History Main / TeensAreMonsters

** Subverted by Loretta [=McCready=] and Kendal Crowe. The former's a Bennett family protege turned drug dealer, slowly building her own criminal enterprise. The latter's from a long line of smugglers, thieves, and conmen. Both, however, have well-developed moral compasses and are better people than ninety percent of Harlan's criminals.

* ''Series/ToddAndTheBookOfPureEvil'': Crowley High may be a WeirdnessMagnet because of the wishes granted by the JackassGenie ArtifactOfDoom mentioned in the title, but the book can't really be blamed for the students' tendency to [[DisproportionateRetribution kill the wishmakers]]... and [[AssholeVictim only a couple wishmakers]] can be said to have had it coming.

* ''WesternAnimation/TheEmperorsNewGroove'': Kuzco is a 17-year-old Incan king, and while he isn't completely evil, throughout much of the film -- until his HeelRealization -- he treats the villagers in his kingdom like shit-[[WouldHarmASenior even having an]] ''[[WouldHarmASenior elderly man]] [[DisproportionateRetribution thrown out of a window for the crime of "throwing off his groove"]]. His idea for an 18th birthday gift is to bulldoze a village to the ground and build a theme park -- [[ItsAllAboutMe themed around himself, of course]].

* Kuzco from ''WesternAnimation/TheEmperorsNewGroove'' is a 17-year-old Incan king, and while he isn't completely evil, throughout much of the film-until his HeelRealization-he treats the villagers in his kingdom like shit-[[WouldHarmASenior even having an ELDERLY MAN]] [[DisproportionateRetribution thrown out of a window for the crime of "throwing off his groove"]]-; and his idea for an 18th birthday gift? Bulldoze a village to the ground and build a theme park-[[ItsAllAboutMe themed around himself, of course]]-.

* ''Film/TheWhale'': Ellie exemplifies this trope. She has severe behavioral issues, including cyberbullying, drug use, and blackmailing. She was even suspended from school for her behavior, and her grades have suffered as a result.

* Kuzco from ''WesternAnimation/TheEmperorsNewGroove'' is a 17-year-old Incan king, and while he isn't completely evil, throughout much of the film-until his HeelRealization-he treats the villagers in his kingdom like shit-[[HarmfulToSeniors even having an ELDERLY MAN]] [[DisproportionateRetribution thrown out of a window for the crime of "throwing off his groove"]]-; and his idea for an 18th birthday gift? Bulldoze a village to the ground and build a theme park-[[ItsAllAboutMe themed around himself, of course]]-.

* Kuzco from ''WesternAnimation/TheEmperorsNewGroove'' is a 17-year-old Incan king, and while he isn't completely evil, throughout much of the film-until his HeelRealization-he treats the villagers in his kingdom like shit-[[DisproportionateRetribution even having an ''elderly man'' thrown out of a window for the crime of "throwing off his groove"]]-; and his idea for an 18th birthday gift? Bulldoze a village to the ground and build a theme park-[[ItsAllAboutMe themed around himself, of course]]-.

* ''Film/TheWhale'': Ellie exemplifies this trope. She has severe behavioral issues, including cyberbullying, drug use, and blackmailing. She was even suspended from school for her behavior, and her grades have suffered as a result. The [[FreudianExcuse main cause]] of this is [[DisappearedDad Charlie's]] [[ParentalAbandonment abandonment]] when she was a child.

* All the contestants in the tournament in ''Manga/TheLawOfUeki'' are supposed to be junior high students. Yet, many of them do not mind using their powers to TakeOverTheWorld, and apparently don't have any qualms about killing their opponents.

* Creator/MohiroKitoh[='s=] manga tend to take a very dark view of teens and tweens. The best example would be ''Manga/ShadowStar'', in which [[{{Mons}} strange creatures called "dragonets"]] partner up with certain children, most of whom have issues with the way the adult world works, conferring upon them considerable power. Unlike other {{Mon}}-themed manga where that power would be used to protect Earth from alien or supernatural threats, many of the ''children'' become the threat themselves, turning their dragonets on each other and the adult world with horrific results. Also, as Hiro-chan's arc shows, those without dragonets have the potential to be monstrous as well.
* ''Manga/StrongestLegendKurosawa'' uses this '''a lot''', and at one point even compares them to animals.
* ''Mikado no Shihō'': [[spoiler: You realize that [[TheEvilPrince Rinshō]] is this once his older brother Emperor Sōun [[OnlyKnownByTheirNickname "Shiki"]] is revealed to only be ''[[YoungerThanTheyLook 17 years old]]''.]]

* Glemmy Toto of ''Anime/MobileSuitGundamZZ'' is a 17-year-old AcePilot and TheStarscream to BigBad Haman Khan who gets up to some truly nasty stuff over the course of the first Neo-Zeon War, eventually forming his own faction. Whether he's a SmugSnake or a MagnificentBastard is a matter of some debate amongst the fandom, but the fact that he's a serious problem, despite his youth, is not.
** Gyunei Guss ''Anime/MobileSuitGundamCharsCounterattack'' is not initially this, but after meeting Quess Paraya he quickly degenerates into this state, [[MotiveDecay forgetting all about]] his original goal of keeping Char in check and becoming obsessing with proving his worth to Quess at any cost. Quess herself might also count, though at 13 she's just a little too young to be considered a teenager.
** Carris Nautilus of ''Anime/AfterWarGundamX'' is a 15-year old boy who is willing to use increasingly extreme measures to bring the world under control. He eventually wises up. Shagia and Olba Frost, on the other hand, a pair of 19-year old {{Ace Pilot}}s do not, and their {{Wangst}} over how unfair life is treating them nearly triggers an utterly devastating war.
** Shinn Asuka of ''Anime/MobileSuitGundamSEEDDestiny'' is hardly evil, but as a young, impressionable, and emotionally damaged teenager he easily falls victim to [[DarkMessiah Chairman Durandal's]] toying with his emotions, and is used as the Chairman's attack dog for much of the show.
* ''VisualNovel/SchoolDays'' anime involves a number of teenagers doing false "dating practice" with sex, betraying, harassing, blackmailing, cheating, avoiding responsibilities, raping, and murdering.
* ''Manga/HighschoolOfTheDead'' is so prone to this, not even the good guys are immune. [[SociopathicHero Takashi Komuro]], [[spoiler:[[BloodKnight Saeko Busujima]]]], [[GunNut Kohta Hirano]], and RedShirt [[WithFriendsLikeThese Misuzu Ichijou]] are just a few examples.

* The characters in ''Manga/ZekkyouGakkyuu'' are schoolchildren... who, more often than not are willing to resort to murder to save their own hide or to get rid of a rival. Bullying also happens with great regularity and can get outright vicious.
* ''Anime/TweenyWitches'': [[spoiler:Lennon]] is most important and one of the few named teenage characters in the franchise. He is introduced attacking Arusu, the preteen heroine of the franchise, and [[spoiler:the other witches on the ''Ludens''.]]

* ''Manga/SailorMoon'': Rei Hino is a {{downplayed|trope}} example; she is usually quite unpleasant and irritable, but she also has a softer side. In the [=DiC=] dub, however, this is played straight, as Raye is portrayed as even more abrasive, especially in her interactions with Serena.

* This trope is used to its full potential in ''Manga/JojosBizarreAdventurePhantomBlood''. In the very first chapter, right after meeting the noble and courageous main character, a 12-year old [[LonelyRichKid rich boy]] named [[AlliterativeName Jonathan Joestar]], a blonde teen by the name of [[BigBad Dio Brando]] shows up and reveals that he is moving into his mansion and they will be brothers from then onwards. Little did poor [=JoJo=] know, Dio was a homicidal megalomaniac who believed his goal was to rule over the entire human race, and his first step towards becoming the king of the world was to torment Jonathan for all his life until he eventually got a hold of his inheritance. From Dio's POV, his ways of tormenting Jonathan includes (but is not limited to) physically abusing him, spreading false rumors about him so every kid in town hates him, humiliating him in a public boxing match (by playing dirty) burning his dog Danny alive, and [[spoiler:murdering Jonathan's father, who was his own adoptive father, to quickly get his hands on the money]]. But there is more: even after all of that happened, [[spoiler:Jonathan manages to defeat Dio more than once, but thanks to his [[EyeBeams vampire]] [[CombatTentacles powers]], he was able to kill Jonathan and [[GrandTheftMe steal his body]], which he would use to further torment and try to eliminate his descendants. And even after his death at the hands of those descendants, he kept disturbing the world's order via some wicked ideas of 'attaining Heaven' he had imprinted on his closest friend, who proceeded to reset the entire universe.]] Talk about a resentful dude.
* Creator/MohiroKitoh[='s=] manga tend to take a very dark view of teens and tweens. The best example would be ''Manga/ShadowStar'', in which [[{{Mons}} strange creatures called "dragonets"]] partner up with certain children, most of whom have issues with the way the adult world works, conferring upon them considerable power. Unlike other {{Mon}}-themed manga where that power would be used to protect Earth from alien or supernatural threats, many of the ''children'' become the threat themselves, turning their dragonets on each other and the adult world with horrific results. Also, as Hiro-chan's arc shows, those without dragonets have the potential to be monstrous as well.

* ''Manga/GreatTeacherOnizuka'': The lead character is the homeroom teacher of a class full of bullies, blackmailers, manipulators, and scheming sadists that hate all adults and believe that it is their mission turn every teacher they are given crazy, depressed or suicidal. However, every delinquent is given a FreudianExcuse and a {{Backstory}} explaining their behaviour and how they became "damaged goods". Also, the series isn't much more sympathetic in its treatment of the "nice kids" or "respectable adults", treating HumansAreFlawed as a basic condition with the apparently normal people simply using coping mechanisms which just don't stand out as much... for the moment.
* While not necessarily teenagers, most antagonists in ''Anime/YuGiOh'' were in their early twenties or earlier when they started out and were at that age once the feces hit the fan. There was Pegasus at age 22 when we first saw him, there was Malik/Marik who was a mere 16 when we saw him (and who had started down the path of evil before entering puberty), and Dartz who started at only age 21, and kept himself that way for who knows how long, and Yami no Bakura, who probably wasn't more than 20 in the original timeline. To say nothing of all the other minor antagonists over the course of the story that were never older than 25, teenagers must get a horrible reputation in their world.
** Prior to Duel Monsters taking the priority of the series, Yugi went through a whole series of teenage monsters every chapter in the manga, Seto Kaiba being among them.
** This didn't stop at the first series either. In ''[[Anime/YuGiOhGX GX]]'', the majority of [[MonsterOfTheWeek antagonists of the day]] were fellow teen schoolmates, the chief antagonists of season 2 were all early 20s or younger, and season 3's subplots and season 4's plot were all ultimately instigated by youngsters.
** Avoided in the third series ''Anime/YuGiOh5Ds'', mostly. While Aki is only 16, and goes on to terrorize Neo Domino as the Black Rose Witch and gets called a monster [[spoiler:until her HeelFaceTurn, that is]], all of the Dark Signers are adults.

* Miki from ''Manga/AishiteruzeBaby'' went to an extremely competitive school and saw a teacher beating up a fellow student for getting a low grade; the teacher left off with "Tell everyone you fell." The teacher never notices her, but Miki talks with her peers about it, none of whom are willing to tattle. One day, though, some of her classmates pull out an Exacto-knife, hold Miki down, and go all-out on her, saying that they wondered what it was like to hurt someone else for once. It starts with the teacher and how he treats them, but he has no part in what the students do -- he neither goads them into hurting anyone or suggests they do and has no knowledge it's going on; it's all their own decision.
* Manga/{{Arisa}} (actually her twin sister Tsubasa in disguise) has been ''ostracized, drugged underwater, beaten, and pushed off a cliff'', among other attacks by her classmates, because she's trying to find the "King" who has an almost hypnotic hold on her sister's class. Tsubasa/Arisa's friend who previously lost faith in the King was ostracized and DrivenToSuicide and is now paralyzed (it appears to be psychosomatic), but after finding out about Tsubasa being Arisa, she ''beat Tsubasa's aunt unconscious''.

* Explored in ''Manga/AttackOnTitan'', thanks to the series' focus on ChildSoldiers and how sometimes HumansAreBastards. While most adults commit horrible acts fully aware of what they are doing, many of the 104th Trainee Corps express callous attitudes or commit cruel actions because of their inexperience or emotional immaturity:
** Eren is downright terrifying, thanks to his UnstoppableRage and his past as an EnfantTerrible, often leading him to make decisions that have negative consequences on him and others.
** Mikasa is obsessively attached to Eren and she has become suicidally reckless when he is in danger. She has flat out stated before that she will hurt and even kill anyone, whether Titan or human, that stops her from getting to him and only cares about Eren and to a lesser extent, Armin.
** Jean is callous when his hometown of Trost was being attacked, complaining he was one day away from joining the Military Brigade and leaving the whole mess behind. His attitude [[BreakTheHaughty changes]] after the battle.
** Before enlisting, Sasha hated the refugees from Wall Maria for the famine her village suffered through, along with their being forced to give up hunting in favor of farming, and believed outsiders shouldn't be helped. Her father challenged her to enlist and change her selfish attitude.
** Krista was willing to [[spoiler:get herself ''and'' Daz killed, all for the sake of dying heroically]]. Ymir calls her out on this.
** [[spoiler: Reiner, Bertolt, and Annie might be incredibly [[TragicVillain tragic]], but they're still responsible for the events that killed off 20% of those living behind the walls. While they are the product of growing up as second-class citizens in a militaristic nation, and parents who pressured them to take on the mission for various reasons, all three are incredibly ruthless when it comes to accomplishing their mission. Reiner claims they didn't know anything when they began their mission, and all three [[TraumaInducedAmnesia definitely]] [[VillainousBSOD feel]] [[TearsOfRemorse remorse]] over their actions.....but their youth, relative inexperience as spies, and unstable emotions combined with their power makes them an absolute nightmare]].
** Ymir is incredibly callous and calculating, thinking only of herself and the girl she loves, Krista. She's unapologetic in weighing the lives of the people around her against her personal goals and leaves everyone around her uncertain of her true motives or goals. She admits to being a horrible person, willing to risk Krista's future just to see her one last time and emotionally manipulates her. Unlike her peers, she's painfully aware of just how much of a screwed up person she is and keenly aware of how messed up everyone else is as well.

* In ''Manga/{{Claymore}}'' you see several female Awakened Beings, which have the outward appearance of young girls. All right, man-eating monsters look like female teenagers. The most famous examples are Priscilla, Riful, and the female Awakened Being in the area of Gonahl. And all three of them had a single-digit rank as warriornesses.
* ''Manga/FutureDiary'' has the classmates of Ai who arrange a group rape for her because they do not like her. Her friend Marco comes too late to protect her, [[AssholeVictim but he can kill the boy who raped her]].
** Tsubaki, the Order's High Priest, also qualifies for this. She is cruel and evil and commands her followers to gang rape Yuno to get to Yukiteru. However, she was also a victim of sexual abuse.
** And above all, Yuno also counts. She is a 14-year-old, nice looking girl. But this is just a façade. In fact, [[AxCrazy she is a psychopathic serial killer]] who has [[{{Yandere}} developed an obsession to an innocent boy]], killing everyone she believes she stands in the way of her and Yukiteru.
* In ''VisualNovel/HigurashiWhenTheyCry'' there is a group of six friends, each of whom becomes a murderer in an Arc [[spoiler:(even Mion, as of Higurashi Gou)]]. [[spoiler:In the village, there is a dangerous local pathogen that makes people insane, paranoid and aggressive.]] Rika states that they're all genuinely sweet kids, however [[spoiler:the HatePlague causes them to become ''brutal'']]:
** In one arc NewTransferStudent Keiichi, a boy believes that his village murders two people each year, and he is the next to be in line, believes Mion and Rena to be out to kill him. He ends up killing them eventually. [[spoiler:Mion and Rena were actually innocent. Keiichi was delusional and simply believed everyone was out to kill him.]]
** In two different arcs, Shion develops a violent conscience [[spoiler:(later revealed to be the same HatePlague that also turned Keiichi and Rena into murderers, they can even "talk" to it and use reason to force it out of their minds)]] that drives her to become paranoid and aggressive. She kills several of her friends and some family members, in revenge for her crush Satoshi whom she has been made to believe was killed by them, thanks in no small part to the whole village also thinking that the local "curse" got to him. [[spoiler:None of the people involved were related in Satoshi's disappearance, they all assumed someone in the village did due to the curse, hence why Mion and Kimiyoshi told Shion he's most likely dead. In the final arc it's shown that Satoshi wasn't even dead, just in a coma inside the BigBad's lab.]]
** In one arc, Keiichi notices that his friend Satoko is being abused by her uncle, [[AssholeVictim and kills him shortly thereafter]]. His friends notice this, and try to give him a false alibi. Keiichi doesn't figure out that they're trying to save-face and thinks they're hiding something from him. [[spoiler:''Satoko'', a preteen, is actually the one who attempts to kill Keiichi in the end after mistaking him for murdering Rika. Keiichi survives but ends up with [[AGodAmI a God complex]] after believing he caused the entire village to die.]] One of the console arcs (Tsukiotoshi-hen) has a similar premise except Keiichi, Rena, ''and'' Shion all decide to kill Teppei together. It ends even worse.
** Then there is another arc in which Rena perceives that her father is being blackmailed by his new girlfriend, whereupon she kills her and her lover Teppei. This is only the beginning because she believes she is being persecuted by a mysterious organization which Mion belongs, resulting in her taking all the students of her school as hostages and was seconds away from blowing them all up with a homemade bomb. [[spoiler:Keiichi convinces Rena to back down through ThePowerOfFriendship. She is taken by the police out of town, which causes her to become the SoleSurvivor of the entire village after a "gas leak" occurs, although her survival is only shown in the anime.]]
** Shion, who has become Satoko's loving surrogate big sister, says she wants to kill Satoko's abusive uncle in one arc. Keiichi points out that deep down she doesn't actually want to do this and instead just wants everything to go back to normal without anyone having to become a murderer, not to mention that "losing Shion would make Satoko sad". This snaps Shion out of her emotional outburst and she ends up working with Keiichi to save Satoko legally. Incidentally, Keiichi admits in the visual novel that he also was planning to kill Teppei at first but Shion made him drop that idea since it gave him a flashback of a previous arc where that very same thing happened.

** Junhyeok Ryu: He’s runs his school with an iron fist [[ScrewTheRulesIHaveConnections on account of being the son of a congressman]]. He drove one classmate into becoming an outcast, ruining his family, drove him into taking his own life, just because the kid stood up to him when he tried to bully and frame a teacher! When TRPA exposes his father’s corruption, this leads him into becoming [[ATasteOfHisOwnMedicine he’s made the school’s new outcast]]. He gets so fed up, he decides to burn the school to the ground as payback. Good thing Hwajin stops him.

* This is, essentially, the point of Creator/SergeyLukyanenko's ''Knights of Forty Islands'', where a bunch of teenagers are kidnapped by aliens and put on small islands connected by narrow bridges, where they're given anger-activated swords and told that anyone who conquers all 40 islands gets to go home ([[spoiler:TheCakeIsALie, as all "kidnapped" kids are copies]]). The protagonists decide to make an alliance with the neighboring islands in order to peacefully or forcefully bring all islands under one rule. While it works for a short while, teenage hormones soon take over, and the alliance falls apart, as many of them just want to have power and sex (two of the betrayers are murdered in cold blood by the protagonist after they [[RapeIsASpecialKindOfEvil rape a girl]]).

** The female ones subtly imply that in order to keep her newfound popularity, she needs to buy various expensive goods, and suggests her into a CompensatedDating. But then, some of the same teenagers took pictures of her date and {{Blackmail}}ed her to reveal this (which will risk her being expelled) with sexual favors. When this happens, the female friends that suggested the dating in the first place start getting jealous that Saki gets all the boys' attention. Then they bully her and get the same boys do the same thing, which causes her to run off and after a few complications later, drop out of the school on her own accord.

** And finally, at the end of the manga, the same classmates encounter Saki, who has been through many traumatic experience, is broke, homeless, pregnant, addicted to drugs, but still trying her best to earn honest money, even if she's not using a more wholesome method. Not recognizing her due to her new GyaruGirl look is one thing, but then they decided to, for no apparent reason than [[ForTheEvulz the sudden kick to do evil]], assault and violate Saki while kicking her pregnant belly hoping to murder the unborn baby. Then they rob her hard-earned money, and leaves Saki completely miserable and eventually DrivenToSuicide and DyingAlone, while they pass the whole incident as "Doing a public service of removing unwanted filths".

* ''Film/TheWhale'': Ellie exemplifies this trope. According to her mother, she frequently got into trouble at school for severe behavioral issues. She is also incredibly hostile and aggressive towards Charlie when she visits him at his apartment complex.

* Rodrick Heffley from ''Literature/DiaryOfAWimpyKid'' is not only lazy and irresponsible, but also extremely rude to his family, especially Greg.

* In ''Anime/SailorMoon'', this is usually averted with Rei Hino (Sailor Mars), but it's played rather straight in the [=DiC=] dub, in which her treatment of Serena is borderline malicious.

* ''Film/TheWhale'': Ellie exemplifies this trope. According to her mother, she had frequently gotten in trouble at school for serious behavioral issues. She is also incredibly hostile and aggressive towards Charlie when she visits him at his apartment complex.

* This trope is used to its full potential in ''Manga/JojosBizarreAdventurePhantomBlood''. In the very first chapter, right after meeting the noble and courageous main character, a 12-year old [[LonelyRichKid rich boy]] named [[AlliterativeName Jonathan Joestar]], a blonde teen by the name of [[BigBad Dio Brando]] shows up and reveals that he's moving into his mansion and they will be brothers from then onwards. Little did poor [=JoJo=] know, Dio was a homicidal megalomaniac who believed his goal was to rule over the entire human race, and his first step towards becoming the king of the world was to torment Jonathan for all his life until he eventually got a hold of his inheritance. From Dio's POV, his ways of tormenting Jonathan includes (but is not limited to) physically abusing him, spreading false rumors about him so every kid in town hates him, humiliating him in a public boxing match (by playing dirty) burning his dog Danny alive, and [[spoiler:murdering Jonathan's father, who was his own adoptive father, to quickly get his hands on the money]]. But there is more: even after all of that happened, [[spoiler:Jonathan manages to defeat Dio more than once, but thanks to his [[EyeBeams vampire]] [[CombatTentacles powers]], he was able to kill Jonathan and [[GrandTheftMe steal his body]], which he would use to further torment and try to eliminate his descendants. And even after his death at the hands of those descendants, he kept disturbing the world's order via some wicked ideas of 'attaining Heaven' he had imprinted on his closest friend, who proceeded to reset the entire universe.]] Talk about a resentful dude.

!!Examples:

[[folder:Western Animation]]

* ''WesternAnimation/AmericanDad'': "1,600 Candles" has Stan and Francine dreading Steve going through puberty due to how angry and destructive his older sister Hayley was when she was developing.
* ''WesternAnimation/AngelaAnaconda'': The titular character's twin teenage brothers Mark and Derek.
* Parodied in ''WesternAnimation/{{Animaniacs}}'' via the ''Katie Ka-Boom'' shorts which took it to outlandish extremes; Katie ''literally'' [[VisualPun turns into a monster]] whenever she's upset. However, Katie's issue was implied to be a much more [[NoPeriodsPeriod specific teen problem]].
-->'''Katie:''' I am NOT overreacting! I'M A TEENAGER!
* ''WesternAnimation/{{Arcane}}'': [[Characters/ArcaneJinx Jinx]] post TimeSkip. Jinx is in her late teens and is also a mass-murdering psychopath/MadBomber who would commit acts of violence and cruelty on her own accord.
* ''WesternAnimation/AvatarTheLastAirbender'':
** Azula is nearly the lone exception to an otherwise {{subverted|Trope}} rule. [[spoiler:She's the one prominent teenager in the entire show that starts and remains evil from beginning to end. However, she ends up being exposed as a very tragic, messed-up person, so not many people in-show or out of it tend to see her as a "monster" anymore.]]
** The next most prominent example is [[WellIntentionedExtremist Jet]], who attempts to ''kick an old man in the head'' and flood a whole village of innocents in his intense rage towards the Fire Nation. He's the leader of a gang of teenagers willing to commit murder and other dark crimes for no other motivation than revenge and gets called a monster in-universe by [[TeamMom Katara]]. He's changed his approach by the next time we see him, insisting that nobody else will get hurt when he tries to expose two firebenders disguised as Earth Kingdom refugees, but is forced to learn that [[spoiler: RedemptionEqualsDeath]] when his plan backfires on him.
* Kevin 11 of ''WesternAnimation/{{Ben 10}}'' is an interesting inversion, in that he was an Azula-level AxCrazy EnfantTerrible [[TheSociopath sociopath]] as a preteen kid, but [[HeelFaceTurn calmed down]] into a genuinely heroic JerkWithAHeartOfGold by the time he actually became a teenager.
* ''WesternAnimation/CodenameKidsNextDoor'':
** A milder version of this trope, which is coupled with AdultsAreUseless. The dubious situation of teenagers is that they are being loyal minions, perhaps based on the logic that teenagers actively try to ''behave'' like adults. Although they also betray the adults as well, possibly in reference to the fact that teenagers are also more rebellious against adults than kids are (or just to show that they are indeed bastards).
** Many characters in the show enter an "outgrowing" phase shortly before their 13th birthday and become the rebellious bastard stereotype we know and love when they finally hit the big 13. [[spoiler: Though not all of them are affected by this. Some teens (and a few adults) are hired as black ops double agents for the KND.]]
** And there's Laura, who, whenever she gets angry (which is really easy), transforms into a monstrous teenager.
* ''WesternAnimation/TheCrumpets'':
** Caprice tends to be this out of the teenagers despite that she's not always evil. She can be cruel to her siblings like putting them to dangerous or graphic photo-ops so she can earn social media attention, and also towards her adoptive teenage cousin Cordless. She runs away from her family to live with her rich uncle and aunt (and risks replacing Cordless as their child), develop an autobiography of her new life and insulting her family and best friend Cassandra (after failing to read and respond to Caprice's text messages asking her to join) in one episode. She also dislikes animals and hurts them prominently in at least two episodes.
** Cassandra also counts sometimes, like when she gets rebellious at her mother (bonus points if she growls) or if she tries to [[RemovingTheRival prevent her crush from falling to a TV weather reporter]], whether she disguises as either of them or kicks the satellite dish on the Crumpet house.
* ''WesternAnimation/EdEddNEddy'': The Kanker Sisters are [[BarbaricBully Barbaric Bullies]] indicated to be teenagers. Lee, the oldest sister, is easily the worst of them.
* ''WesternAnimation/TheFairlyOddParents'': Vicky. She's consistently painted as an evil babysitter, but it only brings up her ''age'' when RuleOfFunny applies. More than likely that she has always been and will always be evil. Her age is a side-effect of being a babysitter. In one episode, she's a member of a whole club of evil teen girl babysitters. [[NegativeContinuity But it's not likely they'll be brought up again.]]
* Mac's 13-year-old [[BigBrotherBully older brother Terrence]] in ''WesternAnimation/FostersHomeForImaginaryFriends''. In the pilot (along with Duchess), he and her plan to kill Bloo, and most of his life is devoted to making Mac's a living hell. Additionally, while children typically make cute, friendly [[{{tulpa}} imaginary friends]], teenagers more often than not produce destructive {{kaiju}}.

* ''WesternAnimation/GravityFalls'':
** {{Parodied|trope}} in "The Inconveniencing". The abandoned convenience store Dusk 2 Dawn is haunted by the ghosts of Ma and Pa Duskerton, its former owners who didn't like teens hanging around the store in life "with their boomy boxes and disrespectful short pants", so they banned them. However, the teens retaliated... by playing incredibly tame rap music and dancing in the parking lot. Ma and Pa thought the lyrics were so hateful and shocking that they dropped dead from heart attacks on the spot.
--->'''Rapper''': ''Homework's whack, and so are rules! Tucking in your shirt's for fools!!''\\
'''Ma and Pa''': [[BigNo '''NOOOOOO!!!!''']] *dies*
** Robbie is portrayed like this for most of the series, and not just because of his rivalry with Dipper over Wendy's affection (which is ridiculous anyway due to Dipper’s age). In "Fight Fighters" he forces Dipper to fight him, even though Dipper is ''12 years old'', and acts like a brooding jackass almost every time he appears. He finally mellows out somewhat when he begins dating Tammy in "The Love God".
--->'''Soos''': I don't know, Dipper, teens are dangerous! Those hormones turn into like, killing machines! My cousin Reggie got in a fight with a teen once, and the guy broke like, all his arms, all his legs, and I think killed him or something. Me and Reggie were just talking about it.
* One episode of ''WesternAnimation/KingOfTheHill'' has a gang of teenage paintball delinquents making Hank and his buddies' life a living hell (to the point of doing drive-by shootings with the paintball rifles) just because he took a stand for Bobby earlier. The trope's even mentioned when they get Bill to pull a WoundedGazelleGambit so Hank and Dale could pick off two of them:
-->'''Hank:''' You were right, Bill. Teenagers ''are'' cruel. They'll pick on the slowest, heaviest... ''(realizes he's talking exactly about Bill)'' Well, the important thing is, you were right, Bill!
* ''WesternAnimation/MiraculousLadybug'':
** 13-15-year-old [[NewTransferStudent Lila Rossi]] is a ConsummateLiar and BitchInSheepsClothing who [[ItsAllAboutMe doesn't seem to care about anyone but herself]] -- come "Chameleon", even her crush on Adrien is tainted by spiteful motives.
** Félix Graham de Vanily, Adrien's [[UncannyFamilyResemblance identical cousin]], poses as him to try and ruin his friendships [[EvilIsPetty for no apparent reason]], and ''also'' tries to throw his lot in with Hawk Moth over a similarly petty goal as Lila (even though [[DramaticIrony he's doomed to fail]], as [[spoiler:he's planning to steal Gabriel Agreste's wedding ring, and Gabriel ''is'' Hawk Moth]]). At the end, he shows [[JerkWithAHeartOfJerk at best fake remorse for his actions]], and [[spoiler:still steals Gabriel's ring]]. And that's without getting into his actions in the season 4 finale, which saw him [[spoiler:willingly betray the heroes to Hawk Moth for his own selfish motives]].
** AlphaBitch Chloé had a few PetTheDog moments in earlier seasons, by by the end of season 3 {{Flanderization}} set in and fully turned her into this trope. Overall, she's spiteful, mean, couldn't care less about anyone besides herself, repeatedly abuses her peers and family, and [[spoiler:willingly teams up with Hawk Moth over petty reasons]].
* ''WesternAnimation/MotherUp'': Neighborhood teen Joel (the only teenager seen in the first season) hates everyone, especially his stepfather [[{{Cloudcuckoolander}} Greg]] who he repeatedly tries to maim, listens to harsh music, vandalizes things and plays ultra-violent video games.
* ''WesternAnimation/MyLifeAsATeenageRobot'':
** Britt and Tiff (aka the Crust Cousins).
** Brad, Jenny, and Sheldon toward Tuck on multiple occasions.
* The ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "Dragon Quest" reveals that this is a species-wide issue when it comes to adolescent dragons. At first, they're simply loud, obnoxious {{Jerkass}}es, but then it's revealed that one of the things they like to do [[ItAmusedMe for fun]] is [[WouldHurtAChild kidnapping and smashing phoenix eggs]]. When the eggs hatch, their leader decides that they'll [[WouldHurtAChild take the newborn babies instead]].
* ''WesternAnimation/ThePowerpuffGirls'':
** Two episodes featured the Smith family, one member of which was their angry teen son Bud. The first episode, Bud's entire appearance consisted of him yelling something typically teenagerish at his father, such as "I hate you!" and "No one understands me!" The second episode, which features the entire family as villains, provides every member of the family with a motivation for why they hate the Powerpuff Girls -- and Bud's is "I hate everything!"
** There's also the Gangreen Gang, a group of teenage delinquents with inexplicable green skin (the source of their name). They're not particularly successful criminals but tend to be a rather sadistic, destructive lot and indulge in cruel, petty crimes like bullying little kids or tormenting animals.
* The ''WesternAnimation/SouthPark'' episode "[[Recap/SouthParkS25E5HelpMyTeenagerHatesMe Help! My Teenager Hates Me!]]" features a group of teenagers that play at an air-soft field. They are all portrayed as vindictive, foul-mouthed, aggressive, and self-centered, ticking off all the box for negative stereotypes of teenagers. Gerald even tell his son, Kyle, that the brain of a teenager is equivalent to the brain of a psychopath.
* The vast majority of villains on ''WesternAnimation/StaticShock'' are superpowered teenagers. [[SubvertedTrope As are the heroes]].
* ''WesternAnimation/SupermanTheAnimatedSeries'' had an episode where Granny Goodness created a crime syndicate out of wayward teens in Metropolis, using Apokoliptian technology, love, and twisted sadism.
* Most of the Sherman High students in ''WesternAnimation/SymBionicTitan'' are pretty cruel to the show's main trio when they start school there. Some of them get better.
* ''WesternAnimation/{{Velma}}'': Velma grew from being an EnfanteTerrible to this in her teen years. She constantly shown herself to be a cruel, selfish, vengeful, and meanspirited person who uses her so-called friends as pawns, is a bigot towards anyone she views as more popular or privileged than her, and has a huge LackOfEmpathy for everyone else's problems. [[spoiler: Her most noted examples of her status is when she is the only one shown happy that Fred's Mom/Victoria Jones was killed by stalactite was hit by Norville's bullet and impaled her. All she cared about is that she "solved" the mystery and not the fact that Fred had to see his mother die so horribly, even if she was trying to remove his brain. Also she locked her father, his girlfriend, and her half-sister (who is a baby) out of the house so she could live with her mom only.]]
* ''WesternAnimation/TheWackyAdventuresOfRonaldMcdonald'': ''Scared Silly'' plays the trope for laughs at the end of the live-action FramingDevice, where Ronald [=McDonald=]'s dog Sundae is watching a sequel to the dinosaur movie he was viewing in the beginning and explains to Ronald that the sequel involves the baby dinosaur from the first film becoming a teenager with an appetite for destruction.
[[/folder]]

* ''WesternAnimation/CodenameKidsNextDoor'' follows the milder version of this trope. It couples AdultsAreUseless with the dubious situation of teenagers being loyal minions, perhaps based on the logic that teenagers actively try to ''behave'' like adults. Although they also betray the adults as well, possibly in reference to the fact that teenagers are also more rebellious against adults than kids are (or just to show that they are indeed bastards).

* ''WesternAnimation/SupermanTheAnimatedSeries'' had an episode where Granny Goodness created a crime syndicate out of wayward teens in Metropolis, using Apokoliptian technology, love, and twisted sadism.
* ''WesternAnimation/AmericanDad'': "1,600 Candles" has Stan and Francine dreading Steve going through puberty due to how angry and destructive his older sister Hayley was when she was developing.
* Parodied in ''WesternAnimation/{{Animaniacs}}'' via the ''Katie Ka-Boom'' shorts which took it to outlandish extremes; Katie ''literally'' [[VisualPun turns into a monster]] whenever she's upset.
** Katie's issue was implied to be a much more [[NoPeriodsPeriod specific teen problem]].
-->'''Katie:''' I am NOT overreacting! I'M A TEENAGER!
* Two episodes of ''WesternAnimation/ThePowerpuffGirls'' featured the Smith family, one member of which was their angry teen son Bud. The first episode, Bud's entire appearance consisted of him yelling something typically teenagerish at his father, such as "I hate you!" and "No one understands me!" The second episode, which features the entire family as villains, provides every member of the family with a motivation for why they hate the Powerpuff Girls -- and Bud's is "I hate everything!"
** There's also the Gangreen Gang, a group of teenage delinquents with inexplicable green skin (the source of their name). They're not particularly successful criminals but tend to be a rather sadistic, destructive lot and indulge in cruel, petty crimes like bullying little kids or tormenting animals.
* The ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "Dragon Quest" reveals that this is a species-wide issue when it comes to adolescent dragons. At first, they're simply loud, obnoxious {{Jerkass}}es, but then it's revealed that one of the things they like to do [[ItAmusedMe for fun]] is [[WouldHurtAChild kidnapping and smashing phoenix eggs]]. When the eggs hatch, their leader decides that they'll [[MoralEventHorizon take the newborn babies instead]].

* Azula of ''WesternAnimation/AvatarTheLastAirbender'' is nearly the lone exception to an otherwise {{subverted|Trope}} rule. [[spoiler:She's the one prominent teenager in the entire show that starts and remains evil from beginning to end. However, she ends up being exposed as a very tragic, messed-up person, so not many people in-show or out of it tend to see her as a "monster" anymore.]] Probably the next most prominent example is [[WellIntentionedExtremist Jet]], who attempts to ''kick an old man in the head'' and flood a whole village of innocents in his intense rage towards the Fire Nation. He's the leader of a gang of teenagers willing to commit murder and other dark crimes for no other motivation than revenge and gets called a monster in-universe by [[TeamMom Katara]]. He's changed his approach by the next time we see him, insisting that nobody else will get hurt when he tries to expose two firebenders disguised as Earth Kingdom refugees, but is forced to learn that [[spoiler: RedemptionEqualsDeath]] when his plan backfires on him.
* Britt and Tiff (aka the Crust Cousins) from ''WesternAnimation/MyLifeAsATeenageRobot''.
** Brad, Jenny, and Sheldon toward Tuck on multiple occasions.
* The vast majority of villains on ''WesternAnimation/StaticShock'' are superpowered teenagers. [[SubvertedTrope As are the heroes]].
* Kevin 11 of ''WesternAnimation/{{Ben 10}}'' is an interesting inversion, in that he was an Azula-level AxCrazy EnfantTerrible [[TheSociopath sociopath]] as a preteen kid, but [[HeelFaceTurn calmed down]] into a genuinely heroic JerkWithAHeartOfGold by the time he actually became a teenager.

* Most of the Sherman High students in ''WesternAnimation/SymBionicTitan'' are pretty cruel to the show's main trio when they start school there. Some of them get better.
* ''WesternAnimation/EdEddNEddy'': The Kanker Sisters are [[BarbaricBully Barbaric Bullies]] indicated to be teenagers. Lee, the oldest sister, is easily the worst of them.
* ''WesternAnimation/MotherUp'': Neighborhood teen Joel (the only teenager seen in the first season) hates everyone, especially his stepfather [[{{Cloudcuckoolander}} Greg]] who he repeatedly tries to maim, listens to harsh music, vandalizes things and plays ultraviolent video games.
* ''WesternAnimation/GravityFalls'' parodied this in "The Inconveniencing". The abandoned convenience store Dusk 2 Dawn is haunted by the ghosts of Ma and Pa Duskerton, its former owners who didn't like teens hanging around the store in life "with their boomy boxes and disrespectful short pants", so they banned them. However, the teens retaliated... by playing incredibly tame rap music and dancing in the parking lot. Ma and Pa thought the lyrics were so hateful and shocking that they dropped dead from heart attacks on the spot.
-->'''Rapper''': ''Homework's whack, and so are rules! Tucking in your shirt's for fools!!''\\
'''Ma and Pa''': [[BigNo '''NOOOOOO!!!!''']] *dies*
** Robbie is portrayed like this for most of the series, and not just because of his rivalry with Dipper over Wendy's affection (which is ridiculous anyway due to Dipper’s age). In "Fight Fighters" he forces Dipper to fight him, even though Dipper is ''12 years old'', and acts like a brooding jackass almost every time he appears. He finally mellows out somewhat when he begins dating Tammy in "The Love God".
--->'''Soos''': I don't know, Dipper, teens are dangerous! Those hormones turn into like, killing machines! My cousin Reggie got in a fight with a teen once, and the guy broke like, all his arms, all his legs, and I think killed him or something. Me and Reggie were just talking about it.
* ''WesternAnimation/TheCrumpets'' tends to have Caprice as this out of the teenagers despite that she's not always evil. She can be cruel to her siblings like putting them to dangerous or graphic photo-ops so she can earn social media attention, and also towards her adoptive teenage cousin Cordless. She runs away from her family to live with her rich uncle and aunt (and risks replacing Cordless as their child), develop an autobiography of her new life and insulting her family and best friend Cassandra (after failing to read and respond to Caprice's text messages asking her to join) in one episode. She also dislikes animals and hurts them prominently in at least two episodes.
** Cassandra also counts sometimes, like when she gets rebellious at her mother (bonus points if she growls) or if she tries to [[RemovingTheRival prevent her crush from falling to a TV weather reporter]], whether she disguises as either of them or kicks the satellite dish on the Crumpet house.

* ''WesternAnimation/AngelaAnaconda'': The titular character's twin teenage brothers Mark and Derek.
* ''WesternAnimation/TheWackyAdventuresOfRonaldMcdonald'': ''Scared Silly'' plays the trope for laughs at the end of the live-action FramingDevice, where Ronald [=McDonald=]'s dog Sundae is watching a sequel to the dinosaur movie he was viewing in the beginning and explains to Ronald that the sequel involves the baby dinosaur from the first film becoming a teenager with an appetite for destruction.

* The ''WesternAnimation/SouthPark'' episode "[[Recap/SouthParkS25E5HelpMyTeenagerHatesMe Help! My Teenager Hates Me!]]" feature a group of teenagers that play at an air-soft field. They are all portrayed as vindictive, foul-mouthed, aggressive, and self-centered, ticking off all the box for negative stereotypes of teenagers. Gerald even tell his son, Kyle, that the brain of a teenager is equivalent to the brain of a psychopath.