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->'''Fern:''' It's true that the journey ahead may be safer with a priest. What do you not like about the idea, Ms. Frieren?\\
'''Frieren:''' Hm... It's an aversion to my own kind, I guess.
-->-- ''Manga/FrierenBeyondJourneysEnd'', discussing bringing a dour priest into the party

Two characters have a difficult relationship not because of their differences, but because of their similarities. This is most commonly seen between parents and children or romantic couples, but there's plenty of room for it in other relationships.

This can be a sign of self-loathing: the character hates himself, so he also hates people who remind him of himself. Or it can be a matter of certain traits needing to be complemented rather than mirrored in a relationship: someone who talks all the time and someone who would rather listen are obviously better off with each other than with partners like themselves. Still other times, the two might be able to get along well enough if it were not for one key ''difference'' between the two, but with that key difference, the similar personality factors come into play and escalate the conflict.

A particular, but also very popular example of this includes two characters who both have such [[AttentionWhore massive egos]] that they inevitably end up butting heads with one another, as a result of naturally perceiving the other as a threat to their own dominant, attention-seeking attitude. For those same reasons, they have nowhere near enough humility themselves to ever back down, requiring the OnlySaneMan to restrain them or calm things down.

For the InvertedTrope, see BirdsOfAFeather -- they're similar but they like each other for it -- and OppositesAttract -- they like each other because they're ''different''.

Very frequently a MirrorCharacter. See {{Foil}} for a list of examples of how differing personalities can be better together. Often overlaps with YouRemindMeOfX and YouAreWhatYouHate. Compare NotSoDifferentRemark, ShadowArchetype, HypocriticalHumor, TurnOutLikeHisFather, YourApprovalFillsMeWithShame, DoppelgangerDating, and IHatePastMe.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Manga/Brave10'': Rokuro and Nanakuma are a pair of {{Tsundere}} [[AlwaysIdenticalTwins identical twins]] with UndyingLoyalty to their respective masters, but that only fuels more [[CainAndAbel conflict]] between them.
* ''Manga/FrierenBeyondJourneysEnd'': Frieren and company are asked by a local village priest to bring his dour brother, Sein, with them on their journey, as he's spent a good portion of his life moping and being stuck in a depressive rut due to his decision not to follow his childhood friend on his own adventure. Fern and Stark are amenable to the idea, but Frieren has more mixed feelings about it due to this trope. She herself was stuck for nearly a thousand years waiting for the right moment to hunt demons and put her training to the test, but never finding it. Eventually, she decided that it was too late for her to do anything at all, before the hero Himmel came along and convinced her to join him. After one conversation with Sein a hundred years later, Frieren decides she doesn't like people like Sein (and by extension herself), and for that reason he must absolutely join their party.
* ''Manga/KaguyaSamaLoveIsWar'': One reason Iino and Ishigami don't get along is because both of them are forthright and critical. Without other people around to mediate them, they just get deadlocked in endless arguments. There's also the fact that neither tells the other how they keep each other from harm. Iino did her best to keep Ishigami from being expelled in middle school and shields him from the other public morals committee members, while Ishigami secretly (and sometimes openly) does his best to spare her from humiliation or keeps her away from suspicious people. However, since they both think true altruism doesn't need any recognition, neither of them knows and interprets each other's actions as being hostile.
* ''Literature/MariaWatchesOverUs'': Sei and Suguru are the same character in male and female version. They can barely tolerate each other.
* ''Anime/NeonGenesisEvangelion'':
** It's mentioned at some point that [[HotBlooded Asuka]] and [[DeterminedDefeatist Shinji]] are something like this, which comes across as somewhat humorous considering she's the poster-child for FieryRedhead and he's a neurotic ExtremeDoormat. However, later on it's revealed that they actually have ''very'' similar backgrounds -- both having the same [[SanitySlippage internal struggles]] and [[ParentalAbandonment abandonment issues]] -- and the main difference in is how they handle their problems.
** [[spoiler: This is also the case with Shinji and his father [[TroubledAbuser Gendo]]. Both are brooding, quiet introverts who struggle with forming interpersonal relationships, and have pretty much the exact same {{Fatal Flaw}}s, being an immense self-loathing caused by a subconscious belife that they don't deserve to be loved. In fact, this is the reason for Gendo's ParentalAbandonment, as he had no confidence in his ability to be a father, and thought that Shinji would be better off without him.]]
* ''Manga/TheQuintessentialQuintuplets'': Zigzagged with Nino and Itsuki, who have the most similarities between any of the sisters, namely being practical, realistic {{Tsundere}} who are nostalgic about the past. While this means that usually they're the two that get along with each other the best, one of these similarities is that they're also the two most stubborn and prideful of the quintuplets and the last two who accepted Fuutaro as their tutor, resulting in the two of them arguing with each other the most as well. [[spoiler:The entire Seven Goodbyes Arc is kicked off by a massive clash between the two, stems from Itsuki calling out Nino's unfair treatment and rash judgment towards Fuutaro and her treatment towards Miku. While they both dislike Fuutaro (granted, the man himself acts {{Jerkass}} towards them from time to time), Itsuki is more than willing to give him a chance and later learns more about him that ties of her personality being more like a peacekeeper who wants to maintain the harmony among her family, while Nino barely even gives him a second thought, immediately judges him as an interloper and does illegal lengths to keep him away from her sisters, and she has temperamental streak in her that causes her to instigate conflicts. The youngest quintuplet's comments through the arc imply that they've had similarly fierce arguments in the past.]]
* This is the crux of the romantic issues that Ranma Saotome and Akane Tendō ''personally'' bring to the table in ''Manga/RanmaOneHalf''. Both suffer from a unique blend of pride, stubbornness, personal insecurity, and a certain lack of trust; this leads to them constantly arguing over often minor issues, and this bickering can swiftly turn violent. In the later parts of the manga, it's also shown that a major problem facing them is that, despite their mutual attraction, each wants the other to be the ''first'' to admit their feelings, due to their insecurity about whether the other reciprocates their feelings.
* ''Anime/RebuildOfEvangelion'' decides to do this with Shinji and his father [[BigBad Gendo]]. Shinji is an introverted kid who doesn't deal well with social situations but tries his best anyway, even very nearly [[spoiler:ending the world to save Rei at the end of the second movie.]] Gendo manipulates everyone around him and his plans are to reunite himself with Yui by ending the world. He goes as far as to [[spoiler:engineer Rei's demise in the final movie so that Shinji can understand the pain he feels.]] This comes to a head [[spoiler:during the final battle when Shinji fights Gendo in the Minus Space, with both characters piloting Unit 1 and Unit 13 who look very similar to each other and whose [[MirrorMatch moves are evenly matched.]] After being thrown around enough, Shinji is forced to finally understand Gendo and realizes that Gendo's younger self is [[NotSoDifferentRemark very much like him.]]]]
[[/folder]]

[[folder:Comic Books]]
* In one ''[[ComicBook/ArchieComics Betty and Veronica]]'' story, the titular girls bumped into two cute guys in the mall, Jon and Benny, who were pretty much their {{Spear Counterpart}}s. By the end of the story, Betty and Veronica decided that they wouldn't make a good match because they have too much in common.
* Creator/ArtSpiegelman, the author/narrator of ''ComicBook/{{Maus}}'', mentions this off-hand to his fiancée, as he once had a girlfriend who was also Jewish and middle-class, but Art then mentions that because they were so similar that it was weird to get erotic with the girl.
* In the ''ComicBook/New52'' one of the reasons Franchise/{{Superman}} and ComicBook/WonderWoman can’t maintain their BattleCouple relationship, is simply because they have too much in common with each other.
* This (along with DependingOnTheWriter) is likely one of the reasons why [[Characters/MarvelComicsMagneto Magneto]] treats his only son ComicBook/{{Quicksilver}} so appallingly. His reasons for disliking Pietro, that he’s too “brash, arrogant, vain and foolish” all directly [[LikeFatherLikeSon apply]] to Mags himself, not helped by the fact Pietro looks nearly identical to him. Magneto can’t properly love or respect his son because looking at Quicksilver is looking like into a mirror and seeing himself and all his own inherit flaws reflected back at him.
* In the ''ComicBook/Thor2014'' series, ComicBook/LadySif suggests this is why she and Thor never worked as a couple.
-->'''Thor:''' You speak your mind with the same fury with which you cross swords. 'Tis why I've always loved you, my lady.\\
'''Sif:''' Aye, and 'tis why our love has always ended so badly. I fear we are too much alike, you and I.
* Hal Jordan and Batman both have a longstanding animosity towards each other. This may be due to both of them being very headstrong, prideful individuals to a fault, but while Hal is [[IndyPloy improvisational]] as befitting a [[ImaginationBasedSuperpower Green Lantern]], Batman relies just as much on [[CrazyPrepared planning ahead]] and [[BatmanGambit accounting for as many variables as possible]], with the two methods naturally butting heads and neither being willing to compromise or apologize.
[[/folder]]

[[folder:Comic Strips]]
* Taken to an extreme in ''ComicStrip/CalvinAndHobbes'' when Calvin completely clashes with his duplicate.
-->'''Hobbes:''' He's a duplicate of you, all right.\\
'''Calvin:''' What do you mean? This guy is a total jerk!
[[/folder]]

[[folder:Fan Works]]
* The ''Literature/HarryPotter'' fic ''[[https://archiveofourown.org/works/14506926 A Bitter Goodbye]]'' posits this to be the case between Godric Gryffindor and Salazar Slytherin. Both are stubborn, prideful, and unwilling to compromise on their beliefs.
* ''Fanfic/CatRa'':
** Just like the [[WesternAnimation/SheRaAndThePrincessesOfPower source material]], this is the main reason Shadow Weaver abused Catra. She states that pretty much everything about Catra's behavior and personality reminds her of herself, a fact neither is exactly fond of. However, she does go on to say that the one shared aspect that she is truly proud of Catra for is [[TheDeterminator their shared resilience in the face of adversity]], calling it her greatest trait.
** Catra realizes during a one-on-one conversation that Frosta reminds her of herself at that age. Frosta takes it as a compliment when told this, before Catra explains that this a bad thing, since the attitude she had at the time led to a lot of regrets. As such, she urges Frosta to not repeat the same mistakes she did growing up. The exchange causes Frosta to start treating Catra as a CoolBigSis, with the duo further bonding over a shared love of [[ThePrankster pranking]].
* In ''[[Fanfic/PokemonHarmonyAndChaos Pokémon: Equestrian Adventures]]'', Twilight gets along great with Timber because they are so similar and think the same way about a lot of things, but she realizes that the two of them are both ''too similar''. Spending time with him made her [[AesopAmnesia forget everything she learned traveling with Flash]] and revert to her old way of thinking. So she ultimately decides to stay with Flash instead of go traveling with Timber, because if she stayed with Timber she would never learn anything new and just become stagnant.
* In ''Fanfic/PrehistoricParkReimagined'', the past romantic relationship between Drew and Cynthia started out as a fairly loving case of OppositesAttract brought about by an instance of SingleWomanSeeksGoodMan, but ultimately derailed and headed irreconcilably south when it became clear how the incredibly headstrong and rebellious personality and hatred of being told no that they both shared ultimately brought out the worst in them via the naturally reckless and short attention spanned Drew proving resistant to Cynthia's efforts at reining in his more self destructive tendencies and bringing order to his chaotic lifestyle and the more cautious and orderly Cynthia taking umbrage to Drew's seeming refusal to abide by her attempts at 'helping' him improve his lifestyle.
* Among the reasons that [[Anime/PuellaMagiMadokaMagica Kyoko]] and Charlotte have trouble getting along in ''Fanfic/ResonanceDays'' is because both are brash and blunt and these traits do not rub off on the other well.
* In ''Fanfic/RWBYDuellingRoses'', this is why Yang isn't allowed to summon Red Dragon Archfiend: She resonates with all four of the aspects that the Monster Spirit represents (passion, pride, righteous fury and rage) to the point that she flew into a berserker rage the one time she summoned it without Taiyang's help.
* In ''[[https://archiveofourown.org/works/14215674 When the Day Met the Night]]'', this is why [[WesternAnimation/MiraculousLadybug Adrien]] has difficulty talking to Kagami, who also has AbusiveParents. When he looks into her eyes, he sees his own pain reflected back at him, and it's too much to bear.
[[/folder]]

[[folder:Films -- Animated]]
* In ''WesternAnimation/TheSuperMarioBrosMovie'', Mario and Donkey Kong have a lot more in common than the latter is willing to admit, as they are both incredibly headstrong and [[{{Determinator}} determined]] individuals who [[WellDoneSonGuy desperately want to earn their respective fathers' approval]]. This personality clash naturally fuels much of their antagonism, but the two eventually manage to form a FriendlyRivalry by the film's climax.
[[/folder]]

[[folder:Films -- Live-Action]]
* ''Film/AntMan1'': Hank Pym took in Darren Cross as a protégé because, in his own words, "I saw myself". When Cross asks why Hank then pushed him away, Hank answers "because I saw ''too much'' of myself."
* ''Film/AvengersInfinityWar'': Tony Stark and Stephen Strange share a strong mutual dislike of the other, primarily because they're both InsufferableGenius {{Deadpan Snarker}}s who are evenly matched in both capacities.
* ''Film/DoRevenge'': During [[spoiler:Max's]] MotiveRant when he confronts Drea and Eleanor in the climax of the film, it is revealed that this is the primary reason why he leaked the intimate video between him and Drea and angered her into breaking up with him. For the exact same ruthlessly selfish and sociopathic nature that he and Drea both shared caused him to view her as a threat to him, at which point he decided he needed to get her out of his life.
* ''Film/FightClub'': The narrator initially has a strong distaste for his eventual LoveInterest Marla due to the circumstances in which he meets her causing her to come across to him as an uncomfortable mirror of his own dishonest nature at the time.
* ''Film/MarriageStory'': One trait that Nicole and Charlie both identify as liking about the other is competitiveness. Guess what happens when two highly competitive individuals who are married to each other decide that they both want to "win" the divorce proceedings?
* ''Film/{{Nope}}'': OJ suggests that the reason his sister Emerald and their late father, Otis Sr., frequently butted heads is that they were too similar.
* In ''Film/RoadToPerdition'', Michael Sullivan, Jr., feels like TheUnfavorite and eventually asks his father straight out if he liked Michael's murdered brother better. His father says that he didn't, and that if he treated them differently, it was because Michael reminded him of himself, and he didn't want his own son to TurnOutLikeHisFather.
[[/folder]]

[[folder:Literature]]
* ''Literature/ChroniclesOfTheKencyrath'': One of the key reasons Jame makes Torisen so uneasy is that she reflects back at him all the parts of ''himself'' that is uncomfortable with and represses--his ShadowArchetype. And yet at the same time, he loves her, and loving those parts of ''her'' helps him come to terms with them in ''himself''.
* ''Literature/ConstanceVeritySavesTheWorld'': When Tia points out how much in common Connie and Larry are, Connie retorts that that is exactly why it would never work if they ever actually started dating for real. Not to mention his mother is one of her [[ArchEnemy Arch-Enemies]].
* ''Literature/GoblinSlayer'': High Elf Archer gets into an argument with the titular character because of their [[GoodVersusGood differing degrees of compassion]]: she wants to go after the big-picture enemies that are threats to ''everyone'', and [[SmallStepsHero he's]] only interested in eliminating his personal nemeses, who have caused a lot of trauma to individuals but are not nearly strong enough to threaten civilization. The story takes the view that [[BothSidesHaveAPoint both characters have valid perspectives and could stand to learn from each other]].
-->'''High Elf Archer:''' ''[distressed]'' Hordes of demons are going to attack! Do you realize that the world is at stake here?!\\
'''Goblin Slayer:''' Yes. But before the demons destroy the world, the goblins will destroy the villages.
* ''Literature/HarryPotter'':
** In ''Literature/HarryPotterAndTheOrderOfThePhoenix'', Harry and Cho's relationship is sunk by their emotional volatility. Cho is so sensitive that she cries frequently over [[spoiler:Cedric]]'s death a year ago; [[HotBlooded Harry]] can't understand why anyone would succumb to sadness when there's still fighting to be done.
** It's heavily implied in the saga that the ongoing animosity between the houses of Gryffindor and Slytherin stems from the fact that their members are similar to one another in more ways than the students of either house would like to admit. Both Gryffindors and Slytherins tend to be rather prideful and have strong drives to prove themselves, although they manifest them in different ways (Gryffindors tend to jump headfirst into challenges, while Slytherins are more cautious but also more ambitious).
* ''Literature/TheHungerGames'':
** Katniss and Gale. [[spoiler:In the line when Katniss resolutely picks her other suitor over Gale, she cites this reason:]]
--->[[spoiler:That what I need to survive is not Gale's fire, kindled with rage and hatred. I have plenty of fire myself. What I need is the dandelion in the spring. The bright yellow that means rebirth instead of destruction. The promise that life can go on, no matter how bad our losses. That it can be good again. And only Peeta can give me that.]]
** This is the reason Katniss and Haymitch have such a [[VitriolicBestBuds combative relationship]] -- Peeta observes that they're far too much alike.
* ''Literature/ImInLoveWithTheVillainess'': Rei strongly dislikes Prince Rod Bauer for being determined, assertive, and unrelenting in his pursuit of whatever or whomever he wants. She displays the exact same traits when chasing ''her'' love interest, Claire. Ironically, Rod eventually finds himself quite smitten with Rei, though she unquestioningly, unfailingly rejects his advances--part because she doesn't like him, part because she's firmly, [[IncompatibleOrientation 100% lesbian]].
* In ''Literature/TheIrregularAtMagicHighSchool'', the motorbike club and the robotics club have a ferocious rivalry that started when the former split from the latter. It doesn't help that there is only one garage on campus, so the bikers have to rent a less convenient place nearby.
* ''Literature/LittleWomen'':
** Jo and Laurie are one of the most famous examples of a potential romantic couple who are ultimately BetterAsFriends because of this trope. Although when Jo turns down his proposal she also points out the things that are too different about them (she wouldn't like high society, and he wouldn't like her writing). Laurie ends up marrying Amy, who is quite different than Jo, while Jo marries Friedrich Bhaer, who is very different than Laurie.
** Jo and Amy also have shades of this in their [[TheGloriousWarOfSisterlyRivalry Glorious War of Sisterly Rivalry]]. Despite being [[TomboyAndGirlyGirl extremely different]], they both have the liveliest, most forceful personalities of the four March sisters, and both have hot tempers, so they both generally get along better with their milder-mannered sisters Meg and Beth.
* ''Literature/MaloryTowers'': The reason why Gwendoline can't stand Maureen: being around her is like looking in a mirror in an uncomfortable way. Maureen has all of her flaws and Gwen sees her the way the other girls see her which is a horrifying experience for her.
* ''Literature/PercyJackson'': Percy and Thalia, as children of Poseidon and Zeus (respectively), two of the the most powerful gods amongst the Greco-Roman pantheon, are both incredibly powerful demigods who can easily cause some serious damage whenever they really decide to cut loose while also being incredibly determined and slow to give up as well as resistant to acting under any command apart from their own. This flares up when they are in the same line of command most of the time, but when they have their own chains they get along quite well.
-->'''Annabeth:''' You guys are so much alike it's scary. I mean, either you would've been best friends or you would've strangled each other.
* ''Literature/RedMarsTrilogy'': Maya and Frank are attracted to each other, but they're both such {{Manipulative Bastard}}s that it turns into a miserable time for both of them.
* A key element of the novel ''Literature/TheStoneAngel'' is that Hagar Shipley insists that her younger son John is just like her while his older brother [[TheUnfavourite Marvin]] is like their father. In reality, the opposite is true and Hagar is simply deceiving herself. The stodgy, proper Marvin is just like his mother which is probably why she dislikes him so much.
* ''Literature/TortallUniverse'': Alanna's relationship with Liam doesn't work out because they're such similar people: stubborn and temperamental warriors with ChronicHeroSyndrome who aren't willing to adjust for each other, or for anything. George (the man she marries) is a much more laid-back, humorous type.
* In ''Literature/TrappedInADatingSimTheWorldOfOtomeGamesIsToughForMobs'', this is the basis of the SitcomArchNemesis dynamic between the protagonist Leon, and King Roland Holfort. They are both jerks who do the right thing in the end, BrilliantButLazy, and both womanizers. At first Leon thought that the King hated him because he seduced The Queen and beat up his son, but Roland's stated motivation is Leon stealing his thunder during a crisis. The similarity between the two helps Roland feel confident that Leon won't kill him some day.
* ''Literature/ATreeGrowsInBrooklyn'': Of Katie's two children, her daughter Francie takes after her--striking Katie as ordinary--while her younger son Neeley takes after his father, who was a handsome and loving but unreliable alcoholic. Katie devotes herself to making sure Neeley grows up to be like the man she fell in love with, but without his flaws, leaving Francie to fend for herself. She tries to hide her ParentalFavoritism, but Francie understands her mother's motives instinctively.
* ''Literature/TheUnexploredSummonBloodSign'': It's lampshaded that the war between Kyousuke and the White Queen will not end until one of them kills the other or converts them to their way of thinking. They're so proud and so driven to excel that it can't end any other way--even though, when they're ''not'' fighting over [[SeriousBusiness philosophical differences]], they quite like each other.
* In ''Literature/YouDontOwnMe'', the affair between [[spoiler:Leigh Ann and Martin]] and subsequent fall-out is a dark example of the pairing of two ruthlessly ambitious, self-absorbed people with narcissistic tendencies. [[spoiler:Leigh Ann]] wasn't interested in a serious relationship with [[spoiler:Martin]] and definitely wasn't keen on standing in his shadow. [[spoiler:Martin]] wasn't willing to accept her refusal and tried to manipulate her into caving to his demands, [[spoiler:prompting Leigh Ann to respond [[ADeadlyAffair with violence]]]].
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/ThirtyRock'':
** Liz broke up with Carol for this reason, and later it was made explicit that she and Criss were a good fit because of their differences.
** There was an episode where Liz and Jenna had a fight and went looking for new best friends more like themselves, only to realize why they needed each other: Jenna is an AttentionWhore who can't be around other people who will compete for the spotlight, and Liz is so negative that having another negative person to bounce off is just "exhausting"; she needs someone so vacuous and self-absorbed that they'll just let her vent because they're not even listening. (This helps answer the oft-asked and oft-lampshaded question of [[WithFriendsLikeThese how these two were ever friends to begin with]].)
* ''Series/BabylonFive'': this was the reason for John Sheridan's divorce from his first wife, Elizabeth Lochley. They had a lot in common, including their commanding dominant personalities. They quickly realized that getting married was a mistake, and [[AmicableExes claimed the divorce saved their friendship]].
* ''Series/TheBorgias'': Rodrigo and Cesare's increasingly strained relationship is in no small part because they're so similar to each other--"all the fire and the fury, the drive, the pitiless ambition"--which makes Cesare bridle at his constantly being denied real power, and Rodrigo's guilt for what they do gets exacerbated when he sees his own traits in Cesare. At the end of Season 2, Rodrigo starts to explain to Cesare that Rodrigo favoured Cesare's idiot younger brother Juan because Juan didn't continuously remind Rodrigo of his own faults, but the conversation is interrupted by [[spoiler:Rodrigo being poisoned]]. The conversation finally gets finished at the end of Season 3 (after spending most of the intervening time undermining each other in various ways,) when Rodrigo blurts out to the man trying to reconcile them, "I look into his eyes, I see myself! Do you expect me to love ''that''!?"
* ''Series/{{Frasier}}'': The recurring gag with Frasier's SitcomArchNemesis, Cam Winston, was that Cam was almost exactly like Frasier (a hammy, upper middle class snob), just slightly more successful at it. It's also a problem between Frasier and his brother Niles, which fuels their [[SiblingRivalry rivalry]].
* ''Series/{{Friends}}'':
** Monica's boyfriend Pete in Season 3, like her, was a CompetitionFreak and ControlFreak. She eventually broke up with him because she couldn't deal with his stubborness. In the next episode, her easy-going friend Chandler implies he has feelings for her, laying the groundwork for them falling in love a season later. Their subsequent relationship and eventual marriage is a very happy one.
** Chandler with Kathy, his last girlfriend before Monica. They initially bond over their favourite tv shows and books and share a similar sense of humour. However, in hindsight they both struggle with communication in a relationship and have CommitmentIssues, which leads to their break up. The stable and level-headed Monica however, helps him overcome these problems rather than making them worse.
** Non-romantic example: When Rachel starts [[DoppelgangerDating dating Ross's doppelganger]], Ross is the only person (apart from Rachel) who doesn't notice the similarities. And he hates Russ.
--->'''Ross:''' And it takes him, what? ... like ... I dunno ... uh, hello? ... a ''week'' just to get out a sentence?\\
'''Chandler:''' [[DeadpanSnarker Annoying, isn't it?]]
* ''Series/{{House}}'': Dr. House gets rid of one of his candidates, Dr. Henry Dobson, because they think too much alike; the purpose of House's team is to challenge him and provide avenues of investigation he wouldn't have thought of alone. And as Dobson, who all around proves a good sport about the whole matter, swiftly points out upon it becoming clear that he's the one who has to be fired this time around, House 'doesn't need someone telling [him] what [he's] already thinking'.
* ''Series/HowIMetYourMother'': What sunk Barney and Robin’s first time in a relationship and what destroyed Barney and Quinn's engagement since they were so much alike they couldn't trust each other.
* ''Series/InterviewWithTheVampire2022'': Louis and Claudia are the close ones -- they look like blood kin, they share a telepathic bond, and Louis has a far greater parental role to her. But in personality, she's more like her maker Lestat -- namely they're both vicious in a way Louis almost never is. This is also the reason they butt heads frequently.
-->'''Louis''': In many ways, [Claudia and Lestat] were more like each other than they wanted to admit. They both sought out weakness. They reveled in the exploitation of it, and they romped with joy as I played audience to their joyless exchanges.
* ''Series/MotherlandFortSalem'': Raelle and Abigail. They often butt heads due to both of them being so stubborn.
* ''Series/RedDwarf'':
** The episode "[[Recap/RedDwarfSeasonIMe2 Me^2]]", in which Rimmer's self-loathing means that two copies of him end up unable to talk to each other, with one of them openly desiring the other's death.
** In "[[Recap/RedDwarfSeasonIIParallelUniverse Parallel Universe]]", Lister and Rimmer meet their female versions. Dave Lister thinks Deb Lister is gross for a girl, but they avert the trope as they actually get on very well. However, Arnold Rimmer is completely disgusted by Arlene Rimmer.
* On ''Series/{{Roseanne}}'', the reason Roseanne and Darlene had such a tumultuous relationship during Darlene's teenage years is because Darlene is [[DeadpanSnarker her mother's daughter]] to a T.
* ''Series/{{Seinfeld}}'': Jerry, being a narcissist, falls in love with a woman (played by Janeane Garofalo) who is exactly like him in every way. However, being a ''self-loathing'' narcissist, he gradually comes to realize that he can't be with her because he hates himself too much to put up with his own personality all the time. Of course, because they're so exactly alike, she comes to that exact same realization at the exact same time, and they have what Jerry believes may very well be the world's first truly mutual breakup.
* ''Series/StarTrekVoyager'': The Doctor gets a chance to meet his "father," the scientist who designed him. They clash immediately. [[Series/StarTrekTheNextGeneration Troi]], who had been trying to counsel them, eventually gets tired of their crap and exclaims that she expected them to be similar but different, "like two sides of the same coin," but now she realizes that they're exactly alike--they're both ''jerks!''
* ''Series/{{Supernatural}}'': While Sam's main issue with his father John is that he and Dean were basically raised as child soldiers, after a not-so-different moment Dean notes that this was probably a factor as well. And considering how Sam and John both have an incredibly stubborn streak and easily become obsessed with achieving revenge no matter what against supernatural beings and creatures that they [[ItsPersonal have personal grievances against]], Dean's claim certainly isn't without merit.
-->'''Dean:''' Y'know, I finally get why you and Dad butted heads so much. You two are practically the same person.
* Reno and Sam in the ''Series/TalesFromTheCrypt'' episode "Cutting Cards" are a lot more alike than either of them would be willing to admit. They're both TheGambler and TheGamblingAddict with too much pride to just call it a draw and see each other as TheRival that must be defeated in TheBet, wherein the loser must leave town for good so as to not meet the winner, no matter how much it costs each of them, after years of winning and losing to the other. This results in [[AnArmAndALeg both losing their own limbs]] in an AbsurdlyHighStakesGame -- and they're ''still'' trying to outdo the other at the end of the episode.
[[/folder]]

[[folder:Pro Wrestling]]
* In Osaka Pro, Gamma was basically an {{expy}} of Wrestling/{{WCW}}, Toryumon System and Wrestling/DragonGate wrestler CIMA. CIMA wasn't too thrilled when Gamma jumped over and it would take years of fighting before the two finally became friends.
* Wrestling/RingOfHonor {{tag team}} The All Night Express were incredibly similar to [[Wrestling/TheWorldsGreatestTagTeam Wrestling's Greatest Tag Team]], even taking up similar entrance attire to the latter when they showed up in the promotion. Kenny King and Rhett Titus were quintessential {{jerk jock}}s who had spent their ROH careers belittling and bully any 'vulnerable' members of the roster but were none to pleased to be on the receiving end from Charlie Haas and Wrestling/SheltonBenjamin.
[[/folder]]

[[folder:Tabletop Games]]
* In ''TabletopGame/DungeonsAndDragons''' ''TabletopGame/{{Greyhawk}}'' setting, Saint Cuthbert and Pholtus seem incredibly similar at first glance: they're both gods that sit right on the border of LawfulGood and LawfulNeutral, they both fill the GodOfOrder role and despise Chaos as a result, they both have a strong GoodIsNotNice streak, and they're both known for having a highly evangelical following. However, their relationship is consistently described as one of general dislike at best, seething rivalry at worst. This is largely because of two other shared traits: they're both very proud, and tend to think that anyone who doesn't agree with them is simply wrong. Because of this, whenever they deal with the few places where they do disagree with each other, they're mutually incapable of ever letting it go.
[[/folder]]

[[folder:Video Games]]
* Implied in ''VideoGame/DragonAgeInquisition''. The one time Dorian mentions his [[ArrangedMarriage betrothed]], he strongly indicates that the two of them dislike each other for this reason.
* In ''VideoGame/FireEmblemThreeHouses'', prince Dimitri and princess Edelgard are destined to fight each other [[InSpiteOfANail no matter what route you take]] because they're both charismatic idealists willing to resort to violence to build the world they want. He's for the status quo (to an extent), she is '''very much''' against it.
* In ''VideoGame/AHatInTime'', The Conductor and DJ Grooves are two filmmakers who share a similar backstory of being inspired by childhood movies to pursue filmmaking. Unfortunately this means that as adults they've become rivals when forced to share the same movie lot since both of them were egomaniacs.
* If (male) Shepard decides to break up with Miranda in ''VideoGame/MassEffect2'', he uses this exact phrase.
-->'''Shepard:''' This won't work, Miranda. We're too much alike.
* ''VideoGame/Persona2'': In the early game Tatsuya and Yukino cannot really do joint negotiations because according to their relationship description, they are "too alike". Considering Yukino is a tomboy and ex-delinquent, Tatsuya is currently a delinquent, and they're both rather cool-headed fire users, it's not all that wrong. Later on in the game Yukino takes a mentor role to Tatsuya.
* In ''VideoGame/TheSims3'', most traits you can give a Sim strengthen the relationship when encountered in another Sim, but the "snob" trait conflicts with itself. Snobby Sims prefer someone with the "easily impressed" or "schmoozer" trait, who will agree that the snobby sim is superior.
* In ''VideoGame/SixAges'', relations between Riders and Wheels are nearly always acrimonious because they have a shared heritage and religion they can disagree about. Foreigners' total disbelief in Elmal is bad, but it's still ''less'' insulting than the Wheels insisting that Elmal is a dogmatic, misogynist slave owner... because that's what their culture deems the ideal male. A Rider myth lampshades that it's often easier to make peace between strangers than a feuding family.
* In ''VideoGame/{{Tyranny}}'', Lantry, a TagalongChronicler whose WallOfBlather can cause hour-long timeskips and test [[PlayerCharacter the Fatebinder]]'s mental resolve, mentions he had issues with his mentor over this.
-->'''Lantry:''' Sage Chiasmus. Provost of the School back before the war. Vapid bloviator, insufferable pedant — needless to say, our similarities made us utterly incompatible.
[[/folder]]

[[folder:Visual Novels]]
* This is the reason why Rin and Luvia can't stand each other in ''VisualNovel/FateHollowAtaraxia''. It's implied that in addition to having similar personalities, they're also distantly related.
* In ''VisualNovel/FateStayNight'', the "Heaven's Feel" scenario has Shirou realize that he and [[spoiler:Kotomine]] are actually very alike in some regards, and his refusal to admit it was why he antagonized the man so often. It's because of this he knows he'll need to kill [[spoiler:Kotomine]], because their goals are mutually exclusive and, just like Shirou, [[spoiler:Kotomine]] will not stop pursuing his.
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/ElGoonishShive'', when Tedd plays Luke at [[TabletopGame/MagicTheGathering Magickal Cards,]] neither of them seem to notice that it's practically a MirrorMatch. They do, however, both think simultaneously, [[http://www.egscomics.com/index.php?id=1970 "This guy has a really annoying play style."]]
* Kaff Tagon in ''Webcomic/SchlockMercenary'' has ''just enough'' traits in common with his father Karl that they don't get along for most of the comic. The biggest rupture came when Karl couldn't ShootTheDog during a nanite attack, but expected Kaff to, despite neither being emotionally equipped for that.
* ''Webcomic/SluggyFreelance'': In "Oceans Unmoving", this is the core of the dynamic between [[KillerRabbit Bun-bun]] and his ArchEnemy [[ImplacableMan Captain Blacksoul.]] Both of them are unbeatably badass [[TheDeterminator Determinators]] who make everyone else do exactly as they want and don't have patience for much talk. And then they want different things, [[PoorCommunicationKills or at least think they do]]. In the same story's twist ending (so you have been warned), it's also revealed that [[spoiler:Blacksoul is ''also'' Bun-bun, from a different time, disguised inside a powerful flying robot dressed in robes. He knows he's in the Timeless Space for the second time but has amnesia about how he got out before, so he wants to follow his earlier self to find out. He can't just reveal himself since he knows he'd attack anyone trying that since he knows the real him would know that and not try it. He's really annoyed at his other self by the end.]]
* ''Webcomic/StandStillStaySilent'': Lalli, who has low-key cat-oriented DelusionsOfDoghood, tends to have a difficult relationship with ''actual'' cats.
[[/folder]]

[[folder:Web Videos]]
* In ''Franchise/{{Noob}}'', Omega Zell is a misogynist and Gaea a woman who doesn't like being demeaned. Gaea, on the other hand, [[ManipulativeBastard displays]] [[TheScrooge behaviors]] that Omega Zell tends to [[EveryoneHasStandards not approve of in general]]. Aside from this, the two don't get along simply from both being [[ItsAllAboutMe self-centered]], ambitious and taking every opportunity they can to bring their goal closer. The situation is such that if one of them has a opportunity to make a big step toward their objective, they (often correctly) assume that the other has the same idea in mind.
[[/folder]]

[[folder:Western Animation]]
* Alvin and Brittany in ''WesternAnimation/AlvinAndTheChipmunks''. When you have two {{Attention Whore}}s with big egos headbutting, getting along isn't on the list of priorities as much as besting each other is. Naturally, their dynamic is far more tense and combative compared to those that Alvin's brothers Simon and Theodore have with Brittany's sisters Jeanette and Eleanor (respectively).
* ''WesternAnimation/DinosaurTrain'': Buddy wants to make friends with Dennis at the Junior Conductors Academy, but keeps getting annoyed that Dennis answers most of the Conductor's questions first because they both know a lot about dinosaurs.
* Eddy and Kevin in ''WesternAnimation/EdEddNEddy'' have many similarities. They are both the leader of their respective group of friends. They have both called Jimmy "Fluffy", which nobody else has. And in the episode "Fa la la la Ed", where the kids decided to celebrate Christmas in July, they both felt that it was stupid at first, while nobody else objected to it. But they are pretty much sworn enemies, because they also have two more similarities: they both want to be the most popular kid in the Cul-de-Sac (even though Eddy has no chance of beating Kevin in that department), and they can both be [[{{Jerkass}} huge jerks]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': [[Characters/FriendshipIsMagicDiscord Discord]] and Trixie have a highly argumentative relationship due to their mutual massive egos and love of the spotlight.
* ''WesternAnimation/SheRaAndThePrincessesOfPower'' has [[Characters/SheRaAndThePrincessesOfPowerShadowWeaver Shadow Weaver]] give this as the reason she was [[AbusiveParents abusive towards Catra as a child]]. Both are highly ambitious individuals who resent those who are naturally gifted due to how hard they themselves had to work to get even a fraction of similar recognition. And since Shadow Weaver always had to struggle to get ahead in life, she figured it shouldn't be any different for [[Characters/SheRaAndThePrincessesOfPowerCatra Catra]]. Even if she wasn't fully sincere about this being at least one of the reasons she treated Catra so poorly, as she was intentionally playing on [[WellDoneSonGuy Catra's desperate need for affection]] as part of an escape plan at the time, the parallels are still there.
* ''WesternAnimation/TotalDrama'' has [[Characters/TotalDramaHeather Heather]], [[{{AlphaBitch}} the Queen Bee]], and [[Characters/TotalDramaCourtney Courtney]], [[{{AcademicAlphaBitch}} the Type A]]. They are both contestants who are very strategic and highly determined for winning the competition and the cash money prize, but often do not get along each other very well, especially as teammates, primarily because of both of their frequently selfish and harsh behaviors towards others.
[[/folder]]

[[folder:Real Life]]
* This trope is the main reason why {{Drag Queen}}s, despite being the vast majority being gay men, are split on the idea of dating each other ("kai-kai"). Some are okay with it, while others see it as endless HamToHamCombat and prefer to date quieter, more low-key men to balance out the craziness of their lives. This is precisely why Creator/{{RuPaul}} himself is married to a Wyoming cattle rancher.
* This was the relationship between Music/MichaelJackson and Music/{{Prince}}, who shared many similarities.[[note]](Both were Black men from the Midwest, born in 1958, raised in musical families, who grew up to be flamboyant, yet intensely private pop stars who defined the music of the 1980s, and both died early from accidental prescription drug overdoses.)[[/note]] [[https://manofmany.com/entertainment/music/prince-michael-jacksons-legendary-rivalry The feud]] was likely rooted in them being compared so often, Jackson reportedly viewed Prince's music as raunchy, while Prince, a musical version of an auteur, reportedly viewed Jackson as a pop star managed by committee. The two frequently traded snipes and were known to actively avoid each other. Mega-producer Music/QuincyJones even swears that Prince once tried to run over Jackson with his limo.
[[/folder]]
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