[[AC: Manga/AhMyGoddess]]
* From the fic Ah! Archfall: you can do what you like to Jago, but you insult or threaten Lind, their unborn child or either of his Archs, and the very least he'll do is beat you senseless. And if you force him to summon Papa Jupiter to do it, he WILL kill you.

[[AC: Manga/AttackOnTitan]]

* Corporal Levi in [[https://www.fanfiction.net/s/10156375/1/My-Child My Child,]] to his and Mikasa's unborn child. In order to save the child from [[DeathByChildbirth dying in childbirth]], Levi [[spoiler: makes a [[DealWithTheDevil deal with the demon]] that has been hounding him the whole story to sell his soul for their safety. The baby is born healthy and safe, but Levi is dragged to hell to be tortured by the demon for all eternity in exchange. However, the knowledge that his son Rivahn is safe is the only thing that keeps him from regretting it.]]

[[AC: Franchise/TheAvengers]]
* Avengers fanfiction has a ton of examples where Hulk gets mighty protective over Clint/Hawkeye, but none more so than [[http://www.fanfiction.net/s/8164275/1/Big-Green-Guardian-Angel Big Green Guardian Angel]]. The biggest scene in the one-shot was when Clint, after accidentally exposing the scars on his torso, explains that he got them as a kid, causing Banner to Hulk out right then and there. As if that wasn't "aww" eliciting enough, Hulk stopped his rampage enough to trace Clint's scars, whimper a little, and proceed to destroy everything in sight as a result of his rage.
* Hawkeye becomes this to a de-aged agent Coulson in [[http://archiveofourown.org/works/773197 this story]].
** Note that this story is an inversion of the FandomSpecificPlot in Avengers fanfic where all the Avengers get de-aged and Coulson has to babysit them. Such stories usually depict Coulson as the PapaWolf TeamDad.
* ''Loki'', of all people, becomes this to his adopted daughter in the fic ''[[https://www.fanfiction.net/s/8535624/1/Mischief-Lies-and-Other-Hazards-of-Parenting Mischief, Lies, and Other Hazards of Parenting]]'' and its sequel, ''[[https://www.fanfiction.net/s/8643002/1/Thor-s-Days Thor's Days]]''. In the first he practically ''bolts'' to the park where she's having her birthday party when he thinks its being attacked by Dr. Doom (it wasn't), and in the second he almost snaps her scout leader's neck when she's injured due to said scout leader's incompetence (Tony intervened that time). And then in one chapter, Natasha comes to him and makes a hint that Clint might go near the girl. Loki's response is scary.
-->'''Loki''': I will, however, show no mercy to anyone, and by anyone I mean your dear Agent Barton, who chooses to strike at me through her.
-->'''Natasha''': So if Clint takes Kara, you'll kill him?
-->'''Loki''': Has my dear brother ever told you how he and I would sneak into the orchards of the goddess Idunn when we were children? Those apples, which I was so very good at stealing, grant whoever eats them a very long, very resilient life. If your little friend does anything to Kara, I will find a way into Asgard and strip Idunn's orchard bare. I'll cram them down his throat and save enough for you, so you can watch as I torture him for eternity. No matter how much either of you beg me to kill him, he'll live through every length of gut ripped through his flesh, every severed limb, and every drop of acid spilling into his eye. Now is my meaning clear?

[[AC: Franchise/BackToTheFuture]]
* In the fic ''FanFic/BackToTheFuturePrequel'', Marty is kidnapped by a vengeful enemy of Doc's, who throws him into an icy lake to drown. Doc subdues the physically bigger enemy and swims two hundred feet to save Marty.

[[AC: Franchise/{{Batman}}]]
* From Franchise/{{Batman}} fic ''[[http://www.fanfiction.net/s/6653515/1/Antidote_for_the_Poison Antidote for the Poison]]'', Jason Todd in a rare moment of [[BigBrotherInstinct brotherly concern]] is furious when he finds out that some drug dealer had injected Tim Drake with a dangerous amount of heroin as an attack against Batman.
--> "You took my little brother, tied him up, pumped him full of heroin, and left him to die in this shit hole. Now I ask you: do you think I have the slightest bit of remorse about cutting you open and letting your guts decorate the floor?"
* Pretty much every fanfic that has Batman/Bruce Wayne adopting a child has at least once instance where the child gets in trouble and Batman will come to the child's rescue.

[[AC: Disney/TheBlackCauldron]]
* In ''Fanfic/HopeForTheHeartless'', [[VillainProtagonist the Horned King]] slowly [[LimaSyndrome becomes]] this for [[MoralityPet Avalina]], especially after he [[DeclarationOfProtection swears]] to himself to protect her.

[[AC: WesternAnimation/CodeLyoko]]
* In [[https://www.fanfiction.net/s/3926249/1/Growing-Family Growing Family]], Jeremie reacts violently to his and Aelita's daughter Anya's request of going to Lyoko and when Odd muses on teaching her to be a troublemaker, threatens to ''leave him in virtual limbo'' if he corrupts Anya. Odd [[NightmareFuel reacts with appropriate terror.]]

[[AC: Series/CriminalMinds]]
* In ''To live again'' if you mess with Annie, Gideon AND Rossi will end you. In general - you don't go after the BAU's children unless you have a death wish.

[[AC: {{Crossover}}]]
* Tony Stark becomes this to his adopted son Harry in the ''Literature/HarryPotter''/''IronMan'' crossover fanfic ''Fanfic/HarryPotterAndTheInvincibleTechnomage''. It is also demonstrated that many of the heroes feel this way toward their allies' children.
** Thor gets a CrowningMomentOfAwesome (that doubles as CrowningMomentOfFunny) when the Ministry of Magic tries to take Harry away from Tony: Thor breaks in and calmly warns the Wizengamot that voting for taking Harry away would cause Thor to tear down the building and break every single bone of every member of the Ministry. Harry then gets him to amend it into only tearing down the building and breaking the bones of everyone who voted yes (the rest of the Ministry people are innocent, and the Aurors that would try and fail to stop him are merely doing their job). The Wizengamot promptly vote to leave Harry with Tony.
* Harry shows tendencies towards this in ''Fanfic/TheWizardInTheShadows'', with generally whatever has been stupid enough to push the BerserkButton of hurting his friends being fried or straight up vaporised and a crater the size of a soccer pitch being left behind.
** [[MeaningfulName Emrys]] [[EmpoweredBadassNormal Ap]] [[OriginalCharacter Derfel]] also has this, though it's little brother wolf in his case. [[RelativeButton Don't hurt his sister.]] If you do, you are officially TooDumbToLive and [[YouAreAlreadyDead can consider yourself already on a one way trip to Dead Meat County]].
* ''Fanfic/ChildOfTheStorm'' has a number of these, most notably Thor. He has so far terrified the Dursleys and only narrowly restrained himself from incinerating them (because what Tony had planned was more humiliating and excruciatingly painful), Snape, explaining exactly who he is, what he is capable of and what he will do if Snape even ''looks'' the wrong way at Harry and sent [[HumanoidAbomination Gravemoss]] running for his life with one shot after Thor caught up with him (because Gravemoss had orchestrated Harry's kidnapping by [[spoiler: the Disir]]. While Harry managed to IndyPloy his way out of trouble, Thor was Not Pleased). Gravemoss, bear in mind, is a PhysicalGod who had previously [[spoiler: killed]] Sif with minimal effort [[spoiler: she got better]], regarded losing an arm as a mild annoyance (he grew it back) and tanked [[spoiler: Harry Dresden's [[CastFromHitPoints Death Curse]]]], which had blasted him over 500 miles from Paris to the North Sea, as well as being a mystical powerhouse on par with Loki. Thor sent him running.
** Odin. He may have made mistakes, but holy crap, you do not want to be in Thanos' shoes when the Allfather catches up to him, not after what happened to Loki (while Loki's madness was his own and, as acknowledged by Loki himself, his responsibility, Thanos was not exactly kind to him).
*** In a direct example, when [[spoiler: Chthon]], an Elder God, threatens his family in chapter 77, the response [[TheWrestlerInAllOfUs is a simplified Facebuster.]]
** The Avengers in general are this to Harry, even after he becomes more than capable of looking after himself. Loki does not take kindly to the thought of his nephew being interfered with, warning Albus Dumbledore that while he, Loki, notes and approves of his plans, he had better tread carefully where Harry is concerned. Clint treats Harry like a little brother and when he's kidnapped, says that he wants to teach Harry to shoot. And he will. With a practical demonstration. And the Hulk... well. He likes Harry. As Bruce puts it, 'We will find Harry. And Hulk will smash.'
** Albus Dumbledore is this to his students. Hurt one of them and you will find out why this man is the most powerful wanded wizard on the planet.
** Magneto. He loves his daughter and while he is nominally good, [[PhysicalGod he is an Omega Class mutant]] and [[GoodIsNotNice everyone]] [[GoodIsNotSoft with]] [[TooDumbToLive a brain]] [[TheDreaded is absolutely terrified of him.]]
** We don't know much about [[WildCard Stephen Strange.]] But one of the things we do know is that when the White Council came for Wanda, whose magic and powers had been going haywire, after they judged her too dangerous to live, he challenged them to a duel. ''All'' of them. This is an organisation numbering about two thousand Wizards, the most powerful 1% of wandless practitioners on the planet, led by the seven members Senior Council, all centuries old, any one of whom can do fun things like pull satellites out of orbit and drop them on your house with pinpoint precision or stonewall an army of [[OurVampiresAreDifferent Red Court vampires]] and [[EldritchAbomination Outsiders]] with a single on the fly ward. Combined, they are a bona fide hyperpower and less a collective of magical beings, more a force of nature. ''And they backed the hell down''. One does not mess with the student of the Sorcerer Supreme.
** When Coulson recruits Harry Dresden to track down the ''veidrdraugar'' and their Master, Harry is reluctant because he knows very well that he's out of his depth - one of these creatures nearly ripped Loki's throat out, after all, and their Master is an Omega Class threat, never mind the Darkhold, which said Master possesses. Then he finds out that they killed children and takes the case, harshly telling his apprentice [[spoiler: Bruce Wayne]] to get out (because said apprentice is a bit too nosy for their own good and would end up dead or worse if they got involved). Dresden does not tolerate children being hurt or put in danger.
*** A few chapters later, Gravemoss utterly dismisses Dresden and [[spoiler: rips out Sif's heart]] with his bare hand. Harry responds by [[spoiler: unleashing his Death Curse]]. This is under Paris. A few moments later, a vast column of fire about a thousand feet high erupts over the Paris skyline and Gravemoss lands in the North Sea, somewhere off the east coast of Britain. And as a bonus, he incinerates several dozen of the ''veidrdraugr'' as a ''side effect''.
** Even Lucius Malfoy counts. He is as evil as they come, a fully fledged MagnificentBastard who has a somewhat Dalek like attitude to muggles (though he considers torturing them to be beneath him) and [[spoiler: murdered Harry's maternal grandparents in cold blood]]. But as [[spoiler: Baron Von Strucker]] found out, threatening his wife and son is the last thing you will ever do.
* In the FanFic/UltimateReImaginings, Clint is this towards Joey as he once nearly killed the boy's ''actual'' father for putting him in the hospital and breaking his arm when Joey had been twelve.
* John Winchester in ''Series/{{Supernatural}}/''Film/TheMatrix'' ''Fanfic/HuntingSeries'' part 3 - ''Hunting and Saving. He kills three vampires to save a little boy called Tom Anderson, thinking that he'd never be able to live with himself if he let the vamps live to kill more kids. That if he did it'd be like watching them kill Dean and Sam while he watched and he'd never let that happen.
* Do not mess with Dante's children in Fanfic/DantesNightAtFreddys or its sequel. He will gouge a carousel out of the ground and drop it on you if he can't find anything bigger.
* ''FanFic/AdoptedDisplaced'', a ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' multi-crossover series: ''All'' of the adoptive fathers and honorary uncles (and other males in the new families) in its various installments are highly protective of their adoptive Equestrian children, even after they've shown they've become strong enough to take care of themselves.
* Betelgeuse is this for Lydia in the ''Film/{{Beetlejuice}}''[=/=]''WesternAnimation/DannyPhantom'' crossover ''Fanfic/SayItThrice.'' Following the events of the movie, he - regretting certain past actions - effectively adopts her as his {{protectorate}}, and by the time of the fic they are LikeBrotherAndSister. He calls her "my girl" and has a tendency to [[BerserkButton go ballistic]] if anyone even thinks about hurting her.
* ''FAnfic/{{Wonderful}}'': Danny is this to his daughter Taylor. When a psychopathic mass-murderer threatened her, Danny tackled him.
* Jack Kenway in [[https://www.fanfiction.net/s/10870770/1/Harry-Potter-and-the-Grand-Trainer-Tournament Harry Potter and the Grand Trainer Tournament]] towards his adopted daughter Jasmine. When she was seven her parents were killed during a rally protesting Kanto basically ruling over Johto. That night Jack asks Jasmine what she wants and she says she wants Kanto to hurt. Jack proceeds to declare war on Kanto, ending with his discovering a lost Pokemon Art and blowing up the Kanto Pokemon League. To repeat... he started and won a civil war because the daughter he'd just adopted was crying. No one messes with Jack's little girl
** Remus has become this for Harry. When Lockehart tries to take a picture with Harry and wraps his arm around him Remus throws him to the ground and makes it VERY clear that no one touches his adopted son.

[[AC: WesternAnimation/DannyPhantom]]
* ''FanFic/FacingTheFutureSeries'': [[BumblingDad Jack]], while still a BunglingInventor, becomes a very dangerous opponent when you mess with his family, as in canon. [[spoiler: He went ballistic when he learned about Vlad's attempt to clone Danny. However, he quickly took in Danielle, the product of Vlad's twisted experiment, as his own kin, even laying siege to the Guys in White for kidnapping her]].
--> '''Jack''': "But heroes or not, NO ONE messes with Jack Fenton's kids!"

[[AC: Manga/DeathNote]]
* In the CrackFic ''FanFic/ACharmedLife'' after learning that Shinigami can die, Light becomes one for ''Ryuk'' much to his Shinigami's amusement.
* In ''FanFic/ACureForLove'' Matt is one for [[spoiler: V]] and Mello and Light is one for L:
-->'''Matt''': I know you're Kira or whatever... this is me impressed. Doesn't change the fact that if you start any funny business with her, I'll shoot you through the fucking wall. I'm quicker than you and your little Diary of Death. OK?
** Also:
-->'''Light''': It was you, wasn't it? You fucking tried to kill him!
-->'''[[spoiler: V]]''': I'm sorry, Light.
-->'''Light''': Not going to cut it, [[spoiler: V]]. I thought that you didn't want to kill L.
-->'''[[spoiler: V]]''': I don't.
-->'''Light''': If you touch him, I'll kill you. I'll kill all of you.
* Light/Kira becomes this for L and the Wammy's Kids in the ''Manga/DeathNote'' fic ''Fanfic/IWontSay'':
-->'''Light:''' I will also keep the [[ArtifactOfDeath Death Note]] where I can reach it whenever I need to, because I will need that power to protect you and our orphans. But... would you, and could you, perhaps, consider... combining Kira and L's powers?
-->'''L:''' What, as in, 'Quit killing, or I'll set Kira on you'?
-->'''Light:''' Yeah, pretty much like that.

[[AC: Franchise/DevilMayCry]]
* [[AlternateUniverseFic AU]] ''Franchise/DevilMayCry'' fic "[[http://www.fanfiction.net/s/6822576/1/Like_Father_Like_Son Like Father, Like Son]]" has Dante exhibiting his demonically-protective side when he finds his son Nero injured courtesy of a police officer with temper problems, and when Nero is later threatened by members of the mafia. The second time Nero gets threatened by the son of a mafia head, a partial Devil Trigger sends the man leaving with tail between legs. And when Dante finds the demon Baul, who had all but put Nero near Death's door... Cue UnstoppableRage and RoaringRampageOfRevenge with a dash of ThereIsNoKillLikeOverkill.

[[AC: Literature/{{Discworld}}]]
* The ''Literature/{{Discworld}}'' fic '''[[https://www.fanfiction.net/s/11536013/1/Hyperemesis-gravidarum Hyperemesis Gravidarum]]''' sees a new development for the Guild of Assassins. Several years after the first women officially graduate, inevitability sees a trio of pregnant Assassins. And it's at a time when a desperate gang with nothing to lose are targeting Assassins. One in particular. The murder gang discover Lady Assassins are Mama Bears when pregnant. It can only end one way for the terrorist gang. Especially when MamaBear is assisted in the end by the soon-to-be grandfather of her child, who realises that ''this'' time his Assassin daughter might just conceivably be taking on too much. He steps in to fight for her. And wins.
-->"Nine hundred and ninety times out of a thousand, your grown-up daughters are big girls who don't need you around any more." he said. "But on the thousandth time, a man had better be there for his girl, because she really will need him."
-->"Good." Johanna said, feeling five or six again.

[[AC: Franchise/DragonAge]]
* In the ''VideoGame/DragonAgeOrigins'' fanfic ''Fanfic/ShadowAndRose'', Oghren develops this sort of affection for Elissa, the Warden. He calls her "[[AffectionateNickname Princess]]," and acknowledges to her LoveInterest Alistair that he thinks of her like a daughter. "[[IfYouEverDoAnythingToHurtHer Which means that if you ever do her wrong]], I will cut you in half, [[spoiler:king or no king]]."

[[AC: {{Series/Emergency}}]]
* Roy [=DeSoto=] in [[http://www.tbillingsemergencyfanfic.com/storiesbytammy.htm this]] fic series. In one of the fics, he readily battles with a bear to protect his young son and John Gage. And though John is like a little brother to him, there's also an element of parent-child love in their relationship, and it's even {{lampshaded}} by Roy's son that Roy acts like a parent protecting his young when someone tries to hurt John-which happens quite often during the series.

* In ''[[FanFic/NeverHadAFriendLikeMe Never Had A Friend Like Me]]'', [[JerkassGenie Norm]] gets rather attached to his current master, an eight-year old ShrinkingViolet named [[OriginalCharacter Amanda]] who couldn't make a selfish wish if she tried. Anti-Cosmo and the Head Pixie put her in danger as collateral damage during a revenge plot against Timmy. Norm [[{{Understatement}} doesn't take it well]]. He ends up trapping the anti-fairies and pixies under [[WeaksauceWeakness butterfly nets]], giving them [[WorldofCardboardSpeech a clear outline]] what it means to tick off a powerful magical entity with no limitations on what he's allowed to do, and trapping their entire species in their home world with no way to return to Earth or Fairy World without outside help. And made it clear that ''this'' was being merciful because [[MoralityPet Amanda]] wouldn't like what he ''wanted'' to do to them.
** Before that moment, he had given Amanda's emotionally AbusiveParents a terrible flu for making Amanda cry on Christmas.

[[AC: {{Disney/Frozen}}]]
* [[OriginalCharacter Helena]]'s father in ''Fanfic/FrozenHearts''. While he fell into despair and alcoholism after losing his job at the castle as part of the staff reduction to keep Elsa's powers secret, he springs into action to protect his daughter from someone who tries to take advantage of her, and Helena recalls that at that point, he seemed to be his old self again. Unfortunately, he gets fatally stabbed in the process.

[[AC: Anime/FullmetalAlchemist]]
* The most common idea for parental Roy/Ed fanfics.

[[AC: LiveActionTv/GirlMeetsWorld]]
* In ''[[Fanfic/TheMinkiad The Minkiad]]'' Stuart Minkus gets protective over Farkle many times throughout the fics. One of the reasons that he stays with Jennifer is so he could protect and take the abuse meant for Farkle.[[spoiler:During the intervention, when Jennifer attacks Farkle, Minkus stands in front and has a CrowningMomentOfAwesome defending him]].
-->“Now you are my wife and Farkle’s mother, if either of those things ever meant anything to you, you will listen to what we have to say and you will: SIT! DOWN!”
** [[spoiler:A phone call from Farkle only saying three words, “Dad,” and “ please help” is enough to send Minkus taking the red-eye to Rochester and to enter the Bassett home to look for his son.]] Minkus also protects Farkle from other people such as Meese. When Meese slaps him, Minkus cites this as a reason why his dismissal is so much easier for him. Cory also gets very Papa Wolf towards his children and his students at times. [[spoiler:When Jennifer reveals that she knew that he called DFS on her Cory says "Yeah well I have this funny quirk that I don’t like when one of my students gets hurt, especially by their parents, the people who-oh, I don’t know-are supposed to love and take care of them. The funny thing is the state of New York doesn’t really like it either. So I have this obsessive urge to step in."]]

[[AC: Literature/HarryPotter]]
* In ''[[FanFic/HarrysNewHome Harry's New Home]]'', Snape will go to any lengths to protect his ward Harry, even if it included breaking rules or facing the Dark Lord and Dumbledore (if necessary) to do it. For that matter, Dumbledore does ''not'' like seeing any of his students harmed in any way, especially if it's Harry. His BerserkButton was pressed when he found out Umbridge used a Blood Quill on Harry and in the prequel, he gave a casual warning to Snape who earlier in a fit of rage slapped Harry. All in a cheerful tone and a benign smile.
--> "You do understand that if you ever, ''ever'' again strike a student in so brutal a fashion, you will not survive the night, correct?"
* In ''[[FanFic/ThreeSlytherinMarauders 3 Slytherin Marauders]]'' if you try and hurt Harry, Snape will ''end you''... that is if [[BigBrotherInstinct Tom]] doesn't do it first.

[[AC: WebComic/AxisPowersHetalia]]
* In response to the kink fill "Finacial Crisis Gangbang" where most of the main cast rapes America, "Use Your Fist Not Your Mouth is a AU fic where England and France not only not participate in it, but fight off his attackers to stop it from happening.

[[AC: Webcomic/{{Homestuck}}]]
* The fic ''[[http://archiveofourown.org/works/1297537 Warden]]'' portrays Tinkerbull (a tiny winged-bull creature) as this. It was inspired by someone pointing out how strange it was that Tinkerbull could survive on [[DeathWorld Alternia]].

[[AC: WesternAnimation/TheIncredibles]]
* Both Mr. Squall, [[WesternAnimation/TheIncredibles Mr. Parr]], and [[spoiler:Chomper the TyrannosaurusRex]] in ''Fanfic/RiseOfTheGaleforces.'' Subverted and later inverted for [[spoiler:Chomper's case, though, when his protectiveness of his fellow rexes [[EyeScream costs him his eye]] - but also makes his ''own children'' angry enough to [[KarmicDeath horribly slaughter]] the BigBad.]]

[[AC: VideoGame/KingdomHearts]]
* Fanfic/TheShroudedPath has Terra, who forces his way into ''Franchise/SilentHill'''s Otherworld to protect Ven. Later on, when he learns his friends have been captured by the BigBad, he immediately storms the place where they're being held and takes on ''the entire [[{{Cult}} Order]] at once''. He quickly one-ups this by [[spoiler:[[DidYouJustPunchOutCthulhu beating the Order's God to a pulp]]]].

[[AC: WesternAnimation/KungFuPanda]]
* ''Fanfic/TheVow'' (an AlternateUniverseFic of Lord Shen's life) provides several examples.
** Shen's father Lord Goa is a fair and calm ruler, but should his son or honored guest Lady Lianne put into immediate danger, he can be as ruthless as his son. After Shen is banished from Gongmen for his crimes and Lianne is demanded to return to [[ParentalNeglect her distant father]] Lord Chang who would continue pressuring her into marriage (with her having a broken heart due to her love Shen's actions), Goa keeps Chang from harassing Lianne for the rest 10 years of his life.
** There's also the canonical version of [[spoiler:Po's father]].
** Lianne believes for a long time that her father cares nothing for her safety, else he wouldn't have tried to marry her off so emphatically or sent her to live with strangers for a year after an argument about the quality of suitors he foisted onto her. However, when she returns to her birth home after 3 decades of absence, her uncle Hong reveals that when Chang heard about Shen's return and the subsequent imprisonment of Lianne, he wanted to do everything needed — like calling upon every favour he owed, summoning every general and friend or even seeking an audience with the Emperor himself — to raise an army and storm Gongmen City in order to rescue her. The only reason he didn't do this was because [[spoiler:he suffered a fatal stroke in his stress]].
** In the epilogue, [[spoiler:[[SparedByTheAdaptation Shen]] himself becomes this after he warms up to his and Lianne's son Zian, being as determined as [[MamaBear Lianne]] to keep him safe]].

[[AC: Film/TheLeagueofExtraordinaryGentlemen]]
* Skinner, Nemo, and Jekyll all have a tendency in this direction in ''FanFic/ThePrivateDiaryOfElizabethQuatermain''. Jekyll has (eventually) his adopted son, Nemo has his foster daughter, and Skinner has his niece.

[[AC: VideoGame/TheLegendOfSpyro]]
* Spyro from ''FanFic/TheLegendOfSpyroANewDawn'' is pretty protective of his adopted egg, just like [[MamaBear Cynder]], but a much bigger PapaWolf is Ember's father, Blaze. When [[TheDragon the Warden]] has Ember overpowered in their battle, Blaze blasts him, despite [[AgonyBeam the Warden's collar inflicting debilitating pain]] on any of the cursed slaves who attacks or touches him in anyway. Once [[spoiler:the Warden's collar is destroyed and the curse is broken]], Blaze tears through the cage holding him and [[FoeTossingCharge an entire mob of]] [[EliteMooks Warrior Gargoyles]] to get his claws in the Warden.
--> '''The Warden''': [[OhCrap Uh oh...]]

[[AC: Literature/TheLordOfTheRings]]
* In ''Literature/LordOfTheRings'' fanfics such as [[http://www.fanfiction.net/s/1179397/1/An-Eye-For-An-Eye An Eye For An Eye]] or [[http://www.fanfiction.net/s/2636049/1/The-Roots-of-Evil The Roots of Evil]], it is a sure way to trigger Legolas's BerserkButton is by hurting [[HeterosexualLifePartner Aragorn]] in any way, shape or form. It is the same with his older adopted brothers [[BigBrotherInstinct Elladan and Elrohir]], who must have gotten it from their father Elrond. All four elves have no hesitation to resort to ''killing'' anyone who dared lay a hand on Aragorn. And those times when they found that Aragorn was tortured and near death ... well, to say it did not go well with those people is putting it lightly.

[[AC: WesternAnimation/{{Megamind}}]]
* In the AU fic ''[[https://www.fanfiction.net/s/6844942/1/Knocked-Up Knocked Up]]'', Megamind saves a pregnant Roxanne from an extremist group intending to do their unborn child harm. And then, after the baby is born...
-->'''Megamind''': If anyone harms even a ''single hair'' on my daughter's head, or has a clear intention to do her, or her mother, harm, they will be obliterated with whatever weapon I can get my hands on quickest.
** It should be noted that Megamind is a former supervillain.

[[AC: WesternAnimation/MyLittlePonyFriendshipIsMagic]]
* Discord's Father in the ''FanFic/PonyPOVSeries'', [[EldritchAbomination Havoc]], AnthropomorphicPersonification of Mass Hysteria, is an odd case. He's an AbusiveParent, and He'll mock his children if they get beaten up by people defending themselves from them. However, any who harm them unprovoked will know His wrath.
** As shown in the ''7 Dreams/Nightmares'' side stories, Sweetheart's husband Teddy was this. When some corporate thugs tried to harm their family in order to intimidate their friends out of activating the world changing spell, he put them all in the hospital. And after [[ApocalypseHow/{{Class2}} the disaster]] caused by said spell failing, he fought off a group of [[MixAndMatchCritters smirughs]] that attacked the family when they were seeking refuge.
* Lord Tydal in ''FanFic/TheGodSquad'' takes PapaWolf to the extreme. Tydal tells his group about how he raised Celestia and Luna when they were babies, after their Mother (the creator of all things) dumped them on him. When Commander Hurricane and the pegasi army march up to Tydal's Keep, demanding the foals, Tydal tells Hurricane that two other armies (these being unicorns and earth ponies) beat him there. Tydal then reveals hundreds of severed heads before delivering this speech:
--> “Celestia and Luna are my sisters and under my protection. Three times Equestria has come to my door... the next time I see a flick of a pony’s tail my army will march upon your pathetic little country and I will raze it to the ground. Your stallions will be slaughtered, your mares used for our pleasure and your foals sold as slaves. I will burn your forests and salt the earth so nothing will grow again. I will burn the skies and cover the lands in darkness. I will personally come to your little Cloudsdale and I will rip it down from its high perch and crush it under my hooves. And only when this is all done will I finally come for you and your fellow rulers… and then your agony will begin. I will visit death upon you a thousand times and still not let my brother the Reaper claim your souls. That is only a taste of what I will do if you EVER THREATEN MY LITTLE SISTERS AGAIN! So... in a word, Commander... run."
** Tydal gets another one in the sequel, ''Equestria's Most Wanted.'' After giving up violence and becoming a pacifist, he is seconds away from achieving full enlightenment... only for Celestia to scream "DADDY!" when she is attacked. Tydal instantly breaks his vow and brutally murders her attacker, then warns an entire asylum that he is going to destroy them if they come near his girls again.
* ''FanFic/RealityChecksNyxverse:'' Twilight's LoveInterest, Ink Spot, becomes this to Nyx by the time he and Twilight get married. Best exemplified when he fights off Tirek to protect her, and later warns Discord -- in all seriousness -- that if Tirek's rampage, which is to blame on Discord's actions, have permanently harmed Nyx in any way, he won't need his magic to tie Discord's neck into a knot.
* ''FanFic/TheLifeOfAWantedChangeling:'' Bugze may be an unlucky, clumsy, and unskilled changeling, but threaten his daughter Nightshade and he's capable of delivering a CurbStompBattle to anypony from platoons of Royal Guard to ''Princess Celestia herself''

[[AC: Manga/{{Naruto}}]]
* Orochimaru, of all people, is one in the fic called ''[[http://www.fanfiction.net/s/4070794/1/A-Fathers-Wrath A Father's Wrath.]]'' In this story, he is Naruto's father instead of Minato. On the lighter side, he cares deeply for his son and his actions - including joining Akatsuki and forming the Sound Village - are all to protect him; he has found a source of redemption. But threatening Naruto is the fastest way for him to remind you that he wasn't called The Snake Sannin for nothing. Just ask [[FateWorseThanDeath Hidan.]]
* Naruto in ''[[http://www.fanfiction.net/s/5571816/20/Win-Some-Lose-Some Win Some, Lose Some]],'' a collection of one-shots. Naruto's warning when Kurenai, Hanabi, Ebisu, and Konohamaru find out about his (adoptive) daughter basically amounts to "If you tell anyone about my daughter, I'll kill you. If anyone tries to harm her, I'll kill them. If anyone kills her, I'll burn Konoha to the ground." Turned UpToEleven because the Nanabi is sealed within her, meaning the ''[[EldritchAbomination Kyuubi]]'' is protecting her too.
* [[EldritchAbomination Daiki]] from ''Fanfic/DestinyIsAHazyThing'' is this for Naruto. One scene has him tampering with Naruto's seal to allow him, Naruto and the Kyuubi to talk with his real parents. He promptly spends several minutes slowly brutalizing Minato's soul.

[[AC: ''Anime/NeonGenesisEvangelion'']]
* ''Fanfic/ACrownOfStars'': While Shinji is telling he does not believe he can forgive his abusive father, he is told that in timelines where his mother Yui did not die Gendo is an actually scarily overprotective father.
* ''Fanfic/TheChildOfLove'':
** Kaji tried –and almost managed- [[spoiler:to destroy SEELE to talk Gendo into giving up his plans]] and so protecting his former ward Asuka and her daughter.
** Subverted with Shinji. He tries to be this but he often panics or loses his nerve and other characters have to help him to man up.
--->'''Misato''':''"You're supposed to be a man now. ACT like a man! Come with me, NOW!"''
* ''Fanfic/{{HERZ}}'': Shinji hates killing… but threatens his wife or his daughter and he WILL do whatever it takes to protect them.
* ''Fanfic/NeonGenesisEvangelionGenocide'': [[spoiler:[[OriginalCharacter Nakajima's]]]] father plots against and eventually assassinates [[spoiler:[[BigBad Keel Lorenz]]]] in order to protect his son.
* ''Fanfic/TheSecondTry'': [[spoiler:Shinji,]] like [[spoiler:his wife Asuka,]] is very protective of his [[AfterTheEnd post-Third-Impact]] family, though he keeps his cool better than [[spoiler:Asuka]]...most of the time. Anyway hurt her or [[spoiler:their daughter Aki]]... And. You. Will. Die. You'll not even see it coming. [[spoiler:The MP-Evas]] learnt this the hard way.

[[AC: Manga/OnePiece]]
* One Piece's ''[[http://www.fanfiction.net/s/7166312/1/Muzzled Muzzled]]'' shows a moment where Zoro literally resorts to biting Marines (after having his swords taken away and his hands tied) who tried to separate him and the kidnapped Usopp and Nami to trap Luffy.
** Even more awesome than it sounds given his [[CutlassBetweenTheTeeth fighting style]]. His bites ''break bones''.
* One Piece's "[[https://www.fanfiction.net/s/11515678/38/This-Bites]]" shows this in spades during the SBS broadcast on Omatsuri Island where no few amount of viewers are forced to listen to their friends and families break-down and be devoured by Lily-Carnation. Some of the reactions are as follows.
---> '''Whitebeard's''': "I may not be able to sink that island from here...''But I am very tempted to try''."
---> '''Ace's''': "Because this broadcast is the the only thing keeping me from...BURN[ING] THAT F---ING ISLAND TO ASH...THAT'S IT! HE DIES NOW!"
---> '''Garp's''': "How dare you do this to my grandson....Buster Call? No.. thats to hands-off. We can destroy that island after I've ''ripped that monster apart WITH MY OWN TWO HANDS''!"
---> ''Dragon's''': 'I know you won't lose Luffy...but if you don't kill that monster for this, ''then I will''.'

[[AC: Franchise/{{Pokemon}}]]
* Silver, from Fanfic/PokemonTheGreatAdventure. The man is mercilessly protective toward Ash in particular and doesn't think twice before jumping at Mewtwo's throat for petrifying him. As the Legendaries say: "It's safer to attack a baby Kangaskhan in his mother's pouch than a kid Silver took under his wings". Did we mention he is a [[ThePrecursors very old Ancient]] and an [[AnIcePerson Ice Aura Master]]?

[[AC: WesternAnimation/RiseOfTheGuardians]]
* While it was established in the prequel books that Pitch was a PapaWolf, the story ''[[http://www.fanfiction.net/s/8751000/1/Guardian-of-Light Guardian of Light]]'' takes it UpToEleven. [[spoiler: While he starts out as an evil version of this trope early on, it eventually gets to the stage where he ''jumps off a cliff'' just to save his daughter, Helen.]]
** Helen's adoptive father is no slouch, either, and when Helen is taken by Pitch he joins up with his [[MamaBear ex-wife]] in order to rescue her. Even better, [[MeaningfulName his name is Lowell, which means 'little wolf']].
** Bunny and North have their moments as well, towards Sophie, Jack and Katherine respectively.
* In another story by the same author, called ''[[https://www.fanfiction.net/s/8807521/1/Lullabies Lullabies]]'', the Bennett children are orphaned and the Guardians adopt them. Then, one night, Pitch pays a visit. Bunny, who is guarding them, immediately gets into a fighting stance.
-->'''Bunny''': You take ''one step'' towards these little nippers, and I'll rip you apart where you stand.

[[AC: Manga/RurouniKenshin]]
* ''FanFic/LightOfTheSnowRedVillage'' is an AU fanfic that answers the question, what if Kenshin and Tomoe had a child? After Tomoe is killed much later in the timeline due to treachery from his superiors, Kenshin takes to wandering with his daughter Hikari. Throughout the story Kenshin is fiercely protective of her well being and happiness, even going so far barring her from learning kenjutsu (he later allows it, after it's pointed out by another character that it's hypocritical of him while he carries a sword himself). Following some adventures they eventually end up in Tokyo at the Kamiya Dojo, where the manga timeline begins. Currently incomplete, but it's a great story nonetheless.

[[AC: WebAnimation/{{RWBY}}]]
* [[Fanfic/WeissReacts Siegfried Schnee and Andreas Arc]] are very protective of their children, Weiss and Jaune respectively. Siegfried went on a RoaringRampageOfRevenge and deposed his father as CEO of the Schnee Dust Company after he caught wind that he [[AbusiveParents abused Weiss]], specifically.
** Taiyang Xiao Long and Ysengrim Belladonna, Yang and Blake's fathers, are also this.

[[AC: ComicBook/{{Sleepwalker}}]]
* [[FanFic/UltimateSleepwalker Sleepwalker]] is deeply torn by angst and loneliness over his being exiled from his home dimension of the Mindscape and trapped in Rick Sheridan's mind. He doesn't have any doubt at all about one thing, though. If you threaten Rick Sheridan or any of Sleepwalker's other close human friends, '''you are in for a world of hurt.'''

[[AC: Franchise/StarTrek]]
* ''FanFic/{{Insontis}}'':
** Anyone who hurts or upsets the de-aged Kirk can expect to face Vulcan wrath. This includes crew members. When a visitor hauls Kirk up by his shirt, Spock reacts with cold fury.
-->Spock was utterly expressionless, eyes devoid of anything but pure ice. That in itself was scary, because [the security team] knew that no one was as pure cool Vulcan as their Vulcan when he was restraining the urge to kill someone.
** Kirk himself becomes more and more protective of his crew as he gets older, culminating in his saving them from the Klingons in one of the final chapters.
* Kirk ([[SuperpoweredEvilSide empowered by]] [[spoiler: Khan's blood]]) in ''[[http://www.fanfiction.net/s/9344456/1/That-Was-A-Good-Fight That Was A Good Fight]]''. When a shapeshifting alien vampire thing threatened his crew, and specifically, [[MoralityPet Spock]], they had to clean what remained of the creature out of the floor tiles.
* The fic ''[[https://www.fanfiction.net/s/9694363/1/Safe-and-Sound Safe and Sound]]'' has a couple of examples:
** Khan is the most prominent. Like in the film, he is this to his crew, and is prepared to kill Dr. Korby in the most painful way possible upon discovering that the man [[spoiler: killed all but five members of his crew]]. He later nearly ''does'' carry it out after [[spoiler: his surrogate daughter, Lucille, is taken by the man. Said surrogate daughter is able to convince him not to.]]
** Spock gets a moment towards the end of the story. [[spoiler: Korby kidnaps a pregnant Uhura too, and when Spock sees Korby hit her, he attacks him in rage.]]
-->'''Spock''': ''(through a forced mind-meld)'' You hurt my bondmate. You threatened my child.
** [=McCoy=] also has a moment when trying to take back his daughter, Joanna, from his crazy ex-wife. "Once you took everything from me, including her...and hell, I'm not letting you take her again!"
** Kirk to his crew, and Lucille. Note that in this story, he's empowered by augment blood.
* Spock again in the fic ''[[https://www.fanfiction.net/s/9795158/1/Written-in-the-Stars Written in the Stars]]'', at least the Prime version. The Prime Fem!Kirk explains that when she was pregnant, she was taken hostage by the people of Gideon (TOS episode "The Mark of Gideon"). Lesson to be learnt: Don't kidnap a Vulcan's pregnant mate. It '''''will not''''' end well.

''[[AC: Franchise/StarWars]]''
* Qui Gon Jinn gets into an UnstoppableRage twice in ''[[https://www.fanfiction.net/s/151496/1/The-Marionettes-Dance The Marionettes Dance]]'' trying to protect his unconscious apprentice Obi Wan. The first time, he slices various limbs off four guards after having used a JediMindTrick to fool them into ignoring his lightsaber. Later, he's really set off when they lie and say Obi Wan died. He crushes one guard's throat but doesn't kill him, then does kill two more with his bare hands. The first guy gets a piece of nasal septum driven into his brain by Qui-Gon's elbow and the second guy gets his neck snapped after Qui Gon choke holds him (no Force involved) and forces him to admit that Obi Wan is still alive and where he's at. He may have felt he had no choice but to kill that one, he was wielding a box that controlled shock collars that both Jedi had been forced into wearing, and the ElectricTorture was really ticking off Qui Gon already.
* ''[[https://www.fanfiction.net/s/11040419/1/Gladiatorial-Jedi Gladiatorial Jedi]]'' ends in this plus MamaBear. Luke was forced into a GladiatorGames plot with threats to kill Mara and Ben if he didn't comply. But when he refuses the romantic advances of Callista, who's running the whole thing, she has Ben kidnapped and put in the arena. Really bad idea, as Luke is immediately on the attack as soon as he's freed from his cell. The guy who's sent to give Luke his lightsaber realizes very fast why he was told to hand over the saber, tell Luke what was going on, and get the heck out of the way. Luke gets help from an ally who befriended him during his ordeal, but isn't afraid to battle a large predatory creature to save his son. And then MamaBear Mara shows up to add to it.
* Uncle/niece version with Luke and Jaina in ''[[https://www.fanfiction.net/s/10383634/1/The-Love-of-an-Uncle-and-Niece-Luke-and-Jaina-one-shots The Love of An Uncle And Niece: Luke And Jaina One Shots]]''. Luke basically loves her like the daughter he never had, as many of them take place before his own son, Ben is born. The biggest one has Luke charging into a group of sleazy reporters and igniting his lightsaber to force them to back off a humiliated Jaina, who was victimized at prom by a cruel group of popular kids. Of course, Han is ready to kill someone too when he finds out about it.
* In the AU fic ''[[https://m.fanfiction.net/s/8555886/1/A-call-for-help A Call For Help]]'', Luke and the other rebels are captured by imperials and tortured shortly after a version of Bespin where Han't carbon frozen. Luke, not thinking clearly, calls to his father through the Force. Cue an enraged Vader storming the place a few minutes later and unleashing on the guards, even killing someone else's son in retaliation. He yells that he wanted the rebels alive but UNHARMED. Despite Luke again refusing to join, he even gives an hour head start of escape before the hunt resumes.
* Obi-Wan in [[http://swfanfic.livejournal.com/220184.html You Found Me]], when he [[spoiler:cuts off the arm of a bar patron that was beating up a very drunk Anakin]]

[[AC: Series/{{Supernatural}}]]
* In ''Series/{{Supernatural}}'s'' [[http://www.fanfiction.net/s/4949127/1/Deterioration_of_Reason Deterioration of Reason]], OC!Gabriel was already shown to be [[BigBrotherInstinct a protective big brother]] over Castiel and his BerserkButton is if any harm comes to Castiel. But when the demon Belial, who had kidnapped and tortured Castiel, implied that he [[RapeAsDrama did something else]] to Castiel, not only does Gabriel go into TranquilFury, but it's revealed that '''God Himself''' has had enough.
--> There was no way for the overwhelming wrath of God to be made evident through mere behavior. The archangel was no longer responding to the demon's mocking himself for the light that surrounded his already blinding form had no place on the conceptualized wavelength of mortal comprehension; it was the response of an incensed Father to the torture and ridicule of one of his sons, it was the vengeful mark of the Lord Himself.
* In ''Series/{{Supernatural}}'''s [[http://www.fanfiction.net/s/6536156/1/Crossing_the_Line Crossing the Line]], John Winchester kills a human being for the first time because [[spoiler: it was heavily implied said person had molested/sexually assaulted a ten-year-old Sam.]]

[[AC: VideoGame/TeamFortress2]]
* In the ''[[VideoGame/TeamFortress2 Team Fortress 2]]'' fic ''Paternal,'' the RED Spy becomes this to the BLU Scout, protecting him from the Administrator's henchmen at all costs and even facing down the Administrator herself to keep him safe. Discussed by the BLU Engineer in Chapter 26 after Heavy and Pyro express wishes to kill the Administrator's Spy for [[IHaveYouNowMyPretty sexually assaulting Scout:]]
-->'''Engineer:''' Sorry, boys, but I think Red's earned the right to kill that son-of-a-bitch. I don't know if any of you are fathers, but I know that if someone had hurt my daughter, I'd take him out back and shoot his brains out for even touching her. I'm sure Red wants to do the same thing to Bane for what that snake did to his son.
** Exploited by the Administrator, who knows that the RED Spy has a doomsday device activation code that she gave him many years ago when they were dating and which, in turn, is actually [[spoiler:on a pair of dog tags that the RED Spy gave to the BLU Scout when he was little]]. After [[spoiler:BLU Scout shows his father the tags]], her plan changes shape: capture Scout and use him as a bargaining tool in exchange for [[spoiler:the tags]], knowing that the RED Spy will stop at nothing to ensure his son's safety.

[[AC: Franchise/{{Transformers}}]]
* Optimus Prime and Ratchet in ''[[FanFic/ThingsWeDontTellHumans Things We Don't Tell Humans]]''. Optimus is a fan of children, and Elita puts off telling him about how badly Quicksilver was treated because she ''knows'' he'll react badly (he does, and it's a little terrifying). Ratchet tries to pick a fight with a general who dismisses Prowl as just a numbers guy.
** Ironhide is implied to be one (and seems to have adopted Sam and Carly). So is Tom Banachek, if the Autobots' dread of telling Tom and Dana about Faust's "capture" is anything to go by.
* [[FanFic/BlackCrayons Don't mess with Annabelle Lennox]]. Not only would that tick off [[HumansAreWarriors her actual father, Will Lennox]], but it will also anger [[TriggerHappy the Autobot Weapon Specialist]], [[HonoraryUncle Ironhide]]. And probably most of the other Autobots, who are rather fond of her. [[CurbStompBattle Barricade learned this the hard way]].