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->'''Buffy:''' I told one lie, I had one drink.\\
'''Giles:''' Yes, and you were very nearly devoured by a giant demon snake. The words "let that be a lesson" are a tad redundant at this juncture.
-->-- ''Series/BuffyTheVampireSlayer'', [[Recap/BuffyTheVampireSlayerS2E5ReptileBoy "Reptile Boy"]]

The tendency of the MonsterOfTheWeek to conveniently fit to the episode's theme and [[AnAesop Aesop]] in its appearance and mannerisms, even if they were supposed to be random.

This is frequently [[JustifiedTrope justified]] in one way or another. In some series, there's an inherent property of the Monsters of the Week that makes them tend to follow this trope, even tailoring their SculptedPhysique to fit that theme. Other times, the villains are actually inspired by or even taking advantage of the plot of the episode.

Often the monster's nature can be connected to a DoubleAesop, either on learning its origin or finding the way to defeat it.

See also MonogenderMonsters and AstonishinglyAppropriateAppearance. Subtrope of SpaceWhaleAesop.

----
!!Examples:

[[AC:{{Anime}} and {{Manga}}]]
* In various versions of ''PrettyCure'', the monster is formed from handy, usually inanimate objects, so if any one thing has been the focal point of the episode, there's a good chance the girls will end up fighting it at some point. Of course, the MonsterOfTheWeek is just as frequently something random, like a piano or a planter or a [[RocksFallEveryoneDies gazebo]].
** ''Anime/HeartcatchPrettyCure'' averted this - while an inanimate object was used, the monster was formed by a "Person of the Week"'s withered "Heart Flower", altered due to a problem that's weighted their heart's down. Evidently, it usually leads to the heroines to beat the monster by talking before using their powers to fully purify them.
* ''Anime/MazingerZ'': In episode 41 Kouji is undergoing a hard pilot training to be able to fly Mazinger-Z at high altitude. However he resents many aspects of the training, like being on a diet,and he even got in a fight with Sayaka because she wanted him eating the diet food she had made and he refused. Of course, in that episode [[BigBad Dr. Hell]] designed a [[{{Robeast}} Mechanical Beast]] -Karma K5- capable to fly higher and faster than Mazinger-Z, and [[TheDragon Count Brocken]] crafted a strategy to exploit that advantage. Kouji got hurt and even fainted due to physical strain and exhertion, and later he apologized to Sayaka, admiting he should have listened to her and eaten the meal she had fixed.
* In the SuperRobotGenre anime ''Anime/ZettaiMutekiRaijinOh'', the monster seeds were specifically activated by the word "meiwaku" (troublesome, problem) being used in a phrase, and would then take on the form/powers of whatever was being considered a problem by the speaker. So there was a traffic jam monster, a flu monster, a superhero monster (this one had some serious "what side am I on again?" issues) and so forth.
* In ''Anime/SailorMoon'', it often occurred either because the monster inherited the human host's traits in grotesquely exaggerated form, or because it possessed an inanimate object owned by the VictimOfTheWeek and somewhat connected to the episode's plot. Most of the monsters in the first few episodes didn't follow this precisely, mainly being heavily bowdlerized versions of ''Anime/CuteyHoney''-type monsters.
** At least one example [[{{Anvilicious}} wasn't backed up at all]]. There were [[ThoseTwoBadGuys twin demons]], called Castor and Pollux, who maintained [[PowerOfFriendship close relations and perfect conformity in actions]] and even ''had their tails knotted together''. Of course they reiterated the importance of cooperation like every five seconds. They held rather well against the Sailors, but then [[AssPull all of a sudden]] started to argue about who's going to finish the beaten girls and in about two seconds their friendship was over, their link broken and they were summarily wiped out.
* ''Creator/{{CLAMP}}'' has used this a few times in both ''TokyoBabylon'' and ''[[{{XXXHOLiC}} XXXHOLiC]].''
* All the X Eggs in ''ShugoChara'' stem specifically from self-confidence issues.
** Except in filler episodes when "? ("Mystery") Eggs" take on this role
* Pixy Misa in ''[[PrettySammy Magical Project S]]'' would frequently create a "Love-Love Monster" from an object linked to the story (e.g. P.E. equipment, a chemistry vial, a comic book, etc.).
* ''Anime/NeonGenesisEvangelion'' features this occasionally with the Angels, the most notable example being Israfel, which forces Shinji and Asuka to overcome their hostility towards each other to defeat it.
* In a similar vein to the Raijin-Oh and Sailor Moon examples above, ''Anime/GaoGaiGar'''s monsters of the week through the first half of the series were the manifestations of the stress that the host of the Zonder Metal was suffering from.

[[AC: Film]]
* Ursa from ''AfterEarth''. A monster that hunts ''solely'' by detecting emanations of fear, and is deaf and blind otherwise, makes absolutely no sense, especially since it was supposedly designed that way specifically to prey on human (advanced, star-faring humans, mind you, not cavemen), except as a visual representation of the protagonist's need to face and conquer his fear.

[[AC: Literature]]
* Evident to some extent in ''Literature/GalaxyOfFear'', though it's usually fairly minor - Zak is learning [[NeverGotToSayGoodbye how to let go of his dead parents]] in the same book that involves a {{Necromancer}} and {{Necromantic}} qualities - it's clearest in ''Spore''.

[[AC:LiveActionTV]]
* ''Franchise/PowerRangers''. [[Series/MightyMorphinPowerRangers Rita Repulsa]], in particular, did it all the time. In fact, most villainous plots from the first two seasons were inspired by what the Ranger teens were doing at school when the villains looked in.
** Zedd was, in a way, worst, as he'd make monsters from (sometimes Aesop-related) objects, allowing them to be even better tailored to the plot!
* In the ''Series/{{Charmed}}'' episode "Battle of the Hexes," Billie is rather outspoken about her beliefs that [[StrawFeminist Straw Feminism]] is better than real equality between the sexes. She learns the defects of this philosophy when she just happens to discover a magical belt that belonged to an [[LadyLand ancient Amazon queen]]. More or less by coincidence, the demon of the week also holds to StrawFeminist views.
* In the ''Series/BuffyTheVampireSlayer'' episode quoted above, Buffy and Cordelia go to a frat party. The one drink is, of course, drugged, though this being Buffy the girls are nearly devoured by a giant snake monster as opposed to raped. The next time Buffy tries drinking with frat boys, they all turn into cavemen (and cavewoman) stereotypes. Like most MonsterOfTheWeek shows, the monsters are often {{Anvilicious}}.
* ''Series/DoctorWho'' uses this every other story.

[[AC:VideoGames]]
* In a rare video game example, the Eidolons in ''VideoGame/FinalFantasyXIII''. Each of them are summoned when the related party member reaches their DespairEventHorizon. Conquering the Eidolon in battle always involves playing to the character's strength in battle and overcoming the character's FatalFlaw.
* ''VideoGame/{{Persona 4}}'''s Shadow bosses and their dungeons are all based around some mini-Aesop for a different character, about how they have to learn to accept themselves. So for example you have Chie's "[[Webcomic/{{hiimdaisy}} dominatrix banana-head]]" Shadow that represents her repressed resentment about Yukiko's greater popularity and joy at having the popular girl lean on her for support, which later leads her to have a more honest and mutually supportive relationship with Yukiko.

[[AC:WesternAnimation]]
* ''WesternAnimation/FilmationsGhostbusters'', to an extent. It doesn't quite work so well because Prime Evil continually relies on his "Usual Gang of Idiots" to do his bidding.
** There actually aren't very many episodes that use MonsterOfTheAesop. There are many episodes that have AN Aesop, but that's not the same thing.
* Each episode of ''YogisGang'' featured a villain who encouraged or reveled in bad behavior such as {{greed}}, bigotry, vandalism, or littering.
* A common theme on ''SushiPack'' is that the villain of the day will need (and usually fail) to learn the same lesson that one or more members of the Pack is struggling with.
* Common on ''TeamoSupremo'' where the villain's M.O. would often coincide with some issue one of the heroes was struggling with, such as a battle with Sloppy Joe coinciding with Brenda having problems with disorganisation.
* In the 2007 ''Film/TeenageMutantNinjaTurtles'' movie, the Turtles face a villain-led "brotherhood" while they themselves are having unity issues. Just prior to the final battle, the Turtles' family comes together as that of their enemy falls apart.
* In the ''WesternAnimation/TeenTitans'' episode "Forces of Nature", the other Titans are mad at Beast Boy for his non-stop, often dangerous pranks, which he unapologetically commits. The villains of the episode are then revealed to be Thunder and Lightning, a pair of superpowered brothers who turn out to be less evil than... a pair of pranksters who don't fully grasp they're hurting people. They and Beast Boy then learn the aesop about taking responsibility for one's actions together.
* In a certain way, [[MadGod Discord]] from ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fits this. The show overall is all about friendship [[ExactlyWhatItSaysOnTheTin (well, duh)]] and Discord is the spirit and living embodiment of... [[MeaningfulName well, guess]]. And his signature ability [[RealityWarper (well, aside from being able to do absolutely anything)]] is to invert personalities (turning positive into negative, of course), thus breaking friendships.
* An episode of ''[[WesternAnimation/BatmanTheBraveAndTheBold Batman: The Brave and the Bold]]'' featured an egocentric Captain Atom who constantly said that Batman wasn't a real hero because he didn't have powers. Then, the VillainOfTheWeek showed up and took his powers, making him useless. Of course, this being the show that [[NoFourthWall it]] [[LighterAndSofter was,]] [[JerkAss Cap]] [[ComicallyMissingThePoint didn't]] [[BrokenAesop get it]] [[SubvertedTrope at all.]]