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People procreate. Some do it a lot. Some really want to do it before time runs out. Some don't want to do it at all.

Yet, in fiction, people only procreate if it's relevant to the plot, and that includes Backstory. Most fictional characters do not have canonical relatives at all, and far fewer have siblings unless they are required by the plot. Authors employ this trope for every reason between heightening the angst of Parental Abandonment and excusing romance Genre Blindness.

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This is even more true in adoptive families. Fictional characters rarely adopt more than one child, happily or otherwise, unless the plot calls for it. Families with both adopted and biological children are even rarer.

In a World of No Grandparents, all parents are also usually only children, which means no one can raise orphans except butlers, strangers, or the school of hard knocks. Usually, the orphan in question is also an only child.

In shojo romances, the Plucky Girl heroine has seemingly avoided all interaction with the opposite sex until meeting the Troubled, but Cute school bully. In most cases, Plucky Girl doesn't have any brothers. If she does, they are too young to provide any model of what she is dealing with, or old enough to either be in the parenting role or live far away.

The Chosen Ones, Last of Their Kind and other such fulfillers of ancient prophecies not only suffer from Only Child Syndrome, their entire heritage suffers from it. When a man curses a family's name or goes after descendants for revenge, don't be surprised if 100, 200, 1000 years later, there is only one descendant. All generations previous must have felt bad for the eventual fate of The Hero and only had one child each to make the revenge short. Presumably in a more realistic story, if being the descendant of some ancient ruler means that one has a right to the throne, for every Farm Boy who becomes king, there are 373 cousins who Missed the Call. One wonders how they feel about this.

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Most examples of Parental Abandonment in a World of No Grandparents also feature Only Child Syndrome. Oh, the Wangst.

Expect some people with Only Child Syndrome to have a few subtleties. Such as, for example, most people who can point out Only Child Syndrome in Real Life can say an only child is often used to never having to compete with anyone else for parental attention, or feeling like they're the only person against the world. Or even a subtle disrespect or having never truly learned to live or communicate (in the worst cases) with others their age. This is in spite of the fact that it has been repeatedly shown in scientific studies that there is not a measurable difference in the personalities of only children as compared to siblings (at least not most of the time - there're a lot of perfectionists in the only child world). Sometimes this also happens with Middle Child Syndrome, too. Only children also tend to mature faster.

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Some stories use Harem Genre situations to replace the character's lack of a family.

This trope tends to affect fanfics in two ways: writers may convert a sibling-like bond onto unrelated characters, or create Original Character siblings.

Contrast Middle Child Syndrome, Massive Numbered Siblings. May result in Siblings Wanted.


Examples:

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    Anime & Manga 
  • In the first season of Bakugan, the only main character who is definitely not an only child is Julie, who has an older sister. The other brawlers don't seem to have any siblings. The second season introduces Mira, whose older brother Keith is actually Spectra, and Baron, who has several younger siblings, but we don't know anything about Ace's family. In season 3 there's Fabia, whose older sister is the queen of the planet Neathia. In total, there are 12 main characters in 3 seasons and only 4 of them are confirmed to have siblings.
  • Averted in Black Jack. You would think that an Anti-Hero Doctor with notable Parental Abandonment issues would be an only child, right? Well... no, actually. He has a half-sister from his father's second marriage. They just don't keep in touch because she doesn't like him very much.
  • Miaka and almost all the Suzaku Seven in Fushigi Yuugi have siblings, while Yui and the Seiryuu Seven (sans Amiboshi and Suboshi) were only children (we're not exactly sure about Tomo, Miboshi and Ashitare, though). However, the Suzaku Seven's siblings were either dead, killed off halfway through the story, or unimportant and thus were never mentioned. Miaka's older brother Keisuke had a minor role in the manga but played a more important role in the anime.
  • Lampshaded in Horimiya when Hori points out how weird it is that most members of the cast are only children (only four recurring characters actually have siblings, and one of said siblings is dead).
  • Justified in JoJo's Bizarre Adventure - Joestars, whether by blood or by marriage, have a really unfortunate tendency to die before having more than one child. Even when they aren't killed, something gets in the way (Jotaro's father is a famous musician who's always on tour - and when we say "always", we mean "he never appears in the series"). Averted with Joseph Joestar, who had a legitimate child (Holly, Jotaro's mother)... and then had an affair with a Japanese college student that resulted in Josuke. His wife was pissed when she found out.
  • Averted in Kaguya-sama: Love Is War. All but one of the student council members (Miko) have at least one sibling. This even extends to the supporting cast, where only Osarai and Hayasaka are confirmed to be only children. And even those three are justified since Miko and Hayasaka's parents constantly being busy with work ties into their backstories, while Osaragi's father is dead according to the official fanbook.
  • Averted in Lyrical Nanoha. Given how strong a theme family is throughout the franchise, most characters have at least one sibling (adopted or otherwise), even if those siblings have nothing to do with the plot or are only mentioned in supplementary material. The ones who don't are justified by either being orphans or Artificial Humans who were never officially adopted.
    • Just to put in perspective how prevalent this is: the second StrikerS Sound Stage has a scene were two minor characters are talking about their families. Both of them mention having multiple siblings, none of who are ever seen or even mentioned outside of this one conversation.
  • This seems to be the case in Mahou Sensei Negima!. Of the class of 3-A, only four characters have a confirmed sibling - the Narutaki twins (each other), Makie (younger brother), and Zazie (twin sister). Ayaka would have had one, but he died at birth, and Natsumi has to pretend Kotaro is her little brother, but she doesn't see him this way. Negi has Nekane, though it is revealed she is actually his cousin. This does imply Nagi had one though, most likely an elder brother.
  • Every mermaid in Mermaid Melody Pichi Pichi Pitch is either an only child, or they're all sisters. Because most of the other races are off doing their own thing and mermaids have a thing about not revealing their identity to humans, the only way that most of them reproduce is by having their pearl create a new mermaid when they die. Caren and Noel refer to themselves as twins despite never even having met before the story starts just because they were born two minutes apart, and some of the songs refer to Aqua Regina as a symbolic "mother", but the Fridge Logic says they must all be only children.
  • In My Bride is a Mermaid, Class 2-1 has 8 cast members in it (Nagasumi, Sun, Mawari, Saru, Lunar, Class President, Kai, Akeno). Of them only Saru and Akeno have any siblings (just one each) and four are explicitly only children.
  • Naruto:
    • Of the 12 Konoha genin, only Kiba, Sasuke, and Hinata have any siblings, and then it's only one (an older sister, an older brother, and a younger sister respectively), while Gaara, Kankuro, and Temari are all siblings. A strange occurrence, considering that their clans are supposed to produce new soldiers to defend their entire nation. Of course, we know nothing about the family life of many of them, and there is a high number of dead parents so it's likely a lot of them didn't even have the chance to have many kids.
    • This even persists into the next generation in Boruto, this time without the dead parents excuse. Of all the members of Naruto's generation, only Naruto and Hinata have two kids, with every other couple having only one. Shikamaru stated in Part 1 that he wanted a son and a daughter when he grew up, however he only ended up having a son with Temari.
  • In One Piece, the only major characters with biological siblings are Boa Hancock (two younger sisters) and Sanji (who left behind a whole Sibling Team when he ran away as a child). Nami and her sister were adopted orphans, Luffy's brother turns out to have been adopted, and the rest of the Straw Hats are known or assumed to be only children. There are a few minor siblings like the Nyaban Brothers, the Decalvan brothers, Hotori and Kotori etc. The series does much to say that it's not necessarily your blood that makes you family, though.
  • Most lead Pretty Cures from the franchise are only children, with the exception of Nagisa and Saki. However, Tsubomi gets a newborn sister in the final episode and Love and Setsuna become adopted sisters after the first half of the season. Hibiki is actually the only lead Cure who suffers from being an only child while Miyuki, Mana and Megumi don't seem to care.
  • In Pokémon Adventures, there is a rotating cast of 21+ main characters, yet only one is confirmed to have a sibling: Green and his older sister Daisy, and she's most likely only there because she exists in the games. That said, in Pokemon Emerald the rival has a younger brother, however Sapphire never got one most likely due to it being odd if a previously unknown sibling popped up. Platinum should also have a younger sister, but it's explicitly stated almost immediately that she's an only child.
  • The Sailor Soldiers of Sailor Moon. Usagi has an Annoying Younger Sibling... and that's it, she's the only one with any siblings whatsoever. Also, it's flat-out stated at the end of the series that Neo Queen Serenity only ever has one child in the future (Chibi Moon).
  • In Strawberry Marshmallow, Matsuri and Miu are the only ones who are explicitly only children; Nobue and Chika are, of course, sisters, and Ana... well, who knows? In episode 16, Nobue mentions this in connection with Matsuri's parents knowing to get her the new Harry Potter book. In episode 22, Nobue reflects on why Miu often feels left out.

    Comic Books 
  • One thing Archie Comics often got criticized for was that despite the attempt at depicting a "typical teenage" group of friends, an unrealistically high proportion of them were only children. Archie, Reggie, Veronica, and even minor characters like Chuck, Nancy, Moose, Midge and Dilton are all only children. Betty is actually the youngest of three children, but only the most hardcore of fans know that; her sister Polly makes single-digit appearances per decade, and her brother Chic is almost never mentioned even when Polly is. For all storytelling purposes, Betty may as well be an only child. And Jughead gained a baby sister fifty years after his debut, and it's a coin-toss whether most writers remember Jellybean's existence nowadays. The only significant siblings in the Archie cast are the twins Jason and Cheryl Blossom, who are about as far from role models as you can get.
  • DC Comics:
    • Batman and all of his protégés except for Barbara fall under this trope, though since he's adopted most of the Robins and Cassandra, they consider themselves siblings (for better or worse). There's also Batman's older brother, Thomas Wayne Jr., who's existed in various alternate continuities (and possibly in the New 52 as well). Also, for a while he actually thought Bane was his half-brother, but that didn't pan out in the end.
    • Green Arrow and all of his protégés...until his DC Rebirth series, where a long-lost half-sister showed up.
    • Superman is doubly so - he was the only child of the Jor-Els (though granted, they might have had more if it weren't for the slight impediment of being dead), and he's the only child of his adopted parents. Understandably justified as his birth parents died along with his entire planet when he was a baby, and the Kents couldn't have kids of their own.
    • Wonder Woman:
      • Diana's birth / creation into a league of immortals doesn't raise as many eyebrows as to why few children are born. Since they don't die, if they had new children showing up as often as humans do, their home island would be standing room only after a few centuries.
      • Granted, Pre-Crisis Diana had a black twin sister. No, really.
      • Diana usually treats Donna Troy as her younger sister—whether they're actually related is...debatable. Various explanations include her being a sort of magical clone of Diana or being a normal Muggle girl adopted by Hippolyta and given superpowers after Diana had already left the island.
      • As of 2017, Wonder Woman (Rebirth) is apparently introducing Diana's long-lost brother.
  • An unusual number in Marvel Comics:
    • Steve Rogers (Captain America) was an only child. The Paradise-X storyline shows he just wasn't aware of an older sibling...
      • As was his archnemesis, the Red Skull (probably due to his mother dying in childbirth and his father killing himself immediately afterwards). Red Skull's daughter Sin is also an only child.
    • Matt Murdock (Daredevil) is an only child.
    • Averted by the Fantastic Four; Reed Richards is the only member to be an only child. Jonny and Sue are siblings and Ben had an older brother who died when they were teens. Reed and Sue also have two children.
    • Bruce Banner (Incredible Hulk) is an only child, as is his cousin Jennifer Walters (She-Hulk), his wife Betty Ross (Red She-Hulk), and his father-in-law Thunderbolt Ross (Red Hulk).
    • Tony Stark (Iron Man) is an only child except for the brother he never knew about.
    • All the original Runaways are only children, but this is justified because each set of parents agreed to give their designated place in paradise to their offspring. Because there were only six places, the six couples had one child apiece. Victor is an only child for obvious reasons. The same can't be said for Xavin and Klara, but then again, it's never been explicitly stated that they didn't have siblings back on Tarnax VII or in 1907.
    • Peter Parker (Spider-Man) is an only child. In this case, his parents died a short while after he was born, so they didn't even have the chance to have another kid.
    • Notably averted with the Guthries. All twelve of them.
    • Young Avengers: Kate has an older sister, and it's implied that Eli comes from a large family. Billy and Tommy are twin brothers...via reincarnation (it's complicated). Billy mentioned he had two little brothers in the first arc, but over a decade later they've failed to appear in any capacity whatsoever. Teddy is an only child, which isn't too surprising given his parents were on opposite sides of an interstellar war. Same goes for Cassie, as her parents have split up and her father was dead for a while.

    Fanfiction 
  • The plot of Another Fairly Oddbaby is Poof feeling rather lonely as an only child, so he wishes to have a baby brother. Fortunately, Cosmo is willing to give birth to another child, who his parents name Puff. Unfortunately for Poof, not only does the baby turn out to be a girl, but she also turns out to be more mature than he is, meaning that they don't share the same interests. Fortunately, much like their parents, they ultimately learn to love each other despite their differences.
    • Not long after in the fanfic, Anti-Cosmo and Anti-Wanda give birth to Puff's anti-fairy counterpart, Huff. However, unlike Poof, Foop is horrified to learn that he has a younger sibling, as he actually enjoyed being an only child since he got all his parents' love and attention. Since they're both the opposites of Cosmo and Wanda's children, their relationship as the Foolish Sibling, Responsible Sibling is reversed, similar to Anti-Cosmo and Anti-Wanda's relationship compared to their fairy counterparts.
  • In Empath: The Luckiest Smurf, Papa Smurf reveals to Empath that he is Papa Smurf's only begotten son. However, Empath's mother did have another child through another father, which turned out to be Brainy, giving Empath a half-brother.
  • In My Huntsman Academia, Izuku is an only child, which leads to some awkward interactions with Weiss and Shouto when he starts making assumptions about what it's like to have siblings.

    Film — Animated 
  • Almost all of the Disney Princesses are only children. However, in the original poem The Ballad of Hua Mulan, Mulan has a younger sister, an older sister and a little brother (which is who they named the dog after in the movie) who is not old enough to join the army, but old enough to kill pigs by the time she comes home. Also, the real Pocahontas probably had many brothers and sisters as Powhatan had quite a few wives. Belle is given an unwanted suitor instead of the two jealous sisters from the original tale. Cinderella still has her mean stepsisters, though. Early drafts of Moana made her the youngest and the only daughter in a family with several sons, with a stronger "girls can do anything" theme; this was dropped in favour of focusing on a "follow your heart" message, with Moana an only child expected to become chief of her tribe. Rapunzel is justified by the fact that her mother's pregnancy almost killed them both. The exceptions are Ariel, who has six older sisters, Merida, who has three younger brothers (triplets), and Anna and Elsa.
  • Riley in Inside Out is an only child, despite her parents seeming like the type of people who would want a larger family.
  • It's glaringly noticeable in The Lion King that lion cubs are born as individuals when in real life litters are the norm. Even Timon, a meerkat, is presented as an only child in The Lion King 1½. Kiara was originally written as being a pair of twins but they scrapped the brother in development. Over a decade later she finally got a younger sibling in Kion from The Lion Guard though. Nala was also supposed to have a brother named Mheetu, but he was likewise cut. On the other hand, Mufasa and Scar are brothers so avert this.
  • Meet the Robinsons has Wilbur living in a large, extended family that includes aunts and uncles, great-aunts and great-uncles, cousins once removed and two people whose relationship nobody's even sure of...but no siblings, first cousins or other children. (Though, for that matter, no one else in his parents' generation seems to be married.) His parents almost adopt Lewis as a second child, before realizing he's actually Wilbur's own father from the past.

    Film — Live-Action 
  • Catch Me If You Can portrays Frank Abagnale, Jr. as an only child. In Real Life, he had three siblings.
    • A background event later in the film hints that his mother has had another child, although it's not made clear if it's his half-sibling or step sibling.
  • Almost all of the major characters in Harry Potter, including the title character and protagonist himself, are only children.
  • Noah and Allie from The Notebook are both only children.
  • Bootstrap Bill only had one kid in Will Turner, something that makes the plot of Pirates of the Caribbean: The Curse of the Black Pearl.
  • From book to the first movie of The Sisterhood of the Traveling Pants they removed one of Tibby's younger sibling so that she only has one, Bridget's brother so that she's an only child and Lena's sister so that she can go to Greece by herself. Lena's sister who we see in the second movie must have been jealous.
  • Star Wars: Anakin in The Phantom Menace is his mother's only child, although by the time of Attack of the Clones his mom has married, giving him a stepbrother.
  • Bella Swan, the protagonist from Twilight, is an only child. Although Edward Cullen has adoptive siblings, Edward is biologically an only child as well.
  • Thor is the only main hero in the Marvel Cinematic Universe who has siblings.

    Literature 
  • Animorphs:
    • Jake has Tom, Rachel has two younger sisters and Ax has Elfangor. The other three protagonists, over half of the humans, are only children. The same is true of Melissa Chapman and David, the only other kid characters to get significant development.
    • Ironically, most of the important Andalites (Elfangor/Ax, Aldrea and Alloran) have siblings, despite a throwaway line implying that their species has some sort of legalized population control.
  • In the Belgariad, Riva Iron-Grip's family has a tendency to produce only children, due to divine intervention. Garion, at least, is only alone because his parents were killed when he was an infant. (It's implied at the end of the Malloreon that he'll break the tendency - by having one son and legions of daughters. After all, the Prophecy stated the Rivan King would have only one son. It said nothing of daughters...) Belgarath the Sorcerer lampshades this.
    • In Polgara the Sorceress, it's stated several times that the line of hidden kings on occasion had multiple children (but not necessarily multiple males). Polgara presumably was only concerned with the eldest male child.
    • The main line itself flows through the only survivor of the Nyissan massacre, the king's "youngest grandson." Hopefully this was a one-off and all other all-male lines are extinct. We don't need another random challenger.
  • The book Charley by Jack Weyland has a typical Mormon son (except that he has no siblings) who marries an only child and together they have exactly one child.
  • In Charlie and the Chocolate Factory, not one of the five Golden Ticket finders has siblings. (This also seems to be the case with Willy Wonka, who states he has "no family at all.")
  • Terry Pratchett and just about all of his protagonists. Though, considering how the Disc runs on narrativium, this may just be because the universe is aware of the trope. Meanwhile, Esme Weatherwax has an Evil Twin, and Tiffany Aching has about six older sisters and an Annoying Younger Sibling. Oh, and Mustrum Ridcully has a brother too.
  • The Elenium takes a humorous twist to the "never had to compete" bit mentioned in the trope description. Patriarch Bergsten is big and impressive note  because he was an only child and didn't have to worry about sharing food with other siblings.
  • In Georges Secret Key To The Universe, both George and Annie start out as this, but this is later subverted as George's baby sisters Juno and Hera are born between the second and third books and Nimu from the last book is Annie's half-sister.
  • In the original series of Goosebumps, sixteen protagonists of the 20 books are only children. The specific books featuring these protagonists are all four of the Monster Blood books (since all of them feature the same protagonist), both The Curse of the Mummy's Tomb and Return of the Mummy (for the same reason as the Monster Blood books), Welcome To Camp Nightmare, Piano Lessons Can Be Murder, My Hairiest Adventure, A Shocker On Shock Street, The Haunted Mask II, The Headless Ghost, Attack of the Jack-O-Lanterns, Vampire Breath, Calling All Creeps, Beware, the Snowman, How I Learned To Fly, The Blob That Ate Everyone, The Haunted School, and Werewolf Skin. Gretchen in How To Kill a Monster could be considered an only child in a biological standpoint. Subverted in I Live In Your Basement, in which the protagonist, Marco, actually dreamed he was the only child to his single mother while comatose from his head injury courtesy of a baseball bat during a softball game and that the girl that he dreamed doing the damage, Gwynnie, is revealed to be his younger sister.
  • Most of the characters in John Green's books don't have any siblings. He jokingly said that it's his way of telling his brother Hank Green that he doesn't exist in his mind.
  • Harry Potter:
    • Of the three main characters, we have Harry, whose parents died when he was a year old, Hermione, who has no siblings, and the Weasleys who are easily a case of Massive Numbered Siblings. Then again, maybe that's why Harry and Hermione marry who they do.
      • At one point, Harry wonders what his life would have been like if his parents had lived, and imagines that he might have had younger siblings.
    • Interestingly, Hermione was supposed to have a younger sister, but Rowling wasn't able to fit her in.
    • Death Eaters only have one child if any—just enough to satisfy plot needs: Nott, Malfoy, Crabbe, Goyle, Rosier, Mulciber, and Avery all have only one son. And these lines never go into three generations like real life would suggest. None of the original Death Eaters (Tom's era) have grandchildren in Harry's era, while none of the younger Death Eaters (Lily's era) have confirmed fathers who were Death Eaters (although there are some surnames that appear in both eras as Death Eater names).
      • Wizards live longer — much longer — than Muggles, though, so it may be that not enough time has passed for the third generation of Death Eater names to show, or they went to Durmstrang, or simply attended Hogwarts during some time period between Tom's school days and Harry's and then got out of the family business.
  • Both Lyra and Will in His Dark Materials are only children. Very few characters are stated to have siblings, with the Costa family being the only notable exception.
  • The only characters in The Infernal Devices who aren't only children are Tessa, whose search for her brother Nate who eventually betrays her, and is actually her cousin kicks off the plot, the Dark Sisters, Gabriel, whose siblings aren't seen until at least the second book, and Will whose younger sister comes to the Institute at the end of The Clockwork Prince. Aunt Harriet, who was Tessa and Nate's mother's sister, is dead. Everyone else's parents are either deceased or simply not there, leaving them only children.
  • Steve in King Of The Bench is the only child in his family. As a result, his mother is a "turbo-hyoer-worrywart" about all his athletic activities.
  • Protagonists and major characters in the Kushiel's Legacy series tend to be only children or have otherwise odd family situations. Of the three narrator-protagonists in the series, Imriel and Moirin both play the trope straight, while Phedre's situation is more complex (she has a sibling she never meets due to Parental Abandonment, but later gains a foster brother who is himself an orphan). Of the protagonists' main love interests, only Sidonie has a traditional sibling relationship; Joscelin has brothers and sisters but doesn't know them well because he was sent to a monastic order at the age of ten, while Bao was sold into slavery by his destitute parents as a young child before his sister was born. Other characters explicitly stated to be only children: Delaunay, Hyacinthe, his mother Anastaizia, Ysandre, her father Rolande, Snow Tiger, and the Rani Amrita's son. Others, such as Jehanne, are heavily implied to have no siblings.
  • Averted for Saleem's family in Midnight’s Children, but played straight almost everywhere else. (And even in his case, his grandparents were both only children.) Parents tend to be pretty rare too. This was likely a necessity to keep the Loads and Loads of Characters under control; if Saleem's father's family was as complex as his mother's, the book would probably have to be twice as long.
  • The Reynard Cycle: This is justified in the case of Hirsent. She had three children, but the first two died.
  • The majority of kids born to the characters in Star Wars Legends are lone children or part of a male-female twin set. Wedge had two girls and Leia and Han had twins and then a boy, but they're the exceptions; for that matter, those lone children are overwhelmingly boys. Actually, a lot of Star Wars characters fit that pattern.
  • Tortall Universe: The protagonist of Song of the Lioness quartet has a plot-significant twin, but her royal and noble supporting cast are almost all only children. In the case of Jonathan and Roger, it's explicitly for medical reasons: the Queen could bear no more children, and Roger's mother died, a condition stated to be very common. The follow-up series Protector of the Small averts this trope and has siblings up the wazoo.
  • The Wheel of Time contains a particularly egregious example. Throughout the first three volumes, Perrin never mentions any siblings and he explicitly says that he had no sisters. Then in the fourth book the trollocs come in and kill his entire family, including a boatload of siblings, some of whom are indeed female. Basically, they didn't exist until they became necessary to the plot.

    Live-Action TV 
  • Justified in The 100. Most of the characters were born on The Ark, a space station constructed from 12 original stations to shelter the remnants of the human race after a nuclear war. To conserve resources, the Ark has a strict one child policy, so everyone in the main cast is an only child with the exceptions of Bellamy and Octavia Blake, the latter of whom is an illegal second child who was kept hidden for most of her life.
  • Agents of S.H.I.E.L.D.:
    • Most of the titular agents seem to be only children: Fitz explicitly states that his only relative is his mother, and Skye was raised in an orphanage and never kept a foster family long enough to gain siblings that way. Simmons mentions her parents often enough to make it seem like that's the extent of her family unit, particularly since when she thinks she's about to die her wish is to pass messages on to her parents and Fitz, but no-one else. Coulson and May's parents are, respectively, frequently mentioned and featured in cameos, without any siblings in the picture, and Coulson later described as a classic only child. Meanwhile, Triplett appears to be the sole heir to his legendary grandfather's stash of cool vintage S.H.I.E.L.D. tech.
    • The only aversions are Ward and Koenig. Ward mentions two brothers and a sister: the two brothers played important roles in his back-story and both eventually appeared on-screen, though the sister was never mentioned again and may have been retconned out of existence. Koenig, meanwhile, appears to have a suspiciously well-stocked army of identical Back-Up Twins and one sister. Turns out they weren't clones or Life Model Decoys after all, just a bunch of brothers who looked a lot alike. The Un-Reveal is Played for Laughs after several seasons of speculaton.
    • Also averted for Simmons in the comics, where it's mentioned that she has a brother and a sister (and is The Unfavorite to her dad). It's unclear whether this is true for her in the show or not.
    • This is all possibly Justified in that S.H.I.E.L.D. has a reputation for hiring loners, and lacking an extended family network surely helps in this regard. Note that Ward, the only main character to mention having siblings, makes it explicit that they no longer have anything to do with one another.
  • Beverly Hills, 90210: Played with in both the original and the reboot.
    • At the start of the original series, twins Brandon and Brenda were seemingly the only ones with siblings. Eventually, it's revealed that Dylan has a half-sister and much later, a half-brother; Kelly and David become stepsiblings and gain a half-sister (see below) through their parents' marriage (additionally, Kelly has another half-sister through her dad); Steve has two half-brothers; and Donna has a half-sister ( her cousin Gina, who was the product of an affair her aunt had with her father). This would leave Andrea the only one of the iconic eight-member lineup without a sibling. Even in later seasons, most of the new characters were only children with the exception of Matt, whose brother dies offscreen anyway, and Noah.
    • In the reboot: Annie and Dixon are adoptive siblings, Silver is the half-sister of Kelly and David, Naomi has an older sister, Navid has several younger siblings, Ethan has a brother, and Teddy has a sister. Liam, Ivy, and Adrianna appear not to have siblings.
  • Very much averted in The Big Bang Theory. Howard grew up an only child, but discovered a half-brother Josh via his father. Sheldon has an older brother, George, and a twin sister, Missy; Leonard has an unnamed older sister and a younger brother, Michael; Penny has a brother Randall and an unnamed sister; and Raj has a younger sister, Priya, three unnamed brothers, and another unnamed sister. Bernadette, Amy, and Stuart have an unspecified number of siblings as well. Numerous aunts, uncles, cousins, nieces, nephews, and grandparents are also mentioned throughout the series.
  • Buffy the Vampire Slayer / Angel:
    • Almost all the main characters on both shows seem to be only children: Buffy (pre-Dawn), Xander, Willow, Cordelia, Fred, Faith, Spike and Wesley all seem to have no siblings. Only Angel (sister), Gunn (sister), Tara (brother), and Andrew (brother) are known to have had siblings - and two of those four were either already dead or were killed off straight away!
    • Andrew, interestingly, originally had to keep being introduced as "Tucker's brother", even though Tucker was a villain of the week who wound up being much less important to the series and only appeared in one episode.
  • Carnivàle provides a justified case of this, at least according to the "Gospel of Knauf" that outlines the series' mythology. One of the pitfalls of coming from a line of historic Avatars (one of the super-powered humans at the heart of the series' mythology) is that a woman is rendered infertile after giving birth to an Avatar—who, as per the rules of the universe, can only be the firstborn male child of his family. Hence, Avatars can only have older female siblings, and are very often only children.
  • Most of the main characters of Community seem to be only children, with the exception of Annie (younger brother), Jeff (younger half-brother), Pierce (half-brother), and Chang (brother and twin sister, whom he ate in utero).
    • Abed mentioned that Britta having a brother who works with disabled kids in the pilot, and I'm almost certain Troy mentioned having siblings.
  • In Degrassi, the vast majority of the Loads and Loads of Characters that have appeared over the years are only children: Snake (older brother), Liberty (younger brother), Craig (half-sister), and Holly J (older sister) are some of the few exceptions.
    • They seem to be averting this in the post Season 10 episodes. Out of the characters still on after season 13, Drew had a stepbrother, Alli has an older brother, Miles has a brother and sister, Tristan has a stepbrother, Maya has an older sister, etc.
  • Doctor Who:
    • Nearly all companions in both the classic and revived series are only children. The exceptions are Martha (a brother and a sister), Yasmin (a younger sister) and technically Captain Jack (who, as it turns out, had a brother, but this fact is only revealed in his spin-off Torchwood).
    • Adric had a brother. Emphasis on had.
    • Rose was an only child for her tenure as a full companion, but had a baby brother by the time of "Journey's End" due to Jackie and alt-Pete getting together.
    • River has a younger brother, although, like in Rose's case, we only hear about him in what is the epilogue for her parents' story arc and it's unclear if they ever met. Then again, given her parents' dangerous, unsteady lifestyle and how it got, you can understand why her parents might have refrained from having another kid until their space travel days had come to an end.
    • Sort of justified, however, in that someone with little ties to their place of origin to begin with would simply be more likely to follow an extraterrestrial oddball on a joyride through time and space than someone whose siblings or parents would get worried.
  • This is discussed in an interesting way in Everybody Hates Chris. Chris is jealous of Greg when he comes to stay with them because he's an only child and he expects all of the attention and does everything by himself, whereas Chris usually has to take care of his younger siblings. Near the end of the episode, Chris confronts Greg, and Greg says that the reason why he does everything by himself is not because he wants to, but because he has to, being an only child.
  • Averted in Friends: Joey has seven sisters, Rachel has two sisters, Phoebe has a twin sister and a half-brother, Monica and Ross are brother and sister, leaving Chandler as the only only-child. And that's justified seeing as his parents hated each other, his Dad was gay and they barely noticed the son they did have.
  • Rory is her mother's only child in Gilmore Girls but that might be because Lorelai made sure she didn't have another child out of wedlock. Of course, the basic premise of the whole series is that it focuses on a mother-daughter team.
  • Most main characters in Glee. Only Puck, Blaine, Sam, Quinn, Sue, and Jake have known siblings (though in Quinn's case, her sister is only mentioned, never seen). Finn and Kurt later become stepbrothers.
  • In The Good Place, Eleanor is an only child, her parents having divorced when she was eight. Chidi and Jason don't mention any siblings they could potentially have. Tahani does have a sister, but spent her life on Earth amounting fame and fortune so she could become more successful than her (she failed). Janet and Michael don't have siblings due to being celestial beings without families.
  • The fact that Claire from Heroes is both adopted and an aversion, having a little brother Lyle, produced vast speculation over his origins because it's so rare for a family with adopted children to have more than one.
  • House has the title character and as far as we know Chase, Thirteen, Taub and Kutner. It takes a while to mention Cameron's brother, Foreman's brother, Wilson's brother and Cuddy's sister.
    • Since House is based on Sherlock Holmes, Word of God states that House was originally intended to have a brother representing Mycroft, played by Hugh Laurie's comedy partner Stephen Fry, no less. The character was cut due to a combination of scheduling conflicts and not being able to find room for the character in the show's dynamic.
    • Also, we later learn that Thirteen does have a sister and a brother, who is euthanized by Thirteen when his Huntington's Disease worsens, and this results in Thirteen being imprisoned for a year.
  • How I Met Your Mother: Out from the five main characters, Lily is the only one who does not have siblings considering that her dad didn't do his parental responsibilities very well. Ted has a younger sister who very one appears once in the show]]. Robin also has a younger sister. Marshall has three older brothers who are more or less jerks to him. And Barney has a black older half-brother from his mother's side and three half-siblings from his biological father's side.
  • Most of the characters on Lost are only children (or raised as only children) with the exception of Charlie (who has a brother), Hurley (who has a brother), Juliet (who has a sister) and Mr. Eko (who has a brother). Desmond has three unnamed brothers who are never seen, and Charlotte has two unnamed sisters. Boone and Shannon are step-siblings. Jack and Claire are half-siblings but neither are aware of this.
  • Merlin zigzags the trope. At first, the core four characters (Arthur, Merlin, Gwen and Morgana) are all apparently only children. Arthur's mother died in childbirth, Merlin's father was run out of town before he ever knew he had a son, Gwen's mother is nowhere to be seen, and Morgana has a dead father and a Missing Mom. Arthur and Morgana are half-siblings through their father, and Gwen has a brother named Elyan who's spent the majority of his life running around, leaving Merlin the only one without siblings.
  • The Munsters: Eddie Munster is an only child, in spite of his parents having been married over one hundred years.
  • Evidently averted in Murder, She Wrote, as Jessica Fletcher seems to have a different niece or nephew in almost every episode.
  • In an exception to the vaunted realism of My So-Called Life, five of the seven youth characters (Brian, Sharon, Rayanne, Rickie, and Jordan Catalano) are only children, and the remaining two (Angela and Danielle) are each other's only sibling. These characters would have been born c. 1980, which was the beginning of the "Echo Boom", when Boomers settled down and started having families, and the birthrates rose.
  • Our Miss Brooks: Teenagers Walter Denton and Harriet Conklin are only children.
  • Runaways (2017):
    • Averted, despite it being an actual plot point in the original comics. Here, Nico had an older sister who died in mysterious circumstances, and Gert and Molly are foster sisters, Gert's parents having adopted Molly after hers died. Karolina, Alex, and Chase are still only children, though. At least until Karolina's mother gets pregnant again towards the end of Season 2.
    • However, this does still mean that five out of the six friends were the only children in their original family units, which is pretty rare by real life standards.
  • Sabrina Spellman has many aunts, but only a couple of cousins and no siblings in Sabrina the Teenage Witch.
  • The Sarah Jane Adventures:
    • Every protagonist is an only child including Sarah Jane herself. Her son is a special case, as he was grown in a lab by aliens.
    • Sky — Luke's new adopted sister in Series 5 — has similar-though-not-matching reasoning for being an only child (biologically, anyway). On top of that, Sarah Jane's parents died when she was a baby, which justifies her lack of siblings. Meanwhile, Maria's dad and Clyde's mum are divorced from partners with whom they didn't work out and Clyde's dad ran off with his wife's sister, whom it's revealed he impregnated, giving Clyde an unseen half-sibling/cousin. The only one with no excuse whatsoever is Rani, and to be fair not all parents in the present-day want more than one child anyway.
  • In Saved by the Bell, Kelly and Slater are the only children to have siblings. Jessie does end up gaining a stepbrother. Zack, Screech, and Lisa are all only children.
  • Schitt's Creek: David and Alexis's love interests, Mutt, Tedd, Stevie and Patrick, all appear to be only children. Mutt later gains a much younger brother, Roland Jr. Stevie is eventually de-facto adopted by the Roses, culminating in the renaming of the motel. Patrick being Clint and Marcie's only child has made Patrick very close to them and thus makes it harder to come out to them.
  • Smallville begins with the lonely Clark. Lex has also grown up without siblings. Lana's parents died when she was young. Pete and Chloe also appear to be without siblings. There is no reference to Kara having had any. Lois might be the one exception having grown up with a sister.
    • Jimmy has a younger brother. (Also named Jimmy.)
  • Stranger Things: Mike and Nancy are siblings, and also have a toddler sister. Will and Jonathan are brothers, and Season 2 shows that Lucas has a younger sister, Erica. However, Dustin and Steve have not been shown to have any siblings, and Eleven's biological mother fell into a catatonic state several years after she was born, preventing her from having any more children. Also, in Hopper's backstory, his deceased daughter, Sara, was also an only child.
  • Of all of the main cast of The Suite Life of Zack and Cody, London Tipton is the only one without a sibling. The titular twins have each other, Maddie has her younger brother Liam and is mentioned to have a sister as well, Moseby is revealed in one episode to have an older (yet much shorter) brother named Spencer, and in the same episode, Carey mentions she has a sister she recently doesn't talk to.
  • Almost all of the core characters on Teen Wolf are only children. Scott, Stiles, Allison, Lydia, Kira, Jackson, Malia and Liam are all only children. Derek and Isaac have siblings, but Isaac's brother is dead, and Derek's two sisters were either murdered or Put on a Bus to South America. If Derek had any other siblings, they likely died in the fire along with the rest of his family before the series began.
    • Technically, Malia had a younger sister when she was a child, but she died in a car accident. And since Malia turned out to have been adopted, she wasn't biologically related to the girl anyway.
  • That '70s Show had Hyde, Jackie, and Fez as only children. Eric had sister Laurie and Kelso eventually had brother Casey make an appearance, while Donna had a sister but was retconned into being an only child.
    • Actually, Kelso is mentioned to have 7 brothers and sisters, Fez mentioned at least one sister and Hyde eventually gained a half sister (Angie) through the discovery of his biological father, William Barnett. Technically, this would make Jackie the only only-child.
  • Almost every main character on The Vampire Diaries is an only child with the exception of Stefan, Damon and Matt. Caroline, Bonnie, Tyler, and Jeremy are all only child. Elena is technically an only child as well even though she grew up with Jeremy as an adopted brother (Jeremy is actually her biological first cousin)
  • On Zoey 101, Zoey is the only one of the main characters to have a sibling, her brother Dustin. Lola mentions a younger sister in passing (season three's "Surprise") who is never mentioned again and never seen, and none of the other characters seem to have siblings at all.

    Roleplay 
  • Dawn of a New Age: Oldport Blues features a cast of roughly forty teenagers, only a scant handful of which have siblings. While not all of the non-player characters have had focus turned on their family life, meaning it's possible they have relatives behind the scenes, it still leaves about thirteen out of sixteen main characters without siblings- the exceptions being Irene, who has three; Jenna, who has a little sister (ironically, given Jenna's new The Worm That Walks form, she's terrified of bugs); and Ciro, who has two younger siblings which are important to his background and development.

    Theatre 
  • Romeo Montague and Juliet Capulet from Romeo and Juliet are both only children. Tybalt and Benvolio are presumably only children as well, although Mercutio has a brother only mentioned in passing.

    Video Games 
  • Surprisingly averted in Dishonored 2, which sees Corvo (or his daughter Emily) return to his native Carnaka, where he'll reveal that he has a sister Beatrici who was also an adventurous type, and who he hasn't seen or heard from in several decades. She later shows up in the tie-in novel series.
  • Dragon Age:
    • The noble families of Ferelden in Dragon Age: Origins are strangely small:
    • The Cousland family has two children, both of them grown, and a single grandson. All of them save the elder son (and possibly the second child, one of the possible origins) are killed in the prologue. By the end of the game Fergus is the heir and sole member of the family.
    • The Guerrin family consists of two brothers, one of them unmarried, and a son barred from succession because he is a Child Mage.
    • Rendon Howe has three adult children: one becomes a Grey Warden and thus is unable to procreate; his only daughter has one son; and his second son is dead by the end of the game.
    • Loghain Mac Tir has an only daughter, the Queen.
    • Queen Anora never had any children with her husband, King Cailan, who was likewise the only son of King Maric, who was the only son of Queen Moira, who was the only daughter of King Brandel, who was the only son of King Vanedrin. And, of course, Alistair is the last scion of the Theirin family, which does not bode well since he is a Grey Warden.
    • Even the minor families of Ferelden seemingly have only one or two children, and some even appear unmarried or childless. How this feudal, hereditary monarchy can survive such an impending power vacuum is never addressed. It's possible that, because this is a video game where the focus is not dynastic politics, many of these families are actually larger, or have extended, female-line branches that are simply not seen, but for a series that revels in creating a huge codex of extraneous lore, that would be a strange oversight.
    • Dragon Age: Inquisition has Dorian Pavus, the only son of the noble House Pavus of Tevinter. His only-child status is both justified, as his parents despise each other and married for political reasons and thus only cared to have the necessary heir, and problematic, as Dorian is gay and refuses to hide it, preventing him from carrying on the bloodline, driving his father to desperation that led to Dorian leaving the family altogether.
  • Anila of Granblue Fantasy experiences this as the crew met her. Since she’s an only child, she wonders what it is like to have siblings at the end of her second Fate episode. Lyria suggests calling the player character brother/sister and Anila tries but finds it weird. Vyrn then observes that Andira and Lyria act more like sisters instead and they eventually bond over that.
  • Link and Zelda from The Legend of Zelda have been portrayed as only children in almost all of their various incarnations. The exceptions are Zelda II: The Adventure of Link, where the sleeping Zelda had a cruel brother whose evil wizard adviser was responsible for putting her into her slumber, and The Legend of Zelda: The Wind Waker, where Link's younger sister Aryll gets kidnapped by the Helmaroc King and must be rescued by her brother.
  • Life Is Strange:
    • In a game that delves into a lot of family drama, it's noteworthy that Max, Chloe, and Rachel - the protagonists of the first two games - are all only children.
    • Averted with many of the minor characters at Blackwell Academy, however. Kate Marsh has two sisters, which can become a minor plot point. Drew and Mikey North are brothers who share a roughly equal amount of screen time. Then there's an interesting case with Nathan Prescott, who has an off-screen older sister who emails him during the game and seems to be a rare positive influence in his life, but who never becomes plot relevant.
    • Chris, the protagonist of The Awesome Adventures of Captain Spirit, is also an only child. Justified (if such a thing needs justification) by the fact that his mother died when he was quite young, so it's possible his parents would have liked more children but circumstances intervened.
    • Completely Averted with Sean and Daniel Diaz, the brothers who are co-protagonists of Life is Strange 2.
  • In the Persona series, this is fairly common. Virtually all party members and most Social Links are only children, and among the few that have siblings, those siblings are usually dead or much older/younger than them.
  • Pokémon
  • Out of roughly 20 members of the Van Der Linde gang at its peak in Red Dead Redemption II, only two are confirmed to have siblings, Micah and Hosea. Micah has a brother and Hosea's dad was a bigamist whom he figures had roughly 100 children. They had a pair of brothers that ran with them prior to the events of the game who died in the botched Blackwater ferry heist. Justified somewhat as the game takes place in 1899 when a lot of women died in childbirth (like John Marston's mom) and a lot of people died in childhood, some of them may have had siblings who died as kids. Also, the reason they're all together is that they had rough childhoods and Dutch picked them all up. Neither Arthur the protagonist of this game nor John the protagonist of the sequel Red Dead Redemption has confirmed siblings.

    Western Animation 
  • Caitlin Cooke's the only one of the main six in 6teen confirmed to be an only child.
    • Jonesy and Jen both have siblings (Jen has an older sister while Jonesy has two younger brothers) and the are stepsiblings to each other (due to Jen's mom and Jonesy's dad getting married). They also eventually end up gaining a baby half-sister.
    • While Jude and Wyatt are never confirmed to have any siblings, but they're also never confirmed to be only children like Caitlin is—Wyatt's mentioned to come from a large family, but whether this means a large immediate family or a large extended family is uncertain.
    • Nikki's a strange example, because a couple episodes in the first season pretty much explicitly state that Nikki has siblings (in "Dude of the Living Dead," Jen claims that Nikki has a sister and in "The Fake Date," Nikki mentions having a nephew). However, later episodes (such as the Series Finale) imply that Nikki's an only child like Caitlin is.
  • On The Adventures of Jimmy Neutron: Boy Genius, none of the main characters are shown having siblings—Sheen was sometimes mentioned as having a younger sister, but she was never actually seen in person. Jimmy's lack of a brother was even the impetus of the plot of the episode "I, Brobot", where he makes one.
  • The Amazing World of Gumball The main character's family has three children, but of his approximately twenty classmates, only Penny, Tobiasnote , and Idaho are known to have any siblings while many of the rest are shown to be only children. Colin and Felix are very similar but not confirmed to be brothers. Among the rest of the school and Elmore's many citizens, the only ones with known siblings are Margaret, Louie, Hot Dog Guy, and a few very minor characters, while Richard, Nicole and Rocky are only children.
  • Arthur: Most of Arthur's friends are only children, with only a handful having at least one sibling. In the earliest seasons, it seemed like Arthur, Francine and Prunella were the only ones who had siblings. Later ones would introduce siblings for Muffy, Binky, Molly and Rattles, and also introduce more characters who have siblings from the get-go, but that's still only a fraction of the cast.
  • Code Lyoko, aside from Yumi (one younger brother) and Odd (five older sisters), most of the children in Kadic are shown to be only children.
  • Curiously, every child who had a prominent appearance in Danny Phantom is shown as being an only child. The only one who isn't is Danny himself. He has an older sister and, if you wanna stretch it, an Opposite-Sex Clone whom he treats like a little sister.
    Sam: If you don't mind, we'll be over there doing the "glad-I'm-an-only-child" dance."
  • Out of all the main children of Doug, the ones who are only children are Patti, Roger, Boomer, Willie, Beebe, and Connie. Doug has his older sister Judy (and later, a baby sister in the Disney series), Skeeter has his little brother Dale, Ned has Massive Numbered Siblings as revealed in the Disney series, Chalky is revealed to have a(n) (unseen) older brother, and Al and Moo Sleech are both twin brothers.
  • On Ed, Edd n Eddy, Ed and Sarah are brother and sister, Eddy has an older brother, and the Kankers' are sisters. Double D, Rolf, Kevin, Jimmy, Johnny and Nazz are all presumably only children—Double D's the only one confirmed to be an only child, while none of the other characters mention having siblings.
  • In the early days of The Fairly Oddparents, the only ones shown to be siblings were Vicky and Tootie. Since then, a character is an only child unless a story involving siblings is written. Several seasons later Sanjay was revealed to have a step brother that hasn't been mentioned since, and Timmy wished for an older brother that he inevitably unwished. In season six Timmy got a godbrother in Poof. Up in Fairy World, Wanda was eventually revealed to have a sister, and Cosmo has a brother.
  • Of the main three characters of Harvey Beaks, the title character has a younger sister (Michelle, who was just an egg when the show started), and Foo and Fee are brother and sister (and half-adopted into Harvey's family). The only siblings of the supporting cast are Claire's unseen Big Sister Bully, Rooter's younger brother, and Dade's many younger siblings. This leads to Fee looking for advice on being an "honorary sister" to Michelle, but finding no one with experience to speak of.
  • On Hey Arnold!, Gerald has two siblings and Helga has a sister, but otherwise all the kids seem to be only children.
  • Hilda: None of the protagonists (Hilda, Frida and David) have siblings.
  • In King of the Hill, the three main kids—Bobby, Connie and Joseph—are all raised as only children, as were Hank and Luanne. Hank eventually gets two half-brothers, though (one born in his father's old age, one he just never knew about); Joseph also has at least one half-sister through John Redcorn, but still doesn't realize that he's related to either of them.
  • Five of the eight main kinds on The Magic School Bus are only children (these are Ralphie, Tim, Arnold, Phoebe and Keesha). Dorothy Ann has a younger sister named Evan while Wanda and Carlos both have younger brothers—Wannda's brother is named William and Carlos's brother is named Mikey.
  • In Metalocalypse, Pickles is the only member of Dethklok with a sibling.
  • In Miraculous Ladybug, the two main characters, Marinette and Adrien, are both only children. Among the main cast, Alya is the only major character specifically shown to have siblings, having two younger twin sisters and an older sister.
  • In ¡Mucha Lucha! Rikochet, Buena Girl and the other characters have no brothers or sisters. Only The Flea has a baby sister named Pulgita.
  • Averted for the most part in My Little Pony: Friendship Is Magic: Rarity has her younger sister Sweetie Belle; Pinkie Pie has her sisters Limestone, Marble, and Maud; Twilight has her older brother Shining Armor and sister-in-law Cadance; Fluttershy has her younger brother Zephyr Breeze; and Applejack has her large family, including her older brother Big Macintosh and her younger sister, Apple Bloom. They are pretty important supporting characters and even have a few episodes of their own. Of the main cast, Rainbow Dash and Starlight Glimmer do not appear to have siblings, while Spike's and Scootaloo's families have yet to appear (although a Tie-In Novel shows that Scootaloo stays with her aunts, as her parents are usually away on business).
  • Phineas and Ferb seem to play this halfway—there's the title characters and their sister Candace, Jeremy / Susie and Irving / Albert as siblings, but Isabella, Baljeet, Buford, Stacy and Vanessa all get lots of screen time and give no indication of having a sibling. Adults having siblings seems to be more common—Lawrence has at least one (Ferb has six cousins from what we know to be Lawrence's brother, and Scottish cousin whose relationship to Lawrence has not been revealed), Linda has Tiana and Doofenshmirtz has Roger.
  • On Ready Jet Go!, all of the kids — Jet, Sean, Sydney, Mindy, Mitchell, Lillian, and Zerk — are only children. In "So Many Moons", Mindy says that her parents are thinking about having another baby, but that arc was soon dropped and forgotten about.
  • Of the six main characters in Recess, three (Gretchen, Gus and Mikey) are only children. TJ and Vince have elder siblings who have appeared in the show, and Spinelli mentions having an older brother in jail.
  • Mostly averted in Rocket Power. Out of the main cast, Sam is the sole only child in the series. Sister and brother team Reggie and Otto have each other. Twister has his older brother Lars, and even his little cousin Scottie, who is an only child himself and looks to Twister as a surrogate brother.
  • Rugrats:
    • Most of the babies were only children, but this changed after the respective releases of the first two movies: Tommy gained Dil as a younger brother after the first movie, and Chuckie gained Kimi as a stepsister after Rugrats In Paris. Among the main kids, Angelica is the last only child remaining (Phil and Lil are twins, and Susie is the youngest of four siblings).
    • Angelica's being an Only Child was actually made the plot of one episode, where she became upset at being the only one like this (an unusual turnabout, since in previous episodes she was glad to have no siblings). The resolution came when Tommy pointed out that with the way she occasionally picks on them but still cares, Angelica's really like a big sister to all of the younger kids.
  • The Simpsons: Aside from the Simpsons family, The Flanders', Apu and Manjula, the Hibberts and Sherrie and Terri's family the rest of the couples have one child only. With the exception of the above, most of the kids from the elementary school are only child. This is justified in an issue of Simpsons Comics that ends with all the adults in Springfield becoming sterile.
  • South Park: Most of the minor characters seem to be only children (except for Craig, who has a younger sister), and out of the five "main boys", Butters and Cartman grew up as only children. (Except that Cartman actually has an older half-brother). "Reverse Cowgirl" states that Clyde has a sister, but she's never (explicitly) appeared.
  • Most of the characters in Star vs. the Forces of Evil don't appear to have any siblings, including Star herself (Which is strange considering how many extended family members she has). Ludo and Pony Head both have Massive Numbered Siblings, and in season 3 Marco finds that he will have a younger brother, who then turns out to be a sister in season 4.
    • This is actually a plot point in the third season regarding Eclipsa's daughter, Meteora, who is half monster. She was an only child, leading to the reveal that after Eclipsa was imprisoned, her daughter was replaced with an average girl to become the next queen.
  • Steven Universe: Steven is an only child because he could only be born by his mother giving up her physical existence. Full gems don't have biological family on account of their Bizarre Alien Reproduction, though the Diamond Authority have a sibling-like relationship, and Amethyst considers the gems made on the same planet as her "Famethyst". Of the human characters, only six are expressly shown to have siblings: Peedee and Ronaldo are brothers, Jenny and Kiki are twin sisters, and Sour Cream and Onion are half-brothers with a wide age gap. Connie, Lars, Sadie, Buck, Kevin, and all the adults are either only children or their siblings are never mentioned (though we do eventually meet a cousin of Greg's).
  • In Teen Titans, with the exception of Starfire (who has an older sister and, in the tie-in comic, a younger brother), all of the main Titans are only children. (The comics would eventually state that Raven has many half-siblings through her demonic father, but that became canon after the show ended.)
  • Averted in Total Drama—taking both the show and supplementary materials into account, only three characters (Zoey, Cody and Beth) are only children, but about half of the original cast have siblings mentioned.
  • Zigzagged in Voltron: Legendary Defender. Lance, Pidge, and Hunk are all shown as having at least one sibling. Meanwhile, Allura and Keith are both only children (though justified in the latter's case since his parents were only together for a few years), and Shiro's family goes unmentioned altogether.

    Real Life 
  • From 1979-2016, China's one child policy prevented urban married couples from having more than one childnote . This has led to coinage of the term Little Emperor Syndrome to describe the social implications of such a phenomenon when it has an effect on a nationwide level. The law was slowly walked back over time, first couples where both spouses were only children could have two, then if one spouse was , and now all couples can have two children.
    • It's also led to a fairly significant gender disparity; sons have always been more desirable than daughters, and all the more so when a couple is only allowed one child. At the moment, there are 33.59 million more men than women in China, with the result that a whole lot of men in a family-oriented culture are unable to marry. This was part of the reason China expanded the limit to two children starting in 2016, and is reportedly even considering ending family restrictions altogether.


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