This troper is constantly mean to his younger brother, but touch him and you'll have a big problem. The same goes for his best friend, although it's less big brother, and more little brother that won't hesitate to castrate you in your sleep.

This seems to happen quite often with this troper, in both ways - I've been the protector and the proctee. :D As a very short and slight(just at five feet) girl with hypothyroidism, nonfunctioning adrenal glands and severe anemia and the inability to open any kind of water bottle/jar/can with her hands, my best friends, who are all tall guys, seem to have a big brother instinct going on with me. On the other hand, I also have a very strong Big Sister instinct over my littler sister (I'm eighteen, she's sixteen) who is very ADHD and sometimes has trouble following social cues, but is very sweet and kind. Once my friend's girlfriend started talking about how annoying my sister was in front of me. They'd never seen me angry until that point, and watching me scream and rant and getting very close to punching someone in the face taught everyone a lesson: Nobody messes with my little sis.

Played straight, inverted, and '''''subverted to all hell''''' with this Troper. Sure, I'm 15 and have a 7-year old little brother, but fellow Troper ROFLightning makes a better big brother than I am. He's my uncle, and we have a five-year age difference. Since I'm a bit of an Absurd Adolescent, I can't take up responsibilities for myself and other people its my uncle! I hug him almost everytime I see him ''at home'', by the way.

This troper grew up around her brother and his friends. Not only has her brother ''always'' had an impeccable "Big Bro" instinct - even when she was a little baby, he would eagerly volunteer to change her diapers...he was eight at the time - but her brothers' friends act as her older brothers quite often.

This troper is fiercly protective of her friend's little sister, who is four years younger than her. I would go to the end of the earth for the kid, and am never hesitant to back her up when she's arguing with somebody. Also, to a greater extent, my younger cousins, five years younger than me, and seven years younger. You know what, just throw in the names of every female friend I have. The Big Brother Instinct has hit the point of total absurdity.

This troper's best guy friend has this with her big time. Normally a very happy-go-lucky, non-confrontational nice guy, when he thought my ex-boyfriend wasn't treating me right, he cussed him out and even threatened to beat the shit out of him. Then again, this sentiment goes both ways. I do make a point of telling his girlfriends that if they ever hurt him, I'll personally scratch their eyes out.

This troper is very brotherly to all his female friends. Just about every single one of them has referred to me as a big brother at one point or another. Upside: Women love to be around me because they know I'll respect them. Downside: nearly impossible to start relationships because girls I become interested in really do think of me as a brother.

{{theburntcheeto}} would like to ask: Are you my clone or something?!

FujinKeima wonders as well..

This editor's younger sister once told him that her boyfriend thinks I don't like him very much (he's wrong but I'm a jackass enough to let him think that) and at another point referred to his "brotherly impulses." Couple that with the fact that on a bad day I look a good deal like pissed off Michael Madsen... yeah.

Given that my brother and I are close in age, and he doesn't and has never needed my help, the big brotherlieness has pretty much passed on to his children (8 & 1 mo.). Like Abby, I know how to ''not'' leave forensic evidence, should the occasion arise.

My older brother and I - despite having a huge age difference - are not just only siblings; We are best friends. Not only he is protective and kind, he'll always be there when I need him. And so will I. We wouldn't let anything bad happen to each other. This is even highenet to the point, because even our body types mach this Trope: I, as a younger female sibling, am shorter and a lot skinnier than my brother, who is about 6 feet tall and has a body of a bouncer.

This troper's friend is (I'll admit, adorably) attached to his three-years-younger sister; he was pretty much beside himself with ~raeg~ when, for the 8th grade dance, his little sister was asked ''multiple times''. It's a bit of a RunningGag among our group how "stereotypically shojo-anime older brother" he acts.

This troper's younger brother got bullied in school. One day, he came asking for help. No problem. The next day, this troper got an MC from the doctor, and proceeded to wait for his brother as he left the gates. When the bully came out, this troper's brother identified him, and watched as the bully got chased, and tackled by this troper. Sure, he admits he's a {{Jerkass}} who kicked a dog, but eh... You don't fuck around with this troper's brother. So far, nobody has dared touch his Nakama. Yet.

This troper definitely embodies this whenever it concerns a certain person that he knows. The certain person is the niece of a friend of his family. There's a gap of ten years between the two of them, this troper currently being eighteen and the little girl being eight at present. He has never had any siblings, younger or older, growing up as an only child but he's always felt protective of her as far as he knows. He still doesn't understand why he's protective of her like a big brother when he's never had any siblings of his own, but he's decided that it doesn't matter. To him, she's already the little sis that he's never had and that's enough for him. She's already been told by him multiple times that if she's ever in trouble or just wants him to drop by, then just give him a call and he'll be there before she can even put the phone down.

This troper is meek, and weak, is quite known for backing away from conflicts. The other week, A female friend was being (Jokingly) Harassed, but it made her feel uncomfortable. Then the Older brother came out, and I stopped them from cornering her.

I may be a bit of a snarky jerkass, but if you lay a finger on any of my (female) friends without the best of intentions I WILL DESTROY YOU. This has, needless to say, gotten me in to trouble numerous times and even landed me in the hospital once with broken nose from a solid punch by a 6'2" + 220 lb football player. I'm 5'6" and under 150 lbs. I managed to rip off his ear as revenge before bystanders called the ambulances in to keep us from bleeding to death. Long story short, he turned out to be a nice guy, the whole incident was just a big misunderstanding and neither of us pressed charges. He's now dating the girl who's honor I was defending. Still has a nasty scar though.

Averted hard in this troper's case. He will leave me in the middle of nowhere with no food, water and shelter for all he cares. For all this troper can remember, he wasn't this much of a {{jerkass}} when the troper was younger.

Averted heavily in this troper's case. The day he discovers his sister is sexually active with a consistant boyfriend, he will get down on his knees and beg said boyfriend to take her away.

Besides this female lurker's KnightTemplarBigBrother tendencies towards her soul sister, she is also very protective of all her friends. It's not uncommon for her to smack them around for fighting with/teasing each other, because ''nobody'' messes with my friends, my friends included. This was all fine when we were still a tight group, but now with numerous fallouts between people and unnecessary romantic drama, I am in a rather uncomfortable situation when my friends badmouth each other to me. Other than the mental stress trying to deal with three separate factions of friends, I've also been locked in a cupboard, kicked out of class and thrown down a flight of stairs for my friends. It's all good, because I wouldn't be anything without them.<3

This troper was (and still is, kinda) very protective of her little brother. When we were little, he was often picked on because he had trouble speaking. Of course, if you valued your life/sanity/disliked having small children yelling at you, you didn't want to make fun of him in my presence. I'm still pretty protective of him now, in that if you mess with him to a point where he's crying (I'm the only one who's allowed to do that), you ''will'' live to regret it.

While there is no documentation of this example, ''this troper'' has had an experience which has a played straight version and an inversion of this trope. The troper was at a party with his younger brother, and tried hitting on a girl he fancied. The drunk ex-boyfriend of the girl didn't take kindly to this and attempted to deflect the troper's advances. The troper's little brother rose to this troper's defense and started a brawl with quite a few ugly drunk bloke. As the fight settled down, the troper and his little brother attempted to vacate the party, but were stopped by the ex-boyfriend and fellow drunk bastards who pile-drived this troper's little brother. So this troper dove in and pushed off drunks twice his size to free his brother and make a break for the car.

My brother is odd. He sometimes has this, yet other times he encourages people to be dicks to me.

Being the oldest of five I probably '''distill''' this in my blood. I feel that everyone one with the instinct has a Godzilla Complex ala "I'm Godzilla, they're Tokyo; NO ONE F!@# with Tokyo but ME!

This troper's a female and doesn't particularly like her siblings that much, but f**k with her little siblings and you won't be walking for about six months while every bone in your body heals. ESPECIALLY if you f**k with her little brother. I'm also this way with any friend I consider "close".

This female troper is this way with both her real little brother and her older best friend. When kids were mercilessly bullying my brother quite a number of years ago (he was in fifth grade, and I was in eighth grade), I took one of them by the shirt collar and told him to get lost...in a less polite way. He refused, so I took my full bottle of ice-cold water and dumped if over his head (in the middle of winter, mind you) before pushing him back rather roughly and telling him "If you ever �*% with my little brother again, you can expect a lot worse than that." And my best friend had a sort of strange former friend who would violently assault her if she refused to have a conversation with said ex-friend. This troper sent her a very purposeful facebook group invitation. The group was called "Hurt my best friend, and I'll make your death look like an accident." Some people would call this bullying, but I call it protection.

This Troper loves and cares for his girlfriend so intensely that he has adopted her as his sister. Because he doesn't ever want to be without her. She loved the idea.

This troper frankly doesn't give a shit what anyone says about his older sister but all of his friends are aware of what happens when someone mocks/insults his younger sister. Not that he's ever told her about this of course.

This long time lurker and new troper acts this way about one of his best friends, who returns the favour. She's three months younger than me, but if either of us get in shit, you just know perpetrator of said shit will be coming home in a small box. To tell the truth I act like this about all of our little group, being the over-protective sop that I am. My sister, who's four years older than me, has grown for the most part out of our sibling rivalry, and she and her friends now seem to have this towards me to varying degrees.

This troper will hurt any guy or girl who hurts his little sister physically. This includes those who are bigger than he is, smaller than he is, and his parents. This likely comes from the seven year age gap.

I WILL defend my brothers, even if they're wrong, and I WILL take on several guys at once if needed, if you even point a finger at them.

I (lower-sixth form; Americans: read junior year) mentor a class of first-years (sixth-grade), and I am fiercely protective of them to the point of accompanying several of the smaller specimens from place to place around the school.

This Troper has a friend of ten years whose younger brother is 11 years old and autistic. Said friend is normally an incredibly nice and gentle person, but if you mess with her little brother, ''you will regret it.''

This Troper's younger sister married one of the nicest guys on the planet. Unfortunately, his father is not so nice, because he had a falling-out with my parents. He does everything he can to make life hell for my sister and brother-in-law, including refusing to show up for holidays and birthdays, sending them passive-aggressive "I-hate-you-because-you-ruined-the-family" notes on Facebook...once he even stated that he did not think their first child should have been born. In true form, he didn't show up for the birth of their second child, either. Most of our family is used to his ways by now, but every so often, his abuse crosses a line that makes this Troper clench her fists and mutter, "Let me at that bastard; I'll teach him to mess with my sister."

This Troper recalls a time when she was about nine and on vacation in Puerto Rico. While at a beach, she saw her little brother, about five at the time, appearing to struggle in the water. Calling for Dad went over her head, immediately swimming towards him. ...Unfortunately, it turned out that with his weight on her, the water was too deep for her, too, so we did have to end up calling for Dad to save us... But I was actually brave!

This, female, troper has adopted a bunch of kids about 4 years younger than her and I warn you now f*ck with them and 5"2 or not I will turn you inside out and make you eat your own intestines. Being somewhat of a pyromaniac as well, I can tell you exactly what colour you'll be when you explode...

With only one younger brother who's larger than I am and can defend himself, most of conflicts come from my friends and reputation. This has gotten me into far more fights than I ever expected. I swear most of those fights come from the fact the bullies just want to take me on just because of my Karate and Jeet Kune Do background. But don't screw around with my friends and family or bullying peeps while I'm around and you won't have to see my serious side come out.

This Tropette is an only child, but knows a little seven year old girl who she loves to pieces. And this little girl has caused me to develop a Big ''Sister'' Instinct. God help you if you bully her.

This troper is very protective towards her younger brother - their relationship is like a less extreme version of that of Gaara and Kankuro in ''{{Naruto}}'' - and cannot stand to see him hurt or upset. She cut her stepfather out of her life because while she could forgive his disregard for her and her mother, she could ''never'' forgive the way he treated her brother.

This troper loves her brother and sister very much. Though her brother has made it quite clear that she should not be worried about him (he is [[{{Understatement}}somewhat]] of a bratty child) and her sister is usually TheOnlySaneMan in certain situations, if they're gone longer than they should be, this troper is a nervous mother hen. If they're in trouble or are troubled, this troper will try to do whatever she can to help them out (though, lately, they don't seem to want it). If they're hurt or shaken physically, emotionally, mentally, or spiritually, God had better fucking help whatever or whoever the hell caused that disturbance because, once I'm done with them, it'll take more than cadaver dogs to find the remains.

This troper has a minor case. I will stand up for my younger sister whenever I feel she has been wronged, but I won't exactly go to violent lengths to do so. It comes from being an Pacifist}} Actual Pacifist.

This troper has a little brother and sister. Her sister is four years younger than her in her late teens, and her brother is even younger than that at sixteen. My childhood wasn't exactly... er... entirely pleasant, so I've grown up with "protect my younger siblings" drilled into me over the years. I don't take it well when someone hurts them, and I take it less well when they're physically or emotionally threatened. Considering that I'm 5''6 and my last two years have been spent in and out of hospitals and doctor appointments, I currently don't have the ability to punch or kick like I used to, and I'm not even handling the chronic pain too well these days. However, if you mess with either of them I will track you down and make your life miserable, and I still prefer to be on the receiving end of any violence or psychological abuse than to watch it happen to them.

This troper is an only child, and my only regret about being one is never being able to convey this trope with an actual sibling. Nevertheless, when around close female friends, I abandon the usual snarky jerk persona and become rather gentlemanly. When they're pushed around, that gentlemanly behavior is replaced by cold fury.

This troper has a younger brother and 4 first cousins, all younger. The six of us are extremely close. We were recently abroad, in a country where this troper was the only one of us fluent in the language. At one point, a few local kids (ages from 12-14) decided that they wanted to wrestle with my cousins/brother. This troper was called into translate, and one of the locals expressed a desire to face my 13 year old cousin one-on-one. As soon as my cousin took the kid down, another kid, 14 but built like Casey Hampton, decided to back up his friend, almost breaking my cousin's arm. This troper (21, 5'11", 200lbs, a taekwondo red belt and former high school wrestler) ripped him off my cousin and made it very clear that if he touched my cousin, I would break him. I sat back down, and the kid ran back into the fray, but before he could get a punch in, he found himself in a rear naked choke.

My Younger brother is a 14-year-old boy with ADHD. He's loud, obnoxious, and makes stupid, tasteless jokes constantly. The only thing that infuriates me more? People who screw with him. Do NOT. Hurt. My little brother.

This 19 year old male troper has two girls who triger a big bro instinct in me, one is 18(and shares my birthday) and lives in Oklahoma, the other is about 14 and lives in the same state as me: Arizona. the first one fully acepts me as a spiritual big brother, she txts me when she needs advice or comferting(heck we talk every day as it is anyway) the second is quite the opposite. As far as i can see she seems to push away and almost seems disturbed by my urge to watch over her, which likely is based on the fact that im one of her only friends who tells her that she ought to stop drinking,doing drugs etc. the rest encourage it. The fist one has never even touched alcohol, drugs or cigarettes. so this is an ironic case since the one who needs me more doesn't want me.

When this troper and her brother were about 4 and 3, respectively, some other kid made her cry at daycare. Later that day, their parents got a call from an irate babysitter that her little brother (who didn't talk, was ''very'' big for his age, and was a bit of a crybaby) had leapt on the other kid and started beating him over the head with one of those stupid plastic beach shovels. ''Much'' later, said younger brother (who now stands 6'2" with nearly seventy pounds more muscle than she has) gave the standard IfYouEverDoAnythingToHurtHer speech to a guy she was going on a first date with (not even a boyfriend yet, or ever). This would be a case where size ''does'' matter, not age.

Averted hard with this troper, whose actual older brother generally lets her sort things out for herself (on the grounds that he knows from experience she's not afraid to fight dirty), and also with an ex-boyfriend. She had to tell him extremely sternly that his interference in her love life was not appreciated, that she was not his little sister and he had no right to get involved whether he approved of her new suitors or not.

There's a somewhat large age gap between myself and my best friend (three years, which is pretty big for highschool). So, I often end up acting the part of big sister for her (whether she wants it or not, unfortunately). One particular (rather painful) moment I can remember is from when I was a Junior and she was a freshman; she'd accidentally spilled soda on her pants at some small youth group thing (it looked like she'd peed her pants, like in cartoons), and was getting a LOT of teasing, to the point where she was on the verge of tears. I'd told the others to come off it several times up to this point, but when I saw the first tear roll down her cheek, something snapped. Next thing I know, I'm half-growling, half-shouting in the face of the others that they would STOP IT RIGHT NOW, or so help me I would strangle the next person to open their mouth. My friend tried to stop me, saying something along the lines of "I don't need you to stand up for me." I growled at her to shut up, I wasn't talking to her, I was talking to them. There was a long moment of awkward silence, and then at that exact moment one of the youth leaders walked in. She somehow managed to move from that to the Bible study, though I still can't remember how she managed to ease the tension. A little bit later, my friend cornered me in the parking lot, and cried on my shoulder for a while. It had been a really hard day for her, and the soda had been the last straw. We made up and became even closer because of it. Ever since, everyone now calls me her bodygaurd, and no one has teased her nearly as much.

This troper's friend is a smallish moeblob who has been picked on for years for various reasons. I have sworn on a number of occasions that if it ever happens in front of her or gets worse, things will get ugly. And I'm not the only one--she's started to amass something of a Big Brother (sister; we're all girls) Squad.

Mess with this (female, but oh, well) troper's little brother, and you're pretty much dead. Oh, and her best friend has this weird brotherly protectiveness thing going on towards her, too.

Although we're not related, I developed this for a fellow classmate of mine. She was about three years younger than me and blind. I knew she could take care of herself, but if I saw someone physically shove her around, God help them because I'd take her cane and beat ''the shit'' out of them.

My older brother has made it clear that messing with me is very bad idea. Not even our cousins are allowed to upset me or hurt my feelings. As much as I appreciate this, it has its downsides. The main one being that most guys are terrified to talk to me or call me on the off chance that he might catch them.

This troper has an older brother who will not hesitate to leave school to come and defend his baby sister. He has no problem hitting kids two years younger than he.

Subverted with my older brother most of the time, but played straight with my older sister. This troper is very protective of his pets. Touch my cats or my dogs, you might end up without a head.

My older brother and I were never really close. Sure we care for each other and do little things, but we don't hang out and our conversations are awkward. On my first job I ended up working with one of his friends. Said "Friend" bullied me relentlessly, the final straw being when he dumped a recycling bin filled with water on me from the roof. I went home in tears. The next day after my brother came home from hanging out with friends, I noticed his knuckle was bruised. When I went to work, the friend had a black eye. He didn't bother me or make eye contact for the rest of the time we worked together. My brother never said anything about it, but I made him his favourite pudding for the rest of the summer.