History Main / SingleMindedTwins

* Bill and Ben in ''WesternAnimation/ThomasTheTankEngine'' (and to a far lesser extent, Donald and Douglas, although they are more independent of each other).

* Although they're not confirmed to be siblings, the very similar-looking (and similarly-[[ThemeTwinNaming named]]) Frix and Frax in ''WesternAnimation/BuckyOHareAndTheToadWars'' are almost never seen apart. The only exceptions are:

* Souya and Shirase from ''Anime/MawaruPenguindrum''.

* In ''[[Comicbook/RobinSeries Robin Year One]]'', [[ComicBook/TwoFace Two-Face]] employs a pair of these, identical suits and finishing each other's sentences included. Given Two-Face's [[TwoFaced gimmick]] it's peculiar that he doesn't have them more often.

* Ami and Mami Futami initially start out as this in ''VideoGame/TheIdolmaster''. It's increasingly been subverted since ''VideoGame/TheIdolmaster2'' when Mami has grown her hair out and they no longer try to pretend to be the same person on stage. Though they still remain close and sing the same songs in console installments, they can be and have been produced separately while their individual traits become more pronounced.

** Franchise/FinalFantasy series in general averted this.

[[folder:Web Comics]]

%%* Pyun and Potaro from ''Anime/DaiMahouTouge''.

* In ''WesternAnimation/BatmanBeyondReturnOfTheJoker'', Dee-Dee/The Deeds/Delia & Deidre Dennis are twin sisters who may as well be two halves of one person. Besides looking and talking exactly the same (both twins are rapidly and amusingly voiced by Creator/MelissaJoanHart), they move and fight in incredibly effective teamwork. Just goes to show how devastating it would be if villains didn't [[MookChivalry attack the hero one at a time]]...

* In the UsefulNotes/NationalHockeyLeague, you have Daniel and Henrik Sedin of the Vancouver Canucks, who are known for being so in sync with each other that it's borderline supernatural. It became such commonplace to see them involved on each others' plays that Vancouver's local commentator has made a catchphrase out of "Henrik to Daniel... SCORES!"

* In ''Error of Soul'', another ''Franchise/HarryPotter'' FanFic, Fred and George are [[spoiler:continuously synchronised, so they're unable to remember who is who from day to day.]] The central concept of the plot is this gradually happening to *Harry and Hermione*, a situation that normally ends with the unfortunate soul-bonded pair trying to reach opposite sides of the planet.

* Robin and Kat Typer in ''Literature/TerraIgnota'' are both intentionally indistinguishable and archenemies. They have the same body language, same scars, and have burned off their fingerprints. Each continually watches through the other's tracker, so it's impossible to tell them apart by testing their memories. ''None'' of the characters can distinguish them. When Commissioner Papadelias asks their bash'mate Lesley which one he has in custody, she can only reply with "How in the world should I know?"

* ''Franchise/WonderWoman'': The Heyday triplets play with this trope. The three are identical, wear matching outfits and get a kick of pulling twin switches, but only Lillie and Millie really act as one, to the point of speaking in unison, having the same phobias and reacting the same way to things even when they're in separate rooms. Tillie is actually much more practical, sarcastic and down to earth than her sisters.

* An odd variation is taken in ''VideoGame/RuneFactory2''. Sera and Serina are twins who [[InformedAttribute you are told are very different]] because [[TomboyAndGirlyGirl one is "bookish", while the other is "sporty"]]. In actual fact, however, they are separated in only one quest, where one begs you to reunite her with the other, at that, and not only like doing the same things, but count as one person in your menu, and giving items to one counts as giving it to the other. As a second-generation romantic option, [[OT3 dating one means dating the other]], and they even complete (or simply repeat and enunciate upon) each other's sentences. Thanks to a probably-unintentional bug, they're even available as [[BiTheWay romantic interests]] to a female PC.

* Zorn and Thorn, from ''VideoGame/FinalFantasyIX''. They habitually repeat what the other says (i.e. "what the other says they habitually repeat"), and their boss reveals they aren't even really two beings just before they merge into a single two-headed EldritchHorror body for their final boss fight.

* Tío Oscar and Tío Felipe from ''WesternAnimation/{{Coco}}'' are never seen without each other or in non-matching outfits. Even their pictures on the Rivera family's ''ofrenda'' maintain the trend.

* In another rare use of the 'One person, Two bodies' ploy, Miss Level, a village witch first met in Terry Pratchett's ''Discworld/AHatFullOfSky'' (''Literature/{{Discworld}}''), was born with two bodies, and people assumed her to be a set of twins, "then they thought [she] was evil." She lives a very prosaic existence for someone with two bodies. She meets an unusual end: [[spoiler: when only one of her bodies is killed, she survives, though is weakened from the blow, and eventually finds that she still remembers how to use two bodies, and thus, being a witch, gains basically telekinetic abilities.]]

* Hip and Hop from the Western ''WesternAnimation/SuperMarioBros'' cartoons, based loosely on the Iggy and Lemmy (who had no such relation) from the games ''[[SuperMarioBros Super Mario Brothers 3]]'' and ''[[SuperMarioBros Super Mario World]]''. ''Mario'' fandom is fond of the cartoon personalities of all the Koopalings, however, and so [[PatchworkFic uses this trope but the games' names]].

* Averted in ''Series/StarTrekVoyager''. When the oft-mentioned but rarely-seen Delaney twins from Steller Cartography finally make an appearance, one of them is attracted to Harry Kim, much to his annoyance as Harry prefers her sister. When a nonplussed Tom Paris points out that it shouldn't make any difference, Harry proceeds to list a number of character differences between the two, ending with "that cute dimple on her right cheek." In their one appearance, while playing twin henchwomen of Dr. Chaotica in the [[ShowWithinAShow Captain Proton holonovel]], they act distinctly different, one more assertive than the other.

* [[HalfIdenticalTwins Phil and Lil]] from earlier seasons of [[https://tvtropes.org/pmwiki/pmwiki.php/WesternAnimation/Rugrats Rugrats]] were pretty much the same character, save for the occasional argument: Rambunctious, fun loving, and drawn to all things gross. In fact, the one time they ''tried'' to be different people, the episode ended with them deciding they were happier being like each other. Later writers decided to tone down Lil's tomboyishness and [[TomboyWithAGirlyStreak have her start referring to herself as "prettyful".]]

* Mei and Kyū (Para and Dox in the dub) in ''Anime/YuGiOh''. They had [[NoNameGiven NAMES?!]]

* In ErrorOfSoul, another ''Franchise/HarryPotter'' FanFic, Fred and George are [[spoiler:continuously synchronised, so they're unable to remember who is who from day to day.]] The central concept of the plot is this gradually happening to *Harry and Hermione*, a situation that normally ends with the unfortunate soul-bonded pair trying to reach opposite sides of the planet.

* Played with in ''ComicBook/TransformersMoreThanMeetsTheEye'' with the Duobots, Shock and Ore. Despite being physically distinctive (Shock was red and Ore was blue), most Autobots never bothered to learn which was which until Shock was killed by a Sparkeater and Ore was accidentally fused to the ship's quantum engine (which killed him for most of the series, but he was briefly brought back to life, still fused with the engine, somehow).