"If excessive ambition was the fault most commonly attributed to the middle class, failure to provide a suitable example and to care properly for their subordinates were the most common complaints against the rich. The aristocracy was widely seen as preoccupied with duels, London, adultery, foreign fashions, fox hunts, and gambling."
In One Piece, most of the nobles and every member of the World Nobles. The difference is that the World Nobles really don't have any contribution to society, but no one really cares because, due to their lineage, the World Government makes them completely above the law and lets them do whatever the hell they want. Anyone who opposes them risks either being shot or having an admiral on their ass. The only thing people find them useful for is taking advantage of their influence for noble (and not-so-noble) causes.
The princes Meleagros and Atalantes in Heroic Age are Upper-Class Twits who would have wiped out the entire human armada with their horrendously tenuous grasp of military tactics if it wasn't for the influence of the more intelligent and experienced Nilval Nephew. They almost certainly would never have been allowed anywhere near the bridge of a starship if it wasn't for their royal birth.
In Code Geass, some, if not most, of Britannia's royal family.
For half of her screen time in the first season, Euphemia is pretty ditzy, but turns that around and then she dies horribly.
Her eldest brother, Odysseus is permanently this: every time he's on screen, he's shown as an indecisive Nice Guy with no will of his own, and puppet to his Chessmaster second brother, Schneizel, and their father Charles. The only time he wasn't this was when Lelouch took over and became Emperor, as Odysseus was the only member of the royal family who tried to solve the problem peacefully instead of having him shot. Too bad Lelouch's Thanatos Gambit was in work already, so he only got Geassed for his troubles. Then Schneizel killed him when he nuked the capital.
The remaining members we see on screen are either the Anti-Hero, or have really, really poor decision making skills leaning towards unnecessary destructive tendencies.
Also worth mentioning is Gino Weinberg, one of the Knights of the Round, who's somewhat reminiscent of Ouran High School Host Club's Tamaki, both in physical appearance and general cluelessness about the workings of "commoner life". However, unlike his fellow Britannians he's cheerful about it and eager to learn more.
Subverted with Marechiyo Omaeda of Bleach. While he acts like a big buffoon and is regularly smacked around by his captain, he uses this trope as a form of Obfuscating Stupidity, leading his opponents to believe he's incompetent and only got his high position through connections and name, but is skilled enough to deserve his rank of lieutenant.
Kojiro Sasahara from Nichijou behaves in a fashion like this. He wears a frily ascot with his uniform, he always holds out his pinky when he drinks or even laughs. Despite these and a few Cloudcuckoolander traits, he's really more of an Upper-Class Twit wannabe, as he's revealed early to be the eldest son of a family of farmers.
Joe MacDonald in The Luck Of Dennis St Michel Viscount Stokington is one of these, being the non-working son of the local mayor. Subverted in that as much of a twit as Joe is, he's not nearly as upper-class as his best friend Dennis, who's the son of the local landowner and is far cleverer.
Films — Live-Action
Gemma Honeycutt from the film Fool's Gold is another dimwitted, celebutante heiress.
Many of Hugh Grant's roles fall into this trope, particularly in '90s comedies.
The heroines of the Hilary and Haylie Duff comedy Material Girls are classic airhead heiresses. They're actually pretty nice people but are extremely pampered and ditzy (to the extent of accidently burning down their own mansion).
Harvey Baylor in Planet of the Dinosaurs. He seems completely oblivious that he's trapped on a primitive alien world and often tries to use his former position as a company president to get the others to do things for him.
In the older (black and white) version of The Scarlet Pimpernel, Sir Percy acts like this once finds out that his wife is probably spying on him for the French. It's really just a show to fend off suspicion that he's helping French nobles escape to England.
Temptation Island has bitchy contestant Suzanne (Serafina in the remake), and the pageant coordinator Joshua.
Calvin Candie of Django Unchained is stated to be a francophile who prefers to be addressed as Monsieur Candie. He also doesn't speak a word of French and is shown to be fairly dim and repugnant as a person.
In Austria, Graf (=count) Bobby and his friend Graf Mucki are/were favorite targets for many jokes.
Bertie Wooster — so archetypal that this trope could have been named for him — whose skills are limited to stealing policemens' helmets and claiming to actually have legitimately won the Bible knowledge competition in school. Most of his friends are fellow members of the idle rich, and are even less intelligent. Thank goodness for his man Jeeves. To be entirely fair, however, Bertie is at least a sweet twit. He isn't intelligent, not by any means, but he's good-natured, generous and usually kind to the people around him, which makes him a damn sight better than most of the characters on this page. In the Stephen Fry / Hugh Laurie TV adaptation, he's also an excellent piano player (mainly because Hugh Laurie is an excellent piano player). Too bad he's too stupid to make something out of it.
P. G. Wodehouseloved this trope. Anyone with money in his stories is unlikely to be intelligent, especially if they're the main character. Could be the reason that his stories also have an above-average percentage of Servile Snarkers.
While several members of the nobility are rich idiots, the dumbest has to be Lady Arymilla of House Marne, who plans to take over Andor in a civil war. The only problem is that she's a complete idiot, whose success is largely due to a senile old man, and the fact that members of the Shadow are helping her. She's largely oblivious to the world around her, and only cares about herself. Honestly though, the readers really knew she had absolutely no chance whatsoever when it was revealed that she planned to use the entire nation's coffers just to erase her own debt. Once that was out in the open, any Genre Savvy reader knew right then that she was gonna suffer from a massively Epic Fail.
Lord Weiromon deserves special mention as well. He's the guy who always insists that the correct solution to any and all of life's problems, bar none, is a cavalry charge. Pikemen? Cavalry Charge! Spear-wielding warrior race? Cavalry Charge! Spellcastersmounted on giant pterodactyl thingsthat can explode you from half a league away? Cavalry Charge! One main character, upon hearing one of Weiramon's suggestions in a later book, commented to effect of "How are you still bloody alive?!?" Between this tendency and his miraculous ability to survive unscathed, it's been speculated that Weiromon is actually a Darkfriend whose purpose is to get as many soldiers as possible killed, so that they can't stand against the armies of the Dark One. Confirmed (as of Towers of Midnight).
"The road to Warsaw, perhaps," Prince Ippolit said loudly and unexpectedly. Everyone turned to him, not understanding what he meant to say by that. Prince Ippolit also looked around with merry surprise. Like everyone else, he did not understand the meaning of the words he had spoken. In the course of his diplomatic career, he had noticed more than once that words spoken suddenly like that turned out to be very witty, and, just in case, he had spoken these words, the first that came to his tongue.
The aristocrats in the novel Jingo!. The city-state of Ankh-Morpork is facing a war with Klatch (Fantasy Counterpart Culture to the Middle East). The Klatchian generals have lots of experience with war, while the Morporkian aristocrats have none, but the aristocrats wave that aside with the claim that the ability to lead war is hereditary, and their ancestors were great generals. The Morporkian soldiers have neither training nor experience, while the Klatchian soldiers have plenty of both (and outnumber the Morporkians to boot), but the aristocrats wave that aside with the claim that the Klatchians are savages and won't stand against the superior Morporkians. Take note, this IS coming from a group of people who believe that the best strategy is a full frontal assault, that if, after the battle, you subtract your fatalities from your enemies and get a positive number it was a great victory, that rudeness is the same as straight-talking, and that if you talk LOUD AND SLLLOOOWW enough anyone can understand you, even if they don't speak the same language.
The standard protagonist of Decadent fiction, as well as the standard author. You have to wonder if they'd be so filled with existentialist ennui if they quit moping around the house all day long and got jobs. The pinnacle of the Decadent novel (and this trope) was A rebours by Joris-Karl Huysmans, so recognized it was alluded to in The Picture of Dorian Gray as simply "the little yellow book." The entire novel is about a rich guy moving to his country house and then thinking of expensive and strange things to put in it, up to and including a tortoise with jewels embedded in its shell. Which dies because it has heavy jewels embedded in its shell.
Many of Sharpe's enemies fit this trope. They tend to end up dead.
They were careless people, Tom and Daisy — they smashed up things and creatures and then retreated back into their money of their vast carelessness, or whatever it was that kept them together, and let other people clean up the mess they had made.
Patrick Bateman's social circle in American Psycho. Lots of people probably think he's one too.
This appears to be the default state of being for all Hobbits above a certain wealth bracket in The Lord of the Rings, with rare exceptions (e.g., Bilbo and Frodo).
Pavel Young, de facto Arch-Enemy of one Honor Harrington for about four books. His pathological vindictiveness, cowardice, and utter inability to know when to cut his losses insured he was not around for book five.
Captain Michael Oversteegen, of the same series, is a subversion. He is deliberately given just about every possible trait of an Upper-Class Twit from his culture (many of them affected, some still genuine) except for actually being a twit. He's as competent as he is irritating, and as compassionate as he is both. (Well, to people not currently trying to kill him, anyway.)
The Gaunt's Ghosts novel His Last Command has Dev Hetra Captain Sire Balthus Vuyder Kronn. Impeccably dressed, sees Ludd as uncivil... is a horribly scared neophyte at war. Although the first impression of the Dev Hetra in general is that they're an entire regiment of twits, they perform their jobs admirably enough once Ludd gets over his astonishment and puts the fear of the Emperor in them.
In the course of his career Ciaphas Cain met exactly two planetary governors who were both competent and loyal, both of whom suffered unfortunate fates later. The rest were treacherous and/or blithering idiots due to generations of aristocratic inbreeding.
Sir Percy Blakeney uses this as an Obfuscating Stupidity disguise to hid the fact that he is The Scarlet Pimpernel. That, and it really ticks off his arch enemy, Chauvelin... which he really, really enjoys doing.
Oliver Rushton in Sorcery and Cecelia. His idea of riveting conversation is to discuss the knotting of a tie.
Vorkosigan Saga: Ivan Vorpatril does such a good impression of this he even fools his immediate family — until he thoroughly blows his cover in A Civil Campaign. The considering look in his Imperial cousin's eye tells Ivan he is going to seriously regret comming out of his closet.
Considering that Miles picks Ivan as an assistant when doing an Imperial Audit on Imp Sec of all places long before that, one would guess that he wasn't really fooled as much as he pretended to be.
By Vorrutyer is a more extreme version both in the degree to which he takes his "twitiness"(Ivan's image is no worse then a lazy and oversexed but reasonably likeable courtier; By attends orgies well supplied with drugs and drink), and in the goal of his perceived "twitiness"(Ivan just wants to make sure he looks to stupid for someone to tag him as a front for deadly court intrigue, By is an undercover agent purposely trying to smoke out intriguers).
Song at Dawn: Most of Alienor's ladies-in-waiting are spoiled, bitchy and otherwise unpleasant to be around.
Tai-Pan: William Longstaff isn't a complete imbecile, but he is kind of dim, very set in his Victorian upper-class mentality and not particularly decisive, which makes him a very bad man to deal with the self-made China traders and Imperial officials his job as Governor of Hong Kong requires him to deal with.
Arthur Huntingdon and his cadre in The Tenant of Wildfell Hall. Helen muses at one point that her husband might be a better man if he didn't have so much free time.
Named for the sketch "Upper Class Twit of the Year", where five Upper-Class Twits compete in events like "Kicking the Beggar" and "Taking the Bras Off the Debutantes", finishing with the winner being the first to shoot himself.
There were many other examples, such as the family in the "Tinny Words" sketch, who have nothing better to do all day than sit around classifying words as either tinny- or woody-sounding. From the other side, in the "Flying Lessons" sketch, the man claiming he's flying and not hanging from a wire avoids arguing the point by turning it into class warfare:
Terry Jones: I came here to learn how to fly an aeroplane! Graham Chapman: Oh! An aeroplane. Oh I say, we are grand, aren't we? Oh oh, no more butter scones for me, mater, I'm orf to play the grawnd piawno! Pardon me while I fly my aeroplane! Now get on the table! Terry Jones: No one in the history of the world has ever been able to fly like that! Graham Chapman: Oh, I suppose mater told you that while you were out ridin'!
The various incarnations of Percy and George in the series. The latter played by the same actor as Bertie Wooster; Hugh Laurie tended to play characters of this type quite a lot when he was younger, which tends to shock American audiences who only know him in his House incarnation. While those who were more used to his Upper-Class Twit roles from before House often took quite a while to stop expecting House to goggle mindlessly or burst into Upper-Class Twit Speak ("I say, Jeeves, this fellow's looking jolly green about the gills, what?").
Incidentally, the portrayal of George IV as an Upper-Class Twit is more or less spot-on; he was fond of partying, had no idea how to use money (he got into over the equivalent of £5,000,000 in debt before taking the throne two or three different times), and is generally considered to have been a bad king (his brother William, who was almost as dissolute in his youth, is much better-regarded).
Hugh Laurie played a female one in an A Bit of Fry and Laurie sketch, opposite Stephen Fry as the Duke of Northampton. And the very dark "Jack and Neddy/Teddy" sketches from the show, in which Fry manipulates him into acts like planting a bomb in a restaurant, have been described as what Jeeves and Wooster would have been like if Jeeves used his powers for evil.
Most of the members of the Bluth family in Arrested Development fall into this trope to varying degrees, with Gob and Buster being the strongest examples. The show itself is largely based around exploiting this trope and how wealthy twits deal with being separated from their money (i.e. poorly).
London Tipton from The Suite Life of Zack and Cody is a good example of the heiress subtype (a hotel heiress named after a European capital... hmm). If she was bit crueler and considerably smarter she might qualify as the Rich Bitch, but her self-absorption seems to stem more from being one of the stupidest characters on television than any intentional malevolence. Meanwhile, her father, Mr. Tipton, is never shown on screen and will frequently be busy with business dealings instead of spending Christmas or other special occasions with her daughter, and the fact that London also seems to have a Missing Mom does not help matters.
Just about every character played by Penelope Keith is a likeable but dim upper-class twitess.
Jefferson D'Arcy from Married... with Children believes that he should live in a one-income household because he's "too pretty to work", and he rebuffs any and all attempts by his wife Marcy to get a job. Marcy's ex-husband, Steve Rhoades, worked in the banking business along with her...until they divorced and he went crazy.
Traci Van Horn from Hannah Montana falls solidly into the airhead heiress variety. Some might put Hannah Montana herself in that category.
The Fresh Prince of Bel-Air: Hillary, particularly early on when she frequently championed environmental conservation while invariably demonstrating in the process that she is neither knowledgeable in nor especially devoted to the subject (fittingly, this character trait is dropped altogether by the end of the first season). The rest of the Banks children could qualify as well, especially Carlton. The same can't be said of their parents Phillip and Vivian though, as both of them came from common origins and achieved success by dint of hard work. Interestingly enough, Will started out as being the streetwise kid who was totally unlike the rest of the family... but the show hinted in at least one episode that Will became more and more like the Banks after having lived with them for awhile. Will's reaction when this dawns on him can only be described as hilarious.
Mad King George makes a few brief appearances in Sharpe.
Nathan Barley's eponymous protagonist. The character was created by Charlie Brooker and first appeared in his TV Go Home book, which revealed Barley lived off cheques from his parents and spent his days working out "which job to pretend to do next". In the series he spends his parents' money on an office full of video editing equipment and gives himself the job title "self-facilitating media node".
The "University Challenge" episode of The Young Ones places the four main characters, who attend the lower-class Scumbag College, on a game show against four Upper Class Twits from Footlights College. Much to the chagrin of the Scumbag students, the Footlights students are able to earn all of the game show's points through bribery and nepotism despite the fact that they respond to questions with moronic non sequiturs like "I've got a Porsche!"
In Parks and Recreation Leslie's opponent for city council, Bobby Newport, is the son of the man who employs half the town. He is so used to being given everything in life that he has difficulty comprehending someone competing with him. When she runs a mildly negative ad, he complains that it hurt his feelings and asks her to abandon her campaign so he can win. He doesn't understand why she refuses. That's not him getting mad at her for refusing, mind you. That's him failing to comprehend the concept of someone not wanting to please him.
Jean-Ralphio and his twin sister Mona Lisa are also portrayed this way. They are both portrayed as obnoxious childish freeloaders who often screw Tom over. It is also revealed that Mona Lisa has convinced her father that she is a complete angel.
While in London, Ben meets with Lord Covington to get a grant. Turns out His Lordship is as big a Man Child as Andy, whom he takes a liking to.
In Buffy the Vampire Slayer, its revealed that before becoming a vampire, Spike was once known as William Pratt, a meek, effete young Victorian Gentlemen and Momma's Boy. His sobriquet of "William the Bloody" actually derives from the fact he wrote bloody awful poetry.
Rachel in Friends is presented this way in the beginning of the series. After running out of her own wedding that was most likely funded by her wealthy parents, Rachel moves into an apartment that her best friend, a working middle class woman, lives in. Rachel is shown to be completely clueless in the most basic tasks, such as taking out the garbage or knowing who ordered what in the coffee house. Rachel does get better over time and manages to shed most, if not, all of her twit.
Giles Wemmbley-Hogg (two Ms, two Gs) from Giles Wemmbley-Hogg Goes Off — a rich, privately educated student on his gap year before university, travelling the world attempting to do good, but hopelessly naive as to what that involves. For example, he decides to try to rebuild the Great Wall of China.
Foxbat from the Champions universe was this before the loss of his family fortune turned him into the world's most eccentric supervillain.
In the Forgotten Realms setting, Giogioni Wyvernspur enters the story as one of these. He proceeds to show unexpected depths and develop into a pretty decent hero. Danilo Thann, however, was faking it from the word go.
The Peers in Iolanthe are proud of their Blue Blood, though they have to admit that it hasn't given them much in the way of brains. The generally useless quality of the nobility is celebrated, specifically in Lord Mountararat's solo "When Britain Really Ruled the Waves":
When Wellington thrashed Bonaparte, As every child can tell, The House of Peers, throughout the war, Did nothing in particular, And did it very well.
In The Little Foxes, Leo acts this part, even though his family is really only Nouveau Riche.
The "music hall" (popular entertainment, mainly working-class, in the 18-1900s, a collection of songs and comic skits) is a rich mine of these characters: "Gilbert the Filbert", "the Knut with a 'K'", "Burlington Bertie" (the more famous ditto from Bow is a parody) and so on.
Schtolteheim Reinbach III. Like Snowe, he wants to help people. However, he at first simply asks daddy for help. However, he quickly realizes his father to be useless and leaves him, joining you in your quest. While a bit foppish and narcissistic, he is a truly good character and will fight with you, being skilled in sword fighting and magic.
And Suikoden V gives us Euram Barows, a textbook Upper-Class Twit who's become the heir after his older brother was tragically assassinated. No, he wasn't actually involved. And to be fair, he can get better... Technically he wasn't always like that. When his brother died he began acting like that to try and cheer up his mother.
In the Darkstalkers series Morrigan Aensland starts out like this causing her guardians constant worry. Its only after her adopted father dies, and she combines with Lilith that she becomes responsible..
Dynasty Warriors's Yuan Shao has one constant and defining character trait: his unerring belief that he's the best and most deserving to rule on account of his "noble" lineage (though not mentioned in the games' story, the preceding four generations of his family had served in at least one of the Han Empire's three highest posts), and declares everyone else outside of his army to be lowly peasants.
In the Pokémon series, the Rich Boy, Aristocrat, Gentlemen, and Lady Trainer Classes can fall into this. Also, the Kalos region in it's entirety
Dragon Age: Origins features King Cailan Theirin. Upon first introduction at Ostagar, he comes off as a rather likable sort, if incredibly naive. He's outwardly confident that the Fereldan forces gathered at Ostagar will be more than capable of stopping the blight then and there, due in no small part to the presence of the Grey Wardens. (Granted, it is implied in the Return to Ostagar DLC that this was a facade.) His father's long-time friend, Teyrn Loghain Mac Tir, regularly chastises him for it, as well. He also combines this with Prince Charmless in the game's lore, one particular snippet of which states that he was having difficulty producing an heir with Anora, so he was advised to attempt reproduce with other women, which also failed. One would think someone would realize that maybe it was his equipment that was failing.
The Continentals: In The Continental, both Evelynne Poole and her older brother Clifford are prime examples. Evelynne can be described as the Paris Hilton of 19th century England.
Subverted with It's Walky's Jason Chesterfield: he has the name, the nationality, the accent (explicitly, despite the comic being written), the costume (bowtie and dinner jacket, at all times), the rich relatives, the lack of a job when we first meet him, and is certainly an embarrassment to his family... and yet is also a competent agent and one of the only main characters whose record contains no severe mental incidents. He's also from a parallel universe where England produces ninjas ("Britjas"). Some slack must be cut.
Excel Hotel in Muertitos is yet another blatant Paris Hilton parody, right down to the name.
In the story "Heart of the Lion" from The Wulf Archives, an Upper-Class Twit by the name of Lord Heatham leads a White Empire company into the Veldt Lands expecting a "quick campaign" against the Sholanti. The expedition fails miserably, due in large part to Heatham's poor tactics and his arrogant underestimation of the people he wanted to conquer and enslave, and he and those of the company who actually make it to the battlefield are slaughtered to a man, with the protagonist being the only survivor.
Phase knows plenty of them in the Whateley Universe, because he's the Sheltered Aristocrat. He includes his older sister Heather in the category, and his cousin Paris (yes, that Paris). Tansy Walcutt would fall into this category too, but she got superpowers, and now she's busy being the Alpha Bitch.
Sam's parents in Danny Phantom seem to be this on the surface, a characteristic Sam herself vigorously averts.
Lemongrab of Adventure Time. He's an earl, the heir to the Candy Kingdom, and presumably wealthy... but he doesn't even know how to prepare a meal for himself, and has a history of having everything he needed handed to him.
Kim Possible villainess Camille Leon was a Paris Hilton Expy who turned to crime to finance her lifestyle when her parents cut her off. She also possessed Voluntary Shapeshifting powers due to an experimental cosmetic surgery procedure. Came complete with an expensive pet, a Sphinx cat named Debutante.
Gordon the Big Engine has become this from Season 8 onwards due to Flanderization. He's in the higher ranks of the Sodor Railway and granted, he was always rather arrogant, but his pride was taken Up to Eleven and he has gotten into scrapes in almost every episode he's been in. He is however, very intelligent, when his pride has been brought down a notch or three.
Between the childhood flashback of Applejack's brief stint in Manehattan in "The Cutie Mark Chronicles" and the portrayal of Canterlot society as a whole in episodes like "The Best Night Ever" and "Sweet and Elite" - all of which are filled to the brim with examples of this trope - Friendship is Magic is surprisingly harsh in its appraisal of high society for such an optimistic show (though the latter episode features a welcome subversion in the form of Fancy Pants).