[[quoteright:350:[[Franchise/{{Batman}} http://static.tvtropes.org/pmwiki/pub/images/coyne_pennyplunderer_7112.jpg]]]]
[[caption-width-right:350:Joe [[StevenUlyssesPerhero Coyne]] demonstrates the rationality and levelheaded demeanor typical of this trope as he begins his career as the Penny Plunderer.]]
->''"I used to be somebody in this town... now everybody's got a gimmick."''
-->-- '''The Riddler''', ''Franchise/{{Batman}}: Hush''

'''id-i-o-syn-cra-sy''': ''a characteristic, habit, mannerism, or the like, that is peculiar to an individual.''

'''cra-zy''': ''mentally deranged; demented; insane.''

The type of {{Supervillain}} who can only commit a crime a certain way. This goes way beyond the CallingCard. These villains will fixate on one idea, one ''thing'' that they will continue to use over and over, which eventually becomes their entire philosophy. Everything becomes about this ''thing''.

In real life, this is called [[http://en.wikipedia.org/wiki/Monomania monomania]], an obsessive fixation on one idea or thing or person. It's particularly common in {{Superhero}} fiction, where villains often only have one gimmick to establish their identity.

Compare BeatItByCompulsion. See also CallingCard, CriminalMindGames, TheGimmick. Frequently coincides with StevenUlyssesPerhero, with the villain's destiny apparently set from birth.

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!!Examples

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[[folder:Comic Books]]
* A great many Franchise/{{Batman}} villains:
** ComicBook/TheRiddler and riddles. Sometimes treated as an actual psychological disorder. At one point, he ''tries'' to stop leaving riddles, without success. Usually, though, he makes his disorder work for him, as the ''obvious'' answer to his clue masks the ''real'' answer, which is much more difficult to figure out.
** Cluemaster, the father of Spoiler, felt a compulsion to leave clues behind at the crime scenes, but he eventually got over it and stopped. Leaving clues, not committing crimes.
** ComicBook/TwoFace is usually compelled to commit crimes based on the number two or the concept of duality.
** SelfDemonstrating/TheJoker, DependingOnTheWriter, may only commit crimes based on the theme of jokes or pranks. Alternatively, the crime itself must be "funny" (albeit according to the Joker's own highly warped sense of humor).
** The Film Freak only commits crimes that are re-enactments of famous movie scenes.
** The Calendar Man (real name [[StevenUlyssesPerhero Julian Gregory Day]]) commits a different crime each day, but will ''re-create that crime exactly, one year later to the day.''
** The Black and White Bandit (real name [[StevenUlyssesPerhero Roscoe Chiara]]), a MadArtist who became obsessed with black and white after going colorblind. He's got a SkunkStripe in his black hair, he has a Dalmatian named Domino, steals things like antique chess sets, etc.
** Joe Coyne (pictured above) was a failure as a criminal. Not only was he regularly caught by the police ("coppers"), his crimes only netted him pennies. Thus, to get back at "coppers and pennies," he launched a career as the Penny Plunderer. A career that Batman ended on his very first outing, but Joe's theme outlived him; he (not, as is often assumed, Two-Face) provided the giant penny that [[SuperheroTrophyShelf became a fixture of the Batcave]].
** The SilverAge version of the Mad Hatter - the one with the red handlebar mustache - centered all his crimes around hats and other headgear.
* [[TheFlash Flash]] villain Rainbow Raider (real name [[StevenUlyssesPerhero Roy G. Bivolo]]), a failed artist who became obsessed with ''colors'' as a result of his colorblindness.
* {{Superman}}'s enemy SelfDemonstrating/{{Bizarro}} feels compelled to do the opposite of everything normal people do. This leads to some truly strange behavior, such as building a basement on top of his house.
* The ''ComicBook/PaperinikNewAdventures'' villain the Inquinator makes you happy that GarthEnnis never will write Disney comics: he is a ''musophile'', obsessed with dirt, filth and garbage, and his crimes are invariably ''littering and vandalism'' [[MundaneMadeAwesome made out to be something special]]. His first shown planned big heist was raining black ink down on the White House...
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[[folder:Films -- Live-Action ]]
* The villain in the ''Film/{{Saw}}'' movies is compulsive about his sadistic torture games, and becomes known and feared for them, his whole life seems to revolve around it. In fact, a major plot point in the later movies is being able to tell the real Jigsaw killer's death traps from those of a copycat using this trope; he ''always'' has to give the victim a means of freeing themselves from the death trap (as he firmly believes he's "helping" them better appreciate life by facing their sins through the game), whereas the copycats usually make the death traps inescapable.
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[[folder:Live-Action TV]]
* Though ''Series/TheMiddleman'' thinks the Palindrome (Ivan Avi) is like this, it turns out to be a subversion: he only left the mirrors behind because he thought he was a good artist.
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[[folder:Video Games]]
* ''VideoGame/TheWorldEndsWithYou'': Sho Minamimoto is obsessed with math and algebraic functions to the point where he uses them in his hints for each day's mission, but when you actually fight him... he kicks you. Over and over and over. No math except the ability to use it to create Taboo Noise, and [[spoiler:cast [[ShoutOut Level ''i'' Flare]] by reciting pi to a hundred digits.]]
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[[folder:Web Original]]
* The ''GlobalGuardiansPBEMUniverse'' featured several supervillains who were this: The Conundrum has to leave puzzles as clues; The Great White Hunter, who hunts superheroes for sport; and The Widdershins Man, who only commits crimes based on opposite concepts are only three examples.
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[[folder:Western Animation]]
* ''WesternAnimation/DannyPhantom'': Almost all the ghosts are like this about something.
** The Box Ghost and boxes. At one point, he even steals Pandora's Box.
** Technus at one point vows to stop announcing his secrets and plans all the time, which is apparently quite difficult for him (he eventually slips up and announces when he's about to make a getaway, which enables Danny to stop him).
* Most of the villains on ''WesternAnimation/DarkwingDuck'' fit into this. There's Quackerjack, who uses toys, and the cinematically-inclined Tuskernini, who "directs" his crimes as if he were a movie director, and Ammonia Pine, whose crimes invariably involve cleaning things up, and Splatter Phoenix, fixated on paintbrush artistry.
* WesternAnimation/KimPossible has fought her share of {{Idiosyncrazy}} villains: Duff Killigan, the homicidal golfer; Frugal Lucre, the world's cheapest criminal; and so on.
* Spoofed in ''WesternAnimation/{{Futurama}}'', "Less Than Hero", with the Zookeeper, who commits crimes using a pack of highly trained animals.
-->'''Fry:''' Pack of highly. Got it.
* Used ''extensively'' in ''WesternAnimation/WordGirl''. Take as examples:
** TheButcher, whose attacks all involve calling forth some type of meat.
** [[BuffySpeak Chuck the Evil Sandwich-Making Guy]], who uses a condiment gun (also parodied in that he, tired with the same old routine, tried to become the "Handsome Panther").
** [[GadgeteerGenius Tobey]], who continually uses giant robots to attack and destroy the city.
** [[FreakLabAccident Dr. Two-Brains]], who will only ever attempt to steal cheese.
** [[MesACrowd Lady Redundant Woman]], who's crimes mostly revolve around copying and redundancy.
* Most of the villains on ''WesternAnimation/CoolMcCool'' fit this mold.
* A number of ''WesternAnimation/SushiPack'' villains are like this: Oleander's various schemes are (usually) a ploy to eat the eponymous Pack, Paradoxter's crimes have an element of paradox and oxymoron to them (such as using literal jumbo shrimp as henchmen), and The Collector is always involved in collecting something when he shows up in the series, regardless of whether he's committing an actual crime.
* Parodied on ''WesternAnimation/DrawnTogether'' when Captain Hero convinces Xander to pose as a supervillain for him to defeat. The persona they come up with? Two Hands.
-->'''Xander:''' You'll never defeat me and my... TWO HANDS!!
* In the ''WesternAnimation/BatmanTheAnimatedSeries'' episode [[Recap/BatmanTheAnimatedSeriesE25TheClockKing "The Clock King"]], Temple Fugate is TheSociopath without any emotion, whose only interest in the world is being a ScheduleFanatic, clocks and time: he uses a TimeBomb triggered by an expensive watch, has an AbandonedWarehouse with a RoomFullOfCrazy Clocks, and conducts a BankRobbery by messing with a time lock. [[spoiler: All those tropes were exploited to lure Batman into a trap: Fugate acknowledges his obsession, and uses it against his enemies. The real]] EvilPlan is to kill someone in a ClockTower with the clock hands.
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