->''"'''Do?''' What does he '''do?''' Why, he's '''adorable!''' And people will '''love''' it!"''
-->-- '''Dr. Forrester,''' ''{{MST3K}}''

Cousin Oliver is that inexplicable kid added to the show's roster, probably in an attempt to liven up an aging cast.

Sometimes Cousin Olivers are then afflicted with {{SORAS}}. This doesn't always make it better. Compare it to TheBumblebee, who is generally less annoying.

If the addition is a literal cousin, also {{Nephewism}}. Very susceptible to becoming TheScrappy.
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!!Examples

[[foldercontrol]]

[[folder: Anime and Manga ]]

* Chibi-Usa's addition to the ''SailorMoon'' cast wasn't initially for this reason, but the writers did end up using her for a younger demographic marketability in the retooled fourth series of the anime. Sailor Luna in the live-action series could also be an example of this trope in the same fashion.
** And who hasn't read a MarySue FanFic where the author surrogate was [[DigimonAdventure Ken's]] twin sister, or [[SailorMoon Usagi's]] long-lost second child, or what have you? Be honest, we feel your pain.
*** Meh, I've never read those past second paragraph.
* Arguably, Max from the ''{{Pokemon}}'' anime fits this trope.
* Parodied/subverted in the {{Hellsing}} TV series with the previously unmentioned "Integra Hellsing's sister." [[spoiler: She's actually the last of a kind of bizarre vampire that used mind-control abilities to make the {{Muggles}} (including the BattleButler) "remember" her. Also, she actually manages to seriously hurt Integra,]] something even the Valentine Brothers couldn't do.
* Sort of parodied in the anime version of ''ExcelSaga'', where a few of the characters were explicitly created out of thin air (did not appear in the original manga) because the writers were out of ideas.

[[/folder]]

[[folder: Comic Books ]]

* Danny Chase in the comic book version of TeenTitans. He was even designed to ''look'' like Cousin Oliver. Combine this with abrasive personality, lack of codename, costume, or original powers and he quickly became the franchise's [[TheWesley Wesley]], as well.
** In other words, Danny Chase is to the Teen Titans what Zam, Jayna, Wendy and Marvin are to the ''SuperFriends'' Justice League.

[[/folder]]

[[folder: Film ]]

* The addition of [[MeaningfulName Howard Phillips]] (Jason Barry) to the third film in the ''{{Re-Animator}}'' series, replacing the lead character of the last two films, Dan Cain (Bruce Abbott). Though not a kid, Phillips is significantly younger; producer/director Brian Yuzna admitted freely that Phillips' addition was due to Yuzna's desire not to make a film about "two middle-aged guys".
* Minya was added to the {{Godzilla}} franchise due to the increasing number of kids going to see the movies. Of course, [[TheScrappy the less said about him the better.]]
** This was directly used in ''Godzilla's Revenge'', where a bullied schoolboy fantasizes about going to Monster Island and hanging out with the (now talking) Minya.
** Likewise, there's Baby Godzilla AKA Little Godzilla AKA Godzilla Junior.
***Technically, fans actually LIKED Baby Godzilla since he actually looked like a...well...a baby Godzilla. That, and he actually grew up into a full-grown Godzilla rather than staying a small annoying...thing.

[[/folder]]

[[folder: Live Action TV ]]

* The TropeNamer was added to ''TheBradyBunch'' toward the end and was the last gasp of the show. He's also cited as the definitive proof of the franchise having [[JumpTheShark jumped the shark]].
** In Oliver's defense, he was only added to the show after Robert Reed quit mid-season.
** Reed didn't have a chance to quit, though considering his feuding with Sherwood Schwartz, chances are had the show continued, he'd have been gone.
*** Depending on who you ask, he either quit or was fired. Either way, he was gone. Ever wonder why he had so many [[PutOnABus business trips]] the final season?
*** Well, Oliver (the character, probably not the actor) did show up at the end of ''A Very Brady Sequel'', where he ran out into traffic at the end and supposedly got hit. No one even bothered to go take a look.
* Stephanie on ''AllInTheFamily''.
* Averted and somewhat parodied on ''{{Buffy the Vampire Slayer}}'' with Dawn. Buffy comes home at the end of an episode and suddenly has a little sister, when up to before she'd always been explicitly an only child. Everyone acts like she'd had a sister all along, and no one notices anything strange. An entire episode passes like this, leaving viewers to wonder if this sudden appearance is part of the plot or just the writers shoehorning in a new character with no regard to continuity. Luckily, we soon learn that Dawn is there because of a magic spell which altered everyone's memories (including hers) and that she's actually a cosmic {{mcguffin}} in human form.
**There was a good bit of bitching among the fanbase about the addition before they realized she was plot relevant.
* Olivia on ''TheCosbyShow''.
* Sam on ''DiffrentStrokes''.
** Peter Cooksley, a Lawrence kid clone.
* ''EightIsEnough'' had Cousin Jeremy (Ralph Macchio) who went on to become the Karate Kid.
** He had ''nothing'' to do with TheKarateKid, other than being the same actor.
* Andy and Pippa on ''TheFactsOfLife''.
* In ''FamilyMatters'' the Winslows adopted 3J, a streetwise little orphan. Since there already was a CousinOliver in the show, little Richie, they merged into a single split-personality CousinOliver ("Maybe we shoudn't do this." "Oh, come on, it'll be fun!").
* ''FamilyTies'' and ''GimmeABreak'' also tried this.
**Adam Keaton on FamilyTies was a [[ILoveLucy Little Ricky]], not a CousinOliver.
** Joey Lawrence for ''Gimme A Break''. The Lawrence kids made a cottage industry of being a Cousin Oliver.
* Penny from ''GoodTimes''. Introduced to give Willona someone to care for, since the Evans kids weren't really kids anymore.
** Never heard from the Penny actress again, did we? Guess being a part of a powerful media family like the Evanses was too much for her.
* ''GrowingPains'' had two: Chrissy, the youngest Seaver daughter, and then later Leonardo Dicaprio's homeless-kid character.
* ''LittleHouseOnThePrairie'''s final seasons featured a hilarious number of random "adorable" orphans shoehorned into the Little House after the original kids left home. Albert (adopted off the streets of the Big City), James and his sister Cassandra (parents killed in a wagon crash), Jenny (left on Laura's doorstep by her dying brother-in-law), etc. This is despite the show ''already'' having two younger Ingalls sisters in Carrie and Grace. Oddly enough, as more than one fan has remarked in alarm, Pa Ingalls never did build an addition onto his two-room shanty.
* ''MarriedWithChildren'' had Seven, who started as a CousinOliver (since both "children" were college-aged). After Katey Sagal, whose real-life pregnancy had been written into the show, had a miscarriage, he became a BrotherChuck when he was removed with absolutely no explanation (though he had his FaceOnAMilkCarton for LampShadeHanging effect).
* ''{{MST3K}}'' sharply parodied the Trope with "Timmy Bobby Rusty", a lisping kid whom Dr. Forrester employed to help boost the show's sagging ratings. He lasted exactly one segment.
* In ''MyThreeSons'' they formally adopted Chip's orphan friend Ernie.
** Justified, sort of, by the need to maintain the accuracy of the show's title after Mike was [[BrotherChuck written out of the show]].
* Justin on ''PowerRangersTurbo''.
* The diner in the {{Supernatural}} episode JumpTheShark is called CousinOliver's... and the plot is about a possible younger brother turning up.
** This trope is very depressingly subverted though, when it turns out that the character in question [[spoiler: ''was'' actually their half-brother, emphasis on "was" because he was already dead before the start of the episode.]]
* The Porters' foster child Declan in the last series of ''TwoPointFourChildren''. He also served as a JonasQuinn for the departing Jenny.
* Played with in ''The X-Files'' in which one episode had a man who assumed this identity because he associated with the original Cousin Oliver.
** That series played with other shows a great deal, and that in turn got played right back on them when the series ending for ''Strangeluck'' had Chance directed to seek out Mulder.
* Somewhat lampshaded in MyNameIsEarl, when Earl has a dream that he is happily married, and he remembers when "all our kids stopped being cute and Cousin Wendel came to live with us."
* It's questionable whether this is played straight or not. Oliver [[JonasQuinn replaced]] Jeff in ''{{Coupling}}''. Considering how the TropeNamer is [[TheBradyBunch Cousin Oliver]], it could be done as a parody. However, in one episodes after season 3, Jeff is actually '''''removed''''' from a clip of a dinner party.

[[/folder]]

[[folder: Video Games ]]

* Robots don't age, but Capcom added the rookie [[TheWesley Axl]], who acted all of 13 to the cast of ''{{Mega Man X}}7'' to contrast with veterans X and Zero. If that wasn't bad enough, X was [[CharacterDerailment Derailed]] into retirement (no, not [[DeadlyEuphemism "Retirement"]]) to force you to use Axl.
* Joey [=MacAdoo=], Samantha Pearce, and Arthur Chen in the ''BackyardSports'' series, replacing the much more mature Jocinda Smith, Sally Dobbs, Kenny Kawaguchi, and Billy Jean Blackwood. Joey is easily becoming TheWesley now.

[[/folder]]

[[folder: Web Original ]]

* Parodied by [[http://www.theonion.com/content/news/cousin_oliver_to_join_white_house The Onion]] (who else, really?)
* {{Wheel of Time}} randomly adds a young boy named Olver to the cast.
** I'm not sure it was so randomly, there is some very powerful evidence that he is [[spoiler:The reincarnation of Gaidal Cain]], and he will probably be important in the final book.
*** That particular theory was {{Jossed}} by Robert Jordan before his death, as Olver is too old. However, he did say he would be important in some other way.

[[/folder]]

[[folder: Western Animation ]]

* [[TheScrappy Scrappy-Doo]], from ''ScoobyDoo'' .
** There's also Flim-Flam, the [[EthnicScrappy ethnic kid]] from ''The Thirteen Ghosts of ScoobyDoo''.
* ''TheSimpsons'' spoofed the idea by adding a teen named Roy for only one episode ("The Itchy and Scratchy and Poochie Show").
** Which was based on a real suggestion given to the writers by an executive who wanted to add a new kid who had "the genius of Lisa but the attitude of Bart."
*** This might count as a double-spoof, since the entire plot of that episode revolved around the Itchy and Scratchy writers adding an extra character to shore up their own show's ratings. He wasn't a Cousin Oliver, though, in fact he was [[{{thepoochie}} a trope unto himself.]]
* Sharko, from the final season of ''{{Sealab 2021}}'', is a spoof of this character type.
* Also not a kid, but the shoehorning in of Lola Bunny into the ''LooneyTunes'' lineage (even being a baby in ''BabyLooneyTunes''...even though the gang didn't know her in ''SpaceJam'') somewhat rubs this editor the wrong way.
* Spoofed in ''{{Drawn Together}}'' with Strawberry Sweetcake.
* Spoofed in the ''PinkyAndTheBrain'' episode "Pinky and the Brain and Larry" before ExecutiveMeddling [[ReTool retooled]] the show into ''[[FunnyAneurysmMoment Pinky, Elmyra and the Brain]]''.
* The animated version of Godzilla ([[GodzillaTheSeries not that one]]) added a baby called "Godzooky".
* Hana in Season 4 of KimPossible.
* ''TheCritic'' parodied this Trope when Duke Phillips attempted to add a cute kid with an endearing speech impediment to Jay Sherman's show to try to boost his ratings.
-->'''Jay''': Well I find you "wepulsive" and "wepugnant"!
-->'''Kid''': (suddenly normal-voiced) Hey, that speech impediment shtick is copyrighted. You'll be hearing from my lawyers!
* Parodied / referenced in ''BatmanTheAnimatedSeries'', where "Little Cousin Spunky", the new child star added for the last season of Baby Doll's sitcom was also designed to resemble Cousin Oliver. (Also, the original cousin Oliver's actor voiced one of the actors that Baby Doll kidnaps.)
** Also subverted in this episode -- Robin watches the entire series trying to find clues; Spunky turns out to be the only enjoyable thing in the show... well, the only thing Robin liked.
* Poof, Cosmo and Wanda's son on ''TheFairlyOddparents.''

[[/folder]]

[[folder: Webcomics ]]

* Every once in a while an example comes along that defies the precedent, that's exactly what happened in ComingUpViolet. As many readers know, the primary schick with FurWillFly was that Brad was the only human living a world filled with furries. ([[spoiler:Well, at least until Brad sets a whole mess of pandimensional aliens [like himself] free from a detention facility, but that's neither here nor there.]]) The comic's sequel changes this dynamic by introducing Dawn, a young -- incredibly normal -- teenaged girl to the mix. However, rather then being resigned to the Scrappy Heap, the fans love her and she adds quite a bit of character to the cast -- indeed, being an even bigger FishOutOfWater then Brad ever was. (May overlap with the JonasQuinn.)
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