG [[spoiler: that she was a secret galactic-level alien KND operative all along]].
* SeasonalRot: Ironically around the time the series began to establish its mythos and continuity, which was about Season 2 and onward for some people, when {{Flanderization}} took hold of Numbuhs 3 and 4 despite all the character development everyone got, especially those two despite their {{Flanderization}}. Some fans also complained the show began to take itself ''[[AudienceAlienatingPremise too]]'' seriously, given the humour in many early episodes was the self awareness of the kids [[NaughtyIsGood antagonising anything standard kids would]].
* ShipsThatPassInTheNight: Numbuh 86 and Numbuh 60 is a rather popular ship, despite the fact that they never really had any onscreen interaction. (The closest was Operation: T.R.A.I.N.I.N.G., when Arctic Base got a distress signal from Moonbase. And even that turned out to be just Father disguised as Numbuh 86.)
* ShockingSwerve: Operation P. R. E. S. I. D. E. N. T. It's doubtful that anyone saw [[spoiler: President Jimmy's FaceHeelTurn]] coming.
* SpiritualLicensee: This show can be considered the closest thing to an animated version of the ''[[Film/SpyKids Spy Kids]]'' films.
* {{Squick}}: Anything that involves Nurse Claiborne. Her apple crumble is topped with pinkeye!
*** That's nothing compared to what the apple crumble filling is implied to be. How can Numbuh Two stand to eat the stuff, knowing just what it's made out of?
** Rainbow Monkey Cereal is made with [[spoiler:''shredded Rainbow Monkey dolls.'']]
** Zombiefied Numbuh Three and Four kissing each other. (Shudders)
*** Could've looked way cuter if they were normal, but as old zombies...(pukes)
** Toenails collection.
*** Even worse was the subtle revelation that the Delightful Children ''use the bathroom together!''
* SuspiciouslySimilarSong: The two songs by Music/{{GWAR}} that are featured in "Operation: F.O.O.D.F.I.T.E.".
* TastesLikeDiabetes: It's not hard to see why Numbuh 4's not all that fond of Rainbow Monkeys.
* TheyWastedAPerfectlyGoodCharacter: Many villains like the Common Cold or Mega Mom and Destructo Dad were only the villains of one episode.
** WordOfGod even acknowledges that it's a shame Numbuh 60 didn't get much development.
** Chad being a villain. Though he had a few episodes where he was the main villain, for the most part he was treated like just another teenager that the KND had to face.
** Numbuh 12 was never seen again after she betrayed the KND and joined the teenagers after realizing that since she was almost 13 and would be decommissioned soon otherwise.
** Sector Z had a memorable role in ''WesternAnimation/OperationZERO'' but after their big reveal [[spoiler:that they were the Delightful Children brainwashed all along]], the plot point is never revisited nor given any closure.
** "The Steve", the leader of the teenagers, only appeared in the second to last episode of the series.
** Maurice aka Numbuh 9. He was introduced as something of a GoodCounterpart to Chad and introduce the major plot point to the series that [[spoiler: Some of the elite operatives continued to work as deep agents for the KND, even after turning 13]]. After his introduction episode though he more or less gets DemotedToExtra.
* TheyWastedAPerfectlyGoodPlot: The KND "Splinter Cell" arc foreshadowed an internal civil war in the KND between the extremist Splinter Cell that believes all adults must be destroyed vs. the more moderate faction that believes only the evil adults should be stopped. It is also revealed that the Splinter Cell had been kidnapping KND scientists for unknown reasons. However, near the end of the series, it turns out that the Splinter Cell is just an front for the KND scientists, who fake their kidnappings so they have more free time to watch their favorite science fiction shows as well as manage "the Galactic Kids Next Door", the workings of which were left very vague in the end. However, [[https://www.youtube.com/watch?v=v_2aDok_CcQ a teaser animatic]] featuring the original cast and produced by Mr. Warburton suggests that a civil war plot expanding upon the working of the GKND may be on the way. Still, many fans would've preferred this plot without the GKND.
** There's also the matter of the 1/362 ShipTease. Despite ''Operation: I.T.'' showing how close they were and ''Operation: G.I.R.L.F.R.I.E.N.D.'' all-but-confirming that Rachel has feeling for Nigel beyond friendship, it was never resolved. The trope comes in with after [[spoiler: Lizzie dumped Nigel,]] which looked like it was foreshadowing that he would end up with Rachel. You can imagine how many fanfics have centered around them getting together.
** Some fans were hoping that more would've came from Numbuh 1's report in "Operation: A.R.C.H.I.V.E.S.", especially since the ending indicated that there was at least ''some'' level of truth in it.
** In most fiction, adults hate teenagers far more then they do small children and teenagers hate being bossed around by adults. Instead of being complete allies to the adults, it would have been interesting if the teenagers were a more independent group that battled both adults and kids.
* ToyShip: ''Several''.
** In the main team alone; 3+4 didn't so much have subtext as it was just plain text from the start, 2+5 was a slightly more debatable case, and 1+5 had some good chemistry. But let's not get into the ''web'' that the fans ([[ShipTease and creators]]) have spun.
* UglyCute: [[WhatMeasureIsANonCute Ramon 4]] from Op SATURN.
* ValuesDissonance: [[OurVampiresAreDifferent Count Spankulot]], a vampire who spanks disobedient children. Along with spanking children being frowned upon in modern society, the idea of a grown man going around and spanking children he doesn't know would be considered, well, [[MemeticMolester creepy]] nowadays.
* {{Woolseyism}}: All over the place in the Mexican Spanish dub, albeit not always for a good way, since all the characters speak using thick Mexico City accents, to the grade is very difficult not only for other Latin American viewers, but also for ''Mexican'' viewers outside Mexico City, to understand many dialogues without previous knowledge of the culture of Mexico City. The fact many of the voice actors are from Mexico City and also was dubbed there doesn't help.
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