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- Attack on Titan:
- Mikasa Ackerman towards her adoptive brother Eren Yeager, since he killed her parents' murderers, saved her from them, *and* let her into his family. She's violently over-protective, to the extent that she will ignore direct orders or the greater good (such as helping evacuate citizens) to protect him. On numerous occasions, she's threatened the lives of even her True Companions, making it clear if forced to choose between Eren's well-being and their lives, she will kill them without hesitation.
- Levi was one to his ill-fated surrogate little sister, Isabel, in the Spin-Off prequel about his past. When she came home beaten up and missing a pigtail, he went out. He comes home that evening, cleaning blood off a knife and won't answer when their companion Farlan asks if he killed those responsible. When Isabel and Farlan both get eaten by an Aberrant, Levi loses it and utterly MASSACRES the Titan in question.
- Lelouch Lamperouge from Code Geass.
- After his younger sister Nunally was wounded in a terrorist attack (that also killed their mother), he started a war and took over the world, all for her sake. And when she found out, she got pissed.
- In Season 1 Mao, a Stalker with a Crush to Lelouch's partner C.C, kidnapped poor Nunnally and strapped a bomb to her. Lelouch was already very pissed off at Mao, since he first Mind Raped his poor, sweet classmate — and a total innocent bystander which he had no business to involve — Shirley and then did the same to his Forgotten Childhood Friend Suzaku; needless to say, Mao did not meet a pleasing end.
- Bleach has a few examples:
- Ichigo adamantly believes the reason a big brother is born first is to protect all the little siblings that follow. He will force-feed this belief by the sword if he has to, to any big brother he catches not protecting their own siblings, as both Orihime and Rukia's respective big brothers discover. When he feels anyone he cares about is being threatened, he becomes single-minded about saving them, taking on both Soul Society and Hueco Mundo when Rukia and Orihime need rescuing from their respective hostage situations. When his entire family and social circle are brainwashed by a villain, he is left so isolated from the very people he is trying to save that he actually comes to accept that the only solution will be to kill the villain instead of simply defeating them. When Yuzu dies in the fourth movie after being exposed for too long to Hell's miasma, Ichigo completely loses control, enters his super-Hollow form and destroys Hell's gate.
- Byakuya once made two separate vows: a promise to his dead parents that he would always uphold the law, and a promise to his dying wife to protect her sister, Rukia. When Rukia is sentenced to execution, those two vows conflict and Byakuya is forced to choose the vow that was made to his parents, which trumps a vow made to a wife. Ichigo helps him resolve the conflict, freeing Byakuya to do what he wanted from the beginning - protect Rukia. He does so with a dreadful, single-minded purpose; when Zommari decides to kill an unconscious Rukia, Byakuya intervenes. When Zommari is defeated, he rants about Shinigami arrogance in thinking they have the right to slay hollows. Byakuya corrects him, explaining that killing Zommari has nothing to do with being a Shinigami and that it's instead because Zommari dared to point a sword at Rukia.
- Hitsugaya and Hinamori have been raised together by an old woman they both refer to as their grandmother. He is incredibly protective of her despite being the younger of the two to the point where he attacked a perceived threat to her with such force two nearby vice-captains were caught up in the power he unleashed (one of which was actually her). In the end, their relationship is exploited by Aizen, who tricks Hitsugaya into stabbing an illusion of Aizen - when the illusion disappears, it's revealed that Hitsugaya has stabbed Hinamori. As a result, Hitsugaya vows to become strong enough to protect Hinamori from everything.
- A deconstructed case with the movie character Kokuto within the franchise. His younger sister got killed and Kokuto killed her murderer, but Kokuto got punished later on and ended being in Hell in his after life. He could not accept his punishment and tries everything to break out of Hell, even going so far to manipulate Shuren and his men to lure out Ichigo to Hell and use his Hollow powers to break his chains. This is where the Foil part kicks in. After Ichigo's sister is revived, Ichigo returns to Hell to save his friends from Kokuto's hands and not to seek revenge on him, while Kokuto's desire for freedom comes from his hatred for his punishment, as he thinks that he doesn't deserves that for revenging his sister. Hell sympathizes more with Ichigo and lend him its power to defeat Kokuto, who then gets punished even harder.
- Henry Wong from Digimon Tamers went from being the most rational and calm guy in the group to being temperamental, hasty and reckless when his sister ends up in the Digital World.
- Caren, the Aloof Ally of Mermaid Melody Pichi Pichi Pitch, starts dangerously close to this, having been perfectly fine until her twin sister was kidnapped. However, while she blames and berates the good guys as well as the bad, she does do a lot of reluctant rescues and admits that she was wrong instead of going off the deep end.
- Another Knight Templar Younger Brother is Fire God Apollo from Cyborg 009, towards his older sister Hunt Goddess Artemis. When the girl died very tragically, the already unstable Apollo went literally insane with grief and killed the culprit, then let himself die whispering his sister's name.
- Ran Fujimiya in Weiß Kreuz is downright obsessively protective of his Ill Girl little sister Aya. He became an assassin in large part to pay her medical bills (she's in a coma), and he is not in the least bit rational about threats to her safety.
- Kankuro becomes one of these as a part of his Character Development, reacting violently to anyone who badmouths his little brother Gaara in front of him and going after Gaara alone after Deidara and Sasori of Akatsuki kidnap him and Kankuro's team mates are nearly all killed in an explosion. Given that Gaara used to be an Ax-Crazy psychopath who regularly threatened to kill Kankuro, this is quite a drastic change. Sadly, it all goes horribly wrong when poor Kankuro gets his arse handed to him by Sasori, and Sakura barely manages to save him.
- Kinkaku seems to fit here as well. He and his brother, Ginkaku, are Siblings in Crime who work well together. Ginkaku's most used word in his life being his brother's name. In their battle, Ginkaku is backed into a corner, and he calls for his brother's help, but him saying his brother's name gets him sealed, as he wasn't supposed to say his most-used word at the time. In response to this, Kinkaku flies into rage and undergoes bijuu transformation. Kakuzu, nearby states something must have happened to Ginkaku because it's been ages since he saw Kinkaku in such a state. Darui apologizes to Kinkaku, but he just states it's too late and attacks anyhow, and rips through the division like crazy. Special preparations had to be made in bringing down Kinkaku, with the Raikage stating he was unstoppable otherwise. Prior to Ginkaku's sealing, Kinkaku was rather stoic, averted in the anime◊.
- There's also the Raikage. When he is told his brother Killer Bee was killed by Akatsuki his response was to call an international meeting to stop Akatsuki. When he found Sasuke he became so hellbent on revenge that he didn't even care if he lost his arm to kill him. And his leg, too, if Gaara hadn't stopped him. It's also possible that, despite all that, if Gaara hadn't stopped him, Sasuke would have died.
- Itachi Uchiha towards Sasuke and the Leaf Village. The whole Uchiha Massacre episode was set up to protect Konoha from the coup d'etat his own father was planning, and though he was able to kill both of his parents, his best friend, and his girlfriend, he couldn't bring himself to kill Sasuke. He even went so far as to threaten to leak the village's information to every rival village if Sasuke was ever hurt due to something the leaders of Konoha had done or ordered. Let's not even discuss the deal with their fight to the death or the fact that Itachi let Naruto get away from him after said Idiot Hero promised to straighten the then-rogue Sasuke out. And after what happened to Madara when Sasuke saw his Sharingan, it's rather frightening to imagine the exact consequences of someone doing anything to permanently injure Sasuke.
- Neji Hyuga becomes this for his younger cousin Hinata in Rock Lee's Springtime of Youth, where he beats up and kicks everyone who wrongs Hinata. He mostly does it to Naruto, because Naruto obliviously says inappropriate things to Hinata, which leads to Neji beating the crap out of Naruto. There is also this instance where Hinata timidly approaches Naruto, Neji, and Lee. Neji tells Naruto and Lee to be patient with her and wait for her to speak. More than twenty minutes pass and then Hinata finally gathers the courage to say something about the weather, which makes Naruto and Lee burst out That was it?!, making Hinata feel bad and depressed, which makes Neji kick Naruto and Lee into space.
- One Piece:
- It's the younger brother, Monkey D. Luffy, that deploys this behavior. He goes on a rampage once he hears that his older brother, Portgas D. Ace, has been taken captive by the World Government and is on death row. He not only breaks into the heavily-guarded Impel Down and nearly gets himself killed by trying to go against the Big Bad Magellan, but also decides to go further to the Marine HQ when he fails to make it in time to prevent his brother from being transferred to his execution site. He also gets furious when he comes face-to-face with the man responsible for his brother's capture. When Luffy is taunted that part of the reason that Ace went up against the man is that he threatened to kill Luffy and turn him in for his bounty, Luffy loses control, attempts to flatten him, and has to be reminded that saving his brother is more important than avenging his defeat.
- Played straight with the older brother Ace. When he found out that Luffy was being targeted, he wasn't pleased at all.
- Rounding out the brothers is the not-quite-dead Sabo. There isn't anything Sabo wouldn't do for Luffy, his precious baby brother and, with Ace's death, the only family he has left in the world. In fact, the only reason Sabo hadn't joined the war to save Ace is because of amnesia — which was only cleared up when he read an article detailing Ace's death. Hence, Sabo is willing to cut a bloody swathe throughout the entire damn world if it meant protecting his only remaining brother.
- Mad Scientist Komui Lee of D.Gray-Man is very protective of his younger sister, Action Girl Lenalee. So much so that Link, wanting to go into a room which Allen had locked him out of, threatened him with, "you leave me no choice. I am forced to tell Supervisor Komui that you are in a sealed room with Lenalee Lee," to which Allen quickly apologized and let him in. There is also an anime-only filler episode where Komui mistakenly thinks that Lenalee is going on a date with one of the Order's scientists and has to be convinced to simply stalk them all over town instead of outright killing the guy. He then repeatedly tries to attack and is comically restrained, until eventually he manages to summon a huge robot to aid him. An excellent summation:
Reever: "Section Chief Peck, I would advise you not to look at Lenalee that way."Peck: "Why? Does she have a lover?"Reever: "She has a brother."
- Ryo Mashiba from Hajime no Ippo was orphaned when he was in high school, so he had to raise his younger sister Kumi on his own. Being a borderline Sociopathic Hero, he ends up as this towards her, and it's both played for drama and for hilarity.
- Subverted with Seimei Aoyagi from Loveless. To him, it doesn't really matter HOW you treat his younger brother Ritsuka. Seimei believes that Ritsuka belongs to him and will get rid of anyone in his way.
- This trope is revealed to be Folken Lacour de Fanel's main motivation in The Vision of Escaflowne. Having failed to pass the Dragon rite (and having been mutilated in the process), Folken joined Dornkirk in hopes that he could create a world where his younger brother Van won't have to fight as king.
- Kayo's brother in the Vampire Princess Miyu TV series has a Big Brother Instinct at first and then becomes this, trying to kill Miyu for getting close to his baby sister.
- In the manga of Death Note Light Yagami claims in an early Motive Rant that part of the reason he's killing criminals en masse is to make the world a safer place for his little sister Sayu.
- It might even be somewhat true. Sayu is, after all, the only person he refused to kill when it would be to his advantage to kill her. Then again, it could be that he just realized Mello would keep kidnapping people until he finally did something about it other than kill their prisoners.
- In Hell Teacher Nube, the demon Bakki can bounce between Laughably Evil and evil... but if you hurt his little sister Minki, you. are. DEAD.
- Deconstructed in Overman King Gainer: Asuham Boone will react violently (and disproportionately) towards any slight to his younger sister Karin, even minor or imagined ones. The whole reason why he wants to capture Gain and thwart the Exodus is that he had convinced himself that Gain had seduced and abandoned her, while the truth is that Gain and Karin had a one-night stand and Asuham overreacted. It gets so bad that during the last episodes, Asuham goes insane with rage and decides to destroy both Gain and the Exodists by awakening the Overdevil, a world-ending Eldritch Abomination. He gets better, though... Perhaps too much.
- When Last Order is kidnapped in A Certain Magical Index, Accelerator reverts back into the person he used to be, except in an effort to save her. Slaughter ensues. The lesson in all this? Don't mess with Last Order if you value your life. Misaka also has shades of this herself when she discovers what's happening to her sisters/clones and what she's willing to go through to stop the Level 6 Project.
- Detective School Q: Kunihiko and Akihiko Ichinose become this, trying to protect their sister Kaoru from a Smug Snake aunt who wants to become her tutor and steal the fortune she inherited from their Missing Mom alongside a Phony Psychic accomplice. They kill the psychic first, and then they murder the aunt when she finds out and tries blackmailing them. Only the psychic was their mom under a disguise, having faked her death to save her business and watch over her kids. Whoops.
- Both inverted and played straight in Fullmetal Alchemist.
- Edward is multiple times in the series confronted with the question of how far he's willing to go to save Alphonse, but sanity and morality usually win out. However, in an early episode of the 2003 anime adaptation, Alphonse comments that if something were to happen to Ed, Al might well go on a killer rampage just like Scar did.
- Scar counted as one himself. The realization of his brother's death sent him into an uncontrollable rage, during which time he killed the Rockbells. He later moves on to hunting down and murdering State Alchemists to avenge him.
- Phoenix Ikki of Saint Seiya embodies this trope when his little brother Andromeda Shun is involved, to the point that putting Shun in life-threatening danger became the default way to work Ikki into any given storyline.
- In Chrono Crusade:
- When Rosette Christopher's little brother is kidnapped by the Big Bad, she makes a Deal with the Devil and spends four years training as a Church Militant. The moment she discovers the location of her brother, she travels from New York to San Francisco, guns blazing, killing any demon that attempts to get in her way, all while being the only Badass Normal in the manga (the anime eventually gave her holy powers). In the manga, it all leads to a battle between her and Joshua Christopher himself who is strong enough to tear apart a massive army of demons with his bare hands. And she kicks his ass.
- There's also Fiore, who considers herself as something of a big sister to Joshua. She seems gentle and demure at first, but when the time comes she doesn't hesitate to die in an attempt to protect Joshua, even going directly against her master's orders in the manga.
- Durarara!!'s Shizuo Heiwajima tends to act like this in regards to his little brother, Kasuka. While he has reason to be concerned for his brother's safety and privacy (Kasuka's a popular actor, and has been stalked by both rabid fans and the paparazzi in the past), Shizuo takes it a bit too far by immediately becoming suspicious of any mention of his brother by strangers, innocent or otherwise. Said suspicion usually escalates into tree-throwing.
- Touya from Cardcaptor Sakura has shades of this because he promised his mother on her deathbed that he'd protect Sakura. For one, he jumped over a fence and tried to beat up a 10 year old boy for bullying Sakura.
- Inverted in Rurouni Kenshin in that Enishi is a Knight Templar Little Brother. So concerned about his older sister's well-being and so seething with pure hatred toward his brother-in-law for killing Tomoe's fiance, though unbeknown to Kenshin at the time that Enishi collaborated with a league of Shogun assassins in order to kill Kenshin - and this was while he was ten or twelve. After witnessing Kenshin killing Tomoe (though by accident) Enishi became a little psychopath before getting involved in organized crime in order to one day take revenge on the man who killed his sister.
- Lets not forget Urd from Ah! My Goddess! Urd makes it clear that she will do anything and use any power she has to in order to protect her sisters, Belldandy and Skuld. Urd has to continually "punish" Aoshima after his latest rape attempt against Belldandy or Skuld (he tried to force himself on her when Skuld grew up after Yggdrasil crashed). Urd stood up to her own mother Hild, the Daimakaicho, telling her to stop tormenting "her little sister" Skuld after Skuld incurred her wrath. Also, Urd actually passed the test to become a First-Class Goddess (the highest level that every goddess tries to attain) but declines because First-Class Goddesses have to use their powers to protect everyone; Urd only wants to use her powers to protect her sisters. Since Belldandy goes absolutely postal if anyone even blinks wrong at Keiichi, it is easy to overlook that Urd is a Templar Knight Big Sister as well.
- Akira's older brothers in Ai Ore! Love Me! are quite protective of him.
- More than one Sympathetic Murderer in Detective Conan is a brother or a sister seeking revenge for the death or ruin of their younger or older sibling. Some examples are Toshiya Tadakoro (kills his boss for causing the death of his Ill Girl sister while Moving the Goalposts), Akiko Sayama (kills a corrupt PC programmer for causing her older brother's ruin and suicide), Chieri Aki aka Eri Akechi (kills two Alpha Bitches for framing her long-lost younger sister for drug trade and making her commit suicide), Masao Kouda (doesn't kill anyone but becomes a bank robber to hide his loot in the backyard of the man who killed his younger sister and force them dig in to find the girl's corpse), Midori Nozaki (brews a mix of Fatal Method Acting and Thanatos Gambit to both commit suicide and take the woman who made her sister kill herself down with her) and others.
- Kanba Takakura from Mawaru-Penguindrum, as of episode 21. It ends with his Redemption Equals Death.
- Romano from Axis Powers Hetalia tries, bless him. Luckily for Germany, he can't throw a grenade properly and can't come up with anything worse than holding up a stupid mustache so that it looks like Germany's wearing it then breaking down in tears when Germany points out that from his angle, it looks like Romano's the one wearing it.
- Depending on your interpretation of their relationship, Spain is either this, Papa Wolf or something else entirely to Romano.
- Done literally and averted with Germany and Prussia. Prussia used to be the physical personification of The Knight Templars, and is Germany's older brother, but doesn't actually act like a Knight Templar brother.
- Depending on your interpretation of their relationship, Spain is either this, Papa Wolf or something else entirely to Romano.
- In Hunter × Hunter, Illumi Zoldyck's feelings for his younger brother Killua are...intense. He is extremely protective and possessive of him. Being creepy even by the standards of a family of assassins, his protectiveness manifests in twisted ways. Such as shoving a needle into Killua's brain to make him into a coward who will flee from any confrontation against a powerful opponent. Threatening Killua is also Illumi's Berserk Button. During an otherwise civil conversation, the very moment Hisoka implies he wants to kill Killua, Illumi puts on a Nightmare Face and radiates a killing aura so intense that Killua can feel it from miles away. He immediately calms down when he realizes Hisoka was trolling him. Note that Illumi only feels this way towards Killua. He seems indifferent towards Milluki and Kalluto and he wants to kill/enslave Alluka.
- Kagetsu of Shamanic Princess adores his little sister Sara. So much so, that when the Powers That Be give her as an offering to a powerful sentient magical artifact, he steals the artifact at the risk of causing the collapse of his world to save her.
- Vincent Nightray from Pandora Hearts is one year younger than his brother Gilbert, but his obsessive love for him definitely qualifies for the trope. When they were children, Vincent used his Apocalypse Lad powers to destroy an entire city in order to save his brother. In present time, Vincent's stated goal is to erase his own existence so that Gilbert will be happier.
- During the years of Pretty Cure, many of the Cures who have siblings got angry when a villain dared to attack those said siblings, but the only one who got really mad was none other than Cure Black, who actually killed a villain (Gekidrago) for revenge of hurting her Annoying Younger Sibling.
- Shinnosuke from Apocalypse Alice, who tries very hard to be The Unfettered in wanting to save his little sister. To achieve that goal, he's sworn off anything unnecessarily detrimental to him, such as sticking his neck out for others as he can't afford to die before rescuing his sister. That said, keyword is tries.
- Shouri Shibuya, the protagonist's older brother, from Kyo Kara Maoh!. He always felt responsible for protecting Yuuri, so after learning his little brother's eventual fate to become the Maou of another world when both of them were children, Shouri decided to get strong enough to continue protecting him even as Maou. Unfortunately, he wasn't there yet by the time Yuuri actually went to the other world, and on top of that his little brother found protectors in that world who were more capable than Shouri could hope to compete with. Neither of these things sat well with him, and his struggle to deal with this and learn to let Yuuri go be king is a major part of his character arc.
- Yami Yugi from Yu-Gi-Oh! is this towards Yugi (and later, Yugi's friends as well) in the earlier issues of the manga and season 0 of the anime, viciously destroying anyone (both teenage and adult) who bullies or otherwise hurts them by playing sadistic games with Saw-like stakes or by invoking magical penalty games that drive them insane. Sometimes the bullies' actions are severe enough to warrant it, but most are Disproportionate Retribution. He also shows this to a lesser degree in the Duel Monsters anime, particularly in season 1 (before Yugi's influence mellows him out), and in season 4 (when Yugi's soul is stolen.)
- Tatsuya Shiba from The Irregular at Magic High School. Don't mess with Miyuki. Seriously, don't.
- Katina Choovanski is quite capable of taking care of herself, but her crimelord sister still keeps interfering in her life - sometimes by killing people horribly because they tried to hurt Katchoo, sometimes by trying to ensure that she ends up with the "right" love interest. Our heroine does not appreciate this.
- Raphael, while not being the most even-tempered character, is psychotically protective of little brother Michelangelo - to the point where he states that the 'thought of Mikey being hurt makes him experience violent rage' (see The Other Wiki). And considering how violent Raphael is usually...
- She-Hulk and the Incredible Hulk are cousins, but they have a Brother/Sister relationship. She-Hulk can take care of herself most of the time, but pity the poor fool who harms She-Hulk within proximity of The Hulk. She-Hulk herself can be extremely overprotective of The Hulk as well. Iron Man got his ass handed to him by Ms. Hulk when she found out Stark exiled Hulk into space.
- How about that time Nightwing freakin' killed The Joker with his bare hands when he thought he killed Robin? Of course, ol' Bats quickly revived him afterwards, but even still.
- Quicksilver for the Scarlet Witch, except that he is her twin, not big brother. But recent portraying of Wanda's power suggest that if you attack Wanda, you are lucky if Quicksilver kicks your ass before she has to use her power.
- Thor's brother Loki is a manipulative, deceitful god of lies and mischief, and he often does bad things and sometimes gets punished for them… but if you dare hurt him unjustly Thor will smite you from the face of the Earth.
- In Uncanny X-Men, Colossus was this toward his sister Illyana, to the point where he allowed himself to be possessed by the demon Cytorrak and became the new Juggernaut to protect her, losing his humanity and the love of Kitty Pryde in the bargain. Cruelly subverted; Illyana herself had manipulated Colossus into becoming the new Juggernaut to demonstrate that the sweet innocent girl Piotr called "Little Snowflake" was long-gone, replaced by a happily psychotic monster who was not worth saving. When he learned the truth, Colossus vowed that he would kill Illyana if they ever met again.
- The Kage Tenshi's The Red Monarch's Sousuke Miyabe is one for his little sibling Tatsuki. To put things into perspective, 10 years ago, he kills several Center agents, nearly kills M.O.M and Colin Price and even kills his own parents when they try to protect Colin. Tatsuki saw ALL OF THIS, which comes back in literal nightmares. To get the full story, if you read the spoilers, read The Red Monarch until you reach the most recent chapter, as it is still ongoing. The link directly to the story is provided for convenience.
- In Murderer's Row, a Prison AU of Red vs. Blue, Grif and Simmons were thrown in prison for murdering a man who hospitalized Sister.
- In Magica Madoka Veneficus Puella, Sayaka adopts an orphan. Someone kidnaps her. Do the math.
- In Kitsune no Ken: Fist of the Fox, Neji is a Knight Templar Older Cousin for Hinata, going to varying lengths to keep Naruto away from her, up to and including attempting to manipulate events so Naruto will get kicked out of Konoha High School. Hiashi approves, especially after they find out Naruto was one of the legendary Nine Terrors, but Hinata herself is not pleased.
- In the Pandora Hearts post-series fanfic Beyond The Winding Road, Anderson is this to Oz, doubting that Oz can take care of himself due to his past mental health issues. He goes after Gilbert, whom he sees as a stalker, with all the viciousness of a bull shark. It's sort of justifiable, though, as Oz is implied to have had problems with stalkers in the past and had too many psychological issues then to deal with it himself. Anderson even accuses Gilbert of going along with his brother's "delusions" just so he can find a psychological trigger.
- In the Bleach Peggy Sue fic Hogyoku ex Machina, when Ichigo learns of Toshiro Hitsugaya's interaction with his sister Karin (soccer game, anime filler), and is led to believe that she had developed a crush on her, the first words out of his mouth are "He dies." Toshiro, who is eavesdropping along with many others, is understandably disturbed. Later, after Ichigo reenters the Final Getsuga Tensho form…
Ichigo: You saw everything? All of you?(Yamamoto nods)Ichigo: Good. Hitsugaya-taicho.(Flash Steps next to Toshiro and puts his hand on his shoulder, one finger dangerously close to his neck, and the cloth Ichigo is touching begins to burn away from contact with Ichigo's Physical God state)Ichigo: Stay out of the living world.
- What makes this particularly effective? Ichigo always addressed the Squad 10 captain as Toshiro, regardless of how many times the latter demanded to be called Hitsugaya-taicho instead. The circumstances surrounding the above interaction make it so that, when he finally uses the preferred title, the captain immediately begins praying that Ichigo would call him Toshiro again.
- The Blind Side: Michael is usually a Gentle Giant, but a drug dealer hits Michael's Berserk Button by making sexual comments about Collins, and Michael flies into an Unstoppable Rage.
- Do not hurt Molly in Sleepaway Camp II: Unhappy Campers, emotionally or physically. Angela will kill you for it. Just ask Ally, who was drowned in an outhouse for committing that crime!
- When the protagonist of Sick Girl finds out her little brother's being bullied, she hunts the three bullies down, kills one of them, and forces the lead bully to drown the other, then ties him up in her barn and spends several days torturing him to death.
- Dead Man's Shoes. Somewhat after the fact, older brother Richard returns from the army after discovering his brother has been bullied and goes about giving the bullies a taste of their own medicine with interest.
- Haru from Beverly Hills Ninja: "I may not be the Great White Ninja, I may not be one with the universe but I know this...NO ONE MESSES WITH MY BROTHER!"
- The titular character of Ginger Snaps starts out as a Knight Templar Big Sister and gets steadily worse over the course of the movie, as her transformation into a werewolf makes her more and more aggressive. For example, she kills the janitor because she thought she saw him look down Brigitte's top earlier in the movie.
- In the 1938 Yiddish film Mamele, Khavkhe (Molly Picon) takes care of her whole family. A gangster, Max Katz, recruits her brother into a burglary gang, and courts her sister (with the intention of turning her into a prostitute). Khavkhe manages to pickpocket Katz's gun, and makes him write a letter breaking up with the sister. ("You may be a Katz (cat), but you'll leave here as a kitten.")
- Four Brothers: Bobby Mercer is already pretty violent and short-tempered to begin with, but hurt his younger brothers and he will put you in either the hospital or a body bag. He proves this multiple times throughout the movie, especially when he goes on a murderous rampage against Detroit crimelord Victor Sweet and his cronies after the murder of youngest brother, Jack.
- Tony Montana from Scarface (1983) is just a tiny bit overprotective of his little sister Gina, even going as far as murdering Manny Ribera, his best buddy, for sleeping with her behind his back. However, unbeknownst to him, said friend had married Gina the day before. Worth noting that more than one critic has observed an incestuous undertone to some of Tony's actions of which Gina also accuses him when she tries to kill him in revenge.
- Alpha Dog. When Jake Mazursky learns that Johnny Truelove has kidnapped his little brother Zack to get back at Jake, he promises his estranged stepmom that he will do anything to get Zack back. Jake immediately goes on a rampage, crashes a local house party held by some of Truelove's friends by beating up half the people in the room and when Truelove calls him up, Jake threatens Truelove with enacting brutal and painful vengeance unless he releases Zack. Subverted however, as it doesn't help Zack's return at all and prompts Truelove to relocate with his victim.
- American History X: Derek threatens to feed Cameron's heart to him if he continues trying to corrupt Danny like he did with him.
- Cal Leandros:
- Niko Leandros would burn the world to protect his brother. The only reason Cal ever gets near to any combat is because Nico is a firm believer that the only way to be ready for combat is to actually participate in it.
- Cal reciprocates the sentiment just as strongly. And considering he's slowly slipping into a Sociopathic Type V Anti-Hero over the course of the series with Niko as his sole Morality Chain...the question isn't if he kills you, but how much he'll make it hurt before he does so.
- James Vane from The Picture of Dorian Gray. His little sister Sybill killed herself when he was working abroad, so when he found out, he swore to kill the culprit, Dorian Gray. He almost got his wish, but was accidentally shot to death.
- In Hell's Children, by Andrew Boland, you never, ever mess with Acheri, or her de facto big Brother, Precision, will Mind Rape you.
- If you decide to kill and eat Hannibal Lecter's baby sister, don't be surprised when her brother tracks you down and makes a shish-kebab of your cheeks. With mushrooms.
- Gretchen Richter in 1632 is a gender-switched version of this, for her brother Hans.
- Max in Maximum Ride. She's normally a calm and easy-going person. However, she treats the flock like her own brothers and sisters. If you're foolish enough to threaten one of them, you're gonna regret it.
- Thresh in The Hunger Games seemed to take Rue, the girl from his district, in as a sister because when she died, he was infuriated by her death. During the feast, Thresh overheard Clove talking about Rue to Katniss. Thresh grabbed Clove off Katniss, strangled her while holding her one foot off the ground, and yelled at her about Rue. He then kills Clove to avenge Rue.
- You do NOT mess with Thomas Raith's siblings, not even if you're their father. Especially his younger siblings Inari and Harry (who, though younger, reciprocates the sentiment as the Relative Button is a pretty big frickin' deal to him).
Live Action TV
- Scully's big brother Bill. It's really annoying, since this is a woman who has been shown to be able to handle herself time and time again amongst a predominantly male-oriented workplace. She goes out of her way to never be accused of special treatment because she's a woman. And yet she lets Bill push Mulder around all the time.
- It's not all the time. Bill and Mulder meet about twice in the entire course of the series, and though Bill bad-mouths Mulder, the fights between the men usually happen when she's not around. Not to mention Mulder is capable of holding his own in those fights. The annoyance of this trope comes more from the fact that Bill is making assumptions with half the story.
- Also slightly justified when it comes out that Bill has always acted like this as a result of having to be "the man of the house" when his father was away at sea, and that Dana has always taken his opinion with a grain of salt. It's not only Mulder Bill has a problem with, but her having a life different from what was expected of her: joining the FBI rather than practicing medicine, not getting married, having a child out of wedlock...Mulder is only a part of it, though a substantial part.
- And though his little sister is gone for the entire series, Mulder could most definitely count. He's spent his entire adult life searching for and avenging his sister's kidnapping. Samantha Mulder is the reason Mulder works on the X-Files and why he is so determined to uncover the conspiracy. He does not hesitate to hurt or kill someone in the process of finding her.
- Big Bad Kanzaki Shirou from Kamen Rider Ryuki very definitely fits this trope.
- Supernatural has the Winchester brothers. Both of them.
"Whoever said Dean was the dysfunctional one has never seen you with a sharp object in your hands."
- If you think of putting a even single finger on Sammy, you should be fist and gun proof. Or, if you're an angel, messing with Sam to get Dean's agreement is a very bad idea.
- After making Sam watch Dean die over a hundred times in one episode to try to desensitize Sam to losing Dean (it doesn't work; after Lilith kills Dean, Sam turns to The Dark Side for vengeance and the power to save the world) the Trickster/Gabriel comments that:
- You probably don't want to mess with Castiel on Dean's watch (or vice versa) either, although they are more like unofficially adopted siblings
- Lucifer and Michael might have been trying to destroy one another, but Lucifer got pretty vengeful when Castiel Molotov'd Michael.
- Firefly: Don't mess with Simon's little sister. Just don't. And don't mess with River's big brother. Pity the poor Reavers.
- No matter how he tries to negate it, John Casey seems to take that road in regards to Chuck, even though he always claims it's to protect the Intersect. The Casey Doth Protest Too Much, indeed.
- It is revealed in one episode of Malcolm in the Middle that Reese is this to Malcolm, and that was the only thing keeping him from getting beat up for his smart mouth. Malcolm finds this out when his brother decides to be nice for the rest of his life.
- Don Eppes of NUMB3RS. How many people were expecting him to kill someone during "Breaking Point"?
- Justin, from Wizards of Waverly Place, tells his younger sister, Alex, that he always thought he would intimidate her boyfriends if they got out of line, and in "Wizards vs. Werewolves" he fights Mason (who is in full werewolf mode) for her with his bare hands.
- Don't get in between Iris Crowe's little brother and...anything. Just don't.
- Burn Notice: Do not pick on Nate, Michael Westen's little brother. It is unhealthy. As those involved with Nate's assassination in season 6 discovered.
- In the episode "Comrades", there is a deconstruction. Michael meets a Russian woman named Katya whose little sister Elena is kidnapped by the Russian Mafia. Michael has to convince her that being a vengeful big sister might not actually be in the little sister's interest.
- Prison Break: Don't mess with Linc or Michael will come up with an elaborate plan to destroy you. Don't mess with Michael or Linc will kick your ass.
- Buffy the Vampire Slayer:
- Buffy warns her friends in the season 5 finale that she will kill anyone who tries to lay a hand on her little sister, Dawn, True Companions included, even though Dawn's death might prevent the apocalypse, and Dawn is a magical creation only a few months old instead of a natural-born sibling.
- In Season 2, Willow is kidnapped by a group of vampires looking to revive The Master, intending to use her (and a few others) as a human sacrifice. Xander, who blames this on Buffy being depressed and distracted after being clinically dead, threatens to "kill [her] myself" if Willow isn't rescued unharmed.
- Jing Tian from Chinese Paladin 3 boomerangs from having a simple Big Brother Instinct to full on Knight Templarhood. For example, his reaction on seeing his best friend "threatening" his little sister with a Healing Shiv is to attack and nearly kill him.
- Cesare Borgia is this to a somewhat frightening degree in regards to his younger sister, Lucrezia. By the third episode he's threatening to cut her husband-to-be's heart out with a dinner knife if he's "ungallant". He shows some signs of this towards one of his younger brothers, Gioffre. Not so much with Juan.
- In Arrow, Oliver's sister Thea takes a new drug called Vertigo and drives under the influence due to family issues. So Oliver does the reasonable thing and visits her in the hospital, and then he tries to support her legally, especially after the judge wants to make an example of her, and tries to help resolve the family issue that led to the car crash. So why is this entry here? Because he also tracks down the drug lord that made the drug and sells it, known as The Count, and injects him with the very drug in its purest form in an insanely large quantity, leaving him insane due to the drug making him imagine being in the most excruciating pain possible. The episode ends with him spasming violently and screaming strapped to a hospital stretcher as a doctor explains his extreme condition. And he never got NEAR Thea, only being an indirect cause!
- Friends - Ross attempts to be this to Monica after she got engaged to Chandler, stating that if Chandler ever hurt her, he was going to "...hunt him down, and KICK HIS ASS!". The rest of the friends (including Chandler himself) found this hysterical.
- On Youngers, Jodie's brother is this. He threatens to beat Jay up for just looking at her and when Jay breaks up with her, she tells him, which leads to a beatdown.
Myths and Religion
- Absalom from The Bible, who learns that his sister Tamar was raped and humiliated by their half-brother Amnon and, instead of telling their father David to demand punishment, he goes and kills Amnon himself.
- In all fairness, David was already well aware of what had occurred (see 2 Samuel: 22-23). His response was to be 'very angry'... and do absolutely nothing. Absalom decided to take justice into his own hands - it was obvious none was forthcoming from their father, the king.
- In a similar incident, two of the sons of Jacob killed everybody in a village for mistreating their sister. Presumably they wished the feud to end right away.
- To put it into perspective, Jacob's daughter Dinah had been raped by a prominent member of the village who fell in love with her. Despite the circumstances, he and his father wanted to smooth over relations with Jacob's family and offered to pay for her dowry as if she'd still been a virgin, which was actually quite a generous offer at the time. Jacob seemed to warm up to the offer, but his sons demanded that all the men of the village circumcise themselves to become part of Jacob's tribe. The men agreed, with the idea that they would now be able to intermarry with Jacob's tribe. After all the men were circumcised and helpless, though, Dinah's brothers took advantage of the situation and slaughter the entire village, taking only women and children alive as slaves. When Jacob criticized them for the actions, saying that no one would trust him now, they only replied: "Our sister should not be treated like a whore." Jacob went along with this right up until just before he died, at which point he called them in and disinherited them for wiping out an entire village for the actions of one man. (Historians believe this story was written in part to explain why those tribes of Judea were on the bottom of the social ladder.)
- In The Mabinogion, Efnisien gets very angry when his half-sister, Branwen, is married to the king of Ireland:
And thereupon he rushed under the horses and cut off their lips at the teeth, and their ears close to their heads, and their tails close to their backs, and wherever he could clutch their eyelids, he cut them to the very bone, and he disfigured the horses and rendered them useless. And this is just his initial reaction.
- And when Branwen's husband starts treating her like a slave, all her brothers go to war to defend her honour.
- Apollo of Greek Mythology tricked his sister Artemis into killing her almost-love-interest Orion because he didn't want her to break her vows of chastity.
- The filecards for G.I. Joe members Barrel Roll and Bombstrike, and the filecard for Cobra operative Blackout contain a story where Barrel Roll acts as Knight Templar to rescue his sister Bombstrike after blacksheep brother Blackout kidnaps her.
- Gulcasa of Yggdra Union. Serious harm befalling his younger half-sister Emilia induces Berserk Button-level rage, and towards the end of the game—directly after he learns that she has been killed by the Royal Army—said rage causes him to reject Yggdra's repeated pleas for a cease-fire to the war that has effectively destroyed most of his country. Usually, he's a shrewd and reasonable ruler, but in this case...
- Emilia actually inverts the trope in one of the routes of Blaze Union where Gulcasa never discovers his powers (or that they're related), and purposely risks going permanently Ax-Crazy in order to get the power to protect him and the rest of her adoptive older siblings in Gram Blaze. On the chance that she actually does go insane, Gulcasa is left Staking the Loved One, after which he crawls into his Shinji corner and doesn't come out..
- Don't get anywhere near The Legend of Zelda: The Wind Waker 's Aryll, or prepared to be mercilessly hacked into pieces by the Master Sword. Good thing Link's an only child in all of the other games.
- Zelos Wilder in Tales of Symphonia. Though Seles seems to hate him for being born since her mother tried to kill him so that Seles could be The Chosen One instead, but Zelos' mother saved him, and as a result Seles' own mother was executed, he will "throw anyone who so much as looks at her wrong down the Palmacosta harbor". Whoa, dude, chill.
- Mithos Yggdrasil from the same game. He split the world into two and caused everything that leads up to the main plot. His goal? To resurrect his sister Martel.
- Guy Cecil from Tales of the Abyss — his older sister Mary may be dead, but he practically raised Luke. Guy's a pretty chill person normally, but if you so much as threaten one hair on Luke's head, you press his Berserk Button. Especially evident during the Summit, when Jade suggests Luke die in Asch's place, and Guy grabs Jade by his collar, actually yells, and calls Jade a bastard for it.
- In Tales of Xillia 2, this ends up being inverted if you choose to see the bad ending by making Ludger refuse to kill his older brother Julius (Something the latter wants, as he's doomed, and it's the only way to extract a Soul Bridge from him, a key that the party needs to save the world). Gaius proceeds to state that he'll do the deed himself, then things get ugly from there. Really ugly.
- Beat from The World Ends with You makes a Face–Heel Turn in reaction to Rhyme dying; he becomes a Reaper in the hopes of restoring her to life.
- Targeting Axel's little brother is not a good idea, something a repo man learned the hard way at the end of the Axel story. And as aforementioned Dark Hero learned the hard way, do not abduct Adell's siblings or Rozalin's "servants". For any reason at all.
- The plot of Disgaea Dimension 2 can be summed up as this given that Xenolith would allow the Netherworld to transform into something similar to Celestia as well as give up his life if it means saving his little sister Etna. Alas Etna constantly refuses to acknowledge that Xenolith is her older brother even with her life on the line. Of course one particular bad ending has Xenolith fail to save Etna when she refuses to acknowledge that Xenolith is her older brother and destroys the artifact that is destroying the Netherworld with her powers in it. That power ends up killing her and everything he has done had been for nothing.
- And let us not forget that Mega Man and Proto Man are basically teaming up together in 10 to get the vaccines for Roboenza, to cure Roll. Hell Mega Man goes after Wily before he goes after the Robot Masters. Whoever created this virus better have good life insurance. Yeah, Wily's life insurance is up to date. Bastard's still alive.
- Blues in Mega Man Megamix fits the 'morally questionable actions' part of the trope (what separates it from Big Brother Instinct), up to and including threatening to kill Kalinka Cossack if anyone gets involved in the Mirror Match between Mega Man and Copy-Mega Man. Of course, not only was there the risk that they'd shoot the wrong one if they'd tried to help, but Dr. Wily had given Shadowman orders to take advantage of the chaos to kidnap Kalinka. Blues couldn't help Mega Man fight without letting Kalinka get snatched, and he needed some way to keep the other robot masters present from trying to help Rock and causing the Fog of War Wily was going for. If he hadn't threatened her, they would have tried to go through him, and Shadowman would have taken her while he was distracted. By the side of the one with the shield was the safest place for a human among a lot of robot masters with itchy trigger fingers, and he did succeed in saving everyone except Copy-Mega Man. There are plenty of other examples.
- Consider that Wily based his own robot designs on Proto Man's specs. Bass would then be multiple inversions of the trope: he's on a constant mission to destroy Mega Man, and if Wily pisses him off he'll gladly take it out on the other Wily bots...who are also Proto Man ripoffs.
- Any attempt to harm Mega Man X or Zero in the other's presence will result in the survivor of the pair bringing the Big Bad's fortress down on top of you. In later games, if you take out Axl, you now have to deal with TWO pissed-off Knight Templar Big Brothers.
- [PROTOTYPE]: Whatever happens, whoever you are, whatever the reason, never never never harm Dana Mercer in any way, because the consequences for doing so come in the form of her big brother, Alex. Alex is a shapeshifting, superstrong, superfast, superagile, incredibly resilient Humanoid Abomination with issues, and Dana is the one thing in the world he cares about. Alex once prevented Dana's capture by punching through the torso of a soldier wearing body armour. Alex ate a few dozen people who happened to be vaguely connected to Dana's location when kidnapped, and two monsters, and the mastermind herself. Alex is already not wholly stable. Try something safer, like playing Chicken with the sun. And in a wholly depressing twist, Alex isn't even really Dana's brother, simply a virus wearing her brother's corpse like a suit. The real man cared so little about his younger sister that he knowingly condemned her to a hideous death with the rest of the world when he released the virus, before he died and it consumed his remains. This was a man so devoid of love that a flesh-eating virus designed specifically to wipe out humanity cares for his sister more than he did. What a dick.
- It's implied that Joel from The Last of Us was this for his younger brother, Tommy. Considering that they've spent the last twenty years living in a Zombie Apocalypse and Joel lost his daughter within the first hours of the outbreak, you can't blame him for being scared. However, it's implied that Joel did much more than kill people and Infected.
- In Persona 4, acting this way and throwing Namatame into the TV after Nanako's apparent death will get you the worst ending.
- Axel of Kingdom Hearts, towards Roxas. He raises the amnesiac keyblade-wielding Nobody... but he's also a really Poisonous Friend.
- In Grand Theft Auto: San Andreas, CJ finds out that some construction workers have been calling his sister Kendl a hooker. Not only does he bust up the portables at the construction site, but he also traps the foreman in a porta-potty and uses a cement mixer to bury him alive. And all the while, the poor guy is screaming "OH GOD, WHY?!"
- Dirge of Cerberus messes with this. It's actually the little brother, Nero, who goes completely batshit when his big brother is threatened.
- Albus in Castlevania: Order of Ecclesia. Pretty much does everything he can to protect Shanoa in the first half of the game, going so far as to appear a villain for it, until Barlowe is outed, anyway.
- The protagonist of the Japan-only NieR Replicant is The Unfettered when it comes to protecting his sister Yonah (in the Western version, he's instead a Papa Wolf).
- Konoe A. Mercury, better known by her nickname "Nine", of BlazBlue is one of the Six Heroes who battled and defeated the Black Beast. And she happens to be fiercely protective of her baby sister Celica. If she so much as senses that you even consider causing trouble for her (and yes, being a male is enough), don't be surprised when she roasts you with her magic. Worst case scenario, you are blown to oblivion by one of Nine's creations, the GODDAMNED Nox Nyctores Kill Sat Take-Mikazuchi, which is exactly what she did to the Beast.
- In Dragon Age II, the player character can act like this towards their younger sibling, Bethany or Carver. And considering what can potentially happen to them throughout the game, it's no wonder.
- It's much more prominent with Bethany, however, such as when Ser Wesley identifies Bethany as being an apostate in the prologue, causing Hawke to immediately step in front of her and stare down the Templar with a Death Glare. This even happens if Hawke is a mage, putting themselves potentially in the line of fire to protect her. Should Bethany go to the Circle, Hawke similarly threatens to disembowel any Templar who touches her, only relenting when Bethany explains she's going peacefully and by her own accord.
- A possible sidequest in The Godfather 2 involves you being told to beat up or kill someone taking advantage of the quest-giver's sibling.
- In Borderlands 2, it's implied that Scooter acts like the trope towards his sister, Ellie, despite Ellie telling Scooter to leave her alone and stop setting her customers on fire.
- In Until Dawn, Josh turns out to be this. Ever since his sisters' tragic deaths, he went into a great depression and was even went through a major Sanity Slippage. The whole reason for the return to Blackwood Pines lodge was just to get revenge against those whom he blamed for Hannah and Beth's deaths. Depending on the choices made by the player, he may succeed in getting his revenge.
- The Big Sisters from BioShock 2 are the embodiment of this trope. To make matters worse, they are incredible fast, can easily kill you with a few hits, have a lot of health, climb walls, plus they often make mooks spawn and occasionally flood the area which results in visual impairment. They are the reason why most players were happy when the fight for a Little Sister was only against a Big Daddy.
- In Call of Duty: Black Ops II, Raul Menendez is willing to bomb Los Angeles and start a world revolution that could get millions of innocent people killed to avenge the accidental death of his sister Josephina at the hands of Woods.
- Ace Attorney:
- Phoenix Wright is like this with Maya Fey, his assistant and the little sister of his dead mentor Mia. Since this can sometimes be thought to be a Ship Tease by some fans, it is noticeable that he would run across a burning bridge to save her from a cave, and break down a door that led to her after hearing a gunshot in the room. And Maya is also this way towards her cousin, Pearl, as she was enraged when Phoenix suspected her of any wrongdoings in the second game.
- Another example is the Blackquill siblings from Dual Destinies. Younger brother Simon is this towards Athena Cykes (though again this can be seen as Ship Tease by some), as he went through death row for her sake when she was mistakenly accused of matricide, was willing to threaten Phoenix in court if he tried to prove her involvement in a case, and kept insisting that he killed Athena's mother even when he'd be executed for it, if that meant he'd keep protecting Athena. Same with older sister Aura, who held an entire building of people hostage to allow her brother to be acquitted from false murder charges. Guess this runs in the family.
- Clover in Nine Hours, Nine Persons, Nine Doors has a suspicion on who killed her older brother, Snake, in Door 3. In the Axe Ending, when she calculates who the murderers are, she acts on said misconception, killing both Santa and Seven, the suspected murderers, and June, the protagonist's lover for defending them, before turning against the protagonist himself. Though depending on how well the game is played, the players can get the True Ending, where Junpei befriends her and inadvertently stumbles across a crucial clue that indicates her brother is still alive.
- Kaoru "Sou-Banchou" Ichimonji from Tokimeki Memorial 2 is revealed to be this if you romance his younger sister, Akane. And this is the main character's own fault: Sou-Banchou witnessed first-hand how utterly heartbroken the poor girl was was when you-as-the-MC moved outta the city, so he swore to pretty much punch the HELL outta any guy who made her cry.
- Both Keiichi Maebara and later, Shion Sonozaki, from Higurashi: When They Cry fall prey to this syndrome when their non-blood-related "sister", little Satoko Houjou, is abused by her uncle. Winds up leading to some of the most tragic endings of the games. It is also implied that her actual brother, Satoshi did the same regarding the aunt.
- Johan of Anders Loves Maria has long been violently protective of his little sister, Maria. Leads to him committing acts of vandalism and assault in her name.
- Mijuu of Juathuur is Dejoru's overprotective big sister.
- Panthera has Jason, who threatens his best friend Fletcher (who finally got a date with Taylor) as such:
Jason: If you do ANYTHING to her, in any way, shape or form, I will quite literally #%$&!$# EAT YOU. And you have NO idea just how DEEP I could BURY what'd be left of your sorry carcass. UNDERSTOOD?
- Hayden in The Story of Anima is normally calm and sensible, but when his already badass sister Ada is even remotely threatened, he slices the attacker's arm off.
- Broken Saints: Tui Jr, adoptive brother to Heartwarming Orphan Shandala, can resemble this at times, due to his being so hot-blooded.
- Lenny Priestly of Survival of the Fittest v3 will do anything to make sure his twin sister Elizabeth is safe. Literally anything, as he kills people for this reason. Though possibly a subversion, as it has been implied that he used her as an excuse to kill, especially since he went Ax-Crazy and stopped being an Anti-Villain.
- In Dead West, Cedric, big time. His finer moments include burning several churches (only the first was warranted), and dropping a teenager into a huge, steam-powered meat grinder. Feet first. He kind of deserved it. And the way he killed his best friend for molesting his little brother belongs to the Nightmare Fuel page.
- In Brennus, Amy is very very protective of her younger brother Basil, although she doesn't tell him about everything she does. He still thinks some of the Hemogoblins got away. She tore them limb from limb.
- Dee Dee from Dexter's Laboratory may appear to be a flake, but you do NOT harm her little brother. Or she will kick your ass.
- While they're on separate sides, Protoman from Mega Man certainly fits. No one, save Protoman himself, is allowed to touch Mega Man — not even Wily. True, he states that wants to defeat Mega Man himself, but not really.
- Kenny McCormick from South Park displays this in the episode "The Poor Kid". If you have the gall to mess with Karen McCormick, Kenny proves that he Would Hit a Girl quite viciously, as Jessica Pinkerton finds out. The rest of the school gets the hint that the girl is off limits.
- Dipper Pines from Gravity Falls can be this. Though he and his sister Mabel are twins (and he's the younger one), he is perfectly willing to extract some revenge on those who wronged her... even if she doesn't want revenge herself.