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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 Tsundere to Emotionless Girl to Tomboy, but she will be at least considered as a candidate to Team Mom and a mentor-like figure to boys and girls alike. The Shorttank often admires her, even when the latter playfully flirt with the much younger male lead and steal everyone's attention, and the Shrinking Violet will admire and at the same time envy how more open her she is with her thoughts and feelings.

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.


Note that, while less wide-spread, 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.



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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.
  • Dragon Ball:
  • 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.
  • Erza Scarlet from Fairy Tail definatly qualifies. She is respected and admired by her fellow guild mates and especially Lucy looks up to her. (In a letter Lucy wrote to her mother she describes Erza as cool, beautiful, warm and full of passion) She is someone relied on by everyone and capable of keeping the chaotic guild under control with one glare.
  • 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, Chopper and Carrot 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 who hugs her frequently and goes shopping with her.
    • Robin also treats the other males of the crew (besides Chopper) in this fashion: like goofing off with Luffy (even ticking him and Chopper), caring greatly for Usopp (ever since he saved her life in Enies Lobby) and putting a blanket over a sleepy Sanji in Filler despite him being a Handsome Lech to her occasionally.
    • Nami also has Nojiko, her "sister" who was adopted with her by Bellemere, Nojiko is willingly to take a bullet for sister and when Nami was distraught about the tattoo that Arlong gave her Nojiko got herself tattooed so her sister wouldn't feels so different. The gold bangle Nami wears constantly after the Arlong Park Arc is from Nojiko.
    • Viola to Rebecca though she's actually her aunt, she looks young enough to be her sister and cares greatly for niece to point where's Viola is comforting Rebecca as Domflamingo is forcing the latter to kill her thankfully stopped by Luffy. This care likely comes the fact Rebecca's mother Scarlet was a Cool Big Sis to Viola herself.
    • Initially it seems subverted with Vinsmoke Reiju to her third brother Sanji as she did nothing to stop his brothers bullying him only laughing at his misery and also putting explosive handcuffs on him so he wouldn't escape his Arranged Marriage year later. But of course subverted as Reiju does actually deeply loves her little brother and patched Sanji up every time his brothers brutalized him, she then freed him from his captivity and tearfully told him to escape to the East Blue. Years later she still the only family member to treat Sanji with genuine affection, marveling over his newfound strengh and impressed with his chivalry, when she learns Big Mom plans to annihilate the Vinsmokes she tells Sanji to flee saying they aren't worth saving after how they've treated him the White Sheep of the family. Sanji refuses however and rescues her during the wedding, knowing she out of all his family is Worth It.
      • Reiju exhibits her care for Sanji though other actions like how she kicks her youngest brother Yonji aside like he's dirt but never lays a hand on Sanji and kills Mooks who try to shoot him down while he's flying away.
    Reiju: Anyone who touches my little brother will have to answer to me
    • Charlotte Smoothie while very nonchalant most of the time will act aggressively to anyone who hurts her younger siblings, as in the anime when Reiju poisoned Mascarpone and Joscarpone, she quickly used the her powers to wring the poison out of them and attacked Reiju in revenge.
  • In My Neighbor Totoro Satsuki is this for Mei (Hayao Miyazaki seems to like this trope).
  • In Ranma ½, though she ends up playing the Yamato Nadeshiko so straight she becomes a parody of it, Kasumi Tendô is a gentle, kindhearted woman who holds the Tendô household together, always tries to comfort her family, thinks the best of others and displays a subtle comic wit, often trying to pull off a one-woman Boke and Tsukkomi Routine. Akane Tendô, 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.
  • Neon Genesis Evangelion: Misato Katsuragi tries to be one to her wards, Shinji and Asuka. Unfortunately, they are two severely traumatized kids, and her own issues made her hard to connect with them and help them. As a result of it, she failed them when they needed her the most.
  • Two aversions 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 met 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! 5D's fits this, generally keeping track of Rua and Ruka/Leo and Luna 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.
  • 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".
  • Pokémon
    • 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 X and Y, Serena fulfills this role for Bonnie and later Mairin.
  • In Pokémon Adventures, 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).
  • Kuwabara Shizuru in Yu Yu 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. She seems a bit older than the other girls. Sixth Ranger Petra, despite being the most teenage, does not apply here since she doesn't even interact with the others.
  • Technically she's the cousin of 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 note .
  • Meryl towards Milly in Trigun, ironically Meryl is half Milly’s size.
  • 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-HiME who, atypically for this trope, is a Shōnen 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.
  • Gundam
    • 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).
  • Super Dimension Fortress Macross/Robotech: Claudia acts as a big sister figure to Misa Hayase/Lisa Hayes, often by lending an ear when Lisa's stressed and needs to vent, and occasionally gives her relationship advice to help her get closer to Hikaru Ichigo/Rick Hunter. Though when it comes to her fellow Bridge Bunnies (Kim/Kimberly, Vanessa, and Shammy/Sammy), she's the Team Mom.
  • 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 GUN×SWORD 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 adaptations 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.
  • Madlax
    • 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, Yukko befriends the Professor and becomes this. The Professor adores her and, in a manga chapter, Yukko proves more capable than Nano at dealing with her temper tantrums and a Time Skip chapter has an adolescent Professor ecstatic on hearing Yukko is returning to Japan.
  • 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 & 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 Horizon in the Middle of Nowhere. 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 jerkass demeanour brought on by having to be the ideal Nishizumi heiress, which she does so that Miho will be free to live her own way.
    • 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.
  • If Her Flag Breaks: 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? Ryuko, of all people.
  • In My Hero Academia the mature Momo Yaoyorozu invokes this with the younger girls namely Ochaco Uraraka and Tsuyu Asui.
  • In A Centaur's Life, 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.
  • Yoshiyuki Tomino is supposedly trying to invoke this with Aida in Gundam: Reconguista in G.
  • Definitely related to above, this is very strongly invoked by Kamiki Mirai from Gundam Build Fighters Try, older sister of (one of the three) main character, Kamiki Sekai. Not only is she beautiful to the point of charming almost literally everyone who sees her, she is also very supportive of whatever her little brother takes interest in, be it martial arts, or toy battle. That said, when he gets himself into a police station or gets distracted away from finishing transfer student registration, she does show some stun side.
  • Is the Order a Rabbit?'s Cocoa tries to act like one. Though it doesn't work very well on Chino, Megu seems to buy it.
  • Variable Geo: Satomi is a literal and borderline tragic example, given she's been left to support herself and her brother, Daisuke, since their parents deaths, years ago. She's held two jobs to make ends meet, which includes Daisuke's medical expenses, and goes so far as to submit herself to The Jahana Group for experimentation, after they offer to take over the costs of Daisuke's medical treatment.
  • Shinshunki Miman Okotowari invokes the trope since the heroine, Asuka, aims to become this towards her recently found half-siblings Manato and Kazusa so they'll accept her in their family. Things get muddled, however, when she starts feeling attracted to Manato and he eventually reciprocates..
  • Given the Central Theme of family and an incredibly large cast of female characters, Lyrical Nanoha has a lot of examples:
    • The first example in the franchise is Nanoha's older sister Miyuki.
    • Nanoha described Farin, head maid of the Tsukimura family, as being one for Suzuka. Suzuka's actual sister Shinobu is probably closer to an Onee-sama, but they are never shown to interact.
    • Subaru Nakajima loves and admires her older sister Ginga. So do Cinque, Nove, Dieci, Wendi, and presumably Thoma (if they ever continue Force) once they're adopted.
    • Alicia acted this way for Fate when the latter was trapped in a Lotus-Eater Machine. This relationship was carried over to the Magical Girl Lyrical Nanoha INNOCENT spin-off.
    • Arf was somewhere between this and Parental Substitute for Fate back in the first season (since Fate was in desperate need of a positive influence), even though she's technically younger.
    • Amy acted as one for Fate, even before they became sister-in-laws. Lampshaded in the the third A's Sound Stage.
      Chrono: In reality, you’re almost like Fate’s older sister.
    • Vita acts as one for both Rein and Agito. The latter even calls her "Anego" which means "big sister", but it can also mean "boss".
    • Caro stated in a episode of StrikerS that she's always viewed Fate as an older sister instead of a mother, probably due to the fact that there's only a 9 year difference between them.
    • Multiple girls act as this for Thoma including: all six Nakajima sisters, Signum, and Alto.
    • Several of the older Numbers act as big sisters for they younger ones, more specifically: Due for Quattro, Tre for Sette, Cinque for all of the ones that make a Heel–Face Turn (especially Nove), and Sein for Wendi.
    • Nove pulls double duty as both this and Big Sister Mentor for Vivio and her friends, to the point that they name themselves Team Nakajima in her honor when they enter in the Inter-Middle Championship (despite her embarrassed protests).
    • Chantez declares herself as such when she first meets Fuka since she's a sister of the Saint Church and Fuka grew up in a church run orphanage. Nothing ever really comes of it other than her teaching Fuka to swim in the third OVA.
  • Sai in Angelic Layer is this for Misaki when the latter reaches the finals. The first thing she does when they meet is hold Misaki's hand and help her walk out to the crowd. She also helps her discover Hikaru's weakness and through Sai's backstory where we find out she had a little sister who died of an illness, and was her entire reason for playing Angelic Layer it can be assumed she sees Misaki in the same way.
    • Also in a little twist, Hatoko is like this for Misaki as well, despite being a few years younger, by constantly teaching her about Angelic Layer and helping her become a better player.
  • Anastasia of Brave10 becomes Isanami's sister figure after she rescues her from Date and acts as the Good Bad Action Girl to Isanamis's wide-eyed innocent Damsel in Distress. But it's a ruse. Ana actually hates the concept of family-like bonds, and it was all an act, probably devised by Hanzo to eventually break Isanami.
  • Lin (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.
  • Sanae Kashima takes to this role almost immediately in Alice & Zoroku in regards to Sana. Thanks to being forewarned by her grandfather, she's able to take Sana's powers in stride and be understanding about Sana's initial nervousness around her. Sanae wins Sana over in short order by doing her hair for her, making her food, and comforting Sana when traumatic memories start to overwhelm her.
  • Lucoa from Miss Kobayashi's Dragon Maid acts as one to Tohru... when she isn't undercutting her dignity by acting like a creepy pedophile. Tohru used to act as one for Kanna, but their current dynamic has shades of Promotion to Parent (though Kanna strictly views her as an older sister).
  • Kaguya-sama: Love Is War:
    • While their relationship is officially that of a valet and her mistress, Hayasaka acts this way for Kaguya (even though they're the same age) and ever refers to her as a little sister on several occasions.
    • Fujiwara is also this for Shirogane's younger sister due to the latter's friendship with her own sister Moeha, much to Kaguya's jealousy.
    • Kaguya develops this sort of relationship with Ishigami as the story progresses. Maki also acts this way towards him, as befitting her role as Kaguya's Shadow Archetype.
  • Zoids: Chaotic Century: Moonbay is this to Van and Fiona, especially Fiona.
  • Naruto:
    • Ino began as this to Sakura, protecting her from bullies and helping her to realize her potential. However, Sakura came to believe that she'd always be under Ino's shadow, and when they both started crushing on Sasuke she broke it off. After their fight in the Chuunin exams, however, they more or less mend their bonds.
    • As time passes, Sakura herself evolves into one for Hinata and even to Naruto himself. The Last: Naruto the Movie has her helping Hinata reach her affections to Naruto, and then helping Naruto recognize the depth of Hinata's love for him to snap him out of his Heroic BSoD after Hinata is taken away.
  • My Next Life as a Villainess: All Routes Lead to Doom!: Catarina attempts to be this to her adoptive brother Keith, partly because she wants a better endingnote  and partly because she always wanted a little brother in her original life. While she qualifies during their childhood, by the time they're teenagers the level-headed and responsible Keith has become her Cloud Cuckoolanders Minder...and he's nursing an attraction to her.
  • Yugiri of Zombie Land Saga is the oldest, both by date of birth and at time of deathnote , and she seems to be the most level-headed of the zombies, even getting them out of their funk at times. The group as a whole affectionately refer to her as Big Sis Yugiri, and she is especially close to Lily.
  • In Asteroid in Love, Mira's older sister, Misa, is the Student Council President. Mature, composed and easygoing, she does her best to look after Mira. Moe immediately takes a liking to her when they meet. In addition, she eagerly helps out with promoting the Earth Science Club's newsletter, albeit embarrassing Mira in the process.
  • Emma in The Promised Neverland, as well as her younger "sisters" Anna and Gilda. Krone was shown to have this quality in her youth as well. Deconstructed in that the organization that raises them specifically looks for that trait in "Mama" candidates, who are essentially the sheepdogs and brood mares for their People Farms.
  • Love Me For Who I Am has Satori Iwaoka, the owner of Café Question. Satori's only sibling is Tetsu, but she often acts like a Cool Big Sis to the whole staff of the café, and as a Transgender woman she's often able to empathize with their issues and offer advice and support. In particular, when Mogumo's presence in the first volume leads to a rift between the staff over their standard "I'm a guy dressed as a girl" introduction, she encourages all of them to share their point of view on the issue to come to a compromise. This eventually resolves in Mogumo being able to stay in the café without compromising their identity and helps Mei realize she was a closeted trans girl.

    Comic Books 
  • 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).
  • 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.
  • 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.
  • 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 many 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.
  • 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.
  • 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.)
  • 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.
  • All New X-Factor: Scarlet Witch tries to be this for her half-sister Polaris.

    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.
  • 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.

    Films — Animation 
  • Merida from Brave has three little brothers who think she's awesome.
  • 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.
  • 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.
  • 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.
  • Wendy in Peter Pan. The title character takes her with him to Neverland specifically to be the Team Mom for the Lost Boys.
  • 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.
  • Tadashi Hamada of Big Hero 6 is a total Cool Big Bro so much so that he was deemed to 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.
  • 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 
  • 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, Éowyn 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."
  • 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.
    • 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 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 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 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.
  • Kitai's big sis, Ranger Senshi in After Earth.
  • 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.
  • 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.
  • 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.

  • 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.
  • Dying Embers: Amadahy Love has raised her brothers and cousin for the past seven years.
  • 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.
  • 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 (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).
  • Jacyl acts as one to The Hero, Lyra, in Black Dogs.
  • Eva Luna gives us the rare male-to-female 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.
  • 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.
    • 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.
  • 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.
  • 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.
  • 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 is now, in a way, Promoted 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.
  • 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.
  • Attractive and intelligent Melodía of The Dinosaur Lords tries to be this for her younger sister Monserrat, as their father rarely notices they exist.
  • 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.
  • 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.
  • 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.

    Live-Action TV 
  • 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 Series 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.
  • 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.
  • 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.
  • Erica is this to Barry and Adam in The Goldbergs.
  • Referenced almost by name in C-drama The Holy Pearl between Mu Lian and Yu Die.
  • In Pasta, the older sister of Kim Sam is awesome!
  • In Kamen Rider Double, Princess Wakana to Philip.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • Austin & Ally: Ally Dawson shows signs of being this to Nelson, despite being her student.
  • The Fosters: Callie towards her little brother Jude. She eventually seems to develop into this for her foster sister Mariana as well.
  • 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.
  • 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 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • In The Sopranos Carmelo 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.
  • 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.


    Video Games 
  • In Samurai Warriors 4, Lady Hayakawa is this for to the youngsters of the Hojo clan, but it is more obvious with Saburo when he is sent as a hostage to the Uesugi clan, she says she will always help him if necessary and orders Fuuma Kotaro to watch over her.
  • A female Player Character can be this to Mission Vao in Knights of the Old Republic.
  • Comes up in with a couple of classes in Star Wars: The Old Republic. The bounty hunter to Playful Hacker Mako and the Sith Warrior to The Gunslinger Vette (who also happens to be an Expy of Mission). With The Warrior you can even say she's like a little sister when you meet up with her old friends.
  • Nathyrra plays this role to a female Player Character in Neverwinter Nights: Hordes of the Underdark.
  • Persona:
    • A particularly notable example can be found in Persona 2: Innocent Sin with Maya Amano, a young woman who's very much this to the teenage party members. In fact, she's such a Cool Big Sis that in the past, the four younger kids she played with 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.
    • The female protagonist in Persona 3 Portable becomes this to Maiko and a non-romanced Ken, as you progress in their respective social links. She can even tell the former near the end of their social link that even though they'll be separated from each other, they'll still be sisters forever.
  • 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".
    • By Moon Dwellers, Lamia's actual older sister Aschen Brodel comes into the fray and pretty much fits the bill... as in the sarcastic and occasionally hyperactive sister that sometimes tries to rope the more reserved Lamia into her shenanigans.
    • In Super Robot Wars X, Ange ends up becoming one for both Wataru and Nadia. Interestingly Lelouch seem to also serve as a Cool Big Brother to Ange, as he in the very next Scenario after his reintroduction, helps Ange in carrying out a whole operation, to rescue her sister Sylvia. The whole startup is an awesome moment for Lelouch, as it allows the former Holy Britiannian Emperor to show some serious Big Brother Instincts to a fellow Fallen Royal, Ange, by having him really stick his neck out for the former Misurugi Princess, while everyone else were either say "good luck" or try to stop her. The very proposition stuns Ange so much that she thanks him and everyone for their support. And this is not a typical sarcastic "thank you" she gives either, but a true expression of gratitude for everyone's help.
  • Suikoden
  • 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.
  • Claire Redfield from Resident Evil has the best track record of this e.g Sherry in RE2, Rani in Resident Evil: Degeneration (overlaps with Mama Bear) and Moira Burton in Resident Evil: Revelations 2.
  • 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
  • Mia Fey from Phoenix Wright: Ace Attorney to her sister Maya but also to Phoenix.
    • Being level-headed, mature and clever she is always there to help and guide them even after her death
    • The younger version of Mia in Trials and Tribulations has similar motions like Phoenix which shows the strong influence she has on her protegé
    • Also Lana Skye to Ema Skye - in fact Mia and Lana bear many similarities. Both are highly capable and have younger sisters who have helped Phoenix in his cases and both wear scarves tied around their neck in a similar fashion.
  • Fire Emblem:
    • Annand/Mahnya from Fire Emblem: Genealogy of the Holy War is regarded as this by her sister Erinys/Ferry.
    • Lyn from Fire Emblem: The Blazing Blade, especially to Florina (if not more), Nils and Ninian (even when they're technically much older than she is, though to be fair we don't learn that until almost the end of the game.
    • Cecilia from Fire Emblem: The Binding Blade is something between this and The Mentor for Roy and Lilina, being the one who taught them how to fight.
    • Fire Emblem: The Sacred Stones: In support conversations, Tana outright admits that she sees Syrene as this. Syrene's actual sister, Vanessa, seems to look up to her a lot, too.
    • Lucina comes off as this towards the other future children in Fire Emblem Awakening, especially towards Cynthia. Sumia seems to view Cordelia as this as well, though the two are roughly the same age.
    • Camilla from Fire Emblem Fates comes off this way towards her Nohrian siblings, especially in Elise's eyes (who idolizes her enough that she put purple highlights in her hair to match Camilla). Scarlet also has some Cool Big Sis vibes with Corrin in their supports and Revelation interactions, though to a lesser degree than Camilla.
      • Subverted by Hinoka: she loves her younger siblings a lot and that's not for discussion, but she became so focused on training and getting ready to rescue the Avatar that she heavily neglected Takumi and Sakura's emotional needs and her supports with them are all about her realizing it. i.e, in her supports with Takumi she's horrified when he tells her that he thinks she and the others be better off without him, and she has to pretty much yell at him that his death would break her. Plus she had no idea about Sakura's glaring self-esteem problems and, when Sakura explains herself, is genuinely stunned and then explains that they're Not So Different.
    • Sylvain of Fire Emblem: Three Houses often fills in this role for his classmates, as he's the second oldest member of his House and the oldest of his childhood friends. He tends to be someone younger characters go to for advice thanks to how easygoing he is, and despite his womanising he's quite intelligent and insightful on various topics.
  • 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.
  • 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.
  • Dragon Age:
    • Regardless of which one is actually older, a female Warden in Dragon Age: Origins can have this sort of dynamic with Morrigan, or with a non-romanced Leliana, Zevran, and/or Alistair.
    • Isabela acts like this towards Merrill and Bethany in Dragon Age II, especially the former. Whenever Fenris or 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.
      • If Hawke is female, this is implied to be her relationship with Bethany. If Hawke is a mage (and Bethany therefore dies in the prologue), Bethany's character information states that she idolized her big sister. If Bethany survives the prologue, most dialogue options between the sisters reinforce the idea that this is their relationship.
      • Bethany herself gets a turn at being a Cool Big Sis if she survives the prologue and is later sent to the Circle. A letter she writes to her sibling says that she's teaching younger mages, and one of them in particular looks up to her in this manner.
    • Dragon Age: Inquisition makes Leliana perhaps the coolest version of this trope in Thedas towards Josephine, whom she considers one of her few true friends. This can actually cause problems where her methods of protecting the pacifist Josephine are violence, not to mention scare off anyone interested romantically. To Leliana, upsetting Josephine is well worth the price if it keeps her from getting hurt.
      • A female Inquisitor who maxes out Cassandra's friendship can have a relationship with her in which Cass basically takes this role. Cass is canonically in her late thirties or early forties, making her an ideal older sister figure for the potentially younger Inquisitor.
  • 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".
      • Chun-Li technically plays this straight with Cammy as she’s one person the stoic Delta Red agent confides in when she needs advice as seen in the SFV story mode.
    • 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. And in Ultra, she's willing even to return to Bison's side if this means she can save the life of Decapre, the Doll that's actually her clone and the one who's been more physically/mentally/emotionally damaged.
      • Hell in SV5 Cammy even breaks the law and sides with Juri to protect Decapre, and goes apeshit on Vega when he threatens the Dolls.
    • Laura is a one sided case as while she adores her little brother Sean and shows a lot physical affection to him in their interactions, Sean himself can’t stand Laura coddling and wrestling him.
  • 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 Kagura.
  • Advanced V.G.:
  • 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.
  • SoulCalibur: 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.
  • In Battle Fantasia, another game by Arc Systems, Marco Van De Land considers Princess Olivia like a big sister. The feeling seems to be mutual, as Olivia will gladly join in Marco's games. This stems from the fact that Olivia and Urs (Marco's older brother) have known each other since they've been very young.
  • 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 Tales of Vesperia, Judith, after warming up to her teammates, becomes one for the party. She is usually bright in tone, is very reliable, and acts supportively towards her teammates, especially Karol.
    • There's also Yuri, who is generally very supportive and encouraging to his younger teammates, Karol and Patty in particular.
  • 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.
  • You can play this in Baldur's Gate to Imeon, particularly in the second game, but to an extent in the first one. The second game adds Aerie who basically thinks you're the best thing ever.
  • This is of the new villager personality types in Animal Crossing: New Leaf, officially referred to as "Uchi"note . Uchi villagers are blunt and tomboyish, but are also very protective of characters they've befriended. They'll even give you medicine if you get stung by bees!
  • Crash Bandicoot probably isn't the first person you'd expect to be big brother material, but the guy has saved the day numerous times over and is literate with countless forms of combat, weaponry and transportation, all of which is only concentrated when it involves his baby sister Coco. Crash follows her every command and desire, and when the villains target her, he becomes a very different person.
  • In Drakan, Rynn has this in spades with her younger brother Delon. She also appears to have been Promoted to Parent seeing as their parents are never seen or mentioned. This is a sister that was willing to awaken a dragon and bond with him to save her brother. Sadly, though, it doesn't work out in the end, and Delon dies.
  • Mass Effect: Andromeda brings us Sidera and Vetra Nyx who have this relationship. Vetra is very much the Surrogate Mama Bear and extremely protective of Sidera. She is occasionally frustrated from raising her. Sid admires the hell out of Vetra to the point that she uses Vetra's identity to do random good deeds). During Vetra's loyalty mission, their relationship matures a bit, with Vetra realizing Sidera may be a bit green, but she can't be sheltered forever. Vetra becomes more of a mentor and fits this trope better. Of course, neither look it, as both are turians.
    • Ryder can be this if you play the female twin.
  • Arashi of Ensemble Stars! styles herself as this, often referring to herself as 'neechan', particularly when it comes to Mitsuru, her junior in the track and field club.
  • Chrono Trigger gives us Schala, who fulfills the role for her younger brother, but is otherwise too kind and empathetic to actually stand up for herself. In the sequel, it is implied that Lucca acted as this to Kid, to much greater effect.
  • In Farnham Fables, we have Winona Edison and her older sister Wendy, who love each other very much. In Episode 2, when Winona suffers a bout of depression, Wendy comes to cheer her up by painting her nails while listening to her talk about her day.

    Visual Novels 
  • 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.
  • Amane in Grisaia no Kajitsu 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 Grisaia no Rakuen 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.
  • Maji De Watashi Ni Koishinasai 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.
  • 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.
  • Kyou Fujibayashi from CLANNAD to her twin sister Ryou.

    Web Comics 
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

    Web Animation 
  • 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.
  • DSBT InsaniT: Whitney is towards her younger brother Bill, although their relationship isn't explored as deeply as her's and Dave's.
  • 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.

    Web Original 
  • 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.
  • 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.
  • 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.

    Western Animation 
  • Marceline has sometimes acted as a big sister figure toward Finn in Adventure Time.
  • Avatar: The Last Airbender: To some extent, Mai to Azula and Ty Lee. She's a year older than them and fits the aloof, snarky profile. Also, Katara to Toph, when they're not fighting or annoying each other.
  • Korra from The Legend of Korra is adored by all of Tenzin's children, and Ikki and Meelo often imitate her to their father's dismay (though it's made all the more amusing since Korra is the reincarnation of their grandfather).
  • Tilly Green from Big City Greens is very supportive of her younger brother Cricket and often provides him with advice or joins him on his misadventures.
  • Yumi Ishiyama from Code Lyoko. Johnny sure thinks that Hiroki has a Cool Big Sis.
  • Jazmine "Jazz" Fenton in Danny Phantom becomes this after the season 1 episode 'My Brother's Keeper'.
  • Doug's older sister Judy was both this and a Bratty Teenage Daughter at the same time. Judy is ostensibly considered one of the main antagonists of the series yet she gets plenty of heartwarming scenes with Doug. This is most likely the end result of Judy gaining new respect for Doug after he willingly gave back a large amount of cash to the old woman who lost it, even though the money was now legally Doug's.
  • DuckTales (2017):
    • Lena is this for the rest of the kids, but especially to her best friend Webby who describes her as "a noble teen ne'er-do-well who can break into anything, including your heart". She also embraces the role for Violet after being adopted into the Sabrewing family.
    • Huey, Dewey, and Louie's Missing Mom Della was described as being like this to everyone she met by her friend Selene. This ends up getting Played for Drama when she finally manages to reunite with her kids as having zero experience actually raising them causes her to act more like one of these than a mother, having trouble realizing the damage it could do.
  • Frankie acts as one to Mac in Foster's Home for Imaginary Friends to the point where people unfamiliar with the show have mistaken the two for siblings. Whatever the case, it's quite useful for a boy constantly bullied by his biological older brother to have someone else to look up to.
  • Wendy acts as a surrogate one to Mabel in Gravity Falls. This is best demonstrated in "Society of the Blind Eye" where she helps Mabel talk about her "Summer Romances" problem. Subverted with her and Dipper though, namely because she sees him as an equal friend and vice versa (though Dipper sees her more than a friend.)
    • Also played somewhat straight with Mabel, who is five minutes older and a millimeter taller than Dipper.
  • Grojband: Unlike Corey and Trina's relationship, Mina to Carrie seem to get along. However, Trina is implied to have once been this when Corey takes a Journey to the Center of the Mind and encounters a sweet, caring, and younger version of Trina named Katrina whom Trina locked away years ago.
  • Olga Pataki, the 20-year-old sister of Helga Pataki on Hey Arnold!. Not only does she get top grades, is a Valedictiorian, humanitarian and has her own trophy room, but she's gorgeous and tends to steal the lime light at any given second. Everyone adores her... except her sister. Their parents even love her more than Helga.
    • Not to mention that, despite having a good heart, poor Olga has terrible problems of her own. The fact that the Pataki parents dote on her so much has caused Olga to become a Stepford Smiler who collapses in tears at the slightest evidence that something may go wrong. As a result, while she plays this role to Lila and others who are outside the family, she and Helga are pretty distant — and sometimes Helga comes off as more mentally strong than Olga does.
  • Jerrica Benton of Jem plays this role for the kids at her orphanage and to her blood sister Kimber; the rest of the band are downplayed but present examples as well.
  • Flash from Justice League Unlimited considers Hawkgirl as one of these. In his words:
    "She loves me. She's like the big sister I never had. Only, y'know, short."
  • Kim Possible, actually the eponymous main character of her show.
    • Also, when her nemesis Shego was turned good and became her friend, Kim described her "like a big sister".
  • Les Sisters: Depending on the Writer, Wendy may be one of these to her younger sister Marine. She often helps her with her problems and gives her good advice.
  • The Loud House:
    • While Lincoln has five older sisters, it's Luna he seems to have the healthiest relationship with, and thus looks up to her.
    • However, Leni seems to be a close second. Usually.
    • Some of the sisters could also be considered this to each other:
      • Lori towards Leni (due to similar personalities and their relationship as best friends).
      • Lynn towards Lana (both roughhousing tomboys with similar interests and personalities).
      • Lori and Leni towards Lola (they are older versions of her).
      • Luan towards Lucy (both are interested in performance arts and Luan was a mentor to Lucy in "Head Poet's Anxiety").
      • All of the sisters towards Lily (multiple episodes about Lily tend to revolve around the sibling group as a whole making an effort to look after or help their youngest sister).
  • The Casagrandes:
    • Carlota is this to Ronnie Anne, comforting her when she is sad and speaking warmly and loving to her. "Yes My Dear".
  • Mike, Lu & Og: Mike is this to Lu and Og.
  • On Milo Murphy's Law, Sara seems to have escaped the Hereditary Curse that befell her brother Milo, but is incredibly close to him despite the very, very high chance that his presence will destroy whatever fun they try to have together.
    • Milo's old babysitter Veronica, introduced in "Secrets and Pies", has this relationship with him, insisting on personally delivering the pizza he's ordered and ruffling his hair while saying he earned the Awesome Backpack he inherited from her.
  • Stephanie is this on Moral Orel, particularly to the titular character.
  • Mike Chilton's older sister Capri in MotorCity.
  • Jenny to Tuck in My Life as a Teenage Robot.
  • My Little Pony: Friendship Is Magic:
    • Twilight Sparkle to Spike. At times, she comes off as a mother more than a sister though, since Spike has no separate maternal figure in Ponyville. Rainbow Dash also sees her old friend, Gilda the Griffon, as one. To her credit, Gilda does seem to care about her; the problem is that she doesn't care for anyone else. Ironically, it's revealed later that when Gilda and Rainbow Dash first met, it was the other way around—the young Gilda looked up to Rainbow Dash as one of these after the latter defended her from bullies.
    • Literal big sisters Applejack towards Apple Bloom, and (eventually) Rarity towards Sweetie Belle. This is explicitly invoked in "The Cutie Mark Chronicles".
      Scootaloo: We can start with the coolest pony in Ponyville...
      Apple Bloom: Applejack!
      Sweetie Belle: Rarity!
    • Pinkie Pie sometimes takes this role, trying to cheer up Apple Bloom or chaperoning foals on Nightmare Night.
      • And with the recent arrival of Mr. and Mrs. Cake's twin foals, Pinkie is now filling this role in a quite literal sense given that the Cakes seem to regard her as something of a foster daughter.
      • Subverted hilariously when she tries to act this way toward Fluttershy.
        Fluttershy: I'm a year older than you.
    • The couple whose wedding the Mane Six attend in the Season 2 finale, appropriately enough, both played this role for Twilight Sparkle when she was a foal: Shining Armor is her "B.B.B.F.F.note ," while Princess Cadance was her foalsitter (and apparently, "the best foalsitter in the history of foalsitters").
    • Subverted by Rainbow Dash. While the other members of the Mane Six are all pretty good with kids and fit this trope nicely, Word of God has revealed that the reason she wasn't given a younger sibling was because her occasional Jerkass tendencies probably wouldn't make her the best big sister. But then, nearly three seasons' worth of Character Development finally paid off in the events of "Sleepless in Ponyville," where she effectively becomes a big sister to Scootaloo!
      • She does still get occasional moments of this with other team mates however, especially to Fluttershy. When Gilda revealed her true colors and turned on Pinkie, she stood up for her (and all her other friends) as well.
      • All are pretty good with kids to some degree or another. Twilight is very responsible, seems to know a good deal about looking after children, and interacts very well with the kids in town, particularly the Cutie Mark Crusaders. Fluttershy doesn't have that much experience with kids, but her Friend to All Living Things status certainly gave her a leg up when the opportunity arose. Pinkie Pie and Applejack both seem to get along very well with kids, the former partially due to being similar to them. Rarity is a more questionable case, as the Cakes went to her last when looking for a foalsitter, even after Rainbow Dash!
    • Even before Sisterhooves Social, Rarity had been this to Sweetie Belle on her 5th birthday and... not what Sweetie Belle had thought in mind. Rarity entertained Sweetie Belle's guests to prevent them from leaving as they were waiting for the birthday girl to come down because Sweetie Belle was trying to look good for the birthday with dress, lipstick, and heels on. When one guest said that they don't need the absent birthday girl because of her older sister entertaining them, Rarity actually defends Sweetie Belle as she wants her birthday to go well. Unfortunately at that time, Sweetie Belle was overseeing this which made her go back to her bedroom crying and thought her sister upstaged her on purpose. This was part of her motivation in the plot of "For Whom the Sweetie Belle Toils" to sabotage a dress of one of Rarity's highest clients as payback for the dresses Rarity made overshadowing Sweetie Belle's play she worked hard on. It's also heavily implied that Luna, who was helping Sweetie Belle see the error of ways in her dreams, thought that way about Celestia.
    • It's obvious Princess Celestia adores Luna after she gets reverted from being Nightmare Moon, and Part 1 of "The Return of Harmony" confirms they were good friends before that (sharing the Elements of Harmony). In the Season 4 premiere, a flashback shows them doing just that: sharing the Elements of Harmony, to defeat Discord together.
  • Double Subverted with Candace in Phineas and Ferb. She normally is quite the opposite, but the boys still look up to and admire her and during the show she actually perform many cool things. Indeed, Phineas points out in "Summer Belongs To You" how she's always taken part in their adventures and done so many cool things: driving monster trucks, traveling through time, becoming the Queen of Mars, and so on. To them, she is that cool.
    • She could be considered this to Isabella (helping her sometimes in later seasons and special), even though they aren't actually related.
  • The Powerpuff Girls: Although all three sisters are the exact same age due to being created at the same time, Buttercup often behaves as one to Bubbles, or even to Blossom on occasion.
  • Jen on 6teen has a mean older sister everyone loves that she's jealous of.
  • Star Wars: The Clone Wars: Padmé's relationship with Ahsoka seems to be like this.
    • Ahsoka's relationship with the Jedi younglings in the Young Jedi story arc in the fifth season also seems to be like this, considering that she is their chaperone.
  • In Steven Universe, the appearance of a gem reflects what they think of themselves. While Pearl and Garnet appear as adults, Amethyst looks to be in her late teens. While this is reflected in her rebellious behavior, it's also because she is actually quite younger than Pearl and Garnet are. Her insecurities over belonging to the Gems (namely in that she was born in Earth and thus a product of the heinous operations the Homeworld Gems were doing) along with her own purpose allow her to bond more with Steven and they have a more casual reltationship. By the end of Season 3, she's also possibly the gem closest to him, despite Pearl and Garnet not lacking in important moments.
    • This also slightly applies when Amethyst and Garnet fuse into Sugilite. When she first appears in "Coach Steven" to wreck a Gem Control Tower, she first asks Steven if he "wants to see something cool." Steven then spends a good chunk of the episode thinking Sugilite is awesome, and wanting to be strong like her, much to Pearl's disapproval.
    • This bond between Steven and Amethyst, compared to him and the other Gems is what allows them to fuse to become Smokey Quartz while proving that Steven can fuse with Gems and humans (though unknown if at the same time.)
  • Subverted with Blackfire in the Teen Titans animated series. The other Titans think she's here to hang out with her little sis and maybe even join the team, but she's actually there to frame Starfire for a robbery she committed to get the authorities off her back. Heck, Starfire was excited to see her at first and didn't expect such treachery. This moment marked a Moral Event Horizon for Blackfire as Starfire wasn't at all happy to see her again.
    • In a similar vein to Katara and Toph, Starfire is this trope to Raven.
  • Total Drama Pahkitew Island has Jasmine act like this to Samey in order to make up for where Samey's actual older sister, Amy failed.
  • Arcee acts as this to Jack in Transformers: Prime, shifting into Mama Bear territory when he's threatened.
    • Windblade was this to Bumblebee in Transformers: Cyberverse. In the present, she serves as Bumblebee’s Big Brother Mentor, training him and teaching him about the Great War and his own past. As Bumblebee recovers, the two fall back into their original dynamic.
  • Winx Club: Flora to Miele (and an honorary one to Mirta), and Daphne to Bloom.
  • X-Men: Evolution
    • This rendition of Jean Grey, also a Type B Tsundere.
    • Tabitha Smith, aka Boom-Boom, really fits the bill after her Character Development.
    • Rogue to Nightcrawler, possibly; they never actually stated which of the two is older, though it seems to be Rogue.
  • Miss Martian becomes Beast Boy's adopted sister in season two of Young Justice. It doesn't hurt that she was the donor when he needed a blood transfusion in the first season, or that she modeled her human appearance on his mother, an actress who played the protagonist on a show that Miss Martian adored and based her persona off of.
    • Batgirl also gives off some of this air in her interactions with Robin III and Wonder Girl. She hugs Cassie after a successful mission and is usually paired with Robin for covert ops, including knocking him out of the way of attacks. When complaining about how all the other kids have mentors, Jaime includes Batgirl as one of Robin's.
  • Enid acts as one K.O. in OK K.O.! Let's Be Heroes.

    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.


Video Example(s):

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


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.

How well does it match the trope?

5 (1 votes)

Example of:

Main / CoolBigSis

Media sources:

Main / CoolBigSis