History SecretKeeper / FanWorks

** ''Mare of Steel'': The rest of the Mane Six, Princess Celestia, and Rainbow Dash's mother Firefly become this for Dash when she becomes [[Franchise/{{Superman}} Supermare]]. [[spoiler: [[LoveInterest Thunderlane]] joins the list when he figures out her identity during her final fight with ComicBook/{{Brainiac}}.]]
*** In one of the side stories, she and [[Franchise/{{Batman}} Batpony]] become this for each other when he deduces her identity, and she uses her XRayVision to see that he's [[spoiler: the ''real'' Prince Blueblood (who was kidnapped and replaced by [[DiscOneFinalBoss Zod]]]].

[[AC:''Franchise/{{Batman}}'']]

** Dr. Douglas Dundee, the physician who delivered Bruce Wayne, knows Bruce's Franchise/{{Batman}} "because he had to patch him up so often".

* ''Fanfic/HellsisterTrilogy'': Fred and Edna Danvers know their daughter Linda is ComicBook/{{Supergirl}}, and they also know [[Franchise/{{Superman}} Clark Kent]]'s real identity. Fred thinks he is able to guess Franchise/{{Batman}}'s identity since he met him once, but Linda warns her father against getting too nosy.

'''Fred Danvers:''' I know who he is. And I know who you are. But are some of these guys and ladies around here, maybe, well--part of [[Franchise/JusticeLeagueOfAmerica the team]]?\\

'''Linda Danvers:''' Dad, I've gotta tell you. Whenever we think somebody's getting too curious, we have to take him to the guy from [[Franchise/GreenLantern Coast City]]. And the Coast City guy has to use that thing on his finger to go over your mind like a Disk Doctor over a hard drive, and purge out those curiosity bumps. After it was done, you wouldn't even remember everyone that was here.\\

[[AC:''Franchise/{{Supergirl}}'']]

** It becomes something of a plot point in the sequel, what with the nature of some of the secrets meaning that he really doesn't like having lie -- directly or by ExactWords -- to some of his friends.

** Homura forces Gabriel's secret identity out of Felix in the main timeline the story follows, and a result of killing Gabriel and taking his Miraculouses gets attacked by Cat Noir, which leads her to discovering he's Adrien. She keeps both identites to herself out of respect for Cat Noir. As a result of seeing the above and other timelines [[spoiler: thanks to Ultimate Madoka]], Homura also finds out Marinette's identity, confirming it [[spoiler: while the two are making a wish to drastically change reality to foil the Incubators and save Magical Girls]], keeping the knowledge of it afterwards.

* ''Fanfic/LastChildOfKrypton'': In the original story [[spoiler:Shinji reveals his identity to Asuka.]] In the rewrite [[spoiler:Fuyutsuki knows since the beginning. Asuka, Misato and Ritsuko find out later and keep it a secret.]]
* In ''Fanfic/LostInCamelot'', as of Chapter 47, Arthur, Gwen, Lancelot and Dyson are all aware (along with Gaius and Kenzi) of Bo, Merlin and Morgana's status as beings of magic living in Camelot as a triad relationship.

* ''Fanfic/MLPNextGenerationKnowFear'': Sunny Skies is the first pony to find out Starburst's SecretIdentity as the Fear Lantern, and agrees to stay quiet on it both out of respect to their friendship, and because she feels she owes Star for saving her life in Stalliongrad. [[spoiler:This ends up becoming a moot point when Starburst ends up outing herself as the Lantern while in her rush to save her mother.]]
* ''Fanfic/OriginStory'': Many people think they know Superwoman's SecretIdentity. She gets called "Karen Starr" all the time by various people. Thing is, Superwoman's real name isn't Karen Starr... its Alexandra Harris. Alex's domestic partner Louise and the members of ComicBook/{{Runaways}} function as Alex's Secret Keepers.

** The author feels that everyone at the South Pole who learned Danny's secret at the end of "Phantom Planet" became this, believing there were bigger secrets than what a fifteen year old boy did in his spare time.

** Months later (with [[LimaSyndrome the Horned King]] and [[MoralityPet Avalina]] having grown closer during that time), the lich and the girl stumble by chance upon Taran the pig-keeper and Princess Eilonwy (who are Avalina's friends) while being outdoors. The vengeful lich almost kills them, but Avalina [[GoThroughMe manages]] to change his mind and they depart. Taran and Eilonwy tell of this encounter to [[TheMentor Dallben]]. After gaining a confirmation from [[WaifProphet Hen]] [[NonHumanSidekick Wen]] about Avalina's account of the events leading there, the trio decides to remain silent for the same reasons as Avalina's family.

* In ''Fanfic/TheTwoSeers'', Dolores figures out that her uncle and cousin were living in the walls and ends up becoming a secret provider for the both of them. When Camilio has a run in with Mirabel, Dolores refuses to say anything about it to him.

* In''[[https://www.fanfiction.net/s/13381455/1/The-One-With-the-Butterfly-Effect The One With the Butterfly Effect]]'', Rachel becomes this for Monica and Chandler's relationship [[ForWantOfANail instead of Joey]]. However, she's only keeping the secret from Ross, Joey and Phoebe, to the extent that she admits that she told some of her work colleagues about the relationship, justifying herself on the grounds that her work friends don't know Chandler and Monica and won't care that much about it.

* In ''Fanfic/ThePowerOfSeven'', Demelza Robbins is chosen as the secret keeper for Harry's 'harem' of girls (Ginny, Hermione, Luna, Demelza, Susan Bones, Katie Bell and Fleur Delacour) because she's the least obvious choice as the apparent "weakest" of the girls even as they all trust her loyalty.

** The concept is completely {{Defied|Trope}} by Adrien, who has absolutely ''no respect'' for the concept of TheMasquerade. His sense of [[entitle|dToHaveYou]]ment towards his partner extends towards her SecretIdentity; no matter how many times Ladybug rejects his unwanted advances or reminds him that they ''need'' to remain unaware of each other's civilian identities for safety's sake, he continues [[SecretChaser doggedly pursuing any clues]].

** Near the climax of the story, Adrien appears to have learned from his mistakes, as he witnesses Ladybug entrusting somebody with a temporary Miraculous and doesn't ''immediately'' out them. Sadly, he soon proves that [[TheyJustDontGetIt he just doesn't get it]] when he complains to [[spoiler:his father Gabriel]], once again casually exposing their identity... as well as [[spoiler:unintentionally revealing that he WAS Chat Noir as well]]. [[spoiler:Gabriel]] then hits him with a blistering TheReasonYouSuckSpeech, noting how Ladybug likely has good ''reason'' not to trust him.

* In ''Fanfic/{{Spotless|GoldenEnderHawk}}'', Kagami finds out that Marinette is Ladybug when she detransforms in-front of her, not noticing Kagami in her room when she returned from a battle. Naturally, [[TheMasqueradeWillKillYourDatingLife Kagami is quick to fret and worry over Marinette being in danger]].

** The first of the titular letters was sent to Luka, and opened with Marinette confessing her SecretIdentity to him, as well as admitting that she was tired of being Ladybug and wanted out.

* ''[[Fanfic/ThreesACrowdNaruto Three's A Crowd]]'': Over time, Shikamaru, Ino and Chouji learn about how Sakura has been secretly studying overtime and teaching herself things they haven't learned at the Academy. Shikaku and Yoshino later catch her practicing [[spoiler:her own spin on Sunan puppetry techniques]], and encourage the kids to ''ensure'' they keep this hidden, as they don't want her attracting undue interest.

** In Chapter 28, Cross writes down all of his relevant knowledge for the Skypiea arc, knowing that he won't be able to speak freely while Enel is around. He asks Robin to help him out because she's the one with experience in being discreet when one slip-up could mean death, because her powers will help him write faster...and because she'd just use said powers to peek at his notes anyway.

* ''Fanfic/HellsisterTrilogy'': Fred and Edna Danvers know their daughter Linda is ComicBook/{{Supergirl}}, and they also know [[Franchise/{{Superman}} Clark Kent]]'s real identity. Fred thinks he is able to guess Franchise/{{Batman}}'s identity, since he met him once, but Linda warns her father against getting too nosy.

** Having known Jim since they were little, Toby has been this for Jim, Douxie and Barbara's status as wizards, becoming the TokenHuman for their nightly excursions.

* In ''[[https://archiveofourown.org/works/38701785/ Padawan's Return]]'', when Ahsoka Tano from the time of the Empire finds herself in the past during the events of ''Film/ThePhantomMenace'', the only two people she tells her true identity and origin are R2-D2 and Plo Koon, as she needed Artoo's help to establish a cover story and Plo's bond with her younger self meant that he could tell she wasn't just a Tortuga who shared the same name.

* In "[[https://www.fanfiction.net/s/7405386/1/My-Brother My Brother]]", before Harry starts at Hogwarts, only a few people are aware of the existence of Emma Lily Potter, Harry's little sister, born while the Potters were in hiding just two months before Voldemort killed James and Lily. Aside from the Marauders, Dumbledore, [=McGonagall=], and Hagrid, the only others who knew about Emma were Bathilda Bagshot who lived in the area, and Amelia Bones and Bartemius Crouch as they were the department heads who helped hide Emma in the first place. Ron and Hermione are the first students at Hogwarts to learn that Emma exists, followed by the rest of the Weasleys, before the rest of Hogwarts learns of Emma's existence at the Sorting.

** Lassoo and Funkfreed become this to Soundbite after the snail tells him what he witnessed: [[spoiler: that both Zoro and Nami find their dreams less worthy than Luffy's and Cross's, and that if they knew, the conflict would tear the crew apart.]]

* In ''Fanfic/Persona4SilverBlue'', [[spoiler: During the fight against Shadow Yosuke and Shadow Labrys, both Yosuke and Teddie learn the truth about Labrys’s past and they both swear to keep it a secret. At the time of this writing, they’re the only members of the Investigation Team who know about Labrys’s true nature]].

* In "[[https://archiveofourown.org/works/38701785/ Padawan's Return]]", when Ahsoka Tano from the time of the Empire finds herself in the past during the events of ''Film/ThePhantomMenace'', the only two people she tells her true identity and origin are R2-D2 and Plo Koon, as she needed Artoo's help to establish a cover story and Plo's bond with her younger self meant that he could tell she wasn't just a Tortuga who shared the same name.

* In "[[https://www.fanfiction.net/s/13381455/1/The-One-With-the-Butterfly-Effect The One With the Butterfly Effect]]", Rachel rather than Joey becomes this for Monica and Chandler's relationship. However, she's only keeping the secret from Ross, Joey and Phoebe, to the extent that she admits that she told some of her work colleagues about the relationship, justifying herself on the grounds that her work friends don't know Chandler and Monica and won't care that much about it.

** The concept is completely [[DefiedTrope defied]] by Adrien, who has absolutely ''no respect'' for the concept of TheMasquerade paired with a [[EntitledBastard sense of entitlement]] towards his partner's SecretIdentity, turning him into an ongoing threat to Ladybug's safety as he [[SecretChaser doggedly pursues any clues]].
** When Adrien thinks that Lady Wifi has exposed Ladybug as [[RichBitch Chloé]], he casually refers to her by her supposed real name, mocking the fact that she's been outed while offering to reveal himself as well. When she ducks into a closet to detransform, he camps out in front of it, complaining about how she shouldn't ''bother'' trying to hide anymore. It takes seeing Chloé outside while he knows Ladybug is still inside for him to realize his mistake... and [[DramaticallyMissingThePoint fixate on why everything seems to think]] Chloé would make a horrible hero.
** Adrien later takes this to whole new levels when Lila 'confides' in him, falsely claiming to be the Fox Heroine Volpina. Chat Noir then casually outs her [[spoiler:while she's being held hostage by an akuma]], cementing just how little he respects the concept and how little he cares for her safety. Lila is left with a ''serious'' grudge against Chat Noir for his carelessness.
** Near the climax of the story, he seems to have finally learned from his mistakes, as he witnesses Ladybug entrusting somebody with a temporary Miraculous and doesn't ''immediately'' out them. Sadly, he soon proves otherwise as he complains to [[spoiler:his father Gabriel]] about it, casually outing them in the process... and [[spoiler:unintentionally revealing that he WAS Chat Noir as well]].

* ''[[Fanfic/RecommencerMiraculousLadybug Recommencer]]'':

* In the ''Series/QuantumLeap''/''Series/StarTrekTheNextGeneration'' crossover ''[[https://www.fanfiction.net/s/1817822/1/All-That-Glitters All That Glitters]]'', when Sam leaps into Lieutenant Commander Data, Counsellor Deanna Troi realises that something has changed when she senses Sam’s emotions where Data should be incapable of feeling anything. Once she talks with Sam and establishes what has happened, Troi is able to offer Sam advice on how to pose as Data to the rest of the senior staff. Back in the past, Data is also given a full briefing on the nature of Project Quantum Leap, Al reasoning that there’s no concern about Data changing history given that he’s from the future and there’s no risk of him having any impact on the Project once he returns to his own time, to say nothing of him being able to offer vital aid in helping them work out what Sam might have been sent ot the future to change.

* ''Fanfic/ABriefHistoryOfEquestria'': Prior to the birth of Pansy's son Plow Blade, the only pony who knew about her relationship with the Earth Pony Trencher was her friend Shield Skin, who they even used as a secret messenger. This lasted for years, until Plow Blade's birth -- since he was an Earth Pony like his father, Pansy was forced to admit the truth, leading to [[OverprotectiveDad Hurricane trying to arrest and kill Trencher]], which kicked off [[MeleeATrois the Winter War]].

* In the ''Series/QuantumLeap''/''Series/StarTrekTheNextGeneration'' crossover ''[[https://www.fanfiction.net/s/1817822/1/All-That-Glitters All That Glitters]]'', when Sam leaps into Lieutenant Commander Data, Counsellor Deanna Troi realises that something has changed when she senses Sam’s emotions where Data lacks emotion. Once she talks with Sam and establishes what has happened, Troi is able to offer Sam advice on how to pose as Data to the rest of the senior staff. Back in the past, Data is also given a full briefing on the nature of Project Quantum Leap, Al reasoning that there’s no concern about Data changing history given that he’s from the future and there’s no risk of him changing anything by accident once he leaves.

** Snape, Sirius, and Tonks are the only ones to know where Harry escaped to.
** Later, when Harry returns to Hogwarts in disguise, Luna recognizes him at once ([[CloudCuckooLander somehow]]). Neville, Ginny, Fred, and George find out later when his disguise fails after he's exposed to a blast of raw magic during a fight. Later still, [[spoiler:Draco Malfoy]] identifies him by his flying skills, playing SecretSecretKeeper until he's finally pushed to confront Harry.

* In ''[[https://www.fanfiction.net/s/13381455/1/The-One-With-the-Butterfly-Effect The One With the Butterfly Effect]]'', Rachel rather than Joey becomes this for Monica and Chandler's relationship (although she's only keeping the secret from Ross, Joey and Phoebe, as she explicitly tells some of her work colleagues about the relationship on the grounds that they don't know Chandler and Monica and won't care that much about it).

** Vinnie, the human who has had irregular run-ins with the Manhattan Clan, meets Demona while assisting the Japanese clan during their visit to New York, and becomes one for her when he learns about her human identity and is given a job at Nightstone Enterprises.

* In ''[[https://www.fanfiction.net/s/7405386/1/My-Brother My Brother]]'', before Harry starts at Hogwarts, only a few people are aware of the existence of Emma Lily Potter, Harry's little sister, born while the Potters were in hiding just two months before Voldemort killed James and Lily. Aside from the Marauders, Dumbledore, [=McGonagall=], and Hagrid, the only others who knew about Emma were Bathilda Bagshot who lived in the area, and Amelia Bones and Bartemius Crouch as they were the department heads who helped hide Emma in the first place. Ron and Hermione are the first students at Hogwarts to learn that Emma exists, followed by the rest of the Weasleys, before the rest of Hogwarts learns of Emma's existence at the Sorting.
* In ''Fanfic/ThePowerOfSeven'', Demelza Robbins is chosen as the secret keeper for Harry's 'harem' of girls (Ginny, Hermione, Luna, Demelza, Susan Bones, Katie Bell and Fleur Delacour) because she's the least obvious choice.

* ''Fanfic/PetaParker'': For a while, [[spoiler:Deadpool and Vanessa]] where the only ones who knew the truth behind "Spider-Man".

* In ''Fanfic/ZToA'', out of all of the Avengers, the time-displaced Peter and Wanda only tell Steve Rogers the truth about exactly when in the future they come from before Thanos is defeated (they only tell Fury enough to confirm that they know about Carol).

* The original BSG fanfic, ''[[https://archiveofourown.org/works/183807|Flights of Angels]]'' has Boomer being the only person in the Fleet who knows Apollo and Starbuck are having an affair until the ending where their love is revealed.

** When Peta sensed the bomb about to go off, she was forced to reveal herself to be Morgan's favorite superhero when she saved her.

* ''Fanfic/FacingTheFutureSeries'';

* ''Fanfic/TwoButterfliesGoneWithTheWind'': Instead of kidnapping his niece, Bruno goes to Julieta and explains that Mirabel will be miserable in the future if she stays in Casita, and with her blessing and help he takes Mirabel away. Julieta then plays along when Alma informs her that her daughter and brother are missing.

* ''Fanfic/KimberlyTsGargoyles'';

* ''Fanfic/DaphneGreengrassAndTheBoyWhoLived'';

* ''Fanfic/RecommencerMiraculousLadybug'':

* ''Fanfic/{{Wonderful}}'': Before [[TheCape Wonder Red]] revealed her existence to the world and her SecretIdentity to the PRT, Emma and Sophia knew that she was Taylor Hebert.

----



* ''Fanfic/PetaParker'': For a while, [[spoiler:Deadpool and Vanessa]] where the only ones who knew the truth behind "Spider-Man".

* By the time Hiccup returns to Berk in ''Fanfic/ProdigalSon'', Astrid and Fishlegs already knew who he was.

* ''Fanfic/OriginStory'': Many people think they know Superwoman's SecretIdentity. She gets called "Karen Starr" all the time by various people. Thing is, Superwoman's real name isn't Karen Starr... its Alexandra Harris. Alex's domestic partner Louise and the members of ComicBook/{{Runaways}} function as Alex's Secret Keepers.


* ''Fanfic/{{SAPR}}'': Celestia has a conversation with Ozpin using Sunset's magic journal, and she quickly pegs him as an immortal due to him being so WiseBeyondHisYears. She promises not to tell Sunset or anyone else.


* In the first installment of ''Fanfic/SkyholdAcademyYearbook'', [[VideoGame/DragonAgeII Varric is this for Hawke]] regarding the real reason she's taken sabbatical from the eponymous school. Later, Cassandra takes on the role for Varric, after she accidentally stumbles across both the secret he's keeping for Hawke and the one he's keeping for himself.

* ''WebVideo/SuperTherapy'': Dr. Lynn Matthew knows most secret identities of her patients (not hard with Spider-Man considering he signs his checks with "Peter Parker"). Of course, she's tied up by doctor-patient confidentiality.
* ''Fanfic/SOE2LoneHeirOfKrypton'': Emil Hamilton to Asuka. Later, [[spoiler:Kaji and Shinji learn she is Supergirl.]] Asuka also [[spoiler:reveals her identity to Hikari.]]


* In ''Fanfic/TimeFixersNicktoonsOfTheFuture'' when [[BrainyBaby Max]] reveals that he is a genius like his parents, [=SpongeTron=] promises him that he will keep it a secret from everyone else.

* Yoriko from ''Manga/TokyoGhoul'' becomes this in any fanfic where she finds out Touka is a ghoul [[https://www.fanfiction.net/s/11143415/1/Stick-by-Me Pick]] [[https://archiveofourown.org/works/2417252 any]] [[https://archiveofourown.org/works/2316005 fanfic]].

* ''Fanfic/TravelsOfTheTrifecta'': There are two secrets being kept by both Paul and Conway after the two of them part ways in Chapter 10, and each of them has at least one Secret Keeper. [[spoiler:Candice and the Nurse Joy from Snowpoint City are the two people who know that Paul is terminally ill, and Maylene is the only person who knows that Conway is still alive and didn't die when he fell out of the helicopter.]]

* In ''Fanfic/TheWeaverOption'', Lankovar quickly identifies Gavreel as one of the Fallen but also determines he is a Loyalist. Given the Dark Angel Successor chapters would kill Gavreel regardless of his loyalty, Lankovar keeps the secret and helps arrange a cover identity.

* ''Fanfic/TheWizardAndTheHuntress'':
** Having known Jim since they were little, Toby has been this for Jim, Douxie and Barbara's status as wizards, becoming the TokenHuman for their nightly excursions.
** When Claire becomes the Trollhunter, Mary and Darci become this for her.

* ''Fanfic/{{Wonderful}}'': Before [[TheCape Wonder Red]] revealed her existence to the world and her SecretIdentity to the PRT, Emma and Sophia knew that she was Taylor Hebert.

* When he manages to guess the identity of Harry's father in ''[[https://www.fanfiction.net/s/8182529/1/Prince-of-Death Prince of Death]]'', Chiron decides to keep it secret and recommends that Harry to do the same, fearing that the kid would be ostracized and subjected to murder attempts if it were known he's a son of Hades.

* In ''[[Fanfic/TwiceUponAnAge All This Sh*t is Twice as Weird]]'', Victoria becomes this with regard to Cullen's DarkAndTroubledPast as a young Templar. The other Inquisition leaders know that he's deeply troubled by the way the Orlesians treated him at the Halamshiral ball, but she's the only one who knows ''why''. (It's implied that [[TheEmpath Cole]] also knows, but he won't speak of it to anyone but her.)

* ''Fanfic/BecomingLifprasir'': During Hiccup's time as "Cattongue", only a few people knew who he really was, including Thuggory, Heather and Camicazi. Eventually [[spoiler:Gobber catches him without his mask on in his old study at the forge and agrees to keep his secret, and Fishlegs and Astrid work it out on their own a few days later]].

* Ruby is this for Noel and Penny in ''Fanfic/BlazBlueAlternativeRemnant'', as she's the only other person who knows [[spoiler:their nature as Murakumo Units]] and has promised them she'd help keep it hidden.


* ''Fanfic/ChildrenOfRemnant'': Qrow and Clover clearly recognize [[spoiler:Neopolitan on her date with Emerald]] but decide to let them be for the sake of not causing a scene.

* In ''Fanfic/CodeGeassThePreparedRebellion'', Milly and her grandfather are two of the very few people who know Lelouch is Zero.

* ''Fanfic/DanceWithTheDemons'':
** Dr. Douglas Dundee, the physician who delivered Bruce Wayne, knows Bruce's Franchise/{{Batman}} "because he had to patch him up so often".
** James Gordon knows his daughter is ComicBook/{{Batgirl}}, but he's unaware of Batman's true identity (which Barbara knows, of course).
--->"I'm going to try to hook up with some of the others," she said. Gordon had learned years ago that his daughter was Batgirl, but the Batman's true identity was a mystery to him.


* ''Fanfic/DarkValkyrie'': The few people who see the slave brand on Hiccup are determined that no else finds out, since Hiccup could lose his status as heir if he did. His friends end up finding out anyway, and are determined to help him through it. They even come up with a plan to give him and themselves a tattoo to cover it up and make it less likely that anyone will figure it out.

* ''Fanfic/DoingItRightThisTime'': Sakura and Nozomi know about her brother and her middle sister (respectively) and other people being time-travelers and are keeping it secret... despite Sakura being very loud and indiscreet.

* ''Fanfic/ElementalChessTrilogy'': It is revealed that Maes Hughes was this for Roy Mustang and Riza Hawkeye, before and during the early part of the ''Manga/FullmetalAlchemist'' canon. Hughes, who was Mustang's best friend, was the only one who had absolute confirmation of the actual SecretRelationship between the two (though plenty of other people guessed).

* ''Fanfic/AForceOfFour'': Andrew Vinson knows his lover Karen Starr is ComicBook/PowerGirl's secret identity.

* In the ''VideoGame/FreedomPlanet'' fanfic ''Fanfic/LittleMissHeropants'', Lilac has [=PTSD=] from [[spoiler:Lord Brevon torturing her]] and Carol has to keep this a secret, especially from Milla.

* ''Fanfic/{{Girlfrenemies}}'': Raven accidentally blabs to Maddie and Dexter that her relationship with Apple is a lie to make royals and rebels get along. They agree not to tell anyone.

* ''Fanfic/AGrowingAffection'':
** The five Kages and the leaders of three Kekkei Genkai clans (one of which is Hiashi, the other two are unrevealed) hold the secret origins of bloodline traits.
** Tsunade and Jiraiya, with Kakashi and Shizune as backup, keep the secret of Naruto's father's identity.


* ''Fanfic/HarryPotterAndTheMysticForce'':
** Snape, Sirius, and Tonks are the only ones to know where Harry escaped to.
** Later, when Harry returns to Hogwarts in disguise, Luna recognizes him at once ([[CloudCuckooLander somehow]]). Neville, Ginny, Fred, and George find out later when his disguise fails after he's exposed to a blast of raw magic during a fight. Later still, [[spoiler:Draco Malfoy]] identifies him by his flying skills, playing SecretSecretKeeper until he's finally pushed to confront Harry.

* ''Fanfic/HellsisterTrilogy'': Fred and Edna Danvers know their daughter Linda is ComicBook/{{Supergirl}}, and they also know [[Franchise/{{Superman}} Clark Kent]]'s real identity. Fred thinks he is able to guess Franchise/{{Batman}}'s identity, since he met him once, but Linda warns her father against getting too nosy.
-->'''Fred Danvers''': I never thought he'd finally do it, Linda. But tell me something, will you?\\
'''Linda Danvers:''' What's that, Dad?\\
'''Fred Danvers:''' I know who he is. And I know who you are. But are some of these guys and ladies around here, maybe, well--part of [[Franchise/JusticeLeagueOfAmerica the team]]?\\
'''Linda Danvers:''' (innocently) What team is that, Dad?\\
'''Fred Danvers:''' You know what team. It'd be really fun if you took me up to shake hands with some of them. Now, it's not like I want to know which ones they are. But you know, I have met the Gotham guy. And I'll bet I could guess which one he is, if I tried. Is it kind of like the Mafia? Do you say, 'This is a friend of mine'?\\
'''Linda Danvers:''' Dad, I've gotta tell you. Whenever we think somebody's getting too curious, we have to take him to the guy from [[Franchise/GreenLantern Coast City]]. And the Coast City guy has to use that thing on his finger to go over your mind like a Disk Doctor over a hard drive, and purge out those curiosity bumps. After it was done, you wouldn't even remember everyone that was here.\\
'''Fred Danvers:''' Hmph. You guys used to have to go through such stupid stunts to keep your secrets secret.\\
'''Linda Danvers:''' That was before we met the guy from Coast City.

* In ''Fanfic/HopeForTheHeartless'' (which takes place shortly after the events of ''WesternAnimation/TheBlackCauldron''), the {{resurrected| For A Job}} [[VillainProtagonist Horned King]] imprisons a peasant girl named [[PluckyGirl Avalina]] -- who stumbles upon his castle during one stormy night -- to keep his return a secret from Prydain. He threatens to kill her and her loved ones should she try to escape, but grants her request to say the proper farewells to her family. During her short stay with her mother and brother, she asks them to keep everything a secret to prevent mass panic from erupting due to the Horned King's resurrection. They eventually agree reluctantly, realizing that they can't possibly do anything without potentially endangering Avalina's life.
** Months later (with [[LimaSyndrome the Horned King]] and [[MoralityPet Avalina]] having grown closer during that time), the lich and the girl stumble by chance upon Taran the pig-keeper and Princess Eilonwy (who are Avalina's friends) while being outdoors. The vengeful lich almost kills them, but Avalina [[GoThroughMe manages]] to change his mind and they depart. Taran and Eilonwy tell of this encounter to [[TheMentor Dallben]]. After gaining a confirmation from [[WaifProphet Hen]] [[NonHumanSidekick Wen]] about Avalina's account of the events leading there, the trio decides to remain silent for the same reasons as Avalina's family.


* In ''Fanfic/KaraOfRokyn'', Lois becomes Superman's secret keeper before their wedding.

* In ''Fanfic/KyonBigDamnHero'', [[spoiler:Rika and Kyon are this to each other]], [[spoiler:Miyoko/Miyokichi]] inadvertently became one, and Kyon's sister wants to become one.
** So far, quite a few members of the extended SOS Brigade trust Kyon's sister, but Kyon himself doesn't trust her.

* In the ''Franchise/MassEffect'' SelfInsert ''Fanfic/MassVexations'', Tali eventually becomes [[AuthorAvatar Art's]] secret keeper.
** He gets a lot more secret keepers in the sequel: as of the moment, Garrus, [[spoiler:Madison]], Thane, Kasumi, and Shala'Raan have all found out.

* In ''Fanfic/MegaManDefenderOfTheHumanRace'', [=ProtoMan=] is this for the fact that Nomad's alive.
** Cut Man, Guts Man, and Magnet Man are this for [=ProtoMan=] meeting with Nomad.

* In the ''Franchise/HarryPotter'' fic "[[https://www.fanfiction.net/s/7405386/1/My-Brother My Brother]]", before Harry starts at Hogwarts, only a few people are aware of the existence of Emma Lily Potter, Harry's little sister, born while the Potters were in hiding just two months before Voldemort killed James and Lily. Aside from the Marauders, Dumbledore, [=McGonagall=], and Hagrid, the only others who knew about Emma were Bathilda Bagshot who lived in the area, and Amelia Bones and Bartemius Crouch as they were the department heads who helped hide Emma in the first place. Ron and Hermione are the first students at Hogwarts to learn that Emma exists, followed by the rest of the Weasleys, before the rest of Hogwarts learns of Emma's existence at the Sorting.

* ''Series/{{Supergirl 2015}}'' fanfic ''Fanfic/MyYouthIsYours'': In college before they started dating, Lena was the first person Kara ever told about her alien nature. When Lena heard a new Kryptonian had saved a plane, she put two and two together before she even saw the pictures of Supergirl.

* After the protagonist of ''Fanfic/NeverBeenBothered'' learns that [[spoiler:Elsa and Anna are secretly sisters]], they promise not to tell anyone. It helps that they [[spoiler:suspected they were siblings as they look ''too'' similar to be unrelated somehow]].

* In ''Fanfic/ANewOrder'', Naru and Rei's Grandfather know Usagi and Rei are Sailor Moon and Mars, respectively.

* In the ''Series/{{Friends}}'' fic "[[https://www.fanfiction.net/s/13381455/1/The-One-With-the-Butterfly-Effect The One With the Butterfly Effect]]", Rachel rather than Joey becomes this for Monica and Chandler's relationship (although she's only keeping the secret from Ross, Joey and Phoebe, as she explicitly tells some of her work colleagues about the relationship on the grounds that they don't know Chandler and Monica and won't care that much about it).

* In ''Fanfic/PokemonResetBloodlines'', outside of his Pokémon, Ash has only shared his secret about the collapse in reality and the creation of the new timeline with Mewtwo and Casey Snagem. Sabrina also knows it, having figured it out herself by reading his mind without his knowledge, but doesn't seem interested in using it against him.
* In ''Fanfic/ThePowerOfSeven'', Demelza Robbins is chosen as the secret keeper for Harry's 'harem' of girls (Ginny, Hermione, Luna, Demelza, Susan Bones, Katie Bell and Fleur Delacour) because she's the least obvious choice.

* ''Fanfic/RecommencerMiraculousLadybug'':
** [[ReasonableAuthorityFigure Principal Achthoven]] knows about the Miraculi, recognizing Marinette as the current Ladybug. After privately revealing this to her, she helps provide cover for her SecretIdentity. Later on, she becomes one for [[spoiler:Madame Red and Qashr-Tari]] as well, having recognized them, and [[spoiler:after confronting Master Fu, selects a new Ox hero]].
** After [[spoiler:Adrien]] is given the Bee Comb, they contact Chloé in a panic, since her former identity as Queen Bee is well known. This naturally means that they're aware of Amellié's secret identity, which eventually leads to her learning that [[spoiler:he used to be Chat Noir]].
** PlayedWith through Alya. Lila falsely confides in her that she's Imperatrix, in order to leech off the new heroine's fame. [[spoiler:This comes back to bite her when Alya publicly accuses the ''real'' Imperatrix of being a fake, as that's the only way she can reconcile Imperatrix showing up while Lila's around.]]
* Naru from ''Manga/SailorMoon'' becomes this in any fanfic where she finds out Usagi is Sailor Moon. Examples include ''Fanfic/SailorMoonZ'' and ''Fanfic/BeautifulDestroyerSailorMoon''.

* ''Fanfic/SecondWind'': The only ones who know that Luffy and Zoro are time-travelers are people that they consider family.
** In Chapter 24, they tell Ace, who may later have informed [[spoiler:Sabo]] offscreen.
** In Chapter 26, Luffy and Zoro agree to let Ace inform Whitebeard of it.
** In Chapter 54, Luffy tells Garp, who privately swears to take the knowledge to his grave. Immediately afterward comes TheReveal to the rest of the Straw Hats.
*** Brook, the only one not present for The Reveal, finds out at the end of Chapter 60.
** In Chapter 62, Luffy informs Rayleigh and co., who then reveals the true history of the Roger Pirates to the crew in turn.

* In ''Fanfic/{{Spotless|GoldenEnderHawk}}'', Kagami finds out that Marinette is Ladybug when she detransforms in-front of her, not noticing Kagami in her room when she returned from a battle. Naturally, [[TheMasqueradeWillKillYourDatingLife Kagami is quick to fret and worry over Marinette being in danger]].
** When Peta sensed the bomb about to go off, she was forced to reveal herself to be Morgan's favorite superhero when she saved her.

* When he manages to guess the identity of Harry's father in ''[[https://www.fanfiction.net/s/8182529/1/Prince-of-Death Prince of Death]]'', Chiron decides to keep it secret and recommends that Harry to do the same, fearing that the kid would be ostracized and subjected to murder attempts if it were known he's a son of Hades.
* Nino in ''Fanfic/WontTellASoul'' serves this to Marinette/Ladybug and later to Adrien/Cat Noir.

* ''Fanfic/AllAssortedAnimorphsAUs'': In "What if Rachel's mom was a controller?", after Rachel tells Jordan and Sara the truth about the Yeerk invasion, Jordan in particular often helps to cover for her with Naomi.
* In the ''Series/QuantumLeap''/''Series/StarTrekTheNextGeneration'' crossover "[[https://www.fanfiction.net/s/1817822/1/All-That-Glitters All That Glitters]]", when Sam leaps into Lieutenant Commander Data, Counsellor Deanna Troi realises that something has changed when she senses Sam’s emotions where Data lacks emotion. Once she talks with Sam and establishes what has happened, Troi is able to offer Sam advice on how to pose as Data to the rest of the senior staff. Back in the past, Data is also given a full briefing on the nature of Project Quantum Leap, Al reasoning that there’s no concern about Data changing history given that he’s from the future and there’s no risk of him changing anything by accident once he leaves.
* In ''[[Fanfic/TwiceUponAnAge All This Sh*t is Twice as Weird]]'', Victoria becomes this with regard to Cullen's DarkAndTroubledPast as a young Templar. The other Inquisition leaders know that he's deeply troubled by the way the Orlesians treated him at the Halamshiral ball, but she's the only one who knows ''why''. (It's implied that [[TheEmpath Cole]] also knows, but he won't speak of it to anyone but her.)
* ''Fanfic/BackToUs'': In Chapter 24, Alya becomes one to Adrien after she runs into him when he's about to transform into Chat Noir.
* ''Fanfic/BecomingLifprasir'': During Hiccup's time as "Cattongue", only a few people knew who he really was, including Thuggory, Heather and Camicazi. Eventually [[spoiler:Gobber catches him without his mask on in his old study at the forge and agrees to keep his secret, and Fishlegs and Astrid work it out on their own a few days later]].
* Ruby is this for Noel and Penny in ''Fanfic/BlazBlueAlternativeRemnant'', as she's the only other person who knows [[spoiler:their nature as Murakumo Units]] and has promised them she'd help keep it hidden.
* ''Fanfic/ABriefHistoryOfEquestria'': Prior to the birth of Pansy's son Plow Blade, the only pony who knew about her relationship with the Earth Pony Trencher was her friend Shield Skin, who they even used as a secret messenger. This lasted for years, until Plow Blade's birth -- since he was an Earth Pony like his father, Pansy was forced to admit the truth, leading to [[OverprotectiveDad Hurricane trying to arrest and kill Trencher]], which kicked off [[MeleeATrois the Winter War]].
* ''Fanfic/TheChildOfLove'': At the beginning, very few people know Asuka is pregnant (Shinji, Misato, Rei, Ritsuko, Gendo, Fuyutsuki, Hikari) and they keep it secret.

* ''Fanfic/ChildrenOfRemnant'': Qrow and Clover clearly recognize [[spoiler:Neopolitan on her date with Emerald]] but decide to let them be for the sake of not causing a scene.
* In ''Fanfic/CodeGeassThePreparedRebellion'', Milly and her grandfather are two of the very few people who know Lelouch is Zero.
* ''Fanfic/DanceWithTheDemons'':
** Dr. Douglas Dundee, the physician who delivered Bruce Wayne, knows Bruce's Franchise/{{Batman}} "because he had to patch him up so often".
** James Gordon knows his daughter is ComicBook/{{Batgirl}}, but he's unaware of Batman's true identity (which Barbara knows, of course).
--->"I'm going to try to hook up with some of the others," she said. Gordon had learned years ago that his daughter was Batgirl, but the Batman's true identity was a mystery to him.

* ''Fanfic/DarkValkyrie'': The few people who see the slave brand on Hiccup are determined that no else finds out, since Hiccup could lose his status as heir if he did. His friends end up finding out anyway, and are determined to help him through it. They even come up with a plan to give him and themselves a tattoo to cover it up and make it less likely that anyone will figure it out.
* ''Fanfic/DoingItRightThisTime'': Sakura and Nozomi know about her brother and her middle sister (respectively) and other people being time-travelers and are keeping it secret... despite Sakura being very loud and indiscreet.
* ''Fanfic/ElementalChessTrilogy'': It is revealed that Maes Hughes was this for Roy Mustang and Riza Hawkeye, before and during the early part of the ''Manga/FullmetalAlchemist'' canon. Hughes, who was Mustang's best friend, was the only one who had absolute confirmation of the actual SecretRelationship between the two (though plenty of other people guessed).
* ''Fanfic/TheElementsOfHarmonyAndTheSaviorOfWorlds'': Celestia and King Spykoran are the only ones aware that [[spoiler: Spike is Spykoran's long-lost grandson]]. They agree to keep the secret for the time being, because [[spoiler: they can tell he's quite happy with Twilight]].
* ''Fanfic/AForceOfFour'': Andrew Vinson knows his lover Karen Starr is ComicBook/PowerGirl's secret identity.
* In the ''VideoGame/FreedomPlanet'' fanfic ''Fanfic/LittleMissHeropants'', Lilac has [=PTSD=] from [[spoiler:Lord Brevon torturing her]] and Carol has to keep this a secret, especially from Milla.
* ''Fanfic/{{Girlfrenemies}}'': Raven accidentally blabs to Maddie and Dexter that her relationship with Apple is a lie to make royals and rebels get along. They agree not to tell anyone.
* ''Fanfic/AGrowingAffection'':
** The five Kages and the leaders of three Kekkei Genkai clans (one of which is Hiashi, the other two are unrevealed) hold the secret origins of bloodline traits.
** Tsunade and Jiraiya, with Kakashi and Shizune as backup, keep the secret of Naruto's father's identity.

* ''Fanfic/HarryPotterAndTheMysticForce'':
** Snape, Sirius, and Tonks are the only ones to know where Harry escaped to.
** Later, when Harry returns to Hogwarts in disguise, Luna recognizes him at once ([[CloudCuckooLander somehow]]). Neville, Ginny, Fred, and George find out later when his disguise fails after he's exposed to a blast of raw magic during a fight. Later still, [[spoiler:Draco Malfoy]] identifies him by his flying skills, playing SecretSecretKeeper until he's finally pushed to confront Harry.
* ''Fanfic/HellsisterTrilogy'': Fred and Edna Danvers know their daughter Linda is ComicBook/{{Supergirl}}, and they also know [[Franchise/{{Superman}} Clark Kent]]'s real identity. Fred thinks he is able to guess Franchise/{{Batman}}'s identity, since he met him once, but Linda warns her father against getting too nosy.
-->'''Fred Danvers''': I never thought he'd finally do it, Linda. But tell me something, will you?\\
'''Linda Danvers:''' What's that, Dad?\\
'''Fred Danvers:''' I know who he is. And I know who you are. But are some of these guys and ladies around here, maybe, well--part of [[Franchise/JusticeLeagueOfAmerica the team]]?\\
'''Linda Danvers:''' (innocently) What team is that, Dad?\\
'''Fred Danvers:''' You know what team. It'd be really fun if you took me up to shake hands with some of them. Now, it's not like I want to know which ones they are. But you know, I have met the Gotham guy. And I'll bet I could guess which one he is, if I tried. Is it kind of like the Mafia? Do you say, 'This is a friend of mine'?\\
'''Linda Danvers:''' Dad, I've gotta tell you. Whenever we think somebody's getting too curious, we have to take him to the guy from [[Franchise/GreenLantern Coast City]]. And the Coast City guy has to use that thing on his finger to go over your mind like a Disk Doctor over a hard drive, and purge out those curiosity bumps. After it was done, you wouldn't even remember everyone that was here.\\
'''Fred Danvers:''' Hmph. You guys used to have to go through such stupid stunts to keep your secrets secret.\\
'''Linda Danvers:''' That was before we met the guy from Coast City.
* In ''Fanfic/HopeForTheHeartless'' (which takes place shortly after the events of ''WesternAnimation/TheBlackCauldron''), the {{resurrected| For A Job}} [[VillainProtagonist Horned King]] imprisons a peasant girl named [[PluckyGirl Avalina]] -- who stumbles upon his castle during one stormy night -- to keep his return a secret from Prydain. He threatens to kill her and her loved ones should she try to escape, but grants her request to say the proper farewells to her family. During her short stay with her mother and brother, she asks them to keep everything a secret to prevent mass panic from erupting due to the Horned King's resurrection. They eventually agree reluctantly, realizing that they can't possibly do anything without potentially endangering Avalina's life.
** Months later (with [[LimaSyndrome the Horned King]] and [[MoralityPet Avalina]] having grown closer during that time), the lich and the girl stumble by chance upon Taran the pig-keeper and Princess Eilonwy (who are Avalina's friends) while being outdoors. The vengeful lich almost kills them, but Avalina [[GoThroughMe manages]] to change his mind and they depart. Taran and Eilonwy tell of this encounter to [[TheMentor Dallben]]. After gaining a confirmation from [[WaifProphet Hen]] [[NonHumanSidekick Wen]] about Avalina's account of the events leading there, the trio decides to remain silent for the same reasons as Avalina's family.
* ''Fanfic/InfinityTrainBlossomingTrail'': While her status as the resident NightmareFetishist was known (and mocked) by her classmates, Chloe's aspirations of becoming a horror novelist was a secret to everyone but her younger brother, Parker, who constantly begged to read her short stories. Her father's lab assistants [[SecretSecretKeeper also turn out to have been aware]] that she at least writes such content for stress relief, but never told him because they didn't think the warning signs hidden within said works were all that important.
* ''Fanfic/JusticeLeagueOfEquestria'':
** ''Mare of Steel'': The rest of the Mane Six, Princess Celestia, and Rainbow Dash's mother Firefly become this for Dash when she becomes [[Franchise/{{Superman}} Supermare]]. [[spoiler: [[LoveInterest Thunderlane]] joins the list when he figures out her identity during her final fight with ComicBook/{{Brainiac}}.]]
*** In one of the side stories, she and [[Franchise/{{Batman}} Batpony]] become this for each other when he deduces her identity, and she uses her XRayVision to see that he's [[spoiler: the ''real'' Prince Blueblood (who was kidnapped and replaced by [[DiscOneFinalBoss Zod]]]].
* In ''Fanfic/KaraOfRokyn'', Lois becomes Superman's secret keeper before their wedding.
* In ''Fanfic/KyonBigDamnHero'', [[spoiler:Rika and Kyon are this to each other]], [[spoiler:Miyoko/Miyokichi]] inadvertently became one, and Kyon's sister wants to become one.
** So far, quite a few members of the extended SOS Brigade trust Kyon's sister, but Kyon himself doesn't trust her.
* ''Fanfic/LastChildOfKrypton'': In the original story [[spoiler:Shinji reveals his identity to Asuka.]] In the rewrite [[spoiler:Fuyutsuki knows since the beginning. Asuka, Misato and Ritsuko find out later and keep it a secret.]]
* ''Fanfic/LeaveForMendeleiev'': Completely [[DefiedTrope Defied]] by Adrien, who has absolutely ''no respect'' for the concept of TheMasquerade at all beyond using Chat Noir as a chance to flirt and screw around away from his father's control. When he thinks that Lady Wifi has outed [[RichBitch Chloé]] as Ladybug, he casually refers to his partner by her civilian name, offers to reveal himself to her as well, and camps outside of the closet she ducks into to detransform while complaining about how she shouldn't have to ''bother'' trying to hide anymore. Later on, he takes this disrespect to whole new levels -- Lila falsely confides in Adrien that she's the Fox Heroine Volpina, only for him to casually out her [[spoiler:''while she's being held hostage by an akuma'']]. His complete lack of regard for keeping secrets ''secret'' makes clear that he can't be trusted, though this doesn't stop him from [[SecretChaser feeling entitled to Ladybug's]] SecretIdentity and anything else she might know.
** Near the climax of the story, he seems to have finally learned from his mistakes, as he witnesses Ladybug entrusting somebody with a temporary Miraculous and doesn't ''immediately'' out them. Sadly, he soon proves otherwise as he complains to [[spoiler:his father Gabriel]] about it, casually outing them in the process... and [[spoiler:unintentionally revealing that he WAS Chat Noir as well]].
** Heroes in ''The Legend of Royal Blue and La Sylphide'' aren't as adept at hiding their identities. Emilie's OldRetainer Simone recognizes La Sylphide after hearing her voice, and Gabriel detransforms in his room before seeing his classmate Julien Bonheur had let himself in. The two of them are glad to provide alibis and moral support when needed, and sharing the secret helps Gabriel and Julien develop a real friendship.
* ''Fanfic/TheManyDatesOfDannyFenton'': Occasionally Danny has discovered the double lives of his dates and promises to keep their secret safe.
* In the ''Franchise/MassEffect'' SelfInsert ''Fanfic/MassVexations'', Tali eventually becomes [[AuthorAvatar Art's]] secret keeper.
** He gets a lot more secret keepers in the sequel: as of the moment, Garrus, [[spoiler:Madison]], Thane, Kasumi, and Shala'Raan have all found out.
* In ''Fanfic/MegaManDefenderOfTheHumanRace'', [=ProtoMan=] is this for the fact that Nomad's alive.
** Cut Man, Guts Man, and Magnet Man are this for [=ProtoMan=] meeting with Nomad.
* One of the biggest changes in ''Blog/MiraculousRewrite'' is that the heroes are permitted to select somebody to serve as their official confidant, allowing them to reveal their SecretIdentity to them. Marinette chooses Alya as hers; Adrien picks Nino.

* ''Fanfic/MLPNextGenerationKnowFear'': Sunny Skies is the first pony to find out Starburst's SecretIdentity as the Fear Lantern, and agrees to stay quiet on it both out of respect to their friendship, and because she feels she owes Star for saving her life in Stalliongrad. [[spoiler: This ends up becoming a moot point when Starburst ends up outing herself as the Lantern while in her rush to save her mother.]]
* In the ''Franchise/HarryPotter'' fic "[[https://www.fanfiction.net/s/7405386/1/My-Brother My Brother]]", before Harry starts at Hogwarts, only a few people are aware of the existence of Emma Lily Potter, Harry's little sister, born while the Potters were in hiding just two months before Voldemort killed James and Lily. Aside from the Marauders, Dumbledore, [=McGonagall=], and Hagrid, the only others who knew about Emma were Bathilda Bagshot who lived in the area, and Amelia Bones and Bartemius Crouch as they were the department heads who helped hide Emma in the first place. Ron and Hermione are the first students at Hogwarts to learn that Emma exists, followed by the rest of the Weasleys, before the rest of Hogwarts learns of Emma's existence at the Sorting.
* ''Series/{{Supergirl 2015}}'' fanfic ''Fanfic/MyYouthIsYours'': In college before they started dating, Lena was the first person Kara ever told about her alien nature. When Lena heard a new Kryptonian had saved a plane, she put two and two together before she even saw the pictures of Supergirl.
* After the protagonist of ''Fanfic/NeverBeenBothered'' learns that [[spoiler:Elsa and Anna are secretly sisters]], they promise not to tell anyone. It helps that they [[spoiler:suspected they were siblings as they look ''too'' similar to be unrelated somehow]].
* In ''Fanfic/ANewOrder'', Naru and Rei's Grandfather know Usagi and Rei are Sailor Moon and Mars, respectively.

* In the ''Series/{{Friends}}'' fic "[[https://www.fanfiction.net/s/13381455/1/The-One-With-the-Butterfly-Effect The One With the Butterfly Effect]]", Rachel rather than Joey becomes this for Monica and Chandler's relationship (although she's only keeping the secret from Ross, Joey and Phoebe, as she explicitly tells some of her work colleagues about the relationship on the grounds that they don't know Chandler and Monica and won't care that much about it).
* ''Fanfic/PetaParker'': For a while, [[spoiler:Deadpool and Vanessa]] where the only ones who knew the truth behind "Spider-Man".
* In ''Fanfic/PokemonResetBloodlines'', outside of his Pokémon, Ash has only shared his secret about the collapse in reality and the creation of the new timeline with Mewtwo and Casey Snagem. Sabrina also knows it, having figured it out herself by reading his mind without his knowledge, but doesn't seem interested in using it against him.
* In ''Fanfic/ThePowerOfSeven'', Demelza Robbins is chosen as the secret keeper for Harry's 'harem' of girls (Ginny, Hermione, Luna, Demelza, Susan Bones, Katie Bell and Fleur Delacour) because she's the least obvious choice.
* ''Fanfic/PredatorAndPrey'': Geoff, Noah, Leshawna, Gwen, Trent, Justin, and Heather are the only people who know that Bridgette was sexually abused and raped by Alejandro during ''Total Drama World Tour'', and they have all agreed with her to not reveal this to anyone to protect Bridgette. As a result, Alejandro is still merely seen as a FauxAffablyEvil ManipulativeBastard by the show and everyone else rather than the incredibly depraved sexual predator he is off-camera and in reality.
* By the time Hiccup returns to Berk in ''Fanfic/ProdigalSon'', Astrid and Fishlegs already knew who he was.
* ''Fanfic/OriginStory'': Many people think they know Superwoman's SecretIdentity. She gets called "Karen Starr" all the time by various people. Thing is, Superwoman's real name isn't Karen Starr... its Alexandra Harris. Alex's domestic partner Louise and the members of ComicBook/{{Runaways}} function as Alex's Secret Keepers.
* ''Fanfic/RecommencerMiraculousLadybug'':
** [[ReasonableAuthorityFigure Principal Achthoven]] knows about the Miraculi, recognizing Marinette as the current Ladybug. After privately revealing this to her, she helps provide cover for her SecretIdentity. Later on, she becomes one for [[spoiler:Madame Red and Qashr-Tari]] as well, having recognized them, and [[spoiler:after confronting Master Fu, selects a new Ox hero]].
** After [[spoiler:Adrien]] is given the Bee Comb, they contact Chloé in a panic, since her former identity as Queen Bee is well known. This naturally means that they're aware of Amellié's secret identity, which eventually leads to her learning that [[spoiler:he used to be Chat Noir]].
** PlayedWith through Alya. Lila falsely confides in her that she's Imperatrix, in order to leech off the new heroine's fame. [[spoiler:This comes back to bite her when Alya publicly accuses the ''real'' Imperatrix of being a fake, as that's the only way she can reconcile Imperatrix showing up while Lila's around.]]
* Naru from ''Manga/SailorMoon'' becomes this in any fanfic where she finds out Usagi is Sailor Moon. Examples include ''Fanfic/SailorMoonZ'' and ''Fanfic/BeautifulDestroyerSailorMoon''.
* ''Fanfic/{{SAPR}}'': Celestia has a conversation with Ozpin using Sunset's magic journal, and she quickly pegs him as an immortal due to him being so WiseBeyondHisYears. She promises not to tell Sunset or anyone else.
* ''Fanfic/SecondWind'': The only ones who know that Luffy and Zoro are time-travelers are people that they consider family.
** In Chapter 24, they tell Ace, who may later have informed [[spoiler:Sabo]] offscreen.
** In Chapter 26, Luffy and Zoro agree to let Ace inform Whitebeard of it.
** In Chapter 54, Luffy tells Garp, who privately swears to take the knowledge to his grave. Immediately afterward comes TheReveal to the rest of the Straw Hats.
*** Brook, the only one not present for The Reveal, finds out at the end of Chapter 60.
** In Chapter 62, Luffy informs Rayleigh and co., who then reveals the true history of the Roger Pirates to the crew in turn.
* In the first installment of ''Fanfic/SkyholdAcademyYearbook'', [[VideoGame/DragonAgeII Varric is this for Hawke]] regarding the real reason she's taken sabbatical from the eponymous school. Later, Cassandra takes on the role for Varric, after she accidentally stumbles across both the secret he's keeping for Hawke and the one he's keeping for himself.
* In ''Fanfic/{{Spotless|GoldenEnderHawk}}'', Kagami finds out that Marinette is Ladybug when she detransforms in-front of her, not noticing Kagami in her room when she returned from a battle. Naturally, [[TheMasqueradeWillKillYourDatingLife Kagami is quick to fret and worry over Marinette being in danger]].
** When Peta sensed the bomb about to go off, she was forced to reveal herself to be Morgan's favorite superhero when she saved her.
* ''WebVideo/SuperTherapy'': Dr. Lynn Matthew knows most secret identities of her patients (not hard with Spider-Man considering he signs his checks with "Peter Parker"). Of course, she's tied up by doctor-patient confidentiality.
* ''Fanfic/SOE2LoneHeirOfKrypton'': Emil Hamilton to Asuka. Later, [[spoiler:Kaji and Shinji learn she is Supergirl.]] Asuka also [[spoiler:reveals her identity to Hikari.]]

** Garp promises to keep the secret that [[spoiler: Perona]], the newest Warlord of the Sea, is actually a close ally of the Straw Hat Pirates.

* ''Fanfic/TravelsOfTheTrifecta'': There are two secrets being kept by both Paul and Conway after the two of them part ways in Chapter 10, and each of them has at least one Secret Keeper. [[spoiler: Candice and the Nurse Joy from Snowpoint City are the two people who know that Paul is terminally ill, and Maylene is the only person who knows that Conway is still alive and didn't die when he fell out of the helicopter.]]