-> ''"He was so learned that he could name a horse in nine languages; so ignorant that he bought a cow to ride on."''
-->-- '''Creator/BenjaminFranklin'''

Contrasting with the GeniusDitz, who, while usually foolish, has one area in which they are absolutely ''brilliant'', we have the Ditzy Genius who, while very intelligent and talented in several or many areas, has absolutely nothing in the way of common sense, logic, wit or tact.

This can occasionally be shown as naivete to the point of stupidity, and/or nigh-SuicidalOverconfidence / inability to see the danger in what they're doing. In any case, these characters end up landing themselves in trouble more often than not.

The primary difference between a Ditzy Genius and a GeniusDitz is that a Ditzy Genius has high general intelligence but is highly inept at something more mundane than their intellectual interests (social skills, for example) or lacks common sense, whereas the GeniusDitz usually seems dumb or clueless but is in fact highly proficient in at least one fairly specialised skill or field of knowledge. Contrast also BookDumb, which is a character smart in mundane life but abysmal in everything academic.

Sometimes this is a deliberate characterization decision made to give a highly intelligent character a FatalFlaw, or make them come across as [[IntelligenceEqualsIsolation weird]], or any number of other reasons. Other times it happens entirely by accident because the writers keep tossing the IdiotBall to a character who's (perhaps only [[InformedAbility because we're told as much]]) supposed to be academically brilliant.

See also CloudCuckooLander or BrilliantButLazy, especially in cases where the character's intelligence is largely {{informed|Ability}}. One of the standard Hollywood interpretations of a {{Nerd}}, the other two being the HollywoodNerd and the ExtravertedNerd. Very closely related to SmarterThanYouLook. Also compare AbsentMindedProfessor, who isn't foolish so much as forgetful. See also NoSocialSkills and SacrificedBasicSkillForAwesomeTraining.

----
!!Examples:

[[foldercontrol]]

[[folder: Anime & Manga]]
* ''Franchise/DragonBall'':
** Bulma from ''DragonBall'' is a prime example. While a mechanical genius and heir to a huge scientific corporation, she has absolutely no sense at all when it comes to dealing with danger. And yet somehow she gets the idea to become a treasure hunter. She gets only slightly better at this over the course of the series, in the sense that she doesn't walk headlong into danger without thinking first so much.
** It runs in the family, because her father, Dr. Briefs, is even worse--he's a genius in anything mechanical, but has absolutely no common sense.
* Lloyd in ''Franchise/CodeGeass''. Brilliant mecha designer, does not understand basic human interaction. The characters are shocked to hear that he is engaged. [[spoiler:It's an arranged marriage, since Lloyd is a Count. He was only interested in the match because of his fiancee's vintage GiantRobot]].
* Kirino Chiba of ''Manga/BambooBlade'' is frequently behaving in a ditzy, overexcited manner. She is also ranked 20th in her year at school. Not genius level, but highly respectable nonetheless.
* Miyako of ''Manga/HidamariSketch'' acts like she has a case of AttentionDeficitOohShiny, but her artistic and academic abilities are levels above the other characters-- she's one of the few people who is BrilliantButLazy but not BookDumb. That said, her use of GratuitousEnglish is also quite terrible...
* In ''Manga/HayateTheCombatButler'', Maria and Nagi have both skipped grades and know multiple languages. When they are split up while on a train, Hayate is torn between protecting his master or staying with the maid until Hinagiku shows up for a [[BigDamnHeroes less-than-fully-heroic rescue]] because they are completely clueless about the world.
* Tenpou in ''Manga/{{Saiyuki}} Gaiden'' brilliant strategist, but seems baffled by everyday life and would probably be buried under a pile of books almost permanently if it wasn't for Kenren.
* TeenGenius Hattori Heiji from ''Manga/DetectiveConan''. He's a brilliant detective who always keeps on par with Shinichi's deductions, but can't for the life of him remember to call Shinichi 'Conan' when they're in public. He also has a bit of a HairTriggerTemper, particularly when talking to his [[VictoriousChildhoodFriend childhood friend]] [[BelligerentSexualTension Kazuha]]. So much so that one [[http://www.fanfiction.net/s/3620272/4/An_Unprofessional_Opinion fanfiction]] diagnosed Heiji with Asperger's Syndrome in a fictionalized psych profile.
* Tamaki in ''Manga/OuranHighSchoolHostClub'' is rather ditzy. He also has the second highest grades in his year without even trying, to the frustration of some.
* Harumi Kiyama in ''Manga/ACertainScientificRailgun'' is a very intelligent scientist, but lacks even the most basic shred of common sense. For example, her thought process when it's hot essentially comes down to "It's hot, therefore I should take off some clothes." The fact that she's doing this in public doesn't occur to her. She actually becomes the source of an Urban Legend about a "Stripper Lady" because of this.
* [[IncomingHam Black]] from ''Manga/PokemonSpecial''. Type match-ups, move accuracy, evolutionary lines, detailed information on every Gym Leader and Elite Four member (including their team line-ups), Black studied them all before going out on his quest ToBeAMaster. Pity he has NoSocialSkills and feels that it's appropriate to shout out his dreams to people who are quickly going deaf.
* Joshua Lundgren of ''Anime/GunXSword'' is one of the greatest mecha engineers in the world... and doesn't understand why women scream when a guy walks into the girl's bathroom.
* ''Manga/{{Bleach}}'': Orihime is a straight-A student and third best in a 300-pupil year group. She also has black-belt karate skills ( downgraded to yellow belt in the anime) and is one of the two most gifted members of the Handicraft Club. Despite her genuine intelligence, she's also a CloudCuckooLander with a very active imagination resulting in her having sometimes bizarre reactions to mundane events.
* The title character of ''LightNovel/HaruhiSuzumiya'' is brilliant at most things she does, scoring incredibly high in all her classes and every sport she tries with minimal effort, but she utterly fails when it comes to anything that requires her to consider other people's points of view, like the movie she made. She thought it was brilliant; everyone else was... less enthused. At one point she fails to comprehend why [[DeathIsDramatic characters always die at the climax of a story]], and another time she complains that crabs didn't evolve softer shells so she could eat them easier. She also fails to realize that wearing a PlayboyBunny outfit at school would upset the teachers. And then there's her general InsaneTrollLogic, such as pointing out that Tanabata wishes will take years to reach their destination due to the speed of light delay, but expecting that Orihime and Hikoboshi will be able to ignore the lightspeed barrier because [[AWizardDidIt they're gods.]]
* [[GreatDetective L]] of ''Manga/{{Death Note}}'' is a Ditzy Genius (compared to [[GeniusDitz Genius Ditz Misa Amane]]) as he was stated by the author of Death Note to be the most intelligent character in the series, and has enough idiosyncrasies and few enough social skills that he can barely interact. Generally hyper-competent, he tends to fail in normal conversations and interpersonal relations.
* Sanae Dekomori from ''LightNovel/ChuunibyouDemoKoiGaShitai'' anime may be a {{Cloudcuckoolander}} out of her [[MsImagination delusions]], but she's still the top student of her grade, to Yuuta and Shinka's utter surprise.
* Mikogami Hayato of ''Manga/{{Sekirei}}'' graduated from college before the age of 15, and is cunning enough to outsmart the resident ManipulativeBastard. On the other hand, he's a [[{{Keet}} hyperactive teenager]] prone to AttentionDeficitOohShiny moments. He treats the Sekirei Plan like a super-exciting game of ''Franchise/{{Pokemon}}'', and expresses the desire to transform the world into something out of a video game if he wins.
** BigBad Minaka Hiroto was also this, before he became TheWonka.
* In ''Manga/{{Yuyushiki}}'', Yui sees Yuzuko as this. She does do well in school, but as Yui points out...
--> '''Yui''', on Yuzuko's {{def|iedtrope}}ying SmartPeopleWearGlasses: *She really is pretty smart. It's her ideas that are dumb.*
* ''LightNovel/{{Full Metal Panic}}'' features captain Teresa "Tessa" Testarossa. She is a tactical and strategic genius who became a captain in the international anti-terrorist organisation ''MITHRIL'' by the age of 16 and personally designed the submersible carrier ''Tuatha De Danaan'' which she commands. She is also a lovesick teenage girl and (apart from her talent for swimming) generally clumsy and slightly awkward.
[[/folder]]

[[folder: Comics]]
* LoisLane: A woman whose [[IntrepidReporter journalistic brilliance]] is matched only by her total inability to recognize sneaking into the villain's lair alone and unarmed just ''might'' be dangerous. And her [[ClarkKenting inability to recognise her boyfriend's face]].
* The [[NotAllowedToGrowUp perpetually six-year-old]] Calvin of ''ComicStrip/CalvinAndHobbes''. An example:
--> '''Calvin:''' Hey Mom, did you know that gravity in outer space works as if space was a soft, flat surface? It's true. Heavy matter, like planets, sinks into the surface, and anything passing by, like light, will "roll" toward the dip in space made by the planet. Light is actually deflected by gravity! Amazing, huh? And speaking of gravity, I dropped a pitcher of lemonade on the kitchen floor when my roller skates slipped.
--> '''Calvin's mom:''' (cleaning up the mess) [[LampshadeHanging How can kids know so much and still be so dumb?]]
* Jason from ''ComicStrip/{{Foxtrot}}''. The kid always does his homework, and gets incredibly high marks in school, and yet will pull off incredibly dumb, and sometimes dangerous stunts, half the time just to torture his sister.
* [[TheFlash Bart Allen]], aka Impulse I and later Kid Flash II. He's got an awesome PhotographicMemory and the ability to [[SuperSpeedReading super speed read]] an entire library ''in two hours''. He could rival [[Franchise/{{Batman}} Ora]][[ComicBook/BirdsOfPrey cle]] in terms of encyclopedic knowledge, but he's in [[CloudCuckooLander his own little world]] most of the time.
* A ''ComicStrip/{{Dilbert}}'' strip has the Pointy-Haired Boss interviewing a prospective job candidate:
-->'''Boss:''' Wow! You have three masters degrees and a [=PhD=]!
-->'''Interviewee:''' Yes, it's all very impressive, but interestingly, I have no common sense whatsoever.
-->'''Boss:''' That's not the sort of thing you should say during a job interview.
-->'''Interviewee:''' I don't see why not.
[[/folder]]

[[folder: FanFiction]]
* [[WesternAnimation/MyLittlePonyFriendshipIsMagic Princess Luna]] in ''Fanfic/{{Progress}}'' manages to be a brilliant leader, improving irrigation systems and the tax code and much more (not to mention being a [[PhysicalGod Physical Goddess]]), and [[HilarityEnsues set the microwave to 27 minutes when making popcorn]]. Being a FishOutOfTemporalWater helps.
* As revealed in the WhereAreTheyNowEpilogue of ''FanFic/TheNewRetcons'', [[spoiler: Robin Patterson becomes this: unable to live by himself, but was accepted into the physics program in a nearby university.]]
* ''Fanfic/FutariWaPrettyCureBlueMoon'' has [[{{Sensei-chan}} Ami-sensei]]. She's constantly given to speeches about hope and justice, chasing a promotion she's not sure will ever arrive despite her best efforts, and is the laughingstock of the school, but she's a GadgeteerGenius who can build anything from a super-toaster to an elaborate trap for the local PantyThief to an interdimensional communicator.
[[/folder]]

[[folder: Film]]
* ''Franchise/StarTrek'':
** Brilliant physics-defying engineer in ''Film/StarTrek'', Montgomery Scott, a man so intelligent, he came up with trans-warp beaming. A man so stupid, he decided to test the thing on Admiral Archer's dog, and promptly got himself [[ReassignedToAntarctica Reassigned to Delta Vega]].
** The "other" Scotty broke Kirk and [=McCoy=] out of Enterprise's brig, bragging that he knew every inch of the ship-- then promptly hit a beam and knocked himself out.
* ''Film/ABeautifulMind'' has John Nash, a mathematics wiz who will actually go up to a woman and say, "I don't exactly know what I am required to say in order for you to have intercourse with me. But could we assume that I said all that. I mean essentially we are talking about fluid exchange right? So could we go just straight to the sex. "
[[/folder]]

[[folder: Jokes]]
* There is an old joke about a professor who, at a university formal dinner, helps himself to some peas using his hand. When he realises what he's done, he excuses himself with "I'm sorry, I thought they were beans."
* Likewise, there's the old fable about Thales of Miletus, who was so busy studying the stars that he fails to pay attention to what's around him and falls down a well.
[[/folder]]

[[folder: Literature]]
* ''Literature/JakubWedrowycz'' is literally a genius, but comes across as a {{Ditz}}y old bum due, in part, to [[BookDumb poor general education]] (three years of elementary school back in the 1910's), though ObfuscatingStupidity also comes in play.
* Michael Sevenson in the ''Literature/KnightAndRogueSeries'' manages to be TooDumbToLive after having gone through a university. His complete inability to even tell a partial white lie, and his tendency to act without thinking (sometimes to the extent that he doesn't even realize he's acted until after that fact), not to mention his tendency to ignore social norms, make it surprising whenever he shows that he does, in fact, posses intelligence.
* ''Literature/HarryPotter'':
** Luna Lovegood of ''Literature/HarryPotter'' fame. She is a CloudCuckooLander almost to the point of ObfuscatingStupidity but she pulls out one genius move after another when it counts.
** Also nominated: Bellatrix [=LeStrange=]. Or possibly Helena Bonham Carter.
* Leonard of Quirm is the most intelligent man on the ''Literature/{{Discworld}}'' ... and has absolutely no comprehension of human nature whatsoever. The Patrician finds conversations with him a combination of relaxing (since he doesn't have to watch what he says) and frustrating (since Leonard comes up with things like "Yes, I've invented an incredibly powerful war machine, but that's okay because no-one would ever use such a thing.") ''Discworld/{{Jingo}}'' has him repeatedly shocked at Nobbs and Colon's constant ideas of how to use his inventions to attack others.
* ''Literature/AubreyMaturin'': Both Jack Aubrey and Stephen Maturin have elements of this, in contrasting ways. Jack Aubrey is an highly successful naval officer (which requires technical and mathematical knowledge as well as strategic and leadership skills) as well as an amateur astronomer and musician, but has a tendency to make poor choices when on land, especially in financial matters. Stephen is a physican/scientist/spy BadassBookworm ''par excellence'', but is utterly hapless at sea and something of an eccentric {{Cloudcuckoolander}}.
* ''Creator/SimonaAhrnstedt'' gives us Beatrice Löwenström in her debut novel ''Literature/{{Overenskommelser}}''. She's a very intelligent young woman, when it comes to academical and intellectual pursuits. But man, does she make some lousy decisions! When she's bullied into an engagement with a man, who's like forty years older than her and treats women like dirt, she never asks for help from anybody, who might actually want to and be able to help her. She also gets drunk at her cousins's engagement party (which could have ended much worse than it did), trusts her sociopath cousin (she shouldn't have) and tries to seduce male protagonist Seth when she has just fallen off a horse and gotten injured (not the right time)!
* And another Swedish example is Indra Ingridsdotter, the protagonist of "Röd måne" by Elisabet Nemert. She's such a brilliant medicine woman, that she eventually gets knighted by the queen. But she also has an extreme lack of common sense, when she has casual sex with many different men, even though she lives in the 17th century, when casual sex was against the law! It's not until after a scorned ex-lover has her thrown into prison, that she finally realises how stupid she had been...
[[/folder]]

[[folder: Live Action TV]]
* In ''Series/TheBigBangTheory'', Sheldon Cooper may be a brilliant theoretical physicist, but is insufferably arrogant, eternally confounded by social conventions, and almost completely ignorant of pop culture outside the sci-fi genre. However it may be that him being a genius is just an InformedAbility as he happens to think evolution is always towards superiority and has not achieved much in his field (or at least in the way of having one of his theories confirmed), he even made an arithmetic mistake in one paper he wanted StephenHawking to read.
* The Doctor in ''Series/DoctorWho''. He's eccentric, more than slightly manic, rarely compliments anyone's intelligence without mentioning his own, and has the ability to, without fail, sniff out and leap headfirst into any danger that his companion hasn't already stumbled into. Oh, and he's also a ridiculously competent Genius who's saved the Earth countless times, but that's nothing you'd be able to tell at first glance. Especially not if you're glancing at his [[InsufferableGenius sixth incarnation]]. Or [[TheWonka the Fourth.]] Or [[SophisticatedAsHell the Tenth.]] Or... [[TheNthDoctor any version]] of him for that matter. But Six was especially bonkers. Eight had a definite case of AttentionDeficitOohShiny going on, too, both in the movie and the Literature/EighthDoctorAdventures novels:
-->'''Eighth Doctor:''' A meteor storm. The sky above us was dancing with lights. Purple, green, brilliant yellow. ''YES!''
-->'''Grace:''' What?
-->'''Eighth Doctor:''' These ''shoes''! They fit '''perfectly'''!
* Reid from ''Series/CriminalMinds'' often qualifies, although he's working on it, in his odd Reid way. He's very good at numbers, statistics and abnormal psychology of all kinds, but no good at all, most of the time, at things like the unspoken rules of conversation and tact.
* ''Series/{{Bones}}''. Oh, Bones. So intelligent for solving crimes and yet so clumsy with social stuff... Because her understanding of human behaviour is more intellectual than intuitive, she forms conclusions that make perfect sense in theory, but are flawed in practice because humans themselves are flawed. It was heartbreaking when she told Booth she was going to adopt a dog that had been trained as a killer, only for Booth to tell her that the dog had been put down, because her protestations that the dog shouldn't have been blamed were ''right''.
* Kurt Hummel from ''Series/{{Glee}}'' is very intelligent and a fluent French speaker, but prone to moments of ditziness, such as his belief boxes have four sides or his plan to feed the doves at [[spoiler: Burt and Carole's wedding]] glitter.
* Alex P. Keaton from ''FamilyTies.'' He's a hypercompetitive straight A student and math genius who was doing his parents' taxes when he was five years old and advised his parents on mortgage rates when they bought their house. Yet in everyday activities he often proves completely incapable. His little sister frequently beats him in sports, he fails at things like building kites, cooking or fixing cars even with extensive directions.
* Carlton Banks from ''TheFreshPrinceOfBelAir'' may be a book-smart and highly intelligent first-class high school (later college) preppy, but he is especially naïve and [[ManChild immature]], especially in later seasons, and on multiple occasions seems to be ObliviousToLove. These areas are his cousin Will's expertise and he is often forced to (whether he wants to or not)bail Carlton out of social situations where such happens.
* Sherlock from, well, ''Series/{{Sherlock}}''. Justified as Sherlock only keeps important information in his "hard drive," which does not include tact, common sense or the idea of [[SesquipedalianLoquaciousness heliocentrism]].
* Lloyd Lowry from ''BreakoutKings'' has many elements of this.
* Prof. Hamilton on ''LoisAndClark'' had discovered a way to clone dead people with all their old memories and personalities intact, as well as a way to alter personalities. So he brings back Al Capone, John Dillinger, and Bonnie and Clyde. [[WhatAnIdiot Naturally, they all escape and wreak havoc across Metropolis]]. Lois even called him out on it.
-->'''Lois''': Hollywood's created a dozen versions of Frankenstein and you still didn't get the point.
* Alli Bhandari from ''Series/{{Degrassi}}'' is brilliant with math and science, an ace writer, and has a great memory. [[FatalFlaw However, she usually gets into bad situations based on her lack of people-smarts and street-smarts.]]
* Philip from ''Series/KamenRiderDouble'' has access to all the knowledge of the earth and is quite smart in his own right, able to figure out many things that Shoutarou can't. However, due to a MindWipe and being trapped in a factory placidly taking orders for eleven years, he doesn't know things that most people consider rudimentary. When he happens upon a subject that he finds interesting (a place, a food, a type of dance...) he will obsessively look up everything he can about it, oftentimes dressing up in zany outfits or trying nearly-suicidal activities just because he can. Also, especially towards the beginning of the series, he has NoSocialSkills.
* RecurringCharacter Professor Pepperwinkle in ''Series/TheAdventuresOfSuperman''. Example: he brought his latest invention to show Perry White. It was an (untested) time machine. Perry didn't have time to look at it because he was busy with an Important Story involving a gangster who was about to turn himself in to The Authorities, and who was in his office at the time; so the Professor turned his time machine on and sent them all (himself, the gangster, Perry, Lois, Jimmy, and Clark) to prehistoric times. Success!\\
\\
...then he realized he didn't bring enough fuel to make a return trip.
* The Solomons from ''Series/ThirdRockFromTheSun'' are all advanced aliens who could make fools out of even the smartest human beings, yet, because they have never dealt with emotions before, they come off as utterly crazy and weird to everyone around them. Dick, in particular, is a pompous manchild who can't even teach a young girl to play hopscotch without turning it into an argument.
* Leo in ''Series/{{Leonardo}}'' is possibly the smartest person in the world, but is incredibly easy to manipulate due to automatically believing in people, much to the despair of his StreetSmart friends.
* Commander Data of ''Series/StarTrekTheNextGeneration'' represents the pinnacle achievement of robotics, and is very likely the most intelligent officer in all of Starfleet. He is also routinely stymied by basic human interaction and language.
--> '''Chief O'Brien''': ...We'll be burning the midnight oil on this one.
--> '''Data''': [[ComicallyMissingThePoint That would be inadvisable]]...If you ignite a petroleum product on this ship at zero-hundred hours, you will activate the fire suppression system, which would seal off this entire compartment.
--> '''O'Brien''': That was just an expression.
--> '''Data''': Expression of what?
:::(Later)
--> '''Data''': It appears we will be required to ignite the midnight petroleum, sir.
* Moss from ''TheITCrowd'' is an extremely book smart technological genius, with NoSocialSkills and a rather absurd lack of common sense. When a fire broke out in his office, for instance, his reaction was to send a carefully worded E mail to the fire department, then sit there and wait for them to respond.
* ''TheWaltons'': Jim Bob. He's really smart, just lazy.
* Lulu from ''Series/TrueJacksonVP''.
* Screech from ''SavedByTheBell'' is an academic genius, but he can barely function in the real world. [[{{Flanderization}} It got worse over the years.]]
* Winifred "Fred" Burkle in ''Series/{{Angel}}'' may qualify. She's a skittish, timid, socially-awkward girl, exacerbated by her imprisonment in another dimension where she was viewed as little more than cattle for several years, to the extent she verges on {{CloudCuckooLander}} (at least in earlier seasons.) She also happens to be a quantum-physicist of near-genius intellect.
[[/folder]]

[[folder: Roleplay]]
* Dr. Shaw in Roleplay/DinoAttackRPG is a very intelligent and capable surgeon and even shows some talent as a counselor. On the other hand she's extremely unstable psychologically and spends a lot of time praying to a being she only half-believes in.
[[/folder]]

[[folder: Video Games]]
* ''VideoGame/SonicTheHedgehog'': Dr. Ivo "Eggman" Robotnik is a genius who [[ImprobablyHighIQ has an IQ of 300]], capable of singlehandedly building entire fleets of airships and space stations as well as armies of killer robots. However, he usually dresses his machines in garish colors, tends to throw temper tantrums whenever he's on the losing side and has a tendency to paste his face on everything. In addition to almost always including an incredibly obvious weak point in all of his robots (which is not unusual or unexpected for video game villains), special mention must be made of the Egg Dealer - a slot machine robot that had a random chance of attacking himself or even giving Shadow immediate access to his ultimate technique. Got to wonder what he was thinking when he programmed those particular features in.
* Rita Mordio in ''VideoGame/TalesOfVesperia''. A prodigy mage at the age of fifteen, but possessing absolutely no social skills. She's rude, direct, [[DisproportionateRetribution violently assaults those who bother her]] and cares nothing for other people. This can be chalked up to her young age and that she was raised (as an orphan) in a university town filled with self-absorbed scientists.
* Pascal in ''VideoGame/TalesOfGraces'' is a lot more sociable than Rita, but she's so energetic that she's nigh-incomprehensible when she gets excited, and she can't read social situations: she doesn't so much break the tension in a room as much as crash through it head-first. She also has no concept of personal space.
* Harold from ''VideoGame/TalesOfDestiny2'' is an eccentric, unpredictable, childish and sometimes downright psychotic young lady; yet, she is the genius behind the creation of the [[EmpathicWeapon Swordians]], and a magic expert. The writers of Vesperia seem to have taken a bit of her when making Rita; theory supported by a Harold mask usable by her (as an Attachment) and her Miska Doctoral Degree costume title, very reminiscent of Harold's garment.
* [[SuperMarioBros Luigi]] may qualify for this. When he's turned evil, he manages to build a giant killer robot that takes over two hundred hits with an alien space laser to go down in a couple of hours, owns his own airship (that he's implied to have built himself), is a master at card games, is explicitly stated to be the brains of the brothers, when Mario has a job which already requires someone to be very smart, and, yet, acts extremely childish when he's on adventures. On the other hand, [[WildMassGuessing it might all be an act to make himself seem less capable]].
* Merrill of ''VideoGame/DragonAgeII'' is a brilliant mage and historian well noted for her talents. She's also extremely naive, very socially awkward, and has little in the way a common sense (for some time she considered muggings to be some form of greeting). This is both played for laughs and treated seriously.
* [[VideoGame/TeamFortress2 Medic. Oh, Medic.]] He may look like [[GermanicEfficiency he has it fairly together]] on the field, but look a little closer and [[MadScientist you'll]] [[MadDoctor find]] [[ScienceRelatedMemeticDisorder out otherwise.]] For example, he apparently believes that the best way to talk to a patient during surgery (the patient being his HeterosexualLifePartner, no less) is to regale him with the story of how he lost his medical license (it involved removing the entire skeleton from a man who lived to tell the tale). It's fairly obvious that the man is both socially inept and generally round the twist.
** Australium poisoning has this and TestosteronePoisoning as its main effects. Radigan Conagher (Engie's grandfather), after working with australium for years, became intelligent enough to make a fully functional prosthetic limb, and dumb enough to saw his hand off to be able to use it, and Australia, the main source of this metal, is the most advanced country in the entire world, yet they elect their king by kangaroo boxing.
* The Sophon's of ''EndlessSpace'', they're just as likely to run away screaming from a planetary anomaly or study it despite being irradiated.
* Yukiko Amagi of ''VideoGame/{{Persona 4}}'' has a bit of this. Intelligence-wise, she's very smart, as her best friend Chie remarks that Yukiko always ranks near the top of the school charts when it comes to exams, and she's also often the one to make important deductions about the murder case the group is working on (up until [[KidDetective Naoto]] joins the group, anyway). On the other hand, she's capable of being very air-headed too, often displaying a remarkable ability to miss the entire point of a conversation (for instance, not knowing that a guy asking her to "go somewhere" with him was asking her out on a date, or thinking Yosuke is making a dirty remark when he suggests Yukiko give him some "private lessons" during a conversation about studying), and occasionally spaces out completely when others are talking to her.
* Lamia Loveless in ''VideoGame/SuperRobotWarsAdvance'' is a completely competent SuperRobot pilot - calm, analytical and deadly in battle. During her normal life, however, she tends to act ditzy. This is {{justified|Trope}}, since she is a RidiculouslyHumanRobot who was created mere years ago, and had only recently discovered what it felt like to be human.
** Yong Gebana of ''VideoGame/SuperRobotWarsOriginalGeneration: Dark Prison'' has a seemingly serious personality when it counts and apparently operates "by the book" most of the time. She has a slight obsession with data, which is represented by how she acquires and utilizes data constantly when in actual combat (Her debut chapter is called "Auditor Girl", referencing this). She has some slight "ditz" moments at times and we are usually shown her self monologues on which she usually "assorts" the current situation when she doesn't get something.
* Kiel of ''VideoGame/RuneFactory4'' takes great joy in reading books and learning about all sorts of things. However, he apparently failed to grasp the basic concepts of secrecy, deceit, or even just being a prankster, because he takes ''everyone's'' words at face value and can't keep anything in confidence - not that he deliberately goes around telling people, mind you; he just tends to let things slip when he shouldn't. He's also naive and inexperienced in the real world, despite his vast reading list.
[[/folder]]

[[folder:Visual Novels]]
* The writers of ''{{Tsukihime}}'' were apparently quite aware that the average reader was likely to dismiss Arcueid as an idiot. In truth, she's actually very intelligent and knowledgeable, she's just never had to pick up the skills that Shiki takes for granted. Which she points out. Plus, she's still a ditz.
* Kotomi in ''VisualNovel/{{Clannad}}'' regularly tops or at least places in the top ten of national grade/test averages and studies incredibly advanced physics in her spare time. She also doesn't seem to see much problem with using scissors on any science book [[spoiler:that mentions her parents or their work]] and reacts... very... slowly... to things, plus [[CloudCuckoolander many]] [[TheWonka similar]] traits that become more obvious with time. Watching her 'tsukkomi lessons' with Kyou and Nagisa can be both facepalm inducing and hilarious.
[[/folder]]

[[folder: Webcomics]]
* Molly in ''TheInexplicableAdventuresOfBob,'' an OmnidisciplinaryScientist with the personality of a child. Also Galatea, although these days Golly does a better job of at least ''looking'' worldly-wise, even if she's still incredibly naive.
* Palma from ''MushroomGo.'' She's an immature, loud mouthed teenager with a short attention span and poor grammar. She may also be the smartest [[VideoGame/SuperMarioSunshine Pianta]] in the world, and has spent most of her life lost in books.
* Brandi of ''WapsiSquare'' is beyond brilliant when it comes to planning, to the point where any unusual coincidence that worked to the favor of the protagonists can be attributed to her manipulations. She also fails to realize that flies drown when she flushes them down the toilet (she couldn't just shoo them outside because it was winter in Minnesota, and they would quickly freeze to death).
* In ''Webcomic/{{Sakana}}'', Taisei is incredibly smart and a talented {{salaryman}}. He's also incredibly silly and childish (but [[LoveYouAndEverybody well-meaning]]).
* Link is this in ''NintendoAcres'': Competent at being the hero of ''Franchise/TheLegendOfZelda'' games, has an incredible knowledge of literature, and can't open a door without using a bomb or boomerang.
* Brian Fitzpatrick in ''{{Rhapsodies}}'' is a gifted polymath, economist and accountant who can pretty much make numbers do what he wants. He is however impulsive with an extremely abrasive personality and is so socially clueless most people think he's an idiot.
* Fortiscue from ''Webcomic/CommanderKitty'' has shades of this. He has numerous amazing scientific accomplishments to his name, but between [[http://www.commanderkitty.com/2012/07/22/welcome-to-the-machine-2/ insisting that only the portable hard drive can be moved]] and [[http://www.commanderkitty.com/2012/11/04/plan-a/ mistaking CK for a janitor after a costume change even though they've been talking for the last few pages]], one has to wonder where exactly the little sheep's head is...
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[[folder: Web Animation]]
* So and So from ''WebAnimation/TeenGirlSquad''. She gets straight A's and prides herself on being an academic overachiever, yet is utterly devoid of anything resembling common sense.
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[[folder: Web Original]]
* Delta Spike from WhateleyUniverse is a prime example: a GadgeteerGenius who is especially well known on campus for the catastrophic explosions her devises cause when they inevitably fail, she tends to assume that everything will work perfectly and doesn't consider consequences. As one character put it, "She knows A plus B will equal C, but she fails to consider that there's a D, E, and F."
* [[VideoGame/HalfLife Gordon Freeman]] as depicted in ''Machinima/FreemansMind'' is a narcissistic, [[TheFool bumbling,]] [[BrilliantButLazy lazy]], [[CloudCuckoolander and overall bizarre]] human being who, among other things, built pillow forts out of plaster when he was a kid, got mad at zombies for not answering his questions, thought his mailman was spying on him, and stayed up for three days straight when he thought his house was being invaded by frog people. Some of his interactions with the scientists also show him to pretty inept and overall [[{{Jerkass}} dickish]] socially, and he's implied to go on drinking binges regularly as well as [[TheStoner get high on whatever's available.]] However, his inner monologues show that, despite all of this, [[CrouchingMoronHiddenBadass he's quite competent in combat]], is [[BunnyEarsLawyer actually very knowledgeable about theoretical physics]], speaks at least five languages (Haitian Creole, Spanish, German, Hindi and English), and has proven consistently more competent both physically and mentally than anyone else in Black Mesa.
* In ''[[DNAKPTS4TV Death Note: The Abridged Series (Kpts4tv)]]'' [[EvilGenius Light Yagami]] is characterized this way:
-->'''Light:''' ''[[BigOMG Oh my God]]'' I forgot my death note!
* ''Website/SFDebris'': Parody Janeway. On the one hand, she's a brilliant, if [[CardCarryingVillain malevolent]], engineer with a gift for [[MadScientist mad biology]]; on the other, she is remarkably prone to blundering into obvious danger and otherwise making disastrously bad decisions.
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[[folder: Western Animation]]
* Forge is portrayed this way in both ''WesternAnimation/XMenEvolution'' and ''WesternAnimation/{{Wolverine And The X-Men}}'', though in the latter it's more a case of BrilliantButLazy, while in Evolution he's energetic and brilliant, but somewhat foolish and lacking in foresight.
* [[WileECoyoteAndTheRoadRunner Wile E. Coyote]] is a genius capable of building roadrunner traps, [[FridgeLogic but if you think about it, wouldn't it be much easier if he just ordered food instead of ordering a bunch of supplies from ACME?]] Alas (for him, at least), he's simply too stubborn to give up.
* Shadowcat from ''WesternAnimation/XMenEvolution'' also qualifies. She's portrayed as a very intelligent student, but could be easily excited over "typical" teenage topics (driver's license) and early on had the tendency to use the word "like" so much in a single sentence, [[Franchise/ScoobyDoo Shaggy Rogers]] would take notice.
* ''WesternAnimation/TheMightyB'': Bessie Higgenbottom can do anything that will earn her a badge - including creating cold fusion or building a working robot with limited AI - but that doesn't make her any less of a ditz.
* Minor ''WesternAnimation/{{Daria}}'' character [[GuyOfTheWeek Ted]] fits this trope. [[HomeschooledKids He was homeschooled]] for most of his life, which gave him both an EncyclopedicKnowledge of everything and a ditzy lack of social skills.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' has Twilight Sparkle; A unicorn so smart, she knows most of the constellations by heart and was able to finish a race fifth place, ahead of a few dozen other, more athletic horses, simply by using her book smarts. She’s also a filly so silly, she needs to consult a reference book on something as simple as a sleepover. She even reads the book to find out what to do ''when a tree falls into her house,'' instead of just getting up and helping move it.
* The third season of ''WesternAnimation/GeneratorRex'' gives us Cesar Salazar, the formerly absent older brother of the eponymous Rex. Among his many achievements are: Working on the nanite project alongside his and Rex's parents, building a mobile lab capable of traveling at relativistic speeds, sauntering into Providence and casually neutralizing everyone between him and his kid brother, and [[spoiler: creating the [[AIIsACrapshoot insane AI, ZAG-RS]], which has nearly succeeded several times in [[ApocalypseHow destroying all life on Earth.]]]] When not performing feats of scientific awesomeness, however, it's clear that, against all logic, ''[[BunnyEarsLawyer Rex]]'', not known for being the smoothest guy around, got all the social skills in the family.
* Gadget from ''WesternAnimation/ChipNDaleRescueRangers''. She can make almost everything from almost anything, including rebuilding a plane out of garbage, but she simply does not register that in certain circumstances, certain behaviors are socially necessary or unusual.
* Dr. Drakken and Professor Dementor from ''WesternAnimation/KimPossible'' constantly produce [[MadScientist spectacular world-menacing gadgets]], but can't stop a couple of teenagers from [[FailureIsTheOnlyOption foiling their schemes]].
* Brain from ''WesternAnimation/PinkyAndTheBrain'' / ''WesternAnimation/{{Animaniacs}}'' regularly produces plans that are ingenious and lack any kind of common sense.
* Jack Spicer from ''WesternAnimation/XiaolinShowdown'', to the extent that the other characters tend to forget that he really ''is'' a genius.
* Roba from ''WesternAnimation/TheProblemSolverz''. He's the smartest member of the team, is knowledgeable about many subjects, and has built his own radar scanner. However, he's also very socially inept and childish.
* Heinz Doofenshmirtz from ''PhineasAndFerb''. He's a genius when it comes to science, technology, math, and engineering, but he lacks just about everything else such as social skills and common sense. He puts self-destruct buttons in a convient location on just about every invention he builds, and he's never even recognized his nemesis, Perry the Platypus, in even the most transparent of disguises, and tends to assume Perry is just an ordinary platypus if he's not wearing his trademark fedora. To put all this into perspective, take his scheme in the episode "Fireside Girl Jamboree": He was smart enough to build a machine that is capable of transforming metal into broccoli (A ''mineral'' into ''living matter''), but decided to make it ''[[FailureIsTheOnlyOption out of metal]]''.
* The title character of ''ScaredySquirrel''.
* ChildProdigy Dexter from ''WesternAnimation/DextersLaboratory'' definitely fits the bill. He's able to time-travel, create robots and build portals to other dimensions, but is utterly incapable of taking care of himself for a single day when his mom is sick. He doesn't know how to cook (having never heard of "flour"), and as for cleaning...
--> '''Dexter:''' [[MundaneObjectAmazement Could this strange phenomena be the substance Mom calls DUST?]]
** In the episode where he gets chicken pox, he ''has no idea what chicken pox even is.''
* Zim from ''WesternAnimation/InvaderZim'' is a scientific genius among races of scientific genius. He can build time machines, enhance elite positioning systems (to the point that GIR could point out individual exoplanets while indoors), mutate small house pets into kaiju-like monsters, slow down objects (including explosions) in time and space, hack into the Massive, and much more. However, he is still one of the least competent Invaders. Zim has little enough common sense to attack ''his own planet'' with a battle mech, commandeer a gargantuan maimbot to break open a faulty vending machine, accelerate a temporally slowed explosion ''before'' the Almighty Tallest would examine his operation (even [[TheDitz GIR]] realized that this was a bad idea), and uses [[PaperThinDisguise paper-thin disguises]] for himself, GIR , and his base. He's lucky that most humans are too idiotic to notice that he's an alien, or else he would have been discovered literally minutes after arriving on Earth.
* Plankton in ''WesternAnimation/SpongebobSquarePants'', despite being an evil genius he tend to over look simple things to which his computer wife Karen has to point out. Like the alphabet ends with Z, and he doesn't remember how to blink. He's able to make so many amazing inventions that not even ''humans'' can come up with, yet how does he decide to get money? ''By selling human resources at a dingy restaurant''. And in "Goo Goo Gas", he thought that baby powder was actually ''made'' from babies.
* Professor [=MacKrill=] from ''HelpImAFish'' he's a highly intelligent scientist who created a potion that can be used to turn other living beings into fish and vice versa, he easily forgets things and often makes up songs to help him remember.
* Po from ''WesternAnimation/KungFuPanda'': Capable of recreating {{Forbidden Technique}}s from inference or entirely on his own. Competent strategist. Encyclopedic knowledge of kung fu history, philosophy and lore. Achieved enlightenment in three days. SupremeChef. Skilled woodworker. Childish, clumsy, easily excited and dangerously lacking in common sense.
* Dick Dastardly from ''WesternAnimation/DastardlyAndMuttleyInTheirFlyingMachines'': He's skilled at mechanics and can build almost anything. But that's about all. He never plans ahead and spends his whole life trying to CatchThatPigeon.
* Tecna from ''WesternAnimation/WinxClub''. She's the smartest of the group when it comes to technology and science, but she can be absolutely clueless when it comes to anything unrelated. Early on in the show, she referred to a mop and bucket as "primitive devices". Flora had to guide her in using them, but wasn't specific enough, which made Tecna utilize the bucket as a helmet and the broom as an elongated feather duster.
* Jeanette from ''WesternAnimation/AlvinAndTheChipmunks''. She's very well-read, and book-smart, but otherwise lacks common sense and general intelligence, such as putting her shoes on the wrong feet, holding signs upside down, walking into doors or walls, tripping over untied shoelaces, falling down the stairs, among other things.
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[[folder: Real Life]]
* Some Dutch used to say: "Krankzinnigheid ligt dicht bij begaafdheid". This means as much as: "Crazyness is close to genius."
* Their ethnic cousins, the English, have a similar chestnut: "There's a fine line between insanity and genius."
* Kurt Gödel. He was an outstanding and truly deep-thinking logician and mathematician by whom AlbertEinstein was very impressed. He also very nearly failed his U.S. citizenship exam by blithely announcing that he had found an inconsistency in the U.S. Constitution which made a dictatorship possible. He wouldn't eat anything cooked by strangers, and when his wife was hospitalised for six months he was unable to figure out how to cook for himself. He eventually died of starvation.
* Anthony Weldon referred to King James I of England/VI of Scotland "The wisest fool in Christendom".[[note]]The full quote is: A very wise man was wont to say that he believed him '''the wisest fool in Christendom''', meaning him wise in small things, but a fool in weighty affairs.[[/note]]
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