- In Origin Story, it turns out that from the beginning Wonder Man was never as supportive of the hunt for Alex Harris as Tony Stark thinks.
- In addition, Phil Coulson helps Alex Harris escape from SHIELD's clutches again and again without her ever knowing he's doing it.
- In the Peggy Sue fic, Rise of a New Moon, Luna manages to turn Jeremiah, Viletta, Euphie and Suzaku to her side and use them to wage a bloodless campaign to take over Japan.
Crossover
- In Ghosts of the Past, sequel of Child of the Storm, Gambit turns out to have been Natasha's mole in the Red Room. However, he only became this trope after a Heel–Face Turn (though, complicating matters further, he was never especially evil in the first place, having been forced into working for Sinister, who was working with the Red Room.)
- Sage, as per canon, though in this version, she had a secret identity: Maria Stark.
- Guardians, Wizards, and Kung-Fu Fighters (Jackie Chan Adventures & W.I.T.C.H.):
- Vathek is one for the Rebellion within Phobos' court, as per W.I.T.C.H. canon.
- Ludmoore's brothers are this for him within both Phobos' court and the Rebellion. Cedric is one of them, and the other, Cyrus, has a Secret Identity as Caleb's friend Drake.
- Jackie pretends to accept Chang's offer of service in order to bring the Dark Hand down from within. Later, he manages to flip Harold Hale to aid him, with plans by Section 13 to make him a Mole in Charge for the North American branch after Chang is taken down, in order to provide them the means to strike at the other branches. Except it turns out that Harold was a Dark Hand leader all along and was playing Jackie and Section 13.
- Count Cornelius serves as this for the Rebellion among the other nobles.
- Heroes of the New World; During the Kingdom of Doyle arc, it becomes apparent that while the Finalem Brothers are good, they're not that good and there was no way they could overthrow a heavily fortified Marine base and destroy a relief fleet without inside help. It's revealed that the commander of said base is a former noble of Doyle with a desire for the crown, and invited the pirates in to kill the other nobility and thus hand him the throne once the pirates themselves were disposed of.
- Son of the Seven Kingdoms:
- Tyrion decides to become this for William in the Lannister's army, because he knows that William is the legitimate heir to the throne — and pretty much the only person he can trust to use power the right way. Then, Tywin sends him to become Acting Hand, which pretty much means he will have the power to actually deal with the problems caused by Joffrey.
- Farengar Secret-Fire is one for the Blades with Daenerys, but he is aiding her in order to find a way to make peace between Targaryens and Baratheons.
- A Young Girl's Game of Thrones:
- Lum the redcloak is ordered by Cersei to spy on Myrcella, but she quickly turns him after he witnesses her kill an assassin because she scared him with her Troubling Unchildlike Behavior. The fact that she pays him and gives him financial advice solidifies his loyalty.
- Brienne was initially brought in to become Myrcella's sworn shield and to inform Renly of her comings and goings. This subterfuge ends during the Battle of The Tower of the Hand where Brienne reveals she's been spying, but reaffirms her vow as a sworn sword to keep her secrets for real this time.
- Cersei appoints three handmaidens for Myrcella. The only surprise is that they're not all this.
- In What Insertion?, Inuyasha tries to turn Sherry into a Mole within the Black Organization, intending to have her feed any information she can to Phibrizzo if she crosses paths with him. Sherry is understandably reluctant to do so, and it ultimately becomes moot weeks later when Gin tries to kill her for unrelated reasons.
- In Dance with the Demons, King Faraday offers to help Batman solve a case, but in reality he is attempting to luring Batman and the Outsiders into a trap set up by the Kobra cult. Unfortunately for him, Batman sees through his ruse.
- In Kira Is Justice, Shadow is one in the SIS, while Mr. Williams is partially an unwilling one in the Task Force (though this hadn't been put in play-yet.)
- Crowns of the Kingdom has the Queen of Hearts.
- In the fanfic Walking in Circles, after escaping Ostwick Circle, Evelyn becomes Solas' mole as Tranquil are always overlooked or ignored by other people and thus being perfect for spying duty. It should be noted that he didn't force her to do so and it was her suggestion in the first place since Tranquil hate, as much as they can, being idle.
Game of Thrones / A Song of Ice and Fire
- Chasing Dragons: Balon has one in Stannis' court, feeding him information that helps prepare for his rebellion. It's Euron, who is feeding him bad information, in order to set him up for a fall.
- Of Gold and Iron: Roose Bolton pretends to be allied with Robb Stark but is actually allied with Baelish and helped to kidnap Sansa.
- Becoming a True Invader: Pel has one among Tel's rebel Heboadians. It ultimately turns out to be Tel's Number Two, Stuart.
- Alternatively
: This story looks at the aftermath of events in the timeline where Steve fought with his other self to retrieve the Mind Stone; when studying the security tapes of Stark Tower, Steve and Tony realise the continued existence of HYDRA, and exploit the fact that the time-travelling Steve 'introduced' himself to Rumlow as a HYDRA agent to allow Steve to infiltrate HYDRA, posing as a loyal agent and even managing to get himself assigned as the Winter Soldier's handler, until he and Tony are ready to destroy HYDRA.
- Cat-Ra: Thanks to Catra making a far worse impression at the Princess Prom so that the Horde never has to show their true colors, Frosta teams up with them to infiltrate the Princess Alliance at the end of Season 1.
- In Mega Man Recut, "The Mega Man in the Moon" reveals that Senator King is this.
- In Mega Man: Defender of the Human Race, Metal Man is this in episode 9.
- The police and FBI suspect the Conduit may have planted a mole within their ranks. The mole turns out to be Captain Tallarico, AKA Miss T.
- In The Student Prince, Val, the bodyguard, is getting paid to kill Arthur. The surprise may be spoiled for readers who realise that "Val" is short for Valiant.
- Abraxas (Hrodvitnon): Ren Serizawa is working for Apex Cybernetics because he's actually keeping tabs on them on Monarch's behalf and learning what they're up to.
- The For the Want of a Nail Series features a different character as the traitor at UA in each fic, providing plenty of examples.:
- Mastermind: Strategist for Hire (and by extension, Mastermind: Rise of Anarchy) reveals Neito Monoma to be the traitor, feeding information to the League of Villains.
- The same fic also has Hawks serving as a mole within the League, much like canon, before he ends up defecting to them himself.
- Deku? I think he's some pro... is a notable exception - none of the characters are revealed to be the traitor over the course of the fic.
- Viridian: The Green Guide reveals Queen Bee to have been tasked by All for One to infiltrate UA. She possesses Tooru Hagakure to do so.
- Cheat Code: Support Strategist reveals Minoru Mineta to be the traitor, being tasked by All for One with finding Cheat Code's identity.
- Mastermind: Strategist for Hire (and by extension, Mastermind: Rise of Anarchy) reveals Neito Monoma to be the traitor, feeding information to the League of Villains.
- In Bloom in Winter, Izuku is forced by his father's boss, Vicious, to attend U.A. as a general education student and spy on all the teachers and students to find their weaknesses. They're particularly interested in finding All Might's weakness and the thought of doing this makes Izuku sick. But he can't resist for as long as his mom is held hostage by the organization.
- Loved and Lost: It's revealed in the 11th chapter that Prince Jewelius struck a partnership with Queen Chrysalis to invade Equestria together on Princess Cadance and Shining Armor's wedding day. He helped her sneak into Canterlot by telling her how to enter the caverns underneath the castle, and he lured Cadance into a trap, allowing Chrysalis to take her place. Absolutely nopony, not even Twilight, suspected him of anything foul. However, Jewelius decided that he'll gain more out of betraying Chrysalis and making Twilight his pawn, so he had Vivian help her and Cadance escape the caves to expose Chrysalis and aided Twilight in detaining the Changelings with the shrinking spell he showed her. However, he immediately afterwards pinned the blame for the invasion on all the other heroes and stole the throne.
- Guilt of Innocence: This is Sasuke's role in Otogakure, therefore rendering the whole "defecting the village in pursuit of power" an act. Tsunade assigns him the mission of spying on Orochimaru for Konoha seeing the latter is already interested in capturing Sasuke. By means of a special scroll, Sasuke passes on information about Orochimaru's experiments, plans, subordinates, and the location of his bases. More importantly, Sasuke gets some intel on Akatsuki.
- Kokuten: Itachi and Fukurou Uchiha are aligned to Konoha in the conflict but feign allegiance to the Uchiha Clan in order to act as this trope. Despite both of them belonging to ANBU, their motivations differ. Itachi mostly obeys the Hokage and the Konoha Council, but since the Sandaime is missing, he parts to get Konoha a new leader. Fukurou, on her part, reports to her ANBU captain, Kakashi, and helps Itachi as per Kakashi's request. She also leaks to him information about the Uchiha Clan's moves.
- Loyalty is a unique case that features a mole as its protagonist. And an unwilling one, at that. Sakura gets roped by Kabuto pre-time skip to spy on Konoha for him.
- in dreams you follow (but I dream in the dark) has Kiba infiltrating Akatsuki after faking his defection as a missing-nin to retrieve information for Konoha. Kiba had to publicly defect to make it believable and the series is both about Kiba in Akatsuki and the follow-out of his defection on his family and peers.
- True Potential: Itachi feeds intel on Akatsuki to Konoha (and unlike canon, we both get to see it and Konoha gains valuable knowledge on the enemy). However, the fact that Team Three was in Taki to warn them about Akatsuki trying to abduct Fu just when Kakuzu and Hidan were about to do that made them realize that it was too much of a Contrived Coincidence and that there's a traitor among them.
- HERZ: Did you think that Kaji working for three sides were overkill in the original series? Here he was working for four sides. When GEIST learnt about SEELE approached to him and made him an offer.
- Last Child of Krypton: Kaji worked for SEELE and NERV, but he was secretly working for a third party that intended to destroy both organizations.
- Neon Genesis Evangelion: Genocide: Maya was forced by Kluge to give him confidential information about the Evangelions and NERV.
- In Once More with Feeling, Shinji is feeding intelligence to the Japanese Government about what NERV and SEELE are really up to. However, given what they ARE up to, and what he is trying saving all humankind —including those he cares for—you would be hard-pressed to tell he is the bad guy here (and if they knew his motives, it's highly doubtful any character but Gendo and SEELE called him one). He is a good guy pretending to be a bad guy pretending to be a good guy.
- OSMU: Fanfiction Friction: After Basil Valentine expresses an interest to meet with Todd, the Mobile Unit and Oprah decide to send Todd in on behalf of Odd Squad to investigate the Enfant Terrible villain and his two henchwomen and find out what they're scheming. It almost disastrously fails when Basil manages to figure out what's going on and tries to cut open Todd as a result, but the salt that fellow agents O'Grady and Oz spread around the house stops them dead and causes the abandoned house they're meeting in to burn to the ground, killing Basil and his cronies but not Todd since he was rescued just in time. Todd is also initially hesitant about interacting with villains, fearing that it may trigger another Face–Heel Turn, but decides to go through with it for Odd Squad's sake.
- In Crimson Rising, the Power Rangers manage to get a reverse mole 'planted' in Sector Nine- a government organisation that has been monitoring and preparing to fight the Power Rangers since the destruction of the Thunderzords- in the form of the reformed Rito Revolto, now in a human appearance after the Z-Wave, allowing him to tip them off and prevent an assassination of the Vice-President staged to look like the Rangers did it.
- In Utopia Unmade, Nisser is one of the soldiers that gains Cure Marine's respect while she's organizing the defense of Sandstorm. Turns out he's actually Cobraja, one of the commanders of the Desert Apostles, and he manages to open Sandstorm's gates to let the Apostles in.
- The Return-Remixed: Gail Kim turns out to be this.
- Can One Change Fix All of RWBY?:
- Neopolitan a.k.a. Trivia is a huntress teacher at Beacon Academy, but is actually Ozpin's deep-cover agent.
- Leonardo Lionheart is Ozpin's mole in Salem's inner-circle, instead of vice versa.
- Children of Remnant: Klein pretends to be going along with the Schnees' plan to assassinate the Claimed, when in reality he's working for Cinder and telling her everything he knows.
- Blood and Honor: Quinn unwittingly acts as this for a large part of the story, studying Sanguis and secretly passing on information about her to Baras, unaware that Baras intends to kill her eventually. After she survives the trap Baras laid for her, Quinn is contacted again to help in a second attempt, triggering a personal crisis.
- Double Agent Vader is based on the concept of Darth Vader having a Heel–Face Turn years before A New Hope, and then beginning to feed information to the Rebellion in the hopes of bringing down Palpatine.
- Lorth Needa is later revealed to have turned on the Empire as well after Alderaan's destruction, since his wife was from there.
- The whole point of Wilhuff Tarkin, Hero of the Rebellion is having Tarkin as a founding member of what will become the Rebel Alliance while using his official position to sabotage the Galactic Empire, find more resources, and recruit others, including Galen Erso (who was already one, Tarkin just started coordinating with him), Raith Sienar, Gilad Pellaeon and Zsinj.
- In Faded Blue, Greg only comes across Rose Quartz - leader of the Crystal Gems, shatterer of Pink Diamond and Blue Diamond's enemy - by pure coincidence. He tried to keep his distance but Rose seems to be fascinated by him and quickly becomes friends. He then uses her as an unwitting informant in order to keep Steven and Blue Pearl safe, and later uses her to find Rose's fountain so that Lapis can heal her cracked gem.
- New Feelings: When Jade is first introduced in Chapter 7, she's been hired by her brother Peridot to kill Garnet to get back at Pearl. This only lasts for three chapters before Jade decides to move on following Pearl's engagement and subsequently makes a Heel–Face Turn.
- In A Pink Planet, Blue Diamond had planted an Aquamarine on Earth to spy on Pink Diamond's activities.
- Barricade in Things We Don't Tell Humans is actually an Autobot mole. And Megatron knows.
- In Turning Red: Secrets of the Panda, Howard Mitchell is revealed to be this to Jason Vaugn, acting as his top agent.
Unsorted
- AQUA: The First Step: Blake ends up becoming one to Alexander for the White Fang as part of an immunity deal. When she eventually decides to leave, Alexander pulls some strings to get her into Beacon.
- Cama Leonte of the Archbishop Guard is actually a Heretic spy in The Tainted Grimoire.
- The Child of Love: Kaji was a spy worked for at least three different sides: Gendo, SEELE and the Japanese Government. When it suited him, he turned on SEELE and then on Gendo.
- Doing It Right This Time: As soon as Asuka woke up in the past she passed information on Kaji secretely to warn him that the organization she was working for was plotting the end of the world.
- The Good Hunter has the architect of the Fall of Lescatie, Sasha Fullmoon. She is a hero of The Order who has been passing intelligence to Druella, Fourth Daughter of the Monster Lord.
- This trope is exaggerated in The Night Unfurls, due to the sheer number of characters, named or unnamed, count as this. One of Sir Kyril's tasks is to root out as many of these as possible. From Arc Villains like Beasley, Grishom, and Mandeville, to one-offs like Berol, Kyril and his company have proven to be highly effective in disposing of those who work for the Black Dogs in secret.
- The Pieces Lie Where They Fell: The sequel Picking Up the Pieces reveals that part of the Hidden Guard's duties include finding these and removing them. In chapter 15, Memorizing Gaze mentions that a few centuries before, when one of his ancestors was in charge, they had discovered a few Moles in the Guard who were working for an organized crime ring in order to make it easier for their associates to get away with their actions; the entire ring was swept up and arrested as a result.
- The Secret Return of Alex Mack: Clare Tobias is an NID mole in the Collective.
- In Unnatural Disaster Debonair is a Cauldron plant within Protectorate ENE, and high-ranking enough that unlike Battery he gets Door privileges.
- What About Witch Queen? has two heroic examples: Elsa sends Kristoff to be her mole in Berg's army, and mister Lee is Arendelle spy in Weselton court. Apparently, Berg knew from the beginning that "Christian Mikkeli" is a spy, but Lee remains undiscovered.
