The outnumbered sibling often occurs when a character (usually the protagonist) is the only girl or boy in their (usually large) family. This can result in the character hoping and praying for a sibling of their gender, ParentalFavoritism either for or against the character, and the character feeling either superior or inferior to the rest. More often than not the outnumbered sibling will either be the oldest or the youngest.

Subtrope of MassiveNumberedSiblings. See also TheSmurfettePrinciple and IHaveBrothers. Often appears in a character's BackStory even if it isn't depicted in the plot.

''Highly'' expect AnnoyingYoungerSibling and/or BigBrotherBully to come into play and for creators to throw in a MissingMom (for a girl) or a DisappearedDad (for a boy) for added effect. Extreme cases may include a PromotionToParent as well.
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!!Examples

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[[folder: Anime and Manga ]]

* ''LightNovel/SisterPrincess''. An orphan named Wataru Minakami discovers that he has 13 sisters, one of whom is [[spoiler:TheMole, and not actually one of his sisters]].
* Quatre Raberba Winner of ''[[Anime/MobileSuitGundamWing Gundam Wing]]'' is the youngest child of his family and has ''twenty-nine sisters''. The catch is that [[spoiler:all of his sisters are [[DesignerBabies test-tubes babies]] due to difficulties with childbirth in space among early space colonists; Quatre was the only child born naturally, although [[DeathByChildbirth his mother died during childbirth]] and the fact that he wasn't artificially reproduced was kept secret from him.]] However, Quatre is shown to dearly love his sisters and it is [[spoiler:the near-death of his favorite older sister Iria (along with the death of his father) [[BewareTheNiceOnes which drives poor Quatre over the edge.]]]]
* ''IceRevolution'' Misaki became an extreme tomboy growing up as the only girl in a family of extremely macho martial artists. However, she does not come into conflict with any of them until she decides she wants to take up the "girly" sport of figure skating. Even then it serves more as backstory than a plot point.
* ''Manga/{{Maomarimo}}'': Mao has three older sisters: Sakuya, Kaguya, and Ako, his more outgoing elder twin. Ironically, he demonstrates more stereotypically feminine traits (particularly {{Dojikko}}, ShrinkingViolet, and FeminineWomenCanCook) than the three of them put together.
* ''Manga/CardCaptorSakura'' Syaoran has four older sisters. All of whom are obsessed with cute things. He does not seem thrilled about it.
* ''{{Otomen}}'': The author of [[ShowWithinAShow Lovetic]], believed by all readers to be a girl, is [[MoustacheDePlume a boy]] [[IHaveBrothers with several little sisters]]. [[MassiveNumberedSiblings Ten to be exact]].
* Alto Krauetta of ''Franchise/LyricalNanoha'', whose family comprised of three brothers. The lack of any female influence in her early life led to her thinking that she was a boy [[NoodleIncident until an incident involving the school toilet when she was seven]].
* Nagisa from ''Anime/{{Free}}'' has three older sisters who were very fond of [[DraggedIntoDrag dressing him up]] when he was younger.

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[[folder: Comic Books ]]

* Hope O'Dare from ''ComicBook/{{Starman}}'' has four brothers. She and her brothers are all cops and it's mentioned that she is the one everyone is frightened of.
* ''{{Princeless}}'': Devin has seven sisters.

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[[folder: Film -- Animated ]]

* Thumper from the film ''Disney/{{Bambi}}'' has five sisters, [[FridgeHorror which is reduced to four in the midquel]].
* PlayedWith in ''WesternAnimation/{{Brave}}:'' Princess Merida is the oldest child and the only daughter of the royal family, with three younger triplet brothers. However, the main conflict of the film seems to be that Merida herself is a {{Tomboy}} [[RebelliousPrincess being forced into a ladylike role]] by her mother.
* At the end of ''Disney/LadyAndTheTramp'' the title dog couple become the parents of three daughters (all Cocker Spaniels like their mother), and a fourth male puppy named {{Scamp}} (who is an indeterminate breed like his father).
** The exact same is true with [[{{Dogfaces}} Doppler]] and [[CatGirl Amelia's]] children from ''Disney/TreasurePlanet''.
* In the animated adaptation of ''HortonHearsAWho'', Jojo is the only son in a family with ''96 daughters''. No wonder he feels a little left-out.

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[[folder: Fan Works ]]

* In ''Fanfic/FrozenHearts'', [[spoiler:Hans not only had thirteen brothers]], but also a sibling of the opposite gender. [[WalkingSpoiler Said sibling's existence is something of a spoiler]], since the person in question is dead as of the start of the story.

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[[folder: Film - Live-Action ]]

* Roberta from ''NowAndThen'' had three older brothers and no sisters. The brothers are only briefly seen but it explains why she's such a tomboy.
* An ''[[Film/TheLittleRascals Our Gang]]'' short illustrates this trope with a hint of ValuesDissonance. Mickey is picked on by his two sisters and hopes that the baby his mother is pregnant with is a boy. Somebody tells him that [[UrbanLegend every fourth child in the world is born Chinese.]] He's upset by the idea of having a Chinese younger brother but eventually comes to accept it. Unfortunately from his point of view, his mother gives birth to another girl.
* Adam Sandler's character in ''PunchDrunkLove''.

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[[folder: Literature ]]

* Ginny Weasley of the ''Literature/HarryPotter'' series takes this to a bit of an extreme. Not only is she the only girl in a family of seven children, she's also the first girl born to the Weasley family in several generations.
* Mark in Creator/EdwardEager's ''Half-Magic'' and ''Magic by the Lake''. He is the only boy in a family of four children and his frustration with this is occasionally a plot point.
* In the Literature/VorkosiganSaga, Ekaterin has several older brothers and no sisters, and this is mentioned as being common among Barrayarans of her generation as the result of newly-obtainable sex-selection technology. In contrast to all the tomboyish examples of this trope, she specifically mentions this as being part of the reason why she's a ShrinkingViolet. Ekaterin later deliberately averts this in her own marriage to Miles with two sets of twins followed by one girl to balance her eldest son Nikki Vorsoisson.
** In an earlier example, Drou Koudelka was the only girl in her family with several older brothers and a MissingMom. She's as close to a {{Tomboy}} as Barrayaran society allows. This leads her to become a planetary martial arts champion and eventually the personal bodyguard bodyguard/nanny to the child emperor Gregor.
* In ''Literature/TheBible'', Jacob has twelve sons - and one daughter, Dinah.
** Though in some Jewish sources each of the sons, and Dinah, came with a twin sister.
** Also, in the Bible, the names of daughters are rarely mentioned.
* Flopsy, Mopsy, Cottontail, and PeterRabbit.
* In the ''{{Malloreon}}'', Belgarion and his wife are long-lived, and it has been prophesied that he would only have one son.
* Jenna Heap from ''Literature/SeptimusHeap'' is the only girl in a family with seven boys, and the youngest child as well.
* Posy from ''Literature/TheHungerGames'' has three older brothers.
* Jesse in ''BridgeToTerabithia'' feels alienated due to having four sisters, no brothers, and a disapproving father.
* Suze Simon from ''Literature/TheMediator'' goes from an only child to having three step-brothers when her mother remarries.
* ''Literature/ASongOfIceAndFire'':
** Margaery Tyrell is the youngest child and the only girl, having three older brothers. Despite that, she plays the part of a PrincessClassic perfectly.
** Lyanna Stark grew up with two older brothers and one younger one, and was a HotBlooded PassionateSportsGirl to match.
** Sansa Stark has two older brothers, two younger brothers, and a younger sister, but feels alienated all the same because Arya is extremely tomboyish. Emphasized when her narration mentions she'd always wanted a sister like Margaery.
* Isabelle Lightwood from ''Literature/TheMortalInstruments'' grew up with two brothers and Jace.

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[[folder: Live-Action TV ]]

* Tends to be mentioned as the background of tough female cops, such as Jane Penhaligan from ''{{Cracker}}'' and Kate Todd from ''Series/{{NCIS}}''. The idea being that their reason for seeking to compete in an all-male world is from attitudes gained in their childhood.
* Another "tough female cop" example is Jo Lupo from ''{{Eureka}}''.
* Yet another is Teresa Lisbon from ''Series/TheMentalist'', although she mentions a few times that she practically raised them after their mother died, so the existence of traditional sibling rivalry is questionable.
* In the ''{{Dollhouse}}'' episode "The Target", Echo's persona is implied to have this in her fake backstory; when Boyd asks her if she knows how to use a gun, she replies with, "Four brothers, none of them Democrats."
* Joey from ''Series/{{Friends}}'' has seven sisters and he's the only male.
* Theo from ''TheCosbyShow'' was the only boy in a family of five kids. Despite dealing with usual sibling stuff like a shortage of bathroom time, he seemed relatively okay with it.
* This is the basic premise behind the shortlived sitcom ''Odd Man Out'': a teenage boy has three older sisters and no brothers.
* Daphne from ''{{Frasier}}'' has... what is it? Six brothers? She talks about them a lot.
* The family in ''JustTheTenOfUs'' consists of six daughters and only two sons. And one of the boys is a toddler.
* ''Series/LandOfTheLost1991'': The Sorceress had several brothers. When Annie asked her how she survived, she said she turned them into toads. Annie entertained the thought of doing it to Kevin.
* Wyatt from ''Series/CrashAndBernstein'' was this to his 3 sisters, until he created Crash, and Crash came to life.
* Lindsay Bluth from ''Series/ArrestedDevelopment'' is the only daughter out of 4 siblings. [[spoiler: She's adopted, though.]]

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[[folder: Music ]]

* Bill from ''TheWho'' song "I'm a Boy" is saddled with three sisters and a mother who acts as if he was a girl as well.

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[[folder: Theatre ]]

* ''TitusAndronicus'' had 25 sons and one daughter. 'Had' is an important word here: as the play starts he has only five children left, and the number is falling fast.

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[[folder: Video Games ]]

* Wendy O. Koopa is the only girl of the [[QuirkyMinibossSquad Koopalings]] in the ''SuperMarioBros'' games.
* In the ''VideoGame/{{Warcraft}}'' universe, the three Windrunner sisters have a brother named Lirath who died in the Second War.
* On a slightly lesser scale, a female Dwarf Noble in ''VideoGame/DragonAgeOrigins'' has an older brother and a younger brother.

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[[folder: Web Comics ]]

* Jyrras from ''Webcomic/DanAndMabsFurryAdventures'' has six older (and much larger) sisters who tend to treat him as a living doll. In his words, "Hell is full of estrogen."
* Summer Winters from ''Moon Over June'' traces her [[DoesNotLikeMen misandry]] to growing up with three older brothers and three younger brothers.
* Surama from ''WebComic/{{Wurr}}'' has four brothers and no sisters, and three of them are older than her.
* Jinx from ''Webcomic/TheWhiteboard'' has eight sisters.

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[[folder: Western Animation ]]

* It's not "massive" but on ''WesternAnimation/TheSimpsons'' Bart occasionally has pangs of this, as the a boy with two sisters and no brothers. One time he went to an orphanage and got himself an orphan to be a brother. At first, he attempted to trick his parents into making a fourth child but he gave up when Marge told him there was a 50[=/=]50 chance the fourth child would be a girl. The idea of going shopping with three sisters scared him. In the end, the orphan was adopted by a couple with several daughters who're likely to make him understand what [[Manga/CardcaptorSakura Syaoran feels]].
* In ''TheSmurfs'' Papa Smurf has 100 sons but just one daughter, Smurfette. Later, the Smurfs create another sister called Sassette.
* Lor from ''TheWeekenders'' has so many brothers that she loses count of how many there actually are.
* Wendy from ''WesternAnimation/GravityFalls'' is the oldest and the only girl in a family of four children.
* Odd Della Robbia from CodeLyoko has five older sisters [[BigBrotherBully who like to pick on him]].
* Shego from KimPossible has [[spoiler: four brothers, who all have super powers as well. The five of them form Team Go, but Shego eventually quit, partly due to finding the dark side more enticing, but mostly due to getting fed up with her brothers.]]
* In ''DrawnTogether'', one Asian child laborer complains that Spanky's use of Ling-Ling in making shoes is making it hard for him to feed his 48 brothers and one sister.
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