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[[quoteright:300:[[Manga/ChronoCrusade http://static.tvtropes.org/pmwiki/pub/images/Satella_4375.jpg]]]]

If your show is aimed at a younger audience, this young woman (usually in her mid to late teens, sometimes in her early 20's) will be older than the {{Shorttank}} and be the girl everyone thinks is hot (if they're nice) or an AlphaBitch (if they're not), though their personalities can vary widely from {{Tsundere}} to EmotionlessGirl to {{Tomboy}}. The Shorttank girls often admire them, even when they playfully flirt with the much younger male lead and steal everyone's attention. The ShrinkingViolet will admire and at the same time envy how more open her Big Sister figure is with her thoughts and feelings.

This young lady may or may not catch a {{shonen}} series lead's eye; if he hasn't entered puberty yet, she's more likely to be paired up with either TheBigGuy, the TeamDad or the BigBrotherMentor. Or ''maybe'', if she's persistent enough, she'll end up in an OddCouple with an AloofBigBrother or a single father. She may also evolve into a TeamMom thanks to CharacterDevelopment.

Expect a somewhat jaded character who prefers to work the system to their advantage rather than admit to others she's become cynical. If old enough to drink, she may also be a HardDrinkingPartyGirl, or even TheLadette; if not, she'll often be a LethalChef and/or BigEater. If older than the standard, she might be a ChristmasCake as well. She's often a GoodBadGirl and frequently the person who keeps the main characters in line. Sometimes she's even portrayed as the only person the protagonist is truly afraid of.

Note that, while less wide-spread, this trope can be gender-swapped.

Compare OneeSama, also a sister figure but usually more ladylike, quiet and graceful, and AloofBigBrother, where the status causes a conflict between the (usually male) siblings.


[[folder:Anime & Manga]]
* Satella from ''Manga/ChronoCrusade'' fits this trope somewhat, although Azmaria is the only one that really looks up to her. (Rosette is generally more frustrated with her antics than anything, although there's moments where they share bits of advice with each other.)
** And of course, Rosette plays the role straight towards Azmaria, as the picture above shows.
* Milly Ashford, the StudentCouncilPresident from ''Anime/CodeGeass'', is actually referred to on the show's official website as a "reliable older sister" to her friends (when she isn't tormenting them with her playful antics and "magic spells"). She's one of the more popular side characters due to this, as well as her... um... [[Film/MontyPythonAndTheHolyGrail huge tracts of land]] and eagerness to grope the female Student Council members.
** Cornelia is one to her little sister Euphemia, who in turn was one to Nunnally.
* Erza Scarlet from ''Manga/FairyTail'' definatly qualifies. She is respected and admired by her fellow guild mates and especially Lucy looks up to her. (In a letter Lucy wrote to her mother she describes Erza as cool, beautiful, warm and full of passion) She is someone relied on by everyone and capable of keeping the chaotic guild under control with [[DeathGlare one glare]].
* In ''Manga/OnePiece'', Nami and Robin tend to alternate between this and the TeamMom trope. Nami is definitely the CoolBigSis type to both Vivi and Chopper, while to the rest of the crew, she is definitely the TeamMom. Robin is the CoolBigSis to Nami, and is often referred to as "oneesama" by Nami.
** Nami also has Nojiko, her "sister" who was adopted with her by Bellemere.
* In ''Anime/MyNeighborTotoro'' Satsuki is this for Mei (Creator/HayaoMiyazaki seems to like this trope).
* In ''Manga/RanmaOneHalf'', though she [[{{Flanderization}} ends up]] playing the YamatoNadeshiko so straight she becomes a parody of it, Kasumi Tendô is a gentle, kindhearted woman who holds the Tendô household together, always tries to comfort her family, thinks the best of others and displays a subtle comic wit, often trying to pull off a one-woman BokeAndTsukkomiRoutine. [[{{Tomboy}} Akane Tendô]], her {{Tsundere}} little sister [[PromotionToParent whom she helped raise]], ''adores'' her "Kasumi-neechan" and desperately wants to be like her, but without giving up her martial arts abilities.
* ''Anime/NeonGenesisEvangelion'': Misato Katsuragi tries to be one to her wards, [[TheHero Shinji]] [[BattleCouple and]] [[FieryRedhead Asuka]]. Unfortunately, [[BrokenBird they are two severely traumatized kids]], and her own issues made her hard to connect with them and help them. As a result of it, she failed them when [[HeroicBSOD they]] [[MindRape needed]] [[BreakTheHaughty her]] [[BreakTheCutie the]] [[DrivenToSuicide most]].
* Two aversion in ''Anime/{{Slayers}}''; While Lina is the first to admit (in the manga) that her older sister Luna is "really cool" she's also terrified of her [[NoodleIncident due to some unfortunate events during their childhood ]] ([[SubvertedTrope not that Lina didn't deserve it]]). (Lina is so scared of Luna that near the end of Slayer's Try she actually says (entirely without irony) that she has to save the universe because otherwise "my big sister is gonna kill me.") Amelia's older sister Gracia [[spoiler:AKA [[GoldfishPoopGang Naga the White Serpent]]]] did teach her some magic (per WordOfGod) but she also ran away after witnessing the horrifically bloody assassination of their mother. Amelia hasn't met her since, and (in the novels at least) misses her terribly.
* Mai Kujaku/Valentine in ''Anime/YuGiOh'' to Shizuka/Serenity and, to a lesser extent, Tea/Anzu.
** Aki Izayoi (Akiza in the the dub) in ''Anime/YuGiOh5Ds'' fits this, generally keeping track of [[HalfIdenticalTwins Rua and Ruka]] after she outgrows her DarkMagicalGirl leanings in the beginning of the show.
** A literal example (where she's truly the character's big sister) occurs in ''Anime/YuGiOhZexal'', with Yuma's sister Akari; given that the BikerBabe and IntrepidReporter Tropes could both apply to her, she certainly qualifies. (Yuma is actually the first protagonist in the franchise to even ''have'' a sibling.)
* Urd of ''Manga/AhMyGoddess'', to both younger sister Skuld and Keiichi on occasion, though with mixed success. Skuld seems to regard Belldandy more as her Cool Big Sis than Urd.
* Shigure Asa of ''VisualNovel/{{Shuffle}}'', who is also a GenkiGirl {{Bokukko}} to boot. [[spoiler:And she's the one who gets the guy.]]
* Override in ''Anime/TransformersCybertron'' fits the type even if she ''is'' a [[HumongousMecha Giant Robot]] (and is only a [[ShesAManInJapan girl in the dub]]). She even refers to one of the humans as "little sis".
* ''Anime/{{Pokemon}}''
** Kasumi (Misty) has not one, not two, but ''three'' Cool Big Sisters, actual sisters at that. She doesn't exactly idolize them, though, getting along only with the eldest of the trio.
** A more straight example is LadyOfWar Soledad (Saori) from ''Advanced Generation'', who acts like a cool big sis to [[ShipperOnDeck May and Drew]].
** Zoey/Nozomi tries to act like this for Dawn/Hikari, but ends up looking like [[ButchLesbian something else.]]
** Dawn's Togekiss, who acts in this role towards Piplup. This is mainly seen by Togekiss deflecting wayward Draco Meteor attempts back at Ash and Gible to keep them from falling on Piplup, and scolding Gible for repeatedly hitting Piplup.
** Ash's [[SugarAndIcePersonality Snivy]] fills the role for the Unova gang. She's always watching out for them but would rather stay out of pointless squabbles. She also developed a rivalry with Iris' Emolga because of a [[GoodBadGirl personality clash.]]
** In ''X and Y'', Serena fulfills this role for Bonnie and later Mairin.
* In ''Anime/PokemonAdventures'', Blue probably sees herself as Silver's older sister-type figure (though shippers say that Silver feels something a ''little'' bit more for her). She also occasionally looks out for Yellow.
* Kaya, [[spoiler:more specifically, her alter ego Nagato-sensei,]] in ''Mugen Densetsu Takamagahara: Dream Saga''.
* ''LightNovel/ScrappedPrincess'': While Pacifica looks to both her adopted siblings for protection, Racquel is the one she turns to when needs someone to confide in. At one point, she even tells Racquel that she had hoped to be as good a big sister to Cz[[note]]who was revealed to be a Peacemaker and reverted to her true form against her will, by Styer[[/note]] as Racquel was to her and Shannon, who shares Pacifica's sentiment. Near the end, [[ManlyTears when he finally breaks down in tears]][[note]]after returning from the final battle with the Peacemakers, with Pacifica [[BackFromTheDead having come back to life]][[/note]], Racquel provides him with a shoulder to cry on.
* Michelle Cheung, the eldest of the three Paper Sisters from ''[[Anime/ReadOrDie Read or Dream/R.O.D The TV]]''.
* The Outer Senshi in ''Franchise/SailorMoon'': Haruka Tenoh (Sailor Uranus), Michiru Kaioh (Sailor Neptune), and Setsuna Meioh (Sailor Pluto).
* Kuwabara Shizuru in ''Manga/YuYuHakusho'', actually Kuwabara Kazuma's older sister, who seems to consider it her job to keep the younger (acting?) girls safe and upbeat. Urameshi Atsuko kinda shifts between this in the manga... she had Yuusuke when she was about ''fourteen'' (Yuusuke's same age), after all.
* Triela fills this role in ''Manga/GunslingerGirl'', despite not being related to any of the other protagonists. She seems a bit older than the other girls. SixthRanger Petra, despite being the most teenage, does ''not'' apply here since she doesn't even interact with the others.
* Technically she's the ''cousin'' of [[TroubledButCute Ryoma Echizen]], but otherwise Nanako Meino fits the trope to a T in ''Manga/ThePrinceOfTennis''. And there's also Fuji's [[HelloNurse EXTREMELY hot sister]] Yumiko.
* Sakaki from ''Manga/AzumangaDaioh'' is pretty much this, being quite protective of [[TheCutie Chiyo]][[CheerfulChild -chan]] and earning Chiyo's admiration in return. And then there's all her in-show {{fangirl}}s.
* Yoko Littner from ''Anime/TengenToppaGurrenLagann'' becomes this after outgrowing her {{Tsundere}} stage early in the show, although she had hints of it from the beginning.
** Kamina acts as Simon's cool big ''bro'' [[note]] technically, Kamina acts as ''everyone's'' cool big bro but it's most noticeable with Simon[[/note]].
* ''Manga/BitterVirgin'' has Izumi Suwa, elder sister of Daisuke, who is considered a Cool Big Sis by Daisuke's childhood friend Yuzu Yamamoto. She also becomes such to female lead Hinako when she encourages her to fight for Daisuke's affections and becomes [[spoiler:the only person who Hinako has knowingly divulged her secrets to]]. She also earns some points for casually dismissing the flak she catches for returning to her conservative home town ''very'' pregnant with no father in sight.
* Mai Tokiha from ''Anime/MaiHiME'' who, atypically for this trope, ''is'' a {{shonen}} series lead. She jokes about Shiho's BigBrotherAttraction toward Yuuichi when they all first meet, stating that she (Mai, not Shiho) and Takumi are blood-related.
* ''Franchise/{{Gundam}}''
** Christina Sierra from ''[[Anime/MobileSuitGundam00 Gundam 00]]'' isn't the sister of either Feldt or the Gundam pilots, but treats them as if they were her siblings.
** She possibly caught that from Catherine "Cathy" Bloom, the cool big sister from ''[[Anime/MobileSuitGundamWing Gundam Wing]]''. [[spoiler:Who's confirmed by WordOfGod to be the long lost older sister of the Gundam Heavyarms's pilot, Trowa Barton]].
** And let's not forget Toniya, the DarkSkinnedBlond from ''Anime/AfterWarGundamX'', who plays this role towards Tiffa and Garrod ([[ShipperOnDeck and even ships them together]]).
* ''Anime/SuperDimensionFortressMacross''[=/=]''Anime/{{Robotech}}'': [[SassyBlackWoman Claudia]] acts as a big sister figure to Misa Hayase[=/=]Lisa Hayes, often by lending an ear when Lisa's stressed and needs to vent, and occasionally gives her relationship advice to help her get closer to Rick Hunter. Though when it comes to her fellow BridgeBunnies (Kim/Kimberly, Vanessa, and Shammy/Sammy), she's the TeamMom.
* ''Manga/{{Bleach}}'' gives us two:
** Rangiku Matsumoto. She really takes on the CoolBigSis role when she lives with Orihime, and later is this also to Momo and ''her own captain''.
** Yoruichi Shihoin. Teases the hell out of Ichigo, after abandoning cat form and [[ShamelessFanserviceGirl appearing]] [[TheTease nude]] in front of him, [[LuminescentBlush revealing]] [[PleasePutSomeClothesOn his prudishness]]. Also was the mentor of both a teenage Soifon and a teenage Byakuya. (Byakuya was even less thrilled than Ichigo by Yoruichi's antics, making Soifon the only one of the trio who adored having her as a mentor and Cool Big Sis. [[LesYay And maybe even more]]).
* Cathy Taymor and Pamela from ''Anime/KaleidoStar''. Sarah Dupont is ''both'' this and the local TeamMom.
* Natsumi Hayama from ''Manga/KodomoNoOmocha'' used to be a [[BigBrotherBully Big Sister Bully]] to her brother Akito since [[spoiler:she blamed him for their mother Koharu's DeathByChildbirth]], but becomes this after her CharacterDevelopment.
* In ''Anime/OvermanKingGainer'' after she switches sides, Adette eventually becomes this role, well after she stops sleeping. The Siberian Railroad even still calls her Big Sis while she's attacking them.
* Played for laughs with Li Syaoran's ''four'' older sisters in the first ''Manga/CardcaptorSakura'' movie. They were all very sweet and well-intentioned ... and complete {{Kawaiiko}}s.
* ''Manga/AxisPowersHetalia'' has several, actually:
** Hungary, before she "graduates" into TeamMom and marries Austria.
** In Finland's notes, Belgium is hinted to be a CoolBigSis too, but she has only had cameos so far. [[http://pics.livejournal.com/melcratch/pic/00003xx2/ Confirmed in the published manga]], so much that little!Romano gets a PrecociousCrush on her.
** Ukraine ''might'' qualify as this, but both her younger siblings Russia and Belarus are {{Yandere}}s and she's very much a ShrinkingViolet. Russia ''does'' seem to consider her as one, considering [[PetTheDog his genuine affection for her and how fondly he remembers their childhood.]]
** Vietnam tends to get this treatment in fanon, and shows shades of this in the 2011 Bloodbath when she takes charge of the girls' meeting.
* Melissa Mao from ''Lightnovel/FullMetalPanic''. She mentions the trope almost by name in ''The Second Raid'' when she confronts Sousuke about [[HeroicBSOD spacing out in the middle of a mission]]. Not to mention that Kurz calls her "Sis."
* Rin Ataka from ''Anime/{{Gasaraki}}'' is arguably one of these too, she even goes so far as to sneak off of a military base despite being detained in order to check if Yushiro is ok.
* Fasalina in ''Anime/GunXSword'' is amongst the antagonist's group, however she seems fond of newcomer Michael and if he's not being guided by The Claw, he goes to her and she teaches him. It doesn't excuse her position as a villain though, making her a rare villainous CoolBigSis.
* ''Manga/MahouSenseiNegima'' has Negi's cousin Nekane filling this role whenever she's around. Kaede, Konoka, Akira, and Chizuru all fit the bill as well. On that note, most of the 3A girls can qualify at some point or another...
* Tae Sekihara in ''Manga/RurouniKenshin'', who counsels her friend Kaoru and takes Tsubame under her wing.
* Kirino Chiba, ''Manga/BambooBlade'''s KendoTeamCaptain, is more ditzy than flirty, but is clearly remarked to be the CoolBigSis for the kendo team, which helps to keep them united. This may also make her something of a TeamMom.
* Anehara Misa in ''LightNovel/YokuWakaruGendaiMahou.''
* So far, Eva from ''Manga/{{Karneval}}'' is one to some extent, being reliable during a crisis, [[LesYay especially when Tsukumo-chan is concerned]], although the guys are pretty scared of her.
* ''LightNovel/ACertainMagicalIndex'':
** Touma apparently has a fetish for Cool Big Sis types, though he tries to keep it quiet. Kaori is the only one in his UnwantedHarem who would fit the type, and even that's a little bit of a stretch (she's the Cool Big Sis to some of his haremettes, but not to Touma).
** Fukiyose Seiri is good at depicting this image. She's also hijacked the role of ClassRepresentative on a number of occasions.
** Shizuri Mugino acts as one to the other members of Team ITEM, but she's also AxCrazy and wouldn't think twice about killing them before her HeelFaceTurn.
* Though only [[BerserkButton one year older]] than the rest of the main cast of ''Manga/HayateTheCombatButler'', Maria seems to be the holder of this title.
** While Yukiji is better known as an irresponsible HardDrinkingPartyGirl and older than most, she has shown to have this side to her, mostly to her younger sister.
* ''Anime/PuellaMagiMadokaMagica'' has Mami Tomoe who has a protective, motherly personality towards rookie magical girls. Most adaptations [[spoiler:and timelines]] show her in this relationship with one or more of them. [[spoiler:However, in one timeline she murdered TheTeam because she learned the AwfulTruth, crossed the DespairEventHorizon, and decided this was the best course of action, viewing it as a MercyKill.]]
** The SpinOff ''Manga/PuellaMagiOrikoMagica'' has Kyouko accidentally being one to Yuma. Despite Kyouko's [[{{Jerkass}} lack of morality]] it's heartwarming.
* ''Anime/{{Madlax}}''
** Elenore is this to Margaret as well as being ''MamaBear'' to her.
** Vanessa is this likewise to both Margaret and Elenore.
* In episode 16 of ''Manga/{{Nichijou}}'', Yukko befriends the Professor and becomes this. The Professor adores her and, in a manga chapter, Yukko proves more capable than Nano at dealing with her temper tantrums and a TimeSkip chapter has an adolescent Professor ecstatic on hearing Yukko is returning to Japan.
* Ayako of ''Manga/SlamDunk'' personified this trope in the early chapters, being much more outgoing then the more {{moe}} Haruko. Later on she becomes more a TeamMom.
* Nathan from ''Anime/TigerAndBunny'' is built on this trope, right down to [[StealthPun his name]] (or, as it's pronounced in Japanese, Nee-San). The fact that he's male does not diminish it in the least.
* Michiko from ''Anime/MichikoToHatchin'' eventually becomes one to Hatchin.
* ''{{Manga/Saki}}'' formerly saw her older sister Teru as this, but by the start of the series, after their parents' separation [[spoiler:and possibly a death in the family]], Teru refuses to speak to Saki or acknowledge their being related.
** Hisa, being the ClubPresident and oldest member of the Kiyosumi mahjong club, serves this role to the younger girls, albeit girls who are not related to her.
** In ''SakiShinohayuDawnOfAge'', Mafuka Kasugai, an IdolSinger and Mahjong player, is this to Hayari Mizuhara, cheering her up with a magic trick involving a mahjong tile on two occasions.
* Yomi to Kagura in ''Anime/GaReiZero''. Even after a barrage of very awful tragedies she's still a Cool Big Sis, to the bitter end.
* Aoi Kimi of ''LightNovel/HorizonInTheMiddleOfNowhere''. As the protagonist's slightly older sister, she's about the same age as most of the rest of the main cast, but definitely plays TeamMom. She's also a flamboyant pervert.
* In ''Anime/GirlsUndPanzer'', the Little Army prequel manga reveals that Nishizumi Maho, who otherwise seems like an {{Expy}} of Teru from ''{{Manga/Saki}}'', is actually quite close to her younger sister Miho, and that the [[AloofBigSister aloof behavior]] she often displays in the anime [[spoiler:is actually a jerkass demeanour brought on by having to be the ideal Nishizumi heiress, which she does so that Miho will be free to live her own way]].
** [[GLoriousMotherRussia Pravda High]]'s second-in-command [[AloofDarkHairedGirl Nonna]] has this dynamic with her direct superior [[TheNapoleon Katyusha]]. One need only look through the non-action scenes episode 9 for proof.
* In ''Manga/MagicKnightRayearth'', Presea the UltimateBlacksmith is very affectionate towards the trio despite her habit of fantasizing about DisproportionateRetribution and {{Cool And Unusual Punishment}}s. The [[AdaptationExpansion anime]] has enemy dancer Caldina act as this to Ascot. [[spoiler:In both versions, she becomes another big sister figure to the Magic Knights after her HeelFaceTurn.]]
** And in the anime, [[spoiler:Presea's AngstySurvivingTwin Sierra also plays the role. While masquerading as Presea, that is.]]
* ''LightNovel/IfHerFlagBreaks'': Kikuno is Souta's self-declared big sister, so she does sisterly things for him, such as making him lunches, giving him advice, and being a little too affectionate sometimes. She also acts like a big sister figure to the rest of the cast.
* Petra Ral from ''Manga/AttackOnTitan'' became one to Eren. She functioned as a TeamMom to Levi's squad, and was the most supportive and kind member.
* ''Anime/KillLaKill'': Satsuki Kiryuin gets this trope as a part of her [[DefrostingIceQueen character development.]] Made even more meaningful by how [[spoiler:a good part of her cold and ambitious behavior came from her swearing revenge on her AlmightyMom, Ragyo, for experimenting on Satsuki's newborn little sister ''and throwing her away for dead'' when said experiments didn't work. Said sister? ''Ryuuko'', of all people.]]
* In ''Manga/ACentaursLife'', ClassRepresentative Manami Mitami is this to her four younger siblings, [[SameSexTriplets Chigusa, Chinami, Chiho]] and Suetsumu.
** Himeno is this to her younger cousin, Shiho. Shiho herself acts as a Cool Big Sis to an even younger centaur girl from the same kindergarten, Maki.
* Creator/YoshiyukiTomino is supposedly trying to invoke this with Aida in ''Anime/GundamReconguistaInG''.
* Definitely related to above, this is very strongly invoked by Kamiki Mirai from ''Anime/GundamBuildFightersTry'', older sister of (one of the three) main character, Kamiki Sekai. Not only is she beautiful to the point of charming almost literally everyone who sees her, she is also very supportive of whatever her little brother takes interest in, be it martial arts, or toy battle. That said, when he gets himself into a police station or gets distracted away from finishing transfer student registration, she does show some stun side.
* ''Manga/IsTheOrderARabbit'''s Cocoa tries to act like one. Though it doesn't work very well on Chino, Megu seems to buy it.
* ''Anime/VariableGeo'': [[MinorLivingAlone Satomi]] is a literal and borderline tragic example, given she's been left to support herself and [[IllGirl her brother, Daisuke]], since their parents deaths, years ago. She's held two jobs to make ends meet, which includes Daisuke's medical expenses, and goes so far as to [[spoiler:submit herself to [[NebulousEvilOrganization The Jahana Group]] for experimentation, after they [[AnOfferYouCantRefuse offer to take over the costs of Daisuke's medical treatment]]]].
* ''Manga/ShinshunkiMimanOkotowari'' invokes the trope since the heroine, Asuka, ''aims'' to become this towards her recently found half-siblings Manato and Kazusa so they'll accept her in their family. Things get muddled, however, [[BrotherSisterIncest when she starts feeling attracted to Manato and he eventually reciprocates]]..
* Given the CentralTheme of family, ''Franchise/LyricalNanoha'' has a lot of examples:
** The first example in the franchise is Nanoha's older sister Miyuki.
** Nanoha described Farin, head maid of the Tsukimura family, as being one for Suzuka. Suzuka's actual sister Shinobu is probably closer to an OneeSama, but they are never shown to interact.
** Subaru Nakajima loves and admires her older sister Ginga. [[spoiler:So do Cinque, Nove, Dieci, Wendi, and presumably Thoma (if they ever continue ''Force'') once they're adopted.]]
** Alicia acted this way for Fate when the latter was trapped in a LotusEaterMachine. This relationship was carried over to the ''Manga/MagicalGirlLyricalNanohaINNOCENT'' spin-off.
** Arf was somewhere between this and ParentalSubstitute for Fate back in the first season (since Fate was in ''desperate'' need of a positive influence), even though she's technically younger.
** Amy acted as one for Fate, even before they became sister-in-laws. Lampshaded in the the third ''A's'' Sound Stage.
--->'''Chrono:''' In reality, you’re almost like Fate’s older sister.
** Vita acts as one for both Rein and Agito. The latter even calls her "Anego" which means "big sister", but it can also mean "boss".
** Caro stated in a episode of ''[=StrikerS=]'' that she's always viewed Fate as an older sister instead of a mother, [[AdoptivePeerParent probably due to the fact that there's only a 9 year difference between them]].
** Multiple girls act as this for Thoma including: all six Nakajima sisters, Signum, and Alto.
** Several of the older Numbers act as big sisters for they younger ones, more specifically: Due for Quattro, Tre for Sette, Cinque for all of the ones that make a HeelFaceTurn (especially Nove), and Sein for Wendi.
** Nove pulls double duty as both this and [[BigBrotherMentor Big Sister Mentor]] for Vivio and her friends, to the point that they name themselves Team Nakajima in her honor when they enter in the Inter-Middle Championship (despite her embarrassed protests).
** Chantez declares herself as such when she first meets Fuka since she's a sister of the Saint Church and Fuka grew up in a church run orphanage. Nothing ever really comes of it though.
* Sai in ''Manga/AngelicLayer'' is this for Misaki when the latter reaches the finals. The first thing she does when they meet is hold Misaki's hand and help her walk out to the crowd. She also helps her discover Hikaru's weakness and through Sai's backstory [[spoiler:where we find out she had a little sister who died of an illness, and was her entire reason for playing Angelic Layer]] it can be assumed she sees Misaki in the same way.
** Also in a little twist, Hatoko is like this for Misaki as well, despite being a few years younger, by constantly teaching her about Angelic Layer and helping her become a better player.
* Anastasia of ''Manga/Brave10'' becomes Isanami's sister figure after she rescues her from Date and acts as the [[GoodBadGirl Good Bad]] ActionGirl to Isanamis's wide-eyed innocent DamselInDistress. [[spoiler:[[TheMole But it's a ruse]]. Ana actually hates the concept of family-like bonds, and it was all an act, probably devised by Hanzo to eventually break Isanami.]]
* Lin ([[SpellMyNameWithAnS Rin]]) in ''Anime/SpiritedAway'' is not actually Chihiro's sister, but after a rocky start, she takes her under her wing.
* In ''Anime/KikisDeliveryService'', Kiki has a bout of insecurity and loneliness [[spoiler:when she loses her witch's powers]]. One of her friends, a young painter named Ursula, invites her to stay in her forest cottage and helps her mental block.
* Sanae Kashima takes to this role almost immediately in ''Manga/AliceAndZoroku'' in regards to Sana. Thanks to being forewarned by her grandfather, she's able to take Sana's powers in stride and be understanding about Sana's initial nervousness around her. Sanae wins Sana over in short order by doing her hair for her, making her food, and comforting Sana when traumatic memories start to overwhelm her.
* Lucoa from ''Manga/MissKobayashisDragonMaid'' acts as one to Tohru... when she isn't undercutting her dignity by acting like a creepy pedophile. Tohru used to act as one for Kanna, but their current dynamic has shades of PromotionToParent (though Kanna strictly views her as an older sister).
* While their relationship is officially that of a valet and her mistress, Hayasaka from ''Manga/KaguyaSamaLoveIsWar'' acts this way for Kaguya (even though they're the same age). Fujiwara is also this for Shirogane's younger sister, much to [[SiblingsWanted Kaguya's]] jealousy.
* Anime/ZoidsChaoticCentury: Moonbay is this to Van and Fiona, especially Fiona.
* ''Manga/{{Naruto}}'':
** Ino began as this to Sakura, protecting her from bullies and helping her to realize her potential. However, Sakura came to believe that [[AlwaysSomeoneBetter she'd always be under Ino's shadow]], and when they both started crushing on Sasuke she broke it off. After their fight in the Chuunin exams, however, they more or less mend their bonds.
** As time passes, Sakura herself evolves into one for Hinata and even to Naruto himself. ''Anime/TheLastNarutoTheMovie'' has her helping Hinata reach her affections to Naruto, and then helping Naruto recognize the depth of Hinata's love for him [[spoiler: to snap him out of his HeroicBSOD after Hinata is taken away.]]

* ''ComicBook/TheSandman'' includes Death, who is the sweetest, gentlest girl anyone could ever meet. She loves everyone, and everyone, audience included, loves her. She is by far the sanest of the Endless, and is able to provide a pragmatic perspective to her younger brother, the anguished poet Dream. Most importantly, she is extremely badass when it is called for, and is the only one of the Endless who "is bound by no rules." The ironic contrast between the kind and beautiful Death and the typical Grim Reaper archetype is deliberate and effective.
* ''ComicBook/YTheLastMan'': Yorick always thought of his sister Hero this way... [[spoiler:until she joined the Daughters of the Amazon after the {{Gendercide}} and murdered someone in front of him. He had a tough time accepting her HeelFaceTurn after that.]]
* ''ComicBook/SpiderGirl'': Mayday Parker is well on her way to be this to her baby brother Benjamin.
* After Orube in ''ComicBook/{{WITCH}}'' gets over her ArrogantKungFuGuy attitude, she becomes this to the Guardians.
* Although the timeline of events indicates Megan is actually somewhat older, her ''far'' more experienced cousin, Laura Kinney aka ComicBook/{{X 23}}, takes this role in their relationship.
** Later on, Jubilee becomes this for Laura herself.
** Laura becomes a much more literal one in ''Comicbook/AllNewWolverine'' to Gabby, a 13 year-old clone created by [[Comicbook/SpiderMan2099 Alchemax Genetics]], who [[BigSisterWorship greatly looks up to her]].
* Lucy acts this way towards Rerun a lot in the later ''ComicStrip/{{Peanuts}}'' strips, very unlike her relationship with Linus in the earlier ones. (A lot of CharacterDevelopment is probably the cause.)
* ''All New ComicBook/XFactor'': ComicBook/ScarletWitch tries to be this for her half-sister Polaris.

* ''Fanfic/ACrownOfStars'': Misato is a mix of ParentalSubstitute and this to Asuka and Shinji. In chapter 70 she calls herself this. With those exact words and capitalization.
-->'''Misato''':''“So I’ll be your Cool Big Sis instead.”''
* ''Fanfic/AdviceAndTrust'': Misato tries acting like this to her wards, taking care of them, trying to protect them and even encouraging Shinji to confess his feelings to Asuka. The line between this and ParentalSubstitute gets blurred as time goes on.
* ''Fanfic/DoingItRightThisTime'': After finding out [[spoiler:Rei is ([[AlternateCharacterInterpretation in this story]]) her mother's clone,]] Ritsuko changes completely her behaviour towards Rei, treating her like her little sister and being quite overprotective from her.
* ''FanFic/RacerAndTheGeek'' features Rainbow Dash playing this [[http://www.fimfiction.net/story/81159/racer-and-the-geek role to Scootloo.]]
* FanFic/AGrowingAffection has Yugao Uzuki serve as this to both Team Kakashi and her own team.
* ''Fanfic/TheBlackSheep'' introduces Mariella Smith-Rhodes, who wants to grow up just like big sister Johanna. Mariella is evidently a ''[[WhipItGood sjaemboek]]'' cut from the same rhinoceros hide, as she has succeeded in being selected for education at the Assassins' Guild School against heavy competition.
* In the ''WesternAnimation/RiseOfTheGuardians'' fic ''[[https://www.fanfiction.net/s/8751000/1/Guardian-of-Light Guardian of Light]]'', Jamie and Sophie have an adopted elder sibling, Helen, who is this to them both. It should be note-worthy that throughout the fandom, there are many stories in which Jamie and Sophie have an elder sister. Helen is the ''only'' one who actually cares about them, and doesn't abandon them the minute she meets Jack.
** By the same author, there's the crossover fic with ''WesternAnimation/{{Megamind}}'', called ''[[https://www.fanfiction.net/s/8772736/1/Protectors Protectors]]'', only this girl, Rikki, is Roxanne's elder sister. She's just as awesome, but not just to Roxanne; she's this to all the kids.
* In the ''Manga/MedakaBox'' fanfic ''Fanfic/WorldAsMyth'', Nabeshima to Zenkichi, and Yobuko to Onigase, at least when the former isn't being a YaoiFangirl.
* In ''Fanfic/NeonGenesisEvangelionGenocide'', Hikari says Asuka is like her bigger sister when she's trying to talk her friend into staying with her.
-->'''Asuka:''' I'm not your sister. I don't have any family. I don't need family.\\
'''Hikari:''' Do it for me then. I told you Kodama moved out, right? I need someone to talk to, you know, about girl stuff. I need someone told tell me if my outfit matches my shoes. I need someone to tell me how I could do better than being just a boring class representative. Someone I can trust.\\
'''Asuka:''' You mean you need a bigger sister\\
'''Hikari:''' Well, since you put it that way…
* ''FanFic/FacingTheFutureSeries'': Once [[spoiler:Danielle]] joins the Fenton family, Danny and Jazz both grow into this role easily.
* ''Fanfic/TheReactsverse'' has a few examples:
** ''Fanfic/WeissReacts'': Yang and Winter, as in canon, although Winter is far more of a TeamMom than her canonical counterpart.
** ''Fanfic/LucinaReacts'': Reflet and Cordelia are this to Robin, though Reflet is more mischievous.
** ''Fanfic/CorrinReacts'': Scarlet is this, as in canon, and Azura is viewed as this by Elise.
* The ''Fanfic/AftermathOfTheGames'' universe has a few examples:
** Human Cadence, like her Equestrian counterpart, is this for Sci-Twi, comforting her during her post-Friendship Games nightmares, and [[spoiler:spends a night guarding her with a baseball bat after Sci-Twi was nearly kidnapped by the Changelings]].
** In this story, the human versions of Rainbow Dash and Scootaloo are [[RelatedInTheAdaptation related to one another]], with the former regarding that as obvious.
** Princess Twilight becomes Sunset's Big Sister Best Friend Forever, after the latter [[spoiler:ascends to alicornhood and Celestia asks to be their ParentalSubstitute]].
** Sunset became this to Apple Bloom after being adopted into the Apple Family, tutoring her on her homework and even forgiving her for the Anon-A-Miss incident. WordOfGod says Sunset has this relationship with Sci-Twi, with the former helping the latter through her nightmares and providing her advice and moral support.
** [[EnthrallingSiren Adagio]], despite her flaws, deeply cares for both Aria and Sonata, [[spoiler:even willing to team up with the Rainbooms to rescue them from the Changelings]].
* Most [[Animation/{{Pucca}} Pucca]] fanfics tend to portray Pucca herself as being one to Garu's younger brother Gura, a popular UrbanLegendOfZelda character in the Pucca fandom. Those same fanfics also tend to have Garu himself be a Cool Big Bro (as well as PromotionToParent) to him as well.
* In ''Fanfic/PokemonResetBloodlines'', Pike Queen Lucy becomes this to [[spoiler: Brock's siblings, especially [[OfficialCouple after they start dating and become engaged]].]]
* In addition to the canon examples, the ''WebAnimation/{{RWBY}}''/''Literature/TheHobbit''/''Literature/TheLordOfTheRings'' FusionFic ''[[https://www.fanfiction.net/s/11852303/1/Rise-of-a-Star-Knight Rise of a Star Knight]]'' and its sequel, ''[[https://www.fanfiction.net/s/12404778/1/Knights-of-Remnant-The-Ring-of-Darkness Knights of Remnant: The Ring of Darkness]]'', gives us Jaune's older sister, [[Machinema/RedVsBlue Carolina Arc]], who [[spoiler:gave him a copy of her transcript to sneak into Beacon]], taught him how to fight and how to use his [[SuperpowerfulGenetics Star Knight powers]] after the Fall of Vale, and is the [[FourStarBadass General]] of the [[BadassArmy Sky Knights of Vale]], which, as the Star Knight of Vale, is Jaune's personal army.
* ''Fanfic/ConstantsAndVariables'': Elizabeth acts as this to Harry. She sees the appalling situation with the Dursleys and immediately takes it upon herself to take him in (despite having no employment, money or living situation to speak of at the time). She helps him learn how to use his tear powers, sticks up for him when Snape gives him a hard time, takes him on field trips and vacations throughout the multiverse and helps him with his schemes when he suspects that the school is in danger in any way.

[[folder:Films -- Animation]]
* Merida from ''WesternAnimation/{{Brave}}'' has three little brothers who think she's awesome.
* Margo in ''WesternAnimation/DespicableMe'' is this to the two younger girls, Edith and Agnes, though WordOfGod has stated that the three are not biologically related. [[spoiler:However, they legally become sisters after Gru adopts them.]]
* Tigress in ''WesternAnimation/KungFuPanda2'' to Po, if you want to disregard the [[ShipTease hints that she may be falling in love with him]].
* Played with in ''Disney/LiloAndStitch''. It seems like Nani used to fill this role for Lilo, but once she's PromotedToParent, their relationship becomes much more strained.
* Queen Elsa from ''Disney/{{Frozen}}'' used to be this to her little sister, Princess Anna, when they were young. After almost accidentally killing Anna with her powers, she all but ignored her existence and ultimately isolated herself from the world. By the end of the main events of the film, [[spoiler:they have rekindled their relationship]].
* Tadashi Hamada of ''Disney/BigHero6'' is a total CoolBigBro [[spoiler:so much so that he was deemed to TooCoolToLive by the story writers]]. His friends in the [[FanNickname Nerd Herd]] at the university follow his example, quickly becoming devoted to Hiro and looking after him [[spoiler:after Tadashi's death]].

[[folder:Films -- Live-Action]]
* ''Film/BonCopBadCop'' had a Cool ''Younger'' Sis for the strait-laced, by-the-book Ontario cop. Naturally, the chain-smoking, rulebreaking, yet oddly charismatic Quebec cop was interested.
* In the film adaptation of ''Film/TheLordOfTheRings'', Éowyn very much took on this role for Merry.
* Sweet Pea from ''Film/SuckerPunch'', who looks out for and protects her sister Rocket, as well as the rest of the group. "I'm only doing this because you'd all get killed without me."
* ''Film/TheSmurfs'' sees the Smurfs' human ally, Grace Winslow, essentially taking on this role for Smurfette, as the only other female influence Smurfette has met; in the sequel, Smurfette acquires a new 'sister' in the form of Gargamel's new creation, Vexy, with Grace musing that the relationship means that Vexy is her sister as well, prompting Vexy to wonder if this is what 'happy' feels like.
* Kitai's big sis, Ranger Senshi in ''Film/AfterEarth''.
* Tim's brother-in-law Sidney in the ''Film/ConfessionsOfA'' series, who pulls strings to get Tim a job and often works alongside him.
* ''Film/TheHungerGames'': Katniss Everdeen to Prim and Rue.
* Carla, while Madeline's nurse and old enough to be her mother, has this dynamic with her in the movie adaption of ''Film/EverythingEverything''. She allows Madeline to see Olly despite knowing Pauline would not promote this, leading to her getting fired.

* Literature/DyingEmbers: Amadahy Love has raised her brothers and cousin for the past seven years.
* [[CharlesAtlasSuperpower Raven]] becomes more and more of this as the ''Literature/HIVESeries'' goes on, particularly to Otto and Wing, [[spoiler:who are both orphaned early on.]]
* Eldest Whistler in ''Literature/ABrothersPrice''. She also doubles as an [[AloofBigBrother Aloof Big Sister]]. She leads, the others follow.
* Literature/ASongOfIceAndFire: Sixteen-year-old Margaery Tyrell is this for Tommen Baratheon. They are married for political reasons, but since Tommen is ''eight'' he is far too young to think of her as a romantic partner. However, they [[PerfectlyArrangedMarriage get along well]]: he quickly learns to love her like a big sister and even stands up for her when his mother [[EvilMatriarch Queen Cersei]] threatens her.
** 10-year-old Myrcella Baratheon was Tommen's loving big sister before she was shipped off to Dorne for her own ArrangedMarriage. In a way, this makes Margaery a ReplacementGoldfish.
** Sansa Stark, while [[spoiler:masquerading as Alayne Stone]], meets ''two'' cool older girls who play this role for her: tomboyish PluckyGirl Mya Stone (who's the bastard daughter of her father's friend Robert Baratheon) and world-wise, lively Myranda Royce.
** As a little girl, Lysa Tully used to adore her older sister Catelyn. Key words ''[[TheGloriousWarOfSisterlyRivalry used to.]]''
** Meera Reed is a cool big sister to her brother Jojen and to Bran Stark (who also has a boyish crush on her).
* Jacyl acts as one to TheHero, Lyra, in ''Literature/BlackDogs''.
* ''Literature/EvaLuna'' gives us the rare male-to-female {{transsexual}} version with Melecio, who is this in her InterGenerationalFriendship with Eva. [[spoiler:As Mimi, she keeps playing the trope towards Eva and takes it UpToEleven.]]
* ''Literature/TheBabySittersClub'':
** Kristy, Dawn, Mallory and Jessi to all their siblings.
** Janine is slowly revealed to be this, though Claudia initially doesn't see her this way.
* In ''Literature/TheHost'' Melanie and, by extension, Wanda serve as this for Jamie. They are a bit overprotective but, given the environment, it's understandable.
* Katniss Everdeen, cool enough to take her little sister [[TheCutie Prim's]] place in ''Literature/TheHungerGames''.
* The Literature/InDeath series. Peabody thinks of Dallas this way, while Dallas is impressed by Mira's grace, style and poise, to the point of her mental descriptions reaching near girl-crush levels.
* Meg is this to all her younger sisters in ''Literature/LittleWomen'', especially Jo and Amy, and Jo is also this to Beth.
* [[CombatMedic Yellowfang]] is this towards Cloudpelt in ''Literature/WarriorCats'': ''Yellowfang's Secret.''
* Nellie from ''Literature/The39Clues''.
* Lucy Pennykettle from [[Literature/{{Dragons}} The Last Dragon Chronicles]],[[spoiler:to Joseph Henry.]] Although they rarely get along, Zanna comes through as this for Lucy in times of trouble.
* Violet Baudelaire from ''Literature/ASeriesOfUnfortunateEvents'' is one to her younger siblings, Klaus and Sunny. She tends to [[PromotionToParent take on the "parent" role]] the most, and always tries to get them through tough situations.
* Subverted in the Creator/MaeveBinchy novel ''Literature/EveningClass'', when a young girl assumes her older sister Fran is this, citing the numerous things Fran has done for her since childhood--buying her school clothes, helping her with her homework, giving her "the talk", taking her on day trips to the city, arranging Italian lessons, etc. She outright says, "I just thought she was a marvelous big sister" when talking with her father--who she's just met for the first time because she's just learned that Fran is actually her ''mother''.
* In ''Literature/ProphecyOfTheSisters'', Lia is this for her disabled younger brother Henry. She remembers one incident from her childhood when she tried, albeit without success, to retrieve a toy boat he had lost in a river. When their father dies, making them full orphans, it is clear that Lia is now, in a way, PromotedToParent, as the only adult in the house is their aunt, Virginia.
* ''Literature/TheSecretGarden'': Martha, to Mary as well as literally for Dickon.
* Tonks from ''Literature/HarryPotter'' is this to Ginny and Hermione. She uses her VoluntaryShapeshifting powers to amuse them (and, similarly, shapeshifts an appearance in one scene that's specifically noted as making her look like she could be Ginny's older sister), and they seem to be quite fond of her. Hermione looks up to her because she's clever enough to have become an Auror, and Ginny gets into ShipperOnDeck mode because Bill insists on liking [[LovableAlphaBitch Fleur]] when, if he'd only toss her over and marry Tonks instead, Tonks could be Ginny's sister-in-law.
* Attractive and intelligent Melodía of ''Literature/TheDinosaurLords'' tries to be this for her younger sister Monserrat, as their father rarely notices they exist.
* ''Literature/PrideAndPrejudice'': Part of what gets Elizabeth to change her opinion of Mr. Darcy is realizing he's this to his sister Georgiana, [[PromotionToParent whom he raised after their parents died]]. Even when he's still in {{Jerkass}} mode, he speaks very fondly of her, and when she gets to Pemberley, Elizabeth finds out that he had an entire music room set up for her.

[[folder:Live-Action TV]]
* ''Series/{{Angel}}'': Fred tries to act as one to Connor. It works when he's in a good mood and she's not torturing him for going after Angel.
* In the reimagined ''Series/{{Battlestar Galactica|2003}}'', Kara Thrace is said to have filled this role for Sharon Valerii.
* In the KoreanSeries ''Series/BoysBeforeFlowers'', Joon Hee is the white Ferrari-driving older sister of Jun Pyo.
* ''Series/BuffyTheVampireSlayer'':
** Buffy originally filled this role for Dawn. However, after dying, coming back and basically abandoning her, it stopped applying for a bit. It was repaired in Season 7.
** Tara and Willow are somewhere between Cool Big Sis and HasTwoMommies towards Dawn.
** Faith, the AxCrazy man raping ShadowArchetype, became this when TheBusCameBack in season seven, primarily because she was took the potentials out to let off steam and was seen as more reasonable than Buffy.
* ''{{Series/Chuck}}'':
** Ellie is the ultimate Cool Big Sis. She practically raised her younger brother Chuck by herself after their parents left their lives, is willing to lend an understanding ear to his problems, and is just generally an awesome person.
** In the flashback, we see Morgan defending Chuck, so Chuck considers him to be his Cool Big Bro, and Awesome's pretty cool too.
* ''Series/{{Firefly}}'' has urbane, sophisticated [[HookerWithAHeartOfGold Inara]] frequently playing the more experienced Cool Big Sis to [[WrenchWench Kaylee]] - complete with hair-brushing sessions and advice on boys.
* Eun Bi from the KoreanDrama ''Series/FlowerBoyRamyunShop'' is this to Ba Wool, who admires her for being an ex-gang leader and for being the daughter of somebody he respects as well.
* Erica is this to Barry and Adam in ''Series/TheGoldbergs.''
* Referenced almost by name in C-drama ''The Holy Pearl'' between [[LadyOfWar Mu Lian]] and [[RebelliousPrincess Yu Die]].
* In ''Series/{{Pasta}}'', the older sister of Kim Sam is awesome!
* In ''Series/KamenRiderDouble'', [[spoiler:Princess Wakana]] to Philip.
* Mako's this in ''Series/SamuraiSentaiShinkenger'', much to Ryuunosuke's dismay. Additionally, Kotoha's older sister (who was meant to be Shinken Yellow [[SoapOperaDisease before getting sick]]).
** This dynamic is repeated in ''Series/PowerRangersSamurai'', with Mia (Pink Ranger), and Emily's sister, Serena (original Yellow Ranger).
* The girl of ''Series/GirlMeetsWorld'', Riley Matthews, is this to her little brother Auggie, esp. when they are in the same episode. The episode "Girl Meets Brother" is a showcase of this. This also continues in RealLife too for Riley's actress Creator/RowanBlanchard being this to Auggie's actor August Maturo and his little brother Ocean.
* ''Series/FullHouse'' had DJ Tanner (the oldest) being one of the Cool Big Sis to Stephanie (the middle child) and Michelle (the youngest) when [[TeamMom Pamela Tanner]] died of a car crash. It's like having 3 Cool Big Sis in a family-friendly sitcom instead of 1 or 2.
** In ''Series/FullerHouse'', the daughter of DJ's best friend Kimmy, Ramona, serves as one to DJ's two younger boys, Max and Tommy, even though none of them are related.
* ''Series/LivAndMaddie'' has Maddie be this to her brother Parker. Liv tries her best to do so to Parker in "Sleep-A-Rooney" but has trouble being one (due to her being away from him since he was 6) and later succeeds.
* ''Series/AustinAndAlly'': Ally Dawson shows signs of being this to [[CheerfulChild Nelson]], despite being her student.
* In ''Series/TheVampireDiaries'', Elena is one to Jeremy.
** Jenna is to her niece and nephew.
* In flashbacks on ''Series/TheWestWing'', a college age Jed Bartlett meets a young Mrs. Landingham, who says he needs a "big sister" to help guide him. She will later become his loyal but SassySecretary when he becomes President of the United States.
* Penny on the ''Series/TheBigBangTheory'' to pretty much everyone, but especially her self declared "bestie" Amy.
* ''Series/OnceUponATime'': Red seems to have developed into this for Henry, which makes sense she's his grandmother's [[HeterosexualLifePartners best friend]].
* ''Series/GossipGirl'': Serena is very protective of her brother Eric and Jenny, her boyfriend's younger sister.
* ''Series/AgentsOfSHIELD'': Almost immediately after her reveal [[OneManArmy as one of]] [[ActionGirl the good guys]] and saving her, Simmons [[TheKnightsWhoSaySquee started gushing over]] [[spoiler:Bobbi Morse]].
* ''Series/{{Sherlock}}'': Sherlock seemed to have developed this for Mary and, since she understands the fact that [[NightMareFetishist he's different]], rather than freaked out by it. Also, despite the fact she shot him, she's [[UndyingLoyalty about as loyal to John as Sherlock is, since they're both willing to do anything for him. Anything, really.]] And Sherlock [[ShipperOnDeck seems to be a Mary/John shipper.]]
** Sherlock and Molly seem to think John's pretty cool, and consider him like a big brother, and, after Molly helped Sherlock fake his death, Sherlock consider her to be a cool little sis. And John considers Molly to be a cool little sis, and Sherlock to be a cool little brother, or at least a cool friend.
* ''Series/TheFosters'': [[BigSisterInstinct Callie]] towards her little brother Jude. She eventually seems to develop into this for her foster sister Mariana as well.
* In ''Series/HowIMetYourMother'', Robin tries to be this to her younger sister Katie. She is somewhat ''is'', just not in the way she is trying to be.
* ''Series/GameOfThrones'':
** Shae to Sansa, for a while, anyway.
** Robb Stark and Jon Snow are male versions to their younger siblings, who adore them, especially Jon to Arya when he gives her Needle, her first sword.
** Jaime is a male version of this to Tyrion, especially because he is the only family member who respects Tyrion at all - he's even seen bringing Tyrion some extra prostitutes before the feast in the first episode!
** Margaery accepts her brother Loras' sexuality, cheers for him in tourneys, and comforts him after Renly's death. She also maintains this role with Sansa even after her ulterior motive is removed and uses it to influence Tommen, though given his AgeLift she at least experiments with appealing to his emerging sexuality.
** When Osha asks Meera if she's ashamed by the fact her brother is a NonActionGuy, she just laughs at the question, stating that there is no shame in wanting to protect someone. Not only that, but she obviously adores her little brother. This also crosses with shades of BigSisterInstinct.
* ''Series/{{Arrow}}'': Laurel and Sara are very close, once they repair their relationship anyway, with Laurel being very protective and nurturing towards Sara.
** While they aren't actually related, Laurel has this relationship with Thea too.

[[folder:Video Games]]
* In ''VideoGame/SamuraiWarriors4'', Lady Hayakawa is this for to the youngsters of the Hojo clan, but it is more obvious with Saburo when he is sent as a hostage to the Uesugi clan, she says she will always help him if necessary and orders Fuuma Kotaro to watch over her.
* A female PlayerCharacter can be this to Mission Vao in ''VideoGame/KnightsOfTheOldRepublic''.
* Comes up in with a couple of classes in ''VideoGame/StarWarsTheOldRepublic''. The bounty hunter to PlayfulHacker Mako and the Sith Warrior to TheGunslinger Vette (who also happens to be an Expy of Mission). With The Warrior you can even say she's like a little sister when you meet up with her old friends.
* Nathyrra plays this role to a female PlayerCharacter in ''VideoGame/NeverwinterNights: Hordes of the Underdark''.
* ''[[Franchise/ShinMegamiTenseiPersona Persona]]'':
** A particularly notable example can be found in ''VideoGame/Persona2: Innocent Sin'' with Maya Amano, a young women who's very much this to the teenage party members. In fact, she's such a Cool Big Sis that in the past, the four younger kids she played with [[spoiler:locked her in a shrine (with the exception of one of them, who was locked in with her) so she wouldn't have to move away. Of course, the shrine catches on fire and they [[NeverFoundTheBody think they've killed her]].]]
** The female protagonist in ''VideoGame/Persona3 Portable'' becomes this to Maiko and a non-romanced Ken, as you progress in their respective social links. She can even tell the former near the end of their social link that even though they'll be separated from each other, they'll still be sisters forever.
* [[VideoGame/SuperRobotWarsCompact2 Excellen Browning]] of ''VideoGame/SuperRobotWars'' is perpetually cheerful, friends with everybody (especially [[VideoGame/SuperRobotWarsAdvance Lamia Loveless]] and [[VideoGame/SuperRobotWarsCompact2 Einst Alfimi]]) and an unabashed MsFanservice. In fact, Excellen plays on this trope by having Lamia address her as "Ex-oneesama" when they first meet.
** Likewise, [[VideoGame/SuperRobotWarsOriginalGeneration Ouka Nagisa]] of The School Children is the eldest and addressed by Arado Balanga, Seolla Schweizer and Latooni Subota as their "sister".
** By ''Moon Dwellers'', Lamia's actual older sister [[VideoGame/EndlessFrontier Aschen Brodel]] comes into the fray and pretty much fits the bill... as in the sarcastic and occasionally hyperactive sister that sometimes tries to rope the more reserved Lamia into her shenanigans.
* ''Franchise/{{Suikoden}}''
** ''VideoGame/SuikodenII'': Nanami is Riou's adoptive older sister and sworn protector, but she also takes it upon herself to look after Jowy, and Pilika after she's left traumatized by the slaughter of her family and village. Jowy even [[ParentalSubstitute entrusts Nanami to continue to look after Pilika]] when he defects to the Highland Army. In that sense, she's doubles as the TeamMom.
** ''VideoGame/SuikodenV'': Princess Lymsleia has absolute faith in her personal bodyguard, [[TheGadfly Miakis]], and [[LikeBrotherAndSister cares for her greatly.]] And for all her shenanigans, Miakis thinks of Lym as though she were her kid sister. In the end, the game's epilogue states that (quote): [[LampshadeHanging "they remained as close as loving sisters."]]
* Bleu/Deis from the ''Franchise/BreathOfFire'' series is somewhat of a Cool Big Sis to the party, most notably in ''VideoGame/BreathOfFireIII'' and ''VideoGame/BreathOfFireIV''. She guides and gives hints to Ryu and his party, and is definitely the most... erm... endowed woman in the party. Interestingly enough, Ryu ''does'' express romantic interest in her (pretty much the most you'll ever see him express towards anyone, considering he's a SilentProtagonist) in 3, sort of culminating in a [[PrecociousCrush little kiddy crush]]. Probably has to do with how he saw her [[BigBouncyBreasts full front]], [[NakedOnArrival completely naked and up close]].
* Teased with ''VideoGame/GrandiaIII''. Everything you've seen indicates Miranda is a CoolBigSis, until it's revealed she's a mother. Her personality, however, fits this trope.
* Letty Whiterock of ''[[VideoGame/{{Touhou}} Perfect Cherry Blossom]]'' is one of these for the [[TheDitz ditzy]] [[AnIcePerson ice fairy]] Cirno.
** One thing that not many people catch is that being Cool Big Sis is an implicit part of [[PerkyGoth Kagiyama Hina]]'s hat. She's a specific kind of god of misfortune, in that she covers the festival where people "put" misfortune inside paper dolls and cast them down the river. These paper dolls are known as "big sister dolls".
** After ''Undefined Flying Object'', fanworks seem to also make out Byakuren Hijiri to be half this trope and half AllLovingHero in equal helpings -- with the sis-dom particularly pointed towards [[BattleButler Shou Toramaru]] and [[EldritchAbomination Nue Houjuu]]
* Mia Fey from ''VisualNovel/PhoenixWrightAceAttorney'' to her sister Maya but also to Phoenix.
** Being level-headed, mature and clever she is always there to help and guide them[[spoiler:even after her death]]
** The younger version of Mia in ''Trials and Tribulations'' has similar motions like Phoenix which shows the strong influence she has on her protegé
** Also Lana Skye to Ema Skye - in fact Mia and Lana bear many similarities. Both are highly capable and have younger sisters who have helped Phoenix in his cases and both wear scarves tied around their neck in a similar fashion.
* ''VideoGame/FireEmblem'':
** Annand/Mahnya from ''VideoGame/FireEmblemGenealogyOfTheHolyWar'' is regarded as this by her sister Erinys/Ferry.
** Lyn from ''VideoGame/FireEmblemTheBlazingBlade'', especially to Florina ([[LesYay if not more]]), Nils and Ninian [[spoiler:(even when they're technically ''much'' older than she is, though to be fair we don't learn that until almost the end of the game]].
** Cecilia from ''VideoGame/FireEmblemTheBindingBlade'' is something between this and TheMentor for Roy and Lilina, being the one who taught them how to fight.
** ''VideoGame/FireEmblemTheSacredStones'': In support conversations, Tana outright admits that she sees Syrene as this. Syrene's actual sister, Vanessa, seems to look up to her a lot, too.
** Lucina comes off as this towards the other [[spoiler:future children]] in ''VideoGame/FireEmblemAwakening'', especially towards Cynthia. Sumia seems to view Cordelia as this as well, though the two are roughly the same age.
** Camilla from ''VideoGame/FireEmblemFates'' comes off this way towards her Nohrian siblings, ''especially'' in Elise's eyes (who idolizes her enough that she put purple highlights in her hair to match Camilla). Scarlet also has some CoolBigSis vibes with Corrin in their supports and ''Revelation'' interactions, though to a lesser degree than Camilla.
*** Subverted by Hinoka: she loves her younger siblings a lot and that's ''not'' for discussion, but she became so focused on training and getting ready to rescue the Avatar that [[AloofBigSister she heavily neglected Takumi and Sakura's emotional needs]] and her supports with them [[MyGodWhatHaveIDone are all about her realizing it]]. i.e, in her supports with Takumi she's horrified when he tells her that he thinks she and the others be better off without him, and she has to pretty much yell at him that his death would break her. Plus she had no idea about Sakura's glaring self-esteem problems and, when Sakura explains herself, is genuinely stunned and then explains that they're NotSoDifferent.
* [[TheHero Rosalyn]] from ''VideoGame/{{Okage}}'': Shadow King is this to [[SupportingProtagonist Ari]], his little sister Annie, and possibly [[TheDitz Linda]]. If you're not one of these people, chances are if you're part of the rest of the group, she's going to be short-tempered with you.
%%* Lightning from ''VideoGame/FinalFantasyXIII'', most evident toward Hope.
* In ''Franchise/MassEffect'' a female [[PlayerCharacter Shepard]] can be this to [[WrenchWench Tali]] to the point where in the second game she seems to have something of a [[EvenTheGirlsWantHer crush]] on the Commander. She's also something like this to [[CowboyCop Garrus]] during the first game. Shepard's role as the team's LivingEmotionalCrutch does seem to put him/her in this position a lot.
* ''Franchise/DragonAge'':
** Regardless of which one is actually older, a female Warden in ''VideoGame/DragonAgeOrigins'' can have this sort of dynamic with Morrigan, or with a non-romanced Leliana, Zevran, and/or Alistair.
** Isabela acts like this towards Merrill and Bethany in ''VideoGame/DragonAgeII'', especially the former. Whenever Fenris or Anders would be ragging on Merrill for her use of BloodMagic, Isabela just tries to comfort her and asks if it's what she really wants. Party banter between them involves offering to teach Merrill about body-shots and trying to get Bethany a night at the local brothel. If the PC romances Merrill, Isabela gives him/her the IfYouEverDoAnythingToHurtHer speech, threatening a male PC with ''castration''.
*** If Hawke is female, this is implied to be her relationship with Bethany. If Hawke is a mage (and Bethany therefore dies in the prologue), Bethany's character information states that she idolized her big sister. If Bethany survives the prologue, most dialogue options between the sisters reinforce the idea that this is their relationship.
*** Bethany herself gets a turn at being a CoolBigSis if she survives the prologue and is later [[spoiler:sent to the Circle]]. A letter she writes to her sibling says that she's teaching younger mages, and one of them in particular looks up to her in this manner.
** ''VideoGame/DragonAgeInquisition'' makes Leliana perhaps the coolest version of this trope in Thedas towards Josephine, whom she considers one of her few true friends. This can actually cause problems where her methods of protecting the pacifist Josephine is violence, not to mention scare off anyone interested romantically. To Leliana, upsetting Josephine is well worth the price if it keeps her from getting hurt.
* In ''VideoGame/NieR'', [[JerkWithAHeartOfGold Kaine]] plays this role to [[TheWoobie Emil]], in that she can relate to the idea of having a part of their body that makes them hated (Emil has {{Magical Eye}}s while Kaine is a {{Hermaphrodite}} possessed by a Shade) and tells him to never be ashamed of himself for what he is.
* Esperia seems to have this role among the spirits in ''VisualNovel/EienNoAselia''. Halion really tries, but she's a bit too slow and strange to pull it off.
* In the ''Franchise/StreetFighter'' 'verse there are two:
** The arcade version of ''Super VideoGame/StreetFighterIV'' portrays [[VideoGame/StreetFighterII Chun-Li]] in this light towards [[VideoGame/StreetFighterIII Yun and Yang Lee]]. It should be noted that given the connections between [[VideoGame/StreetFighter Gen, Lee,]] Chun-Li's father, Chun-Li, and the Lee Bros. and the likening of a martial arts instructor/master to that of a father figure, Chun-Li is more or less their ''actual'' martial arts "big sister".
** [[VideoGame/StreetFighterII Cammy]] can also be seen as this towards her fellow [[VideoGame/StreetFighterAlpha Dolls]]. Particularly, ''SSFIV'' has Cammy attempting to go all [[MamaBear Sister Cub]] on newcomer Juri for savagely attacking and hospitalizing them, not to mention looking after a recovering Juni in her ending. [[spoiler:And in ''Ultra'', she's willing ''even to return to Bison's side'' if this means she can save the life of Decapre, the Doll that's actually her ''clone'' and the one who's been more physically/mentally/emotionally damaged.]]
%%Explain * In ''VideoGame/TalesOfVesperia'', [[BoobsOfSteel Judith]] acts as one to the group especially Estelle and Karol.
* In ''VideoGame/FatalFury: Mark of the Wolves'', Mai Shiranui is said to be this to Hokutomaru, who refers to her "Mai-neechan" ("Big Sis Mai").
* ''VideoGame/TheKingOfFighters'' has two example between [[VideoGame/ArtOfFighting King]] and Chizuru Kagura.
** Many of the younger female fighters admire [[{{bifauxnen}} King]] [[CulturedBadass for her style]] [[LadyofWar and sophistication]], which is why she usually serves as the captain of the [[AmazonBrigade All Womens Team.]] [[GenkiGirl Yuri]], in particular, wants to make it official, [[ShipperOnDeck by encouraging King to hook up with her older brother, Ryo.]]
** Chizuru fills this role where Shingo, Yuki, Kyo and Iori are concerned, albeit begrudgingly in the latter's case. Kyo even mentions how [[TeamMom she always seems to look after them]], during one of his conversations with [[VideoGame/FatalFury Terry Bogard]] in the ''Sky Stage'' games. She's also the only one King has ''ever'' deferred leadership of the All Womens Team to, implying she may regard Chizuru this way as well.
* ''[[VideoGame/AdvancedVariableGeo Advanced V.G.]]'':
** Satomi's a literal example, to [[IllGirl her kid brother, Daisuke]], because she's had [[MinorLivingAlone support them on her own]], ever since their parents died. In her second ending, she wins the prize money she needs for her brother's treatment and [[http://www.youtube.com/watch?v=5LCvRng9iPw he makes a full recovery.]]
** Whereas Yuka is Tamao's role model, so she [[SpiritedCompetitor strives to become just like her.]] Tamao affectionately refers to Yuka as, "sempai" and joined the tournament [[http://www.youtube.com/watch?v=21x4eowrKkk for the chance to finally meet her.]]
* ''VideoGame/FinalFantasyX'': Mid-way through the story, Rikku seems to view Lulu this way; Yuna is implied to have had a more [[ParentalSubstitute mother-daughter]] relationship with her instead.
* ''VideoGame/SoulCalibur'': [[{{Tomboy}} Seong Mina]] is Yun Seong's "big sister" figure and [[SexyMentor his mentor]] between parts ''II and IV'', where she takes it upon herself to stop him from pursuing Soul Edge, before it's too late. But, since he won't listen to her, she's decided to [[ToughLove knock some sense into him]] and [[http://www.youtube.com/watch?v=5MzaVxopQEw march him straight back to her father's dojo.]]
** In ''[[VideoGame/SoulSeries Soul Calibur V]]'' Ivy was viewed either this way or as a surrogate mother by the younger warriors who were introduced in that game.
* Posthumously, Ada Clover from ''VideoGame/BlazBlue'', whom her little brother Carl described to be so kind, caring and compassionate that he seriously adored her. Obviously, when she had her soul plucked out by their father Relius (callously, no less) into the Nox Nyctores Nirvana, Carl swears revenge and eternal hatred to Relius.
** Also from the same game, and playable one, Litchi Faye-Ling generally acts as a big sister figure to many of the younger ones, with her teaching Taokaka the ropes, generally humors with Noel when they meet and Noel certainly appreciates her (... or [[ACupAngst being jealous at her boobies]]), and she was exceptionally kind and caring to the aforementioned Carl that she secretly wants a little brother like him, and Carl adores her so much that he sees parts of his sister residing on her. [[spoiler:This could be either a subversion or a double subversion, the former because Litchi's Cool Big Sis attitude hides her massive emotional baggage about her grief and guilt about losing her friend and her taking on an ImpossibleTask to FindTheCure, to the point of being forced to join the main bad guys and never telling anyone else her problem, thus damaging her Cool Big Sis credentials (Noel was particularly devastated when she learns her new allegiance and actions, though Carl decides to try and help her). The double-subversion is that regardless of the baggage, the caring, sisterly attitude was truly genuine on Litchi's part if the situation was not that severe.]]
* From ''VideoGame/AgarestSenki 2'', Fiona sees the {{Love Interest}}s from the first generation this way. She thinks the world of them and wants to be as good a healer as [[ShrinkingViolet Aina]] and says she's a great teacher, thinks [[BarefistedMonk Felenne]] is an awesome badass and squees at the fact that [[RoyalsWhoActuallyDoSomething Victoria]] is both a princess and a warrior. She even states she wants to grow up to be like them.
* In VideoGame/TalesOfVesperia, Judith, after warming up to her teammates, becomes one for the party. She is usually bright in tone, is very reliable, and acts supportively towards her teammates, especially Karol.
* In ''VideoGame/{{Roommates}}'', [[CuteBookworm Anne]]'s relationship with both [[GranolaGirl Sally]] and [[HardDrinkingPartyGirl Isabella]] has shades of this at first, as she's the [[ShrinkingViolet shy]] CountryMouse and both of them have a little more life experience than her.
* You can play this in ''Franchise/BaldursGate'' to Imeon, particularly in [[VideoGame/BaldursGateII the second game]], but to an extent in [[VideoGame/BaldursGate the first one]]. The second game adds Aerie who basically thinks you're the best thing ever.
* This is of the new villager personality types in ''VideoGame/AnimalCrossing: New Leaf'', officially referred to as "Uchi"[[note]]"big sister"[[/note]]. Uchi villagers are blunt and tomboyish, but are also very protective of characters they've befriended. They'll even give you medicine if you get stung by bees!
* ''Franchise/CrashBandicoot'' probably isn't [[IdiotHero the first person you'd expect]] [[CloudCuckooLander to be big brother material]], but the guy has saved the day numerous times over and is literate with countless forms of combat, weaponry and transportation, all of which is only concentrated when it involves his baby sister Coco. Crash follows her every command and desire, and when the villains target her, [[BerserkButton he becomes a very different person]].
* In ''VideoGame/{{Drakan}}'', Rynn has this in ''spades'' with her younger brother Delon. She also appears to have been [[PromotedToParent promoted to parent]] seeing as their parents are never seen or mentioned. This is a sister that was willing to awaken a dragon and [[BondCreatures bond]] [[{{Synchronization}} with]] him to save her brother. [[spoiler:Sadly, though, it doesn't work out in the end, and Delon dies]].
* ''VideoGame/MassEffectAndromeda'' brings us Sidera and Vetra Nyx who have this relationship. Vetra is very much the [[MamaBear Surrogate Mama Bear]] and extremely protective of Sidera. She is occasionally frustrated from raising her. Sid admires the hell out of Vetra to the point that she [[spoiler:uses Vetra's identity to do random good deeds)]]. During Vetra's loyalty mission, their relationship matures a bit, with Vetra realizing Sidera may be a bit green, but she can't be sheltered forever. Vetra becomes more of a mentor and fits this trope better. Of course, neither look it, as both are [[https://s-media-cache-ak0.pinimg.com/originals/8c/ba/0b/8cba0be12486b2cbc9fcf539efafe67b.png turians]].
** Ryder can be this if you play the female twin.

[[folder:Visual Novels]]
* Charlotte is a cool big sis for both Angie and Mary Clarissa in ''VisualNovel/ShikkokuNoSharnoth''. However, the short voice over at the beginning of every chapter reveals that when they were children, Mary actually played this role for Charlotte instead.
* Physically older? Check. More mature than everyone else, protagonist included? Check. An actual leader for TheSquad? Check. [[BoobsOfSteel Huge tracts of land]]? Check. Meet Forte Stollen from Videogame/GalaxyAngel.
* Kurugaya from ''VisualNovel/LittleBusters''. She actually encourages the girls from the group to call her "Anego" or "Onee-san".
* Akira Satou from ''VisualNovel/KatawaShoujo'', with the bonus of being Lilly's actual older sister.
* Amane in ''VisualNovel/GrisaiaNoKajitsu'' was the first cool big sis in the story after more or less adopting Makina and attempting to keep some kind of normal human reasoning in operation for the girl. In ''VisualNovel/GrisaiaNoRakuen'' we get another with the Thanatos computer system, which Makina and Sachi instantly decide is their older sister, much to its confusion. It copes with that better than being called Tanako by Michiru, though.
* ''VisualNovel/MajiDeWatashiNiKoishinasai'' is absolutely full of them, more so as time passes. First there was just mainish heroine Momoyo who basically signed a contract with Yamato to make him her younger brother. Chris also has an older sister figure with Margit, who spoils her but is rather harsh to everyone else. In the Agave route Tatsuko seems to think she's one but... [[TheDitz not so much.]] ''S'' adds a handful more like Benkei and Takae. For the most part, these kinds of girls are most common because they're the protagonist's [[HasAType type.]] He likes older girls and they all seem to want to treat him like their little brother or hang out with him at least if they happen to be the same age but still the right character type.
* Noan starts out bullying Setsuna in ''VisualNovel/ShinyDays'' but as time goes on and Setsuna stops being TheLoad at work, she generally starts treating her nicer and starts offering some practical advice.
* Kyou Fujibayashi from ''VisualNovel/{{CLANNAD}}'' to her twin sister Ryou.

[[folder:Web Comics]]
* Yuri Zahard from ''Webcomic/TowerOfGod'', who appears out of curiosity when an Irregular appears, takes a liking to him and gives him a weapon that he really fricking needs. The younger characters, which would theoretically apply to everybody in the main cast since she is 618 years old, but especially Androssi and Baam, refer to her as noona and unni, the Korean honorifics for elder siblings.
* ''Webcomic/ElGoonishShive'' has Diane, [[LovableAlphaBitch the Queen Bee of Moperville South]] who is somewhere between this and OneeSama (EGS had thick anime roots before these girls) for Rhoda -- unusual in that they are in the same class, but Diane is about a head taller and more mature, so she comes across [[http://www.egscomics.com/?date=2008-02-01 as senior]] and [[http://www.egscomics.com/?date=2010-12-27 acts]] very [[http://www.egscomics.com/?date=2011-11-24 protectively]] toward "her puppy" who is tiny and [[ShrinkingViolet feels even smaller]].
* Amethyst Lashiec from ''Webcomic/HeartCore'' is like this, both to her actual younger sister Sukina, and to her sidekick Lutz.
* ''Webcomic/MagickChicks'': As the [[LovableAlphaBitch 'Big Girl on Campus']], Faith is greatly admired by the student body at [[AllGirlSchool Artemis Academy]] for [[StudentCouncilPresident her leadership ability]], and because they know [[http://www.magickchicks.com/strips-mc/only_playing she'll]] [[http://www.magickchicks.com/strips-mc/she_looks_out_for_us protect them.]]
* ''Webcomic/{{Misfile}}'': Once she lightens up after [[spoiler:Rumisiel exorcises her dead older sister's vengeful spirit]], "Kamikaze" Kate becomes one of these, ''insisting'' on making Ash her "little sister" (even though Ash is still terrified of her). Since Ash is an involuntary GenderBender who is absolutely horrified at the thought of remaining ''anybody's'' sister this works more as a deconstruction than anything else.
%%Explain * ''Webcomic/OwMySanity'' [[http://owmysanity.comicgenesis.com/d/20100809.html literally introduces this character]] as the CoolBigSis.
* Dora of ''Webcomic/QuestionableContent'' had this sort of relationship with Faye and Marten, until she hooked up with the latter.
** Since Dora ''is'' a few years older than either, [[DeadpanSnarker Faye]] made a point of humming "MrsRobinson" after the hook-up.
** Faye is this towards Sam, teaching her to weld and make mixed drinks.
* Nique to Criminy in ''Webcomic/{{Sinfest}}'', though its more along the lines of Nique considering him to be like a [[BigSisterInstinct little brother]]. She can be very protective of him, something Fuchsia found out early in her romance arc.
%% * Rhea of ''Webcomic/SlightlyDamned'' is this way to both Buwaro and Kieri.
* During the "Phoenix Rising" arc of ''Webcomic/SluggyFreelance'', Oasis takes on this role to Katie. Since Oasis is a semi-psychotic assassin/vigilante with an AllCrimesAreEqual attitude, this ''really'' freaks out Katie's mom.
* {{Subverted|Trope}} in ''Webcomic/StickyDillyBuns''. At first glance, Amber might seem to have most of the qualifications to play the part in relation to her actual younger sister Ruby. But Ruby despises her for her [[HookerWithAHeartOfGold past career as a porn star]] (which Ruby discovered in a traumatic fashion), thinks that Amber benefits from ParentalFavoritism, really doesn't want to be living with her, and is generally unwilling to ask or take her advice on anything. Whether Amber can grow into this role as Ruby gains a more nuanced viewpoint remains to be seen.
* ''{{Webcomic/Homestuck}}'': [[TeamMom Porrim]] is this to Kanaya. Kanaya is initially intimidated by her, and hesitant to talk to her. When they finally do meet, you hear the tail end of their conversation, where Porrim has taught her more about her biology and how to control her powers, and telling Kanaya she's proud of her for what she's accomplished as well as wishing her luck on her quest.
** Kanaya herself tries to be this, but everyone besides Karkat finds her more meddlesome than helpful.
%%* Delia from ''Webcomic/{{Cloudscratcher}}'' is an adoptive one to Felix.
* In ''Webcomic/{{Rhapsodies}}'' Tara, [[http://rhapsodies.wpmorse.com/comic/10222013/ the older Fitzpatrick sister]], used to get off on this quite a bit… along with being [[http://rhapsodies.wpmorse.com/comic/cool-big-sis/ a bad influence.]]
* Eloria Kierobrung from ''Webcomic/WhiteDarkLife'' is, while violent and destructive, very caring for her younger brother Luka([[JerkWithAHeartOfGold and most children as a whole]]), having [[PromotedToParent practically raised him]] thanks to their father being very aloof to them. [[spoiler:This doesn't mean that She is above almost killing her brother in a blind rage when he was chosen as inheritor of the family name, though [[MyGodWhatHaveIDone she seriously regrets it]]]].
* Da-Jeong from ''Webcomic/TheFriendlyWinter'' is a few years older than Min-Seong. She acts like a cool, older sister figure to Min-Seong, though due to a thyroid condition she's ''way'' [[HugeGuyTinyGirl smaller than him]]. It's suggested they might literally become siblings if [[RomancingTheWidow their parents hook up]].

[[folder:Web Animation]]
* ''WebAnimation/{{RWBY}}'': Yang Xiao Long and Winter Schnee. Of special note is that both are {{foil}}s to one another.
** Yang is this to Ruby. She actually used to read bedtime stories to her every night when they were younger. Slightly tragic example considering she kind of had to become one, and fast, [[MissingMom due to certain circumstances]]. [[TeamMom Yang is this to her other team-mates as well, to a lesser extent]]. She's the one who, [[AngerBornOfWorry in her own special way]], talks Blake out of her HeroicRROD. In fact, both Yang and Ruby have been hit by the MissingMom trope. Yang's mother left when she was a baby. Her father ended up marrying Ruby's mom (their other teammate), but she disappeared while on a mission when they were very young. Yang was pretty much forced to pick up the mantle for her younger half-sister.
** For another family, [[DefrostingIceQueen Weiss Schnee]] effectively worships Winter, her older sister. While the latter is fairly callous and aloof (even [[DopeSlap dope-slapping Weiss]] when she doesn't give a straight answer to her question of "How have you been?"), she genuinely cares about Weiss' wellbeing, and is even shown having tea with her and teaching her some advanced [[InstantRunes glyph]] techniques. However, the callousness and DopeSlap are both justified since Winter is a member of Atlas' military, and Weiss misinterpreted Winter's question. Winter asked "How have you been?", as in "How are you doing Weiss", whereas Weiss proceeded to state things about her grades.
* ''WebAnimation/DSBTInsaniT'': Whitney is towards her younger brother Bill, although their relationship isn't explored as deeply as her's and Dave's.

[[folder:Web Original]]
* ''Literature/IlivaisX'' has Mille, who's a more HotBlooded variant of this. Unfortunately, she has the impression that one-night stands are the epitome of romance, and to that end her reputation of sleeping around heavily is known more than being kind and compassionate. Her only real friends are people who she ended up having to see and interact often with regardless of what she did with them, and she eventually winds up in a relationship with the resident [[BrokenBird broken]] TokenMiniMoe protagonist instead of the usual archetypes present.
* ''WebOriginal/FalloutIsDragons'' has an interesting case of mutual Cool Big Sis with Aurelia, the magically aged up dragon, and Flotsam, the bomb-toting pegasus filly.
* Rob Walker is this to Creator/DougWalker.

[[folder:Western Animation]]
* Marceline has sometimes acted as a big sister figure toward Finn in ''WesternAnimation/AdventureTime''.
%%* Suzie Chan from ''WesternAnimation/TheAmazingChanAndTheChanClan''. Henry is her SpearCounterpart.
* ''WesternAnimation/AvatarTheLastAirbender'': To some extent, Mai to Azula and Ty Lee. She's a year older than them and fits the aloof, snarky profile. Also, Katara to Toph, when they're not fighting or annoying each other.
* Korra from ''WesternAnimation/TheLegendOfKorra'' is adored by all of Tenzin's children, and Ikki and Meelo often imitate her to their father's dismay (though it's made all the more amusing since Korra is the reincarnation of their ''grandfather'').
%%* Daisy Dingo from ''WesternAnimation/BlinkyBill''.
* Yumi Ishiyama from ''WesternAnimation/CodeLyoko''. Johnny sure thinks that Hiroki has a Cool Big Sis.
* Jazmine "Jazz" Fenton in ''WesternAnimation/DannyPhantom'' becomes this after the season 1 episode 'My Brother's Keeper'.
* [[WesternAnimation/{{Doug}} Doug's]] older sister Judy was both this and a BrattyTeenageDaughter at the same time. Judy is ostensibly considered one of the main antagonists of the series yet she gets plenty of heartwarming scenes of Doug, which is most likely the end result of her gaining new respect for him after he willingly gave back a large amount of cash to the old woman who lost it, even though the money was now legally Doug's.
* Frankie acts as one to Mac in ''WesternAnimation/FostersHomeForImaginaryFriends'' to the point where people unfamiliar with the show have mistaken the two for siblings. Whatever the case, it's quite useful for a boy constantly bullied by his [[BigBrotherBully biological older brother]] to have someone else to look up to.
* Wendy acts as a surrogate one to Mabel in ''WesternAnimation/GravityFalls''. This is best demonstrated in "Society of the Blind Eye" where she helps Mabel talk about her "Summer Romances" problem. Subverted with her and Dipper though, namely because she sees him as an equal friend and vice versa (though Dipper sees her more than a friend.)
* ''WesternAnimation/{{Grojband}}'': Mina to Carrie, unlike Corey and Trina's relationship, they seem to get along.
* Olga Pataki, the 20-year-old sister of Helga Pataki on ''WesternAnimation/HeyArnold''. Not only does she get top grades, is a Valedictiorian, humanitarian and has her own trophy room, but she's gorgeous and tends to steal the lime light at any given second. Everyone adores her... except her sister. Their parents even love her more than Helga.
** Not to mention that, despite having a good heart, poor Olga has ''terrible'' problems of her own. The fact that [[StageMom the Pataki parents]] dote on her so much has caused Olga to become a StepfordSmiler who collapses in tears at the slightest evidence that something may go wrong. As a result, while she plays this role to Lila and others who are outside the family, she and Helga are pretty distant -- and sometimes Helga comes off as more mentally strong than Olga does.
* Jerrica Benton of ''WesternAnimation/{{Jem}}'' plays this role for the kids at her orphanage and to her blood sister Kimber; the rest of the band are downplayed but present examples as well.
* Flash from ''WesternAnimation/JusticeLeague Unlimited'' considers Hawkgirl as one of these. In his words:
-->"She loves me. She's like the big sister I never had. Only, y'know, short."
* WesternAnimation/KimPossible, actually the eponymous main character of her show.
** Also, when her [[ArchEnemy nemesis]] Shego was turned good and became her friend, Kim described her "like a big sister".
* ''WesternAnimation/TheLoudHouse'':
** While Lincoln has five older sisters, it's Luna he seems to have the healthiest relationship with, and thus looks up to her.
** However, Leni seems to be a close second. Usually.
* ''WesternAnimation/MikeLuAndOg'': Mike is this to Lu and Og.
* On ''WesternAnimation/MiloMurphysLaw,'' Sara seems to have escaped the HereditaryCurse that befell her brother [[BornUnlucky Milo]], but is incredibly close to him despite the very, ''very'' high chance that his presence will destroy whatever fun they try to have together.
** Milo's old babysitter Veronica, introduced in "Secrets and Pies", has this relationship with him, insisting on personally delivering the pizza he's ordered and ruffling his hair while saying he earned the AwesomeBackpack he inherited from her.
* Stephanie is this on ''WesternAnimation/MoralOrel'', particularly to the titular character.
* Mike Chilton's older sister Capri in ''WesternAnimation/{{Motorcity}}''.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Twilight Sparkle to Spike. At times, she comes off as a [[ParentalSubstitute mother]] more than a sister though, since Spike has no separate maternal figure in Ponyville. Rainbow Dash also sees her old friend, Gilda the Griffon, as one. To her credit, Gilda ''does'' seem to care about her; the problem is that she doesn't care [[{{Jerkass}} for anyone else]]. [[spoiler:Ironically, it's revealed later that when Gilda and Rainbow Dash first met, it was the other way around--the young Gilda looked up to Rainbow Dash as one of these after the latter defended her from bullies]].
** Literal big sisters Applejack towards Apple Bloom, and [[AnAesop (eventually)]] Rarity towards Sweetie Belle. This is explicitly {{invoked}} in "[[Recap/MyLittlePonyFriendshipIsMagicS1E23TheCutieMarkChronicles The Cutie Mark Chronicles]]".
--->'''Scootaloo:''' We can start with the coolest pony in Ponyville...\\
'''Apple Bloom:''' Applejack!\\
'''Sweetie Belle:''' Rarity!
*** {{Fanon}} puts Berry Punch, Cloud Kicker, Carrot Top/Golden Harvest, and Sparkler/Amethyst Star as this to Piña Colada, Alula, Noi, and Dinky Hooves, respectively, based on them being seen together in "[[Recap/MyLittlePonyFriendshipIsMagicS2E5SisterhoovesSocial Sisterhooves Social]]", which was all about Rarity learning to be this.
** Pinkie Pie sometimes takes this role, trying to cheer up Apple Bloom or chaperoning foals on Nightmare Night.
*** And with the recent arrival of Mr. and Mrs. Cake's twin foals, Pinkie is now filling this role in a quite literal sense given that the Cakes seem to regard her as something of a foster daughter.
*** Subverted hilariously [[http://www.youtube.com/watch?v=hh2qaoGuHkI when she tries to act this way toward Fluttershy.]]
---->'''Fluttershy:''' I'm a year older than you.
** The couple whose wedding the Mane Six attend in the Season 2 finale, appropriately enough, both played this role for Twilight Sparkle when she was a foal: Shining Armor is her "B.B.B.F.F.[[note]]Big Brother, Best Friend Forever[[/note]]," while Princess Cadance was her foalsitter (and apparently, "the best foalsitter in the history of foalsitters").
** Subverted by Rainbow Dash. While the other members of the Mane Six are all pretty good with kids and fit this trope nicely, WordOfGod has revealed that the reason she wasn't given a younger sibling was because her occasional {{Jerkass}} tendencies probably wouldn't make her the best big sister. [[spoiler:But then, nearly three seasons' worth of CharacterDevelopment finally paid off in the events of "Sleepless in Ponyville," where she effectively becomes a big sister to Scootaloo!]]
*** She does still get occasional moments of this with other team mates however, especially to Fluttershy. When Gilda revealed her true colors and turned on Pinkie, she stood up for her (and all her other friends) as well.
*** All are pretty good with kids to some degree or another. Twilight is very responsible, seems to know a good deal about looking after children, and interacts very well with the kids in town, particularly the Cutie Mark Crusaders. Fluttershy doesn't have that much experience with kids, but her FriendToAllLivingThings status certainly gave her a leg up when the opportunity arose. Pinkie Pie and Applejack both seem to get along very well with kids, the former partially due to [[OneOfTheKids being similar to them]]. Rarity is a more questionable case, as the Cakes went to her ''last'' when looking for a foalsitter, even after Rainbow Dash!
** Even before ''Sisterhooves Social'', Rarity had been this to Sweetie Belle on her 5th birthday and... not what Sweetie Belle had thought in mind. Rarity entertained Sweetie Belle's guests to prevent them from leaving as they were waiting for the birthday girl to come down because Sweetie Belle was trying to look good for the birthday with dress, lipstick, and heels on. When one guest said that they don't need the absent birthday girl because of her older sister entertaining them, Rarity actually defends Sweetie Belle as she wants her birthday to go well. Unfortunately at that time, Sweetie Belle was overseeing this which made her go back to her bedroom crying and thought her sister upstaged her ''on purpose''. This was part of her [[DrivenByEnvy motivation]] in the plot of "[[Recap/MyLittlePonyFriendshipIsMagicS4E20ForWhomTheSweetieBelleToils For Whom the Sweetie Belle Toils]]" to sabotage a dress of one of Rarity's highest clients as payback for the dresses Rarity made overshadowing Sweetie Belle's play she worked hard on. It's also heavily implied that Luna, who was helping Sweetie Belle see the error of ways in her dreams, thought that way about Celestia.
** It's obvious Princess Celestia adores Luna after she gets reverted from being Nightmare Moon, and Part 1 of "The Return of Harmony" confirms they were good friends before that (sharing the Elements of Harmony). In the Season 4 premiere, a flashback shows them doing just that: sharing the Elements of Harmony, to defeat Discord together.
* DoubleSubverted with Candace in ''WesternAnimation/PhineasAndFerb''. She normally is quite the opposite, but the boys still look up to and admire her and during the show she actually perform many cool things. Indeed, Phineas points out in "Summer Belongs To You" how she's always taken part in their adventures and done so many cool things: driving monster trucks, traveling through time, becoming the Queen of Mars, and so on. To them, she is that cool.
** She could be considered this to Isabella (helping her sometimes in later seasons and special), even though they aren't actually related.
* Jen on ''WesternAnimation/{{Sixteen}}'' has a mean older sister everyone loves that she's jealous of.
* ''WesternAnimation/StarWarsTheCloneWars'': Padmé's relationship with Ahsoka seems to be like this.
** Ahsoka's relationship with the Jedi younglings in the Young Jedi story arc in the fifth season also seems to be like this, considering that she is their chaperone.
* In ''WesternAnimation/StevenUniverse'', the appearance of a gem reflects what they think of themselves. While Pearl and Garnet appear as adults, Amethyst looks to be in her late teens. While this is reflected in her rebellious behavior, it's also because she is actually quite younger than Pearl and Garnet are. Her insecurities over belonging to the Gems (namely in that [[spoiler: she was born in Earth and thus a product of the heinous operations the Homeworld Gems were doing) along with her own purpose allow her to bond more with Steven and they have a more casual reltationship. By the end of Season 3, she's also possibly the gem closest to him, despite Pearl and Garnet not lacking in important moments.
** This also slightly applies when Amethyst and Garnet [[FusionDance fuse into Sugilite]]. When she first appears in "Coach Steven" to [[ItMakesSenseInContext wreck a Gem Control Tower]], she first asks Steven if he "wants to see something cool." Steven then spends a good chunk of the episode thinking Sugilite is awesome, and wanting to be strong like her, [[TeamMom much to Pearl's disapproval]].
** This bond between Steven and Amethyst, compared to him and the other Gems is what allows them [[spoiler: to fuse to become Smokey Quartz while proving that Steven can fuse with Gems ''and'' humans (though unknown if at the same time.)]]
* Subverted with Blackfire in the ''WesternAnimation/TeenTitans'' animated series. The other Titans think she's here to hang out with her little sis and maybe even join the team, but she's actually there [[spoiler:to frame Starfire for a robbery she committed to get the authorities off her back.]] Heck, Starfire [[GenkiGirl was excited to see her]] at first and [[OhCrap didn't expect such treachery.]] This moment marked a MoralEventHorizon for Blackfire as Starfire wasn't at all happy to see her again.
* ''WesternAnimation/TotalDrama Pahkitew Island'' has [[AwesomeAussie Jasmine]] act like this to [[NiceGirl Samey]] in order to make up for where Samey's actual older sister, Amy [[BigSisterBully failed]].
** [[DefrostingIceQueen While it takes her awhile to start acting like one]], Emma from WesternAnimation/TotalDramaPresentsTheRidonculousRace is one to her younger sister Kitty.
* Arcee acts as this to Jack in ''WesternAnimation/TransformersPrime,'' shifting into MamaBear territory when he's threatened.
* ''WesternAnimation/WinxClub'': Flora to Miele (and an honorary one to Mirta), and Daphne to Bloom.
%%* Irma and Cornelia in ''WesternAnimation/{{WITCH}}''.
* ''WesternAnimation/XMenEvolution''
** This rendition of Jean Grey, also a Type B {{Tsundere}}.
** Tabitha Smith, aka Boom-Boom, ''really'' fits the bill after her CharacterDevelopment.
** Rogue to Nightcrawler, possibly; they never actually stated which of the two is older, though it seems to be Rogue.
* Miss Martian becomes Beast Boy's adopted sister in season two of ''WesternAnimation/YoungJustice''. It doesn't hurt that she was the donor when he needed a blood transfusion in the first season, or that she modeled her human appearance on his mother, an actress who played the protagonist on a show that Miss Martian adored and based her persona off of.
** Batgirl also gives off some of this air in her interactions with Robin III and Wonder Girl. She hugs Cassie after a successful mission and is usually paired with Robin for covert ops, including knocking him out of the way of attacks. When complaining about how all the other kids have mentors, Jaime includes Batgirl as one of Robin's.