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Tropes that surround twins (and higher-order multiple births -- triplets, quadruplets, quintuplets, ''ad infinitum'').

!!Associated tropes:

* AllegedLookalikes\\
Two characters look ''awfully'' alike to the cast, but the audience doesn't believe they're any different than anybody else.
* AlwaysIdenticalTwins\\
When twins of the same sex are mentioned in fiction, they are almost always identical, not fraternal.
* AngstySurvivingTwin\\
One twin dies so the other can be angsty (and [[UniquenessValue more unique]]).
* BackupTwin\\
KilledOffForReal? A twin or clone shows up from nowhere to pick up where you left off.
* ConjoinedTwins\\
Conjoined twins are far more likely to appear in fiction than in {{real life}}.
* CoordinatedClothes\\
Twins--especially identical twins--in fiction will often wear identical (or stylistically similar) outfits to emphasize the twin factor.
* CreepyTwins\\
SingleMindedTwins, but with the creepiness factor played up.
* EvilTwin\\
Introducing...the evil(er) version of you!
** EvilBrunetteTwin
* FakeTwinGambit\\
Pretending to be one's own identical twin, whether such person exists or not.
* FearfulSymmetry\\
Identical combatants with identical attacks will cancel each other out.
* FinishingEachOthersSentences\\
Due to TwinTelepathy or TwinBanter, twins can carry on one side of a conversation no matter which one is speaking.
* HalfIdenticalTwins\\
Brother-sister (i.e., fraternal) twins act identical in all ways other than sex.
* IdenticalTwinIDTag\\
Twins make themselves distinguishable with hairstyles, costumes, or scars.
* ImpersonatingTheEvilTwin\\
A character is pretending to be his EvilTwin, usually badly.
* MakingUseOfTheTwin\\
If an actor has an identical twin, bring them into the cast!
* PlayingTheirOwnTwin\\
Twin or related characters are played by the same actor.
* PolarOppositeTwins\\
When the OddCouple happen to be twins.
* SameSexTriplets\\
A set of triplets is more often than not all identical and of the same sex.
* SeparatedAtBirth\\
Siblings (usually twins) get separated at birth and meet for the first time later in life.
* SiblingSenioritySquabble\\
Twins arguing over who has seniority due to being the oldest, even if it's a difference of minutes.
* SingleMindedTwins\\
They have identical appearance and personality and may as well be one person in two bodies.
* {{Synchronization}}\\
Twins share injuries or other metaphysical traits.
* TagTeamTwins\\
Twins used as a tag team duo in ProfessionalWrestling.
* ThemeTwinNaming\\
Twin names follow a theme: rhyme, alliteration, named after famous twins, etc. This is especially common with identical twins or at least twins of the same gender (boy-boy, girl-girl).
* TricksterTwins\\
A pair of twins who are up to no good.
* ThinkTwins\\
Two brains are [[TheSmartGuy smarter]] than one.
* {{Twincest}}\\
Twins getting it on with each other.
* TwinBanter\\
The snappy patter and unique speech patterns that twins form with each other.
* TwinDesynch\\
Twins start to look and act differently after they've been separated for a while.
* TwinSwitch\\
Twins swap roles with each other, such as with a TwoTimerDate. HilarityEnsues if they are PolarOppositeTwins.
* TwinTelepathy\\
Twins share a PsychicLink, from simple telepathy to full-on {{Synchronization}}.
* TwinThreesomeFantasy\\
What's [[AThreesomeIsHot hotter than a threesome]]? A threesome where two of them are twins!
* TwoSiblingsInOne\\
A twin absorbs the soul, LifeEnergy, or other metaphysical properties of their deceased sibling.
* UntoUsASonAndDaughterAreBorn\\
When twins are ''born'' in a series, and aren't just there from the start, they're almost always boy-girl fraternal twins.
* WeakerTwinSavesTheDay\\
Where one twin is weaker but ends up reluctantly saving the day when his stronger brother dies.