Cool Big Sis
aka: Cool Big Bro
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 Alpha Bitch
(if they're not). The Shorttank girls often admire them, even when they playfully flirt with the much younger male lead and steal everyone's attention. The Shrinking Violet
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 The Big Guy
, the Team Dad
or the Big Brother Mentor
. Or maybe
, if she's persistent enough, she'll end up in an Odd Couple
with an Aloof Big Brother
or a single father. She may also evolve into a Team Mom
thanks to Character Development
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 Hard-Drinking Party Girl
, or even The Lad-ette
; if not, she'll often be a Lethal Chef
and/or Big Eater
. If older than the standard, she might be a Christmas Cake
as well. She's often a Good Bad Girl
and frequently the person who keeps the main characters in line. Sometimes she's even portrayed as the only person the protagonist(s) are truly afraid of.
This trope can apply to male characters as a lesser form of the Big Brother Mentor
. This type is more commonly applied to a level-headed Non-Action Guy
or a Nice Guy
whose main job is to be a mediator in a group or take care of the kids.
, also a sister figure but usually more ladylike, quiet and graceful, and Aloof Big Brother
, where the status causes a conflict between the (usually male) siblings.
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Anime & Manga
- Satella from Chrono Crusade 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 Student Council President from Code Geass, 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... 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.
- In One Piece, Nami and Robin tend to alternate between this and the Team Mom trope. Nami is definitely the Cool Big Sis type to both Vivi and Chopper, while to the rest of the crew, she is definitely the Team Mom. Robin is the Cool Big Sis 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 Ranma Ż, though she ends up playing the Yamato Nadeshiko so straight she becomes a parody of it, Kasumi Tend˘ is a gentle, kindhearted woman who holds the Tend˘ 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 Boke and Tsukkomi Routine. Akane Tend˘, her Tsundere little sister whom she helped raise, adores her "Kasumi-neechan" and desperately wants to be like her, but without giving up her martial arts abilities.
- Misato Katsuragi in Neon Genesis Evangelion. Or at least, she attempts to be one.
- Two aversion in 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 due to some unfortunate events during their childhood (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 AKA Naga the White Serpent did teach her some magic (per Word of God) but she also ran away after witnessing the horrifically bloody assassination of their mother. Amelia hasn't heard from her since, and (in the novels at least) misses her terribly.
- Mai Kujaku/Valentine in Yu-Gi-Oh! to Shizuka/Serenity and, to a lesser extent, Tea/Anzu.
- Aki Izayoi (Akiza in the the dub) in Yu-Gi-Oh! 5Ds fits this, generally keeping track of Rua and Ruka after she outgrows her Dark Magical Girl leanings in the beginning of the show.
- A literal example (where she's truly the character's big sister) occurs in Yu Gi Oh Zexal, with Yuma's sister Akari; given that the Biker Babe and Intrepid Reporter 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 Ah! My Goddess, 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 SHUFFLE!, who is also a Genki Girl Bokukko to boot. And she's the one who gets the guy.
- Reki in Haibane Renmei is this to all the younger characters.
- Override in Transformers Cybertron fits the type even if she is a Giant Robot (and is only a girl in the dub). She even refers to one of the humans as "little sis".
- 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 Lady of War Soledad (Saori) from Advanced Generation, who acts like a cool big sis to May and Drew.
- Zoey/Nozomi tries to act like this for Dawn/Hikari, but ends up looking like 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 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 personality clash.
- In PokÚmon Special, 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, more specifically, her alter ego Nagato-sensei, in Mugen Densetsu Takamagahara: Dream Saga.
- Scrapped Princess: 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 Cznote as Racquel was to her and Shannon, who shares Pacifica's sentiment. Near the end, when he finally breaks down in tearsnote , Racquel provides him with a shoulder to cry on.
- Michelle Cheung, the eldest of the three Paper Sisters from Read or Dream/R.O.D The TV.
- The Outer Senshi in Sailor Moon: Haruka Tenoh (Sailor Uranus), Michiru Kaioh (Sailor Neptune), and Setsuna Meioh (Sailor Pluto).
- Though she isn't older than the Inner Senshi, Minako Aino (Sailor V/Sailor Venus) is this to the other sailors in the manga, especially Usagi (Sailor Moon) due to her stellar leadership, extensive combat experience, and status as the famed Sailor V.
- Kuwabara Shizuru in YuYu Hakusho, 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 Gunslinger Girl, despite not being related to any of the other protagonists.
- Technically she's the cousin of Ryoma Echizen, but otherwise Nanako Meino fits the trope to a T in The Prince of Tennis. And there's also Fuji's EXTREMELY hot sister Yumiko.
- Sakaki from Azumanga Daioh is pretty much this, being quite protective of Chiyo-chan and earning Chiyo's admiration in return. And then there's all her in-show fangirls.
- Yoko Littner from Tengen Toppa Gurren Lagann 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.
- Bitter Virgin 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 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 Mai Hi ME who, atypically for this trope, is a shonen series lead. She jokes about Shiho's Big Brother Attraction toward Yuuichi when they all first meet, stating that she (Mai, not Shiho) and Takumi are blood-related.
- Christina Sierra from 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 Gundam Wing. Who's confirmed by Word of God to be the long lost older sister of the Gundam Heavyarms's pilot, Trowa Barton.
- And let's not forget Toniya, the Dark-Skinned Blond from After War Gundam X, who plays this role towards Tiffa and Garrod (and even ships them together).
- Claudia LaSalle (or Claudia Grant, if we go by Robotech names) from Macross.
- Bleach gives us two:
- Rangiku Matsumoto. She really takes on the Cool Big Sis 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 appearing nude in front of him, revealing 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. And maybe even more)
- Cathy Taymor and Pamela from Kaleido Star. Sarah Dupont is both this and the local Team Mom.
- Natsumi Hayama from Kodomo no Omocha used to be a Big Sister Bully to her brother Akito since she blamed him for their mother Koharu's Death by Childbirth, but becomes this after her Character Development.
- In Overman King Gainer 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 Cardcaptor Sakura movie. They were all very sweet and well-intentioned ... and complete Kawaiikos.
- Axis Powers Hetalia has several, actually:
- Melissa Mao from Full Metal Panic!. She mentions the trope almost by name in The Second Raid when she confronts Sousuke about spacing out in the middle of a mission. Not to mention that Kurz calls her "Sis."
- Rin Ataka from 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 GUNÎSWORD 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 Cool Big Sis.
- Mahou Sensei Negima! 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 Rurouni Kenshin, who counsels her friend Kaoru and takes Tsubame under her wing.
- Kirino Chiba, Bamboo Blade's Kendo Team Captain, is more ditzy than flirty, but is clearly remarked to be the Cool Big Sis for the kendo team, which helps to keep them united. This may also make her something of a Team Mom.
- Anehara Misa in Yoku Wakaru Gendai Mahou.
- So far, Eva from Karneval is one to some extent, being reliable during a crisis, especially when Tsukumo-chan is concerned, although the guys are pretty scared of her.
- A Certain Magical Index:
- Touma apparently has a fetish for Cool Big Sis types, though he tries to keep it quiet. Kaori is the only one in his Unwanted Harem 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 Class Representative on a number of occasions.
- Shizuri Mugino acts as one to the other members of Team ITEM, but she's also Ax-Crazy and wouldn't think twice about killing them before her Heel-Face Turn.
- Though only one year older than the rest of the main cast of Hayate the Combat Butler, Maria seems to be the holder of this title.
- While Yukiji is better known as an irresponsible Hard-Drinking Party Girl and older than most, she has shown to have this side to her, mostly to her younger sister.
- Puella Magi Madoka Magica has Mami Tomoe who has a protective, motherly personality towards rookie magical girls. Most adapations and timelines show her in this relationship with one or more of them. However, in one timeline she murdered The Team because she learned the Awful Truth, crossed the Despair Event Horizon, and decided this was the best course of action, viewing it as a Mercy Kill.
- Elenore is this to Margaret as well as being Mama Bear to her.
- Vanessa is this likewise to both Margaret and Elenore.
- In episode 16 of Nichijou, Yuuko befriends the Professor and becomes this.
- Ayako of Slam Dunk personified this trope in the early chapters, being much more outgoing then the more moe Haruko. Later on she becomes more a Team Mom.
- Nathan from Tiger & Bunny is built on this trope, right down to 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 Michiko to Hatchin eventually becomes one to Hatchin.
- Saki formerly saw her older sister Teru as this, but by the start of the series, after their parents' separation and possibly a death in the family, Teru refuses to speak to Saki or acknowledge their being related.
- Hisa, being the Club President and oldest member of the Kiyosumi mahjong club, serves this role to the younger girls, albeit girls who are not related to her.
- In Saki Shinohayu Dawn Of Age, Mafuka Kasugai, an Idol Singer 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 Ga-Rei Zero-. Even after a barrage of very awful tragedies she's still a Cool Big Sis, to the bitter end.
- Aoi Kimi of Kyoukai Senjou no Horizon. 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 team mom. She's also a flamboyant pervert.
- In Girls und Panzer, the Little Army prequel manga reveals that Nishizumi Maho, who otherwise seems like an Expy of Teru from Saki, is actually quite close to her younger sister Miho, and that the aloof behavior she often displays in the anime is actually a Jerk Ass Facade brought on by having to be the ideal Nishizumi heiress, which she does so that Miho will be free to live her own way.
- Pravda High's second-in-command Nonna has this dynamic with her direct superior Katyusha. One need only look through the non-action scenes episode 9 for proof.
- In Magic Knight Rayearth, Presea the Ultimate Blacksmith is very affectionate towards the trio despite her habit of fantasizing about Disproportionate Retribution and Cool And Unusual Punishments. The anime has enemy dancer Caldina act as this to Ascot. In both versions, she becomes another big sister figure to the Magic Knights after her Heel-Face Turn.
- And in the anime, Presea's Angsty Surviving Twin Sierra also plays the role. While masquerading as Presea, that is.
- Kanojo ga Flag o Oraretara: 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 Attack on Titan became one to Eren. She functioned as a Team Mom to Levi's squad, and was the most supportive and kind member.
- Kill la Kill: Satsuki Kiryuin gets this trope as a part of her character development. Made even more meaningful by how a good part of her cold and ambitious behavior came from her swearing revenge on her Almighty Mom, 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 Centaur no Nayami, Class Representative Manami Mitami is this to her four younger siblings, 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.
- Gochuumon wa Usagi desu ka?'s Cocoa tries to act like one. Though it doesn't work very well on Chino, Megu seems to buy it.
- The Sandman 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.
- Y: The Last Man: Yorick always thought of his sister Hero this way... 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 Heel-Face Turn after that.
- Spider-Girl: Mayday Parker is well on her way to be this to her baby brother Benjamin.
- After Orube in W.I.T.C.H. gets over her Arrogant Kung-Fu Guy 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 X-23, takes this role in their relationship.
- Later on, Jubilee becomes this for Laura herself.
- Lucy acts this way towards Rerun a lot in the later Peanuts strips, very unlike her relationship with Linus in the earlier ones. (A lot of Character Development is probably the cause.)
- Racer and the Geek features Rainbow Dash playing this role to Scootloo.
- A Growing Affection has Yugao Uzuki serve as this to both Team Kakashi and her own team.
- The Black Sheep introduces Mariella Smith-Rhodes, who wants to grow up just like big sister Johanna. Mariella is evidently a 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 Rise of the Guardians fic 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 Megamind, called 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 Medaka Box fanfic World As Myth, Nabeshima to Zenkichi, and Yobuko to Onigase, at least when the former isn't being a Yaoi Fangirl.
Films — Animation
- Badass Princess Merida from Brave has three little brothers who think she's awesome.
- Margo in Despicable Me is this to the two younger girls, Edith and Agnes, though Word of God has stated that the three are not biologically related. However, they legally become sisters after Gru adopts them.
- Tigress in Kung Fu Panda 2 to Po, if you want to disregard the hints that she may be falling in love with him.
- Lin (Rin) in Spirited Away is not actually Chihiro's sister, but after a rocky start, she takes her under her wing.
- In Kiki's Delivery Service, Kiki has a bout of insecurity and loneliness 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.
- In My Neighbor Totoro Satsuki is this for Mei (Hayao Miyazaki seems to like this trope).
- Played with in Lilo & Stitch. It seems like Nani used to fill this role for Lilo, but once she's Promoted To Parent, their relationship becomes much more strained.
- Queen Elsa from 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, they have rekindled their relationship.
Films — Live-Action
- Bon Cop, Bad Cop 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 The Lord of the Rings, ╔owyn very much took on this role for Merry.
- Sweet Pea from Sucker Punch, 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."
- Kitai's big sis, Ranger Senshi in After Earth.
- Eldest Whistler in A Brother's Price. She also doubles as an Aloof Big Sister. She leads, the others follow.
- A Song of Ice and Fire: 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 get along well: he quickly learns to love her like a big sister and even stands up for her when his mother 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 Arranged Marriage. In a way, this makes Margaery a Replacement Goldfish.
- Sansa Stark, while masquerading as Alayne Stone, meets two cool older girls who play this role for her: tomboyish Plucky Girl Mya Stone and world-wise, lively Myranda Royce.
- As a little girl, Lysa Tully used to adore her older sister Catelyn. Key words 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 The Hero, Lyra, in Black Dogs.
- Eva Luna gives us the rare male-to-female transsexual version with Melecio, who is this in her Inter Generational Friendship with Eva. As Mimi, she keeps playing the trope towards Eva and takes it Up to Eleven.
- In Harry Potter, Tonks is this to Hermione and Ginny.
- The Baby-Sitters Club:
- 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 The Host 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 Prim's place in The Hunger Games.
- The In Death 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 Little Women, especially Jo and Amy, and Jo is also this to Beth.
- Yellowfang is this towards Cloudpelt in Warrior Cats: Yellowfang's Secret.
- Nellie from The 39 Clues.
- Lucy Pennykettle from The Last Dragon Chronicles,to Joseph Henry. Although they rarely get along, Zanna comes through as this for Lucy in times of trouble.
- Violet Baudelaire from A Series of Unfortunate Events is one to her younger siblings, Klaus and Sunny. She tends to take on the "parent" role the most, and always tries to get them through tough situations.
- 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 Battlestar Galactica, Kara Thrace is said to have filled this role for Sharon Valerii.
- In the Korean Series Boys Before Flowers, Joon Hee is the white Ferrari-driving older sister of Jun Pyo.
- On Buffy the Vampire Slayer, 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, only to be destroyed again and still be in pretty bad shape over a year later in Season 8.
- Tara and Willow are somewhere between Cool Big Sis and Has Two Mommies towards Dawn.
- Faith, the Ax-Crazy man raping Shadow Archetype, became this when The Bus Came Back in season seven, primarily because she was took the potentials out to let off steam and was seen as more reasonable than Buffy. In season nine the other Slayers treat her as The Obiwan, Faith's reaction is they are screwed if that's the case.
- On 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.
- Firefly has urbane, sophisticated Inara frequently playing the more experienced Cool Big Sis to Kaylee - complete with hair-brushing sessions and advice on boys.
- Eun Bi from the Korean Drama Flower Boy Ramyun Shop 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.
- Referenced almost by name in C-drama The Holy Pearl between Mu Lian and Yu Die.
- In Kamen Rider Double, Princess Wakana to Philip.
- In Pasta, the older sister of Kim Sam is awesome!
- Mako's this in Samurai Sentai Shinkenger, much to Ryuunosuke's dismay. Additionally, Kotoha's older sister (who was meant to be Shinken Yellow before getting sick).
- This dynamic is repeated in Power Rangers Samurai, with Mia (Pink Ranger), and Emily's sister, Serena (original Yellow Ranger).
- Liv & Maddie 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.
- In The Vampire Diaries, Elena is one to Jeremy.
- Jenna is to her niece and nephew.
- In flashbacks on The West Wing, 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 Sassy Secretary when he becomes President of the United States.
- Penny on the Big Bang Theory to pretty much everyone, but especially her self declared "bestie" Amy.
- Once Upon a Time: Red seems to have developed into this for Henry, which makes sense she's his grandmother's best friend.
- Gossip Girl: Serena is very protective of her brother Eric and Jenny, her boyfriend's younger sister.
- A female Player Character can be this to Mission Vao in Knights of the Old Republic.
- Nathyrra plays this role to a female Player Character in Neverwinter Nights: Hordes of the Underdark.
- A particularly odd example of this trope can be found in the game Persona 2: Innocent Sin, with the character Maya Amano. It's odd because the four younger kids she played with 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 think they've killed her. And that's just the tip of the iceberg.
- Excellen Browning of Super Robot Wars is perpetually cheerful, friends with everybody (especially Lamia Loveless and Einst Alfimi) and an unabashed Ms. Fanservice. In fact, Excellen plays on this trope by having Lamia address her as "Ex-oneesama" when they first meet.
- Likewise, Ouka Nagisa of The School Children is the eldest and addressed by Arado Balanga, Seolla Schweizer and Latooni Subota as their "sister".
- Suikoden II: 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 entrusts Nanami to continue to look after Pilika when he defects to the Highland Army, which she does. In that sense, she's doubles as the Team Mom.
- Bleu/Deis from the Breath of Fire series is somewhat of a Cool Big Sis to the party, most notably in Breath of Fire III and Breath of Fire IV. 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 Silent Protagonist) in 3, sort of culminating in a little kiddy crush. Probably has to do with how he saw her full front, completely naked and up close.
- Teased with Grandia III. Everything you've seen indicates Miranda is a Cool Big Sis, until it's revealed she's a mother. Her personality, however, fits this trope.
- Letty Whiterock of Perfect Cherry Blossom is one of these for the ditzy ice fairy Cirno.
- One thing that not many people catch is that being Cool Big Sis is an implicit part of 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 All-Loving Hero in equal helpings — with the sis-dom particularly pointed towards Shou Toramaru and Nue Houjuu
- Lyn from Fire Emblem Elibe, specially to Florina (if not more, Nils and Ninian (even when they're technically much older than she is. Also Syrene, Mahnya, and Cecilia.
- 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 in Fire Emblem Awakening, specially towards Cynthia. Sumia seems to view Cordelia as this as well.
- Rosalyn from Okage: Shadow King is this to Ari, his little sister Annie, and possibly 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 Final Fantasy XIII, most evident toward Hope.
- In Mass Effect a female Shepard can be this to Tali to the point where in the second game she seems to have something of a crush on the Commander. She's also something like this to Garrus during the first game. Shepard's role as the team's Living Emotional Crutch does seem to put him/her in this position a lot.
- Isabela acts like this towards Merrill and Bethany in Dragon Age II, especially the former. Whenever Fenris / Anders would be ragging on Merrill for her use of Blood Magic, 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 If You Ever Do Anything to Hurt Her... speech, threatening a male PC with castration.
- In NieR, Kaine plays this role to Emil, in that she can relate to the idea of having a part of their body that makes them hated (Emil has Magical Eyes 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 Eien no Aselia. Halion really tries, but she's a bit too slow and strange to pull it off.
- In the Street Fighter 'verse there are two:
- The arcade version of Super Street Fighter IV portrays Chun-Li in this light towards Yun and Yang Lee. It should be noted that given the connections between 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".
- Cammy can also be seen as this towards her fellow Dolls. Particularly, SSFIV has Cammy attempting to go all Sister Cub on newcomer Juri for savagely attacking and hospitalizing them, not to mention looking after a recovering Juni in her ending.
- In Fatal Fury Mark of the Wolves, Mai Shiranui is said to be this to Hokutomaru, who refers to her "Mai-neechan" ("Big Sis Mai").
- The King of Fighters has two example between King and Chizuru.
- Final Fantasy X: Mid-way through the story, Rikku seems to view Lulu this way; Yuna is implied to have had a more mother-daughter relationship with her instead.
- Soul Calibur: Seong Mina is Yun Seong's "big sister" figure and 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 knock some sense into him and march him straight back to her father's dojo.
- In 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 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 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. 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 Impossible Task to Find the Cure, 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 Agarest Senki 2, Fiona sees the Love Interests from the first generation this way. She thinks the world of them and wants to be as good a healer as Aina and says she's a great teacher, thinks Felenne is an awesome badass and squees at the fact that Victoria is both a princess and a warrior. She even states she wants to grow up to be like them.
- In Roommates, Anne's relationship with both Sally and Isabella has shades of this at first, as she's the shy Country Mouse and both of them have a little more life experience than her.
- Charlotte is a cool big sis for both Angie and Mary Clarissa in Shikkoku No Sharnoth. 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 The Squad? Check. Huge tracts of land? Check. Meet Forte Stollen from Galaxy Angel.
- Kurugaya from Little Busters!. She actually encourages the girls from the group to call her "Anego" or "Onee-san".
- Akira Satou from Katawa Shoujo, with the bonus of being Lilly's actual older sister.
- Yuri Zahard from Tower of God, 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.
- El Goonish Shive has Diane, the Queen Bee of Moperville South who is somewhere between this and Onee-sama (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 as senior and acts very protectively toward "her puppy" who is tiny and feels even smaller.
- Amethyst Lashiec from Heart Core is like this, both to her actual younger sister Sukina, and to her sidekick Lutz.
- Murf's sister Kelly in Khaos Komix.
- Misfile: Once she lightens up after 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 Gender Bender who is absolutely horrified at the thought of remaining anybody's sister this works more as a deconstruction than anything else.
- Ow, my sanity literally introduces this character as the Cool Big Sis.
- Dora of Questionable Content 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, Faye made a point of humming "Mrs. Robinson" after the hook-up.
- Nique to Criminy in Sinfest, though its more along the lines of Nique considering him to be like a little brother. She can be very protective of him, something Fuchsia found out early in her romance arc.
- Rhea of Slightly Damned is this way to both Buwaro and Kieri.
- During the "Phoenix Rising" arc of Sluggy Freelance, Oasis takes on this role to Katie. Since Oasis is a semi-psychotic assassin/vigilante with an All Crimes Are Equal attitude, this really freaks out Katie's mom.
- Subverted in Sticky Dilly Buns. 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 past career as a porn star (which Ruby discovered in a traumatic fashion), thinks that Amber benefits from Parental Favoritism, 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.
- Homestuck: 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 Cloudscratcher is an adoptive one to Felix.
- In RWBY, Yang is this to Ruby, She actually used to read bedtime stories to her every night when they were younger.
- Ilivais X has Mille, who's a more Hot-Blooded 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 broken Token Mini-Moe protagonist instead of the usual archetypes present.