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Cool Big Sis
aka: Cool Big Bro

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If your show is aimed at a younger audience, this young woman (usually in her mid to late teens, sometimes in her early 20s) will be the character everyone thinks is cool due to the maturity, competence and style her age brings along. Her personality can vary widely from the Tsundere to the Emotionless Girl to the Tomboy, but she will be at least considered as a candidate to the Team Mom and a mentor-like figure to boys and girls alike. The Shorttank often admires her, even when she playfully flirts with the much younger male lead and steals everyone's attention, and the Shrinking Violet will admire and at the same time envy how more open she is with her thoughts and feelings.
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This young lady may catch a Shōnen series lead's eye, though often more due to her hotness if he has already entered puberty. 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 is truly afraid of.

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

Compare Onee-sama, 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. Contrast with Disappointing Older Sibling if she's regarded with shame and derision in the eyes of her younger siblings, and Big Brother Mentor, a similar but not identical trope much more common in male characters.

Almost all of these characters will have some form of a Big Sister Instinct.


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    Comic Books 
  • Batman:
    • Barbara Gordon is usually the cool big sis type for Dick Grayson (until they formed a relationship), Jason Todd (in the New 52), Tim Drake (especially prior to Flashpoint and in Batman: The Animated Series) and sometimes to Damian.
    • Huntress also plays this role for Tim, viewing him as an endearingly annoying little brother. She occasionally plays Team Mom during teams up like in Superman/Batman: Public Enemies when Tim and Cassandra are goofing around during the mission and Huntress tells them off.
  • Black Canary: Towards Roy Harper, Conner Hawke, and Mia Dearden, as well as Emiko Queen in Green Arrow (Rebirth), not to mention Sin. Thanks to the significant age gap between her and Oliver, she was actually closer in age to his ward and son, so while technically she's their adopted stepmom, they generally saw her as more like a sister. She was also this to Stephanie Brown briefly, though her relationship with the Batkids hasn't been as explored.
  • Gender Queer: A Memoir: Maia's older sister Phoebe, whom e gushes about, is a very hip, accepting person (and illustrated this book).
  • 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. That said, based on Endless Nights, it took her some time to grow into the role, as she was much less pleasant when younger ("some time" being on the order of billions of years).
  • Spider-Man, by now in his late twenties, tends to act as an older brother figure to several other younger heroes in the Marvel Universe whenever he makes guest appearances in their books.
    • Miles Morales, the younger, less experienced Spider-Man has been mentored by Peter ever since Secret Wars (2015), since he's only been Spider-Man for a few years.
  • Wonder Woman (1987): Wonder Girl Cassie Sandsmark really looks up to and admires the first Wonder Girl, Donna Troy who was the first adult to take her seriously as a hero instead of trying to talk her out of it and gifted her the bullet-proof bracelets Donna wore during her time as Wonder Girl.
  • X-Men:
    • Originally Jean Grey was this to newcomer Storm, Storm was this to then newcomer Rogue and then Rogue became this to Nightcrawler when she learned he was the son of her surrogate mother Mystique.
    • When Jubilee shows up Jean, Storm and Rogue alternate between this for her.
    • Storm also filled this role toward Kitty Pryde. She calls the younger woman "Kitten" as a mark of affection and to Colossus and Nightcrawler, both of whom she affectionately calls "little brother".
    • Jean was also like this to Kitty when they first met, which serves as Fridge Brilliance as Kitty does the same for young Jean.
    • Despite a few betrayals Psylocke and Emma Frost can be this for the younger X-Men.
    • 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.
    • Laura becomes a much more literal one in All-New Wolverine to Gabby, a 13 year-old clone created by Alchemax Genetics, who greatly looks up to her.
  • 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.

    Fan Works 
  • A Ballad of the Dragon and She-Wolf: Daenerys is this for Arya and it's a major theme. They quickly become close friends and confidants in part due to common experiences and even adopt each other as sisters. Arya's crush on Daenerys is purely Platonic, but that doesn't stop Sansa (ie her biological sister) from speculating there is something more going on.
  • A Crown of Stars: Misato is a mix of Parental Substitute 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."
  • Advice and Trust: 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 Parental Substitute gets blurred as time goes on.
  • Child of the Storm:
    • Jean is this to the entire Xavier Institute's student body as the de facto headgirl, though she reserves particular amounts of this for her younger cousin, Harry (who both happily reciprocates and struggles with his hormones), and her stolen at birth twin sister, Maddie Pryor a.k.a. Rachel Grey, who was raised as a Living Weapon by Sinister (post Heel–Face Turn and discovery of her origins, she goes by Maddie Grey). While the latter is the same age as her, in terms of social skills and normal life experience, she is far, far behind. However, the sheer self-imposed pressure, plus her many other responsibilities and Go-Getter Girl facade, plus the fact that she's a teenager, leads to a breakdown around chapter 50 of the sequel - though she remains this after she balances out a bit.
    • Carol is this to Diana and, briefly, to Bobby Drake and Mattie Franklin. However, she isn't this to her own little brothers, partly because of her difficult home-life, being more of an Aloof Big Sister - as the older of the two, Stevie, points out in the sequel. Carol admits, somewhat ashamed, that he's right (though it should also be noted that she's affectionate enough and violently protective of them, she just tended not to pay too much attention to them). She gets better afterwards, and also takes this role towards Peter Parker in Unfinished Business.
    • Harry and Jean-Paul both take this role towards Clark in the sequel, the former in particular - it helps that they actually look like they could be brothers.
  • Doing It Right This Time: After finding out Rei is (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.
  • Racer and the Geek features Rainbow Dash playing this role to Scootloo.
  • Ruby and Nora: Yang is still this, and Winter plays this trope much more straight due to Adaptational Nice Guy.
  • A Growing Affection has Yugao Uzuki serve as this to both Team Kakashi and her own team.
  • The Black Sheep by A.A. Pessimal 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.
    • Much later in the cycle, Johanna's two younger daughters both have this relationship with their oldest sister Rebecka. Even the wild child of the three, Famke, will shut up and do as she's told when Bekki gets insistent. Ruth, the youngest of the three, adores her oldest sister and even schemes to fix her up with a boyfriend.
  • 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.
  • In Neon Genesis Evangelion: Genocide, 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…
  • Facing the Future Series: Once Danielle joins the Fenton family, Danny and Jazz both grow into this role easily.
  • The Reactsverse has a few examples:
    • Weiss Reacts: Yang and Winter, as in canon, although Winter is far more of a Team Mom than her canonical counterpart.
    • Lucina Reacts: Reflet and Cordelia are this to Robin, though Reflet is more mischievous.
    • Corrin Reacts: Scarlet is this, as in canon, and Azura is viewed as this by Elise.
  • The Aftermath of the Games 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 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 related to one another, with the former regarding that as obvious.
    • Princess Twilight becomes Sunset's Big Sister Best Friend Forever, after the latter ascends to alicornhood and Celestia asks to be their Parental Substitute.
    • 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. Word of God says Sunset has this relationship with Sci-Twi, with the former helping the latter through her nightmares and providing her advice and moral support.
    • Adagio, despite her flaws, deeply cares for both Aria and Sonata, even willing to team up with the Rainbooms to rescue them from the Changelings.
  • Most Pucca fanfics tend to portray Pucca herself as being one to Garu's younger brother Gura, a popular Urban Legend of Zelda character in the Pucca fandom. Those same fanfics also tend to have Garu himself be a Cool Big Bro (as well as Promotion to Parent) to him as well.
  • In Pokémon Reset Bloodlines, Pike Queen Lucy becomes this to Brock's siblings, especially after they start dating and become engaged.
  • In addition to the canon examples, the RWBY/The Hobbit/The Lord of the Rings Fusion Fic Rise of a Star Knight and its sequel, Knights of Remnant: The Ring of Darkness, gives us Jaune's older sister, Carolina Arc, who gave him a copy of her transcript to sneak into Beacon, taught him how to fight and how to use his Star Knight powers after the Fall of Vale, and is the General of the Sky Knights of Vale, which, as the Star Knight of Vale, is Jaune's personal army.
  • Constants and Variables: 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.
  • In Rick and Morty New Drama Adventures, Emma plays this role for Kitty.
  • Much as in canon, Hawke is this to her younger sister Bethany in Skyhold Academy Yearbook. They are extremely different, but very close.
  • In Karma in Retrograde, Touya was this to his younger siblings, shielding them from Endeavor's abuse at his own expense and always trying to put a smile on their faces through bad jokes and play. He's utterly horrified to discover that he becomes Dabi, a murderous villain who is willing to attack his youngest brother.
  • In Fractured Fates, Kaneki acts as this towards the short and timid Asuna. She also acted as this towards her actual younger sister, Yuna, prior to her death.
  • In Danny Phantom fanfic Resurrected Memories: Ember during her first life as Amberline McLain was this to her little sister Amy, this comes back to haunt Amy quite literally when decades later she, now going by the nickname A.J. becomes a long-term substitute at Casper High around the same time that a still 16 year old but now half-ghost Ember infiltrates the school under the very clever name of Amberline Lain who then ends up saving Amy's younger daughter Maggie and befriending her older one Zoe all without Ember, Maggie or Zoe ever suspecting their connection.
  • Due to Naruto being adopted by Jiraya and Tsunade in Son of the Sannin, Shizune acts as his older sister and is a major influence during his childhood (in particular, she's the one directly responsible for him and Hinata becoming friends). She also fills this role for Kaida and Hagane after they're born.
  • Total Drama All-Stars Rewrite: Cameron says that he sees Zoey and Gwen as these to him. Zoey also sees Gwen as one.
  • In EVA Sessions: Someplace Vast and Dry, Misato is a straightforward example, as she is literally Shinji's and Rei's adopted older sister without the Parental Substitute and Mrs. Robinson subtexts of her canon counterpart; Asuka also fondly remembers her as her babysitter.
  • Karai becomes something like this to Mikey in The Chronicles of Karai Getting Her Shit Together, often humoring his weirder habits and claims (coming find that he is more aware of his surroundings that he seems) and even offers to beat up Raphael for him when he feels like he can't handle it.
  • Becoming more than what I am.:
    • The Archangel Gabriel is this to Max, having been the one to give her her sword and offering her advice when she needed it.
    • Gender-Inverted. While Lucifer is annoyed that Max didn't take his side during the rebellion and Max felt that Lucifer was a traitor, otherwise Lucifer gets along with her more than their other siblings.
  • In Safe Anchorage, Asha Greyjoy takes on this role both for her actual younger brother Theon, and for Jeyne Poole, who has no family remaining. She's brusque and straightforwards, but also caring and protective towards both of them.
  • Gender-inverted with Jason Todd in The Virtue of Revenge, who acts as a loving older brother to Damian. He also deliberately invoked this, as he wanted to be a brother Damian could look up to and tried to avoid turning out like his Aloof Big Brother Dick Grayson. It ultimately payed off, since Damian greatly looks up to Jason.
  • Peta in Peta Parker has a particularly close relationship with Morgan Stark, one of her jobs as a Stark Industries intern being to act as her babysitter.
  • With Naofumi being 10-years-old in Shield Kid's Bizarre Adventure, Motoyasu and Ren play this role. But while Motoyasu plays the trope straight with ease, it's deconstructed with Ren, who struggles to maintain his cool persona to keep the image Naofumi has of him.
  • In Infinity Train: Blossoming Trail, Parker reveals that his sister Chloe is one of these because of how she makes amazing horror stories and all sorts of spooky shows. It's through her that Parker is more confident with his interests.
  • Rachel in Cardcaptor Rad, as despite being Rad's cousin, acts more like an older sister to him and his friends given she's extremely protective of them. Hot Shot also has been slowly evolving from his One of the Kids mentality to something of an older brother figure to the kids.
  • Trading Game: The main protagonist Yuuna serves as this for Mei and many of the orphans in the Fusion Dimension. She later becomes this for Serena and Yuri when attending Duel Academia.

    Films — Animation 
  • Tadashi Hamada of Big Hero 6 is a total Cool Big Bro, so much so that he was deemed to be Too Cool to Live by the story writers. His friends in the Nerd Herd at the university follow his example, quickly becoming devoted to Hiro and looking after him after Tadashi's death.
  • 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.
  • Queen Elsa from Frozen used to be this (literally, with her ice powers) 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 first film, they have rekindled their relationship.
  • In The Incredibles, Violet becomes this for Dash and Jack-Jack once she gets over her personal issues.
  • Tigress in Kung Fu Panda 2 to Po, if you want to disregard the hints that she may be falling in love with him.
  • Played with in Lilo & Stitch. It seems like Nani used to fill this role for Lilo, but once she had a Promotion to Parent, their relationship becomes much more strained.
  • Ariel in The Little Mermaid is like this to Flounder and is always looking out for him when she takes him on her adventures. Not to mention, she can even be playful with him. Since Ariel only had sisters, Flounder acts as her surrogate little brother.
  • Wendy in Peter Pan. The title character takes her with him to Neverland specifically to be the Team Mom for the Lost Boys.
  • In Ralph Breaks the Internet, the Disney Princesses become these for Vanellope, encouraging their young friend to pursue her dream. Shank also becomes something of a big sister/motherly figure to Vanellope, reassuring her that she and Ralph don't have to have the same dreams.

    Films — Live-Action 
  • Kitai's big sis, Ranger Senshi in After Earth.
  • Au revoir les enfants: Julien's brother is usually patient and cordial toward him and shares some of his contraband with him.
  • Bee in The Babysitter acts this way towards Cole, the adolescent boy she's babysitting, with the two of them dancing, breaking into his parents' liquor cabinet, and chatting about Cult Classic movies. It's all so that she can get close to him, as she needs the "blood of the innocent" for a Satanic ritual. After defeating Bee, Cole tells her that he feels genuinely betrayed by her for what she and her friends did to him.
  • 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.
  • Tim's brother-in-law Sidney in the Confessions of a... series, who pulls strings to get Tim a job and often works alongside him.
  • Carla, while Madeline's nurse and old enough to be her mother, has this dynamic with her in the movie adaption of Everything, Everything. She allows Madeline to see Olly despite knowing Pauline would not promote this, leading to her getting fired.
  • Fear Clinic: Based on the Happy Flashback, Caylee doted on her little brother, and was taking him to the diner to have pancakes during the shooting.
  • Fists of the White Lotus: The hero, Man Ting-Hung, became an expert fighter capable of defeating the dreaded White Lotus Chief thanks to training and advice from his older sister, Mei-Hsiao, who is a capable fighter herself and gave him the idea of training with paper dummies in order to overcome his enemy's qi powers.
  • The Hunger Games: Katniss Everdeen to Prim and Rue, so much so that she offered herself up as Tribute to take her little sister's place in the Games.
  • In the film adaptation of The Lord of the Rings, Éowyn very much took on this role for Merry.
  • Marvel Cinematic Universe
    • Natasha Romanoff aka Black Widow gives off this vibe to Tony Stark (Iron Man), Steve Rogers (Captain America), and Clint Barton (Hawkeye) despite the occasional Ship Tease she has with them. Lampshaded in Avengers: Age of Ultron when Cap drops his shield during a car chase and she picks it up, while complaining like a bossy older sister.
      Black Widow: I'm always picking up after you boys.
      • Natasha's solo movie establishes that she was this to her adoptive younger sister Yelena Belova. Flashbacks to their childhood show them happily playing together and when they're reunited as adults they quickly fall back into their old patterns of behaviour.
    • Thor was shown to have had this dynamic with Loki when they were kids, as while Loki still envied him, they were very much playmates and loved each other. He becomes this to Loki again when he pulls out a true Heel–Face Turn at near the end of Thor: Ragnarok.
    • Despite frequently fighting and squabbling with her, Gamora manages to be this to Nebula, especially towards the end of Guardians of the Galaxy Vol. 2 where she saves her sister from the burning wreck of ship and even hugs Nebula before she leaves. Also, despite despising Gamora for unintentionally causing most of her body to be replaced with cybernetics (as their adoptive father Thanos would do it every time she lost to Gamora), she states that compared to rest of her siblings (the Black Order), she hated Gamora "the least". And in Avengers: Infinity War, we can understand why Nebula thinks so.
      • Also in Infinity War, Gamora reveals the location of the Soul Stone to Thanos as she couldn't stand to see him torture Nebula in exchange. Nebula for once returns the favor by plowing into her father during the Final Battle, demanding to know what he did with her sister and is horrfied to discover he murdered her to get the Soul Stone.
      • Gamora is also like this to Rocket Racoon and Mantis.
    • Nakia to Shuri in Black Panther, to point where the latter hopes she'll be with her brother T'challa so she'll be part of the family. Okoye is this to T'challa, Nakia, and Shuri, acting as personal bodyguard to the Golden Tribe.
  • The Smurfs 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.
  • 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."
  • Although it's implied that he also is attracted to her, this is the main dynamic between the 15-year-old protagonist Jamie and the 24-year-old artist Abbie who boards in his mother's house in 20th Century Women. He finds her fascinating and essentially does anything she suggests he do, whether that be start reading feminist texts or try to perform an unsuccessful Relationship Upgrade with his Childhood Friend Julie. Notably early in the movie Jamie's mother Dorothea asks both Abbie and Julie to be in his life in ways he wouldn't allow her to be, and Abbie takes this to be a sort of mentor figure who is willing to buy him beer and "teach him how to verbally seduce women", as she puts it.
    • Julie herself, despite the fact that she is 2 years older than Jamie and views their relationship as being Like Brother and Sister, is an aversion of this trope as they seem to view each other as being essentially on the same level, maturity wise.
  • Under the Bed: Neal acts this way toward Paulie. It helps that they've both been stalked by the monster living under Neal's bed.

    Literature 
  • Nellie from The 39 Clues.
  • The Alice Network: Charlie tells us that Rose, her cousin, was like an amazing older sister to her. She ignored their age difference, played with her, confided in her, taught her how to do things, and was generally super cool.
  • 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.
  • Jacyl acts as one to The Hero, Lyra, in Black Dogs.
  • Eldest Whistler in A Brother's Price. She also doubles as an Aloof Big Sister. She leads, the others follow.
  • Attractive and intelligent Melodía of The Dinosaur Lords tries to be this for her younger sister Monserrat, as their father rarely notices they exist.
  • Dying Embers: Amadahy Love has raised her brothers and cousin for the past seven years.
  • Eva Luna gives us the rare transgender 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.
  • Subverted in the Maeve Binchy novel Evening Class, 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.
  • Harry Potter: There are various conflicts among the younger Weasleys, but all of them seem to look up to the two eldest brothers, Bill and Charlie.
    • Tonks is this to Ginny and Hermione. She uses her Voluntary Shapeshifting powers to amuse them, and at one point takes a redheaded form that Harry even thinks makes her look like she could be Ginny's sister. Hermione admires her for being smart enough to become an Auror, and Ginny goes so far as shipping her with Bill (in part because she doesn't like his actual fiancée, Fleur).
    • In the Distant Epilogue, Teddy Lupin is this for the Potter kids. Bonus points for being the son of the above-mentioned Tonks.
  • Raven becomes more and more of this as the H.I.V.E. Series goes on, particularly to Otto and Wing, who are both orphaned early on.
  • In The Host (2008) 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.
    • Oh when she learns that the Rebel Leader is responsible for Prim'a death, she chooses killing her over killing the Big Bad that's how much Katniss loves her sister.
  • In I've Been Killing Slimes for 300 Years and Maxed Out My Level, Azusa refers to Beelzebub as this, when thinking about what traditional family roles members of her Family of Choice fit into. This is because Beelzebub is the oldest in the family group and whenever Azusa and the others need help Beelzebub is the one they turn to. It's to the point that when Pecora suggests Azusa to be this to her, Azusa muses that Beelzebub would have been a better choice for that role than she is, something Pecora agrees with and is miffed that Beelzebub refuses to comply with the idea of acting domineering towards her king, forcing Pecora to look elsewhere.
  • 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.
  • May was this to Laurel in Love Letters to the Dead, to the point where Laurel is incapable of seeing May as anything less than perfect following her death. This is to mask the fact that Laurel is fighting some serious unresolved feelings of anger towards May for something that happened before she died.
  • In One Of Us Is Lying, Ashton is this for Addy. Spots right away that Jake, while outwardly perfect, is a control freak. Moves back home to support Addy when she's a murder suspect, helps her break out of her shell after Jake dumps her, and helps her talk through her feelings about it. Joins in with the investigation, passes vital information along to Eli when he's representing Nate and finally invites Addy to come live with her. In the sequel, she and Eli get married.
    • In the sequel, Knox has five older sisters. The one we meet, Keirsten, clearly thinks the world of her little brother.
  • Wendy Darling in Peter Pan, a devoted older sister to Michael and John who is recruited by Peter to be Team Mom to the Lost Boys.
  • Pride and Prejudice: Part of what gets Elizabeth to change her opinion of Mr. Darcy is realizing he's this to his sister Georgiana, 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.
  • In Prophecy Of The Sisters, 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 now has, a sorta-Promotion to Parent, as the only adult in the house is their aunt, Virginia.
  • The Secret Garden: Martha, to Mary as well as literally for Dickon.
  • 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.
  • 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 (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 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).
  • Yellowfang is this towards Cloudpelt in Warrior Cats: Yellowfang's Secret.
  • Whale Talk: Before his tragic death, Chris's older half-brother Brian treated him well and kept people from bullying him. This is especially noticeable, given that the two of them were raised in separate homes after Brian's dad got full custody of him after leaving Chris's mom.

    Live-Action TV 
  • Agents of S.H.I.E.L.D.: Almost immediately after her reveal as one of the good guys and saving her, Simmons started gushing over Bobbi Morse.
  • Angel: In a far cry from her Alpha Bitch days, Cordiela becomes a cool big sis to Wesley, Gunn and especially Fred. Cordy is so good at looking after the gang she's essentially Team Mom and her absence is literally when everything goes wrong in Season 3.
    • Fred herself tries to act as one to Connor. It works briefly... when he's in a good mood and she's not torturing him for hurting Angel.
  • 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.
  • Austin & Ally: Ally Dawson shows signs of being this to Nelson, despite being her student. She also acts like this to Lily later on.
  • In the reimagined Battlestar Galactica, Kara Thrace is said to have filled this role for Sharon Valerii.
  • Penny on the The Big Bang Theory to pretty much everyone, but especially her self declared "bestie" Amy.
  • Paige and Frankie end up becoming one to Zane and Rodney starting in the third season of Bizaardvark despite not being related blood-wise. It does help the latter two are fans of the former two's work.
  • In the Korean Series Boys Before Flowers, Joon Hee is the white Ferrari-driving older sister of Jun Pyo.
  • 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.
    • 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.
  • 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.
  • 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.
  • The Fosters: Callie towards her little brother Jude. She eventually seems to develop into this for her foster sister Mariana as well.
  • Full House had DJ Tanner (the oldest) being one of the Cool Big Sis to Stephanie (the middle child) and Michelle (the youngest) when 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 Fuller House, 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.
  • Game of Thrones:
    • 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 Age Lift 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 Non-Action Guy, 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 Big Sister Instinct.
  • The girl of Girl Meets World, 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 Real Life too for Riley's actress Rowan Blanchard being this to Auggie's actor August Maturo and his little brother Ocean.
  • Erica is this to Barry and Adam in The Goldbergs.
  • Gossip Girl: Serena is very protective of her brother Eric and Jenny, her boyfriend's younger sister.
  • Referenced almost by name in C-drama The Holy Pearl between Mu Lian and Yu Die.
  • In How I Met Your Mother, Robin tries to be this to her younger sister Katie. She is somewhat is, just not in the way she is trying to be.
  • Kamen Rider
    • Kamen Rider Den-O has two examples for Ryotaro: Hana, who acts as one to him, being concerned with his condition while making sure none of the Taros do anything crazy involving him, even after she later gets de-aged and is eventually revealed to be his niece from the future, and Airi, who is his literal older sister, being the one to raise him after their parents' deaths and acting sweet and gentle to him (except for most of episode 30), even welcoming Ryutaros with open arms once the two eventually meet.
    • Kamen Rider Kiva: Megumi Aso to Wataru, being the one who helps him realize his "allergies" were all in his head and overall being very supportive of him, even being a Shipper on Deck between him and Mio. Megumi also has an actual younger brother named Mitsuhide, who she showed to him about how much she desired to be a warrior to continue in their mother's footsteps.
    • Kamen Rider Double: Wakana Sonozaki to Philip. Best illustrated in a flashback where younger Phillip convinced Wakana not to retaliate back because he believed her as his nice older sister.
    • Kamen Rider Ghost: Akari Tsukimura to Takeru, especially since they and the Fukami siblings were all childhood friends, firmly caring about him wanting for him to come back to life with the Eyecons the most.
  • Liv and 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.
  • Once Upon a Time: Red seems to have developed into this for Henry, which makes sense she's his grandmother's best friend.
  • 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).
  • Sherlock: Sherlock seemed to have developed this for Mary and, since she understands the fact that he's different, rather than freaked out by it. Also, despite the fact she shot him, she's about as loyal to John as Sherlock is, since they're both willing to do anything for him. Anything, really. And Sherlock 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.
  • In The Sopranos Carmela is angry with Meadow for covering up for little brother Anthony getting a downtown hotel room and getting drunk with his friends; Tony responds, based on his own childhood, that that's what big sisters should do.
  • Played with in regards to Nancy in Stranger Things while she did apparently dress up as elf during a Dungeons and Dragons campaign for her little brother Mike and his friends, Nancy due to peer pressure and growing more shallow in order to impress the cool kids treats the younger boys like a bad smell at the start of show. It's not until the death of her friend Barbra and facing the horrors along side Will's big brother Jonathan that Nancy truly becomes a cool big sis to Mike and the other boys. In the finale of series 2 where after seeing Dustin crying at prom because he got rejected to dance and mocked by popular girls, Nancy herself takes Dustin out to the dance floor (to the shock of the mean girls), she even claims to liking him the most out of her brother's friends and gives Dustin some advice about girls. This is a far cry from the girl who slammed the door in Dustin's face when he offered pizza.
  • The Twilight Zone (1985): In "Grace Note", Rosemarie Miletti is the eldest of five children and enjoys strong relationships with all of her siblings, especially Mary who is dying of leukemia.
  • 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.

    Music 

    Visual Novels 
  • Esperia seems to have this role among the spirits in Aselia the Eternal - The Spirit of Eternity Sword. Halion really tries, but she's a bit too slow and strange to pull it off.
  • Kyou Fujibayashi from CLANNAD to her twin sister Ryou.
  • 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.
  • Amane in The Fruit of Grisaia 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 The Eden of Grisaia 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.
  • Akira Satou from Katawa Shoujo, with the bonus of being Lilly's actual older sister.
  • Kurugaya from Little Busters!. She actually encourages the girls from the group to call her "Anego" or "Onee-san".
  • Majikoi! Love Me Seriously! 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... 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 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.
  • 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.
  • Noan starts out bullying Setsuna in Shiny Days but as time goes on and Setsuna stops being The Load at work, she generally starts treating her nicer and starts offering some practical advice.

    Web Animation 
  • DSBT InsaniT: Whitney is towards her younger brother Bill, although their relationship isn't explored as deeply as her's and Dave's.
  • RWBY:
    • Yang Xiao Long is this to her younger half-sister Ruby Rose. She actually used to read bedtime stories to her every night when they were younger. Slightly tragic example considering has out of circumstantial necessity: Yang's mother abandoned her father when she was a baby. Her father ended up marrying Ruby's mom, a mutual long-time friend, but then she disappeared while on a mission when Yang and Ruby were very young. Yang was pretty much forced to pick up the mantle to a degree for her younger half-sister. Yang would later go on to become a bit of Team Mom for the group, managing (in her own special way) to talk Blake out of her Heroic RRoD.
    • Weiss Schnee has her own older sister, Winter, who serves as a foil for Yang, being more of an Aloof Big Sister who Weiss holds in great esteem. Aloofness aside, Winter clearly loves Weiss deeply.
  • Both versions of True Tail have Melody Briar being one to Caleb. The first version had Melody treat Caleb as a close friend and giving off implied intentions of acting as a secondary mentor to him (since Caleb in that version was technically a squire being trained by the bear knight Brutus). The second version made the trope more official by having Caleb be Happily Adopted by Melody's family and one of Melody's reasons for training to become a bard being so she can sing about her adopted younger brother's heroic exploits.

    Webcomics 
  • 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.
  • Da-Jeong from The Friendly Winter 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 smaller than him. It's suggested they might literally become siblings if their parents hook up.
  • Amethyst Lashiec from Heart Core is like this, both to her actual younger sister Sukina, and to her sidekick Lutz.
  • 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.
  • Magick Chicks: As the 'Big Girl on Campus', Faith is greatly admired by the student body at Artemis Academy for her leadership ability, and because they know she'll protect them.
  • 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.
  • Never Satisfied has January, who roughhouses with her younger brothers, and Lucy, who acts in this capacity to the beggar kids they get food for.
  • 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.
    • Faye is this towards Sam, teaching her to weld and make mixed drinks.
  • Pen & Ink: Penny Ewart ("Pen") is nothing but loving, playful and supportive toward her little sister Inkara ("Ink"), although there are moments when the latter can get on her nerves.
  • In Rhapsodies Tara, the older Fitzpatrick sister, used to get off on this quite a bit… along with being a bad influence.
  • 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.
  • 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.
  • Yuri Jahad 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 needs. The younger characters, which would theoretically apply to everybody in the main cast since she is 618 years old, but especially Endorsi and Bam, refer to her as noona and unni, the Korean honorifics for elder siblings.
  • Eloria Kierobrung from White Dark Life is, while violent and destructive, very caring for her younger brother Luka(and most children as a whole), having practically raised him thanks to their father being very aloof to them. 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 she seriously regrets it.

    Web Original 
  • TT is this to all the other cats in Cream Heroes. Despite her standoffish nature, she will mentor the younger cats keep them in line. This even extends to newcomer Nana and her two kittens. Nana has become her friend while Toto and Dodo are the only cats allowed to punch her without getting hit in return (at least for now).
  • Fallout Is Dragons has an interesting case of mutual Cool Big Sis with Aurelia, the magically aged up dragon, and Flotsam, the bomb-toting pegasus filly.
  • 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.
  • Rob Walker is this to Doug Walker.
  • Having an older female sibling care for you in some way is a popular roleplay scenario in ASMR videos, including Ear Cleaning, putting on makeup, and many other themes.

    Real Life 
  • "Rent a Sister" is an attempt to apply this trope to the real world issue of Hikikomori. These women act as a non-relative, but also non-medical, counselor and friend to try to get the Hikikomori to rejoin the world. The effort can often take years.

 
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Alternative Title(s): Cool Big Bro, Cool Big Sister

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Cordelia Starling

Juliet's big sister. 20 years old. A real crack shot with a sniper rifle. When she's not hunting zombies, she's a professional assassin, although Juliet thinks she's being scouted by universities.

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