History BigBrotherInstinct / AnimeAndManga

** Seto Kaiba. He's a total jerk to the main characters, but threaten, kidnap or harm Mokuba in anyway, and he will make you regret it.

* In the ''Manga/WildSeries'', Kiri has a strong caring instinct for his little brother, Mao. Granted, it doesn't stop him from immediately trying to kill Mao when Mao [[ShapeshifterIdentityCrisis loses control of his beast side]], but he probably considered that a favor.

* ''Manga/GunslingerGirl''. The Social Welfare Agency pairs each female cyborg ChildSoldier with an older male veteran who is TheHandler. This pairing is called a 'fratello' due to it's supposed sibling relationship, and some of these handlers end up BecomingTheMask and protective of their 'sister' who's supposed to be an expendable asset meant to protect ''them''.

* ''Manga/GunslingerGirl'': Due to their conditioning, the titular girls are very focused on their grownup "handlers" -- who all happen to be male. On occasion this even turns into a form of puppy love, with the difference that [[SmallGirlBigGun the "puppies" know how to handle dangerous weapons]]... And, in the case of [[spoiler:Elsa]], blow the "handler's" brains out as well as theirs in a murder/suicide [[WomanScorned after he ignored him too much]].

* Also another one for the Big Sister side is Orimura Chifuyu from ''LightNovel/InfiniteStratos''. She may smack Ichika around a lot but don't let that fool you. She dipped out on a world-class tournament championship match to find him after he was kidnapped and has harbored a grudge against that same organization years down the line. And although she doesn't use an IS herself anymore [[spoiler:(for now)]], it is widely known that she is the line in the sand that should not be crossed, as Ichika's BattleHarem knows fully well.

* Ayumu of ''LightNovel/IsThisAZombie'' tries his best to get Eucliwood to call him "big brother," but the closest he comes is being called her "manservant."

* Fujimiya Ran in ''Anime/WeissKreuz'' goes so far as to take his little sister Aya's name after she's rendered comatose; he becomes an assassin primarily to pay her hospital bills, and not only is he fiercely devoted to her welfare, he displays knee-jerk protectiveness toward anyone who reminds him of her. This is most evident in his interaction with IdenticalStranger Tomoe Sakura, but it also flavors his behavior toward several other young women and makes him a BigBrotherMentor toward Sena in ''Gluhen'' and Yuki in ''Side B''.

* ''LightNovel/{{Baccano}}'' has two examples: Maiza, who serves as a sort of BigBrotherMentor to the young gangster Firo (who is supposedly somewhat similar to his biological younger brother, who [[spoiler: was murdered in a conflict over the Elixir of Life]]), and Dallas, an unrepentant JerkAss whose one redeeming trait is his kindness towards his little sister. The three Gandor brothers are also very protective of one another.
* In ''LightNovel/{{Bakemonogatari}}'', Koyomi Araragi used to be a BigBrotherBully to his two younger sisters, and still enjoys teasing them a lot. But whenever he thinks they might be in danger, he goes straight into TranquilFury and at that point ''nothing'' will stop him from getting at the person threatening them.

* ''LightNovel/ACertainMagicalIndex'':

* Shido Itsuka from ''LightNovel/DateALive'' toward his actual little sisters [[NotBloodSiblings Kotori]] and [[LongLostRelative Mana]]. His protective instincts toward the [[OurSpiritsAreDifferent Spirits]] in general could count as this combined with {{TheDulcineaEffect}}.

* ''LightNovel/{{Durarara}}'''s Shizuo Heiwajima is rather protective of his little brother Kasuka (aka TeenIdol Yuuhei Hanejima). The mere act of namedropping Kasuka is enough to make him suspicious of your intentions, while insulting him or attempting to poke into his personal life results in an instant UnstoppableRage. In the LightNovels & second season of the anime, he eventually goes on to develop another Big Brother Instinct towards a young [[TheRunaway runaway]] [[MafiaPrincess Yakuza Princess, Akane Awakusu]].

* Kyon from ''LightNovel/HaruhiSuzumiya'' set himself up as a {{Stoic}} in the novels for ages. Being the UnreliableNarrator that he is, we can all see that he's NotSoStoic. Still, he was just annoyed when Haruhi grabs him by the collar and slams the back of his head onto her table and it was mainly because she disrupted the class.

* Qwenthur from ''LightNovel/HeavyObject'' is tasked with supervising the young Elite Catherine Blueangel, an innocent girl trying her best to resign from the military. Qwenthur quickly develops a fondness for her and becomes uncharacteristically furious when she's infected with a deadly pathogen. At the end of the novel, when Catherine's resignation is refused, Qwenthur and his father conspire to help her desert.
* Issei Hyodou from ''LightNovel/HighschoolDxD'' has a very strong sense of protection towards the younger members of the team, especially the healer Asia whom lacks any kind of offensive power to defend herself. To a lesser extent, he also acts as a "big brother" kind of figure towards Koneko and Gasper, the youngest and smallest (but not defenseless in the slightest) members.

* ''Manga/InuYasha'':

* ''LightNovel/KyoKaraMaoh'': Shori has a certain obsession with protecting his younger brother at all costs.

* Shannon Casull plays this trope straight in ''LightNovel/ScrappedPrincess'' [[spoiler: even if Pacifica isn't his biological sister.]] In fact most of his best moments this trope.

* In ''LightNovel/TheStoryOfSaiunkoku'':

* ''LightNovel/BanishedFromTheHerosParty:'' The person Gideon most wanted to protect the most was Ruti. This was the main reason he joined the Bahamut Knights, so he could guide her until she was strong enough and could find companions that would support her as TheChosenOne. Part of the reason why he left the party willingly was because he thought his wish had come true and she didn't need him anymore.

* Inverted with Bruno Riefenstahl in ''LightNovel/EndoAndKobayashiLiveTheLatestOnTsundereVillainessLieselotte''. The original reason for him to begin training in both swordplay and magic to because he wanted to protect his DelicateAndSickly ''older'' brother August.

* ''LightNovel/MyNextLifeAsAVillainessAllRoutesLeadToDoom''
** Nicol often protected his little sister Sophia from all the discrimination she faced for being {{albino|sarefreaks}} when they were younger. [[BigBrotherAttraction It caused her to develop a crush on him in the game's timeline.]] One of the reasons he ends up falling in love with Catarina in the novel's timeline is her being the first person to befriend Sophia.
** Catarina always wanted a younger brother in her past life, and when she gets the opportunity she becomes a doting older sister to Keith. A big part of the reason she does so is that if she doesn't he'll grow into a playboy whose pursuit of Maria would eventually result in her death or exile, but she also just finds him cute and lovable enough to deserve doting on.

* Gauche from ''Manga/BlackClover'' is fiercely protective of his younger sister Marie, to the point where he tries to kill a sleeping Asta because of her PrecociousCrush on him. He prioritizes saving her over everyone else so much that he leaves Asta, Sister Theresa, and the other children after Baro is transformed into a monster. Marie [[ArmorPiercingSlap punches him]] saying that she hates when he's like this and that she likes him as a Magic Knight who protects others. This causes him to go back to help them.

** While he has a lot to make up for, Ayame definitely cares deeply for his little brother. Since he spent his youth as an AloofBigBrother, he's trying to make up by being there when Yuki needs him. This comes into play when he attends a parent-teacher conference at Yuki's school instead of their abusive mother.

* Inverted in ''Manga/DrStone'' with Kohaku, who does everything she can to protect her IllGirl older sister, Ruri. This ranges from small things like bringing her hot springs water to ease her illness to larger things like disrupting the Grand Bout to keep [[JerkJock Magma]] from marrying Ruri. Ultimately, she chose to ally herself with Senku as he had the medical knowledge to cure Ruri.

** One of his rivals, Natsu Tanimoto, had a sister... but she was an IllGirl and passed away, [[CynicismCatalyst leaving him a broken and bitter young man]]. He quit his gang after one of the high-ranking members kidnapped Honoka and then threatened the girl with a knife. She has since made him her 2nd Big Brother.

* ''Anime/DarkerThanBlack'': There is a ''reason'' Hei goes [[BerserkButton completely nuts]] when his [[strike:Dead]] missing sister is brought up. [[spoiler:Namely, the reason he came to be a badass martial artist in the first place was to protect his Contractor sister. That's right, the normal sibling wanted to protect the one with superpowers. [[BadassNormal And did a pretty good job]] up until [[RealityIsOutToLunch Heaven's Gate]] somehow fused them.]] In the second season, [[spoiler:he starts treating Suou as a substitute little sister. Depending on who you ask, Yin falls into this category as well.]]

* ''Manga/FairyTail'': Mirajane and Elfman are a weird example of this: Elfman (technically the younger brother) is extremely protective of Mira, probably due to [[spoiler: their dead sister Lisanna, for whose death he blames himself]], [[BerserkButton flying into a rage when she's in danger]] and threatening anyone who flirts with her. However, Mira is also deeply protective of ''him'', and rightly so, considering that [[spoiler: she's about a million times more badass]].

** [[TheStoic Masrur]] cares a lot for his young pupil and fellow Fanalis Morgiana. Harming her is a sure way to [[BerserkButton tick him off]].

%%* ''LightNovel/SisterPrincess'' is nothing but this. To an [[TastesLikeDiabetes unhealthy extreme]], in fact.

* In ''Manga/ThePrinceOfTennis'', if you mistreat Yuuta Fuji in almost ''any'' way, get ready to face his older brother Shuusuke's rage. Just watch and compare Fuji's matches with [[GeniusDitz Jiroh Akutagawa]] and [[TroubledButCute Ryoma Echizen]] ([[spoiler: both of them defeated Yuuta but did so ''fairly'', so Fuji holds no grudges and considers Echizen a friend]]) with the one against [[AlwaysCamp Hajime Mizuki]] ([[spoiler: who tricked Yuuta into using a [[DeadlyUpgrade very dangerous tennis move]] without telling him the consequences, so Fuji let Mizuki lead the game for a while and then absolutely trashed and traumatized him in-game]]). No wonder Fujicest is [[YaoiGuys among the most popular yaoi pairings]] in the fandom. Also, lampshaded in the anime when Fuji aids a girl with similar problems towards her older sister.

** Nicol often protected his little sister Sohpia from all the discrimination she faced for being {{albino|sarefreaks}} when they were younger. [[BigBrotherAttraction It caused her to develop a crush on him in the game's timeline.]] One of the reasons he ends up falling in love with Catarina in the novel's timeline is her being the first person to befriend Sophia.

** Nicol often protected his little sister Sohpia from all the discrimination she faced for being {{albino|sarefreaks}} when they were younger. [[BigBrotherAttraction It caused her to develop a crush on him in the game's timeline.]] One of the reasons he ends up falling in love with Catarina is due to her being the first person to befriend Sophia.

* In ''LightNovel/SaiunkokuMonogatari'':
** Seiren is quite protective over Shuurei and to a lesser extent, [[spoiler: his actual younger brother, Ryuuki]].
** A little brother example is Kou Kurou, the youngest of the Kou brothers and proxy head of the Kou clan. When Reishin is accused of tampering with the Imperial examinations, Kurou orders a labor strike that sends the entire capital city into a grinding halt. When Shouka's servants abandoned him following his wife's death and stole most of the household valuables, Kurou had them hunted down.