History RedOniBlueOni / AnimeAndManga

* In ''Manga/{{Bakuman}}'', Takagi and Mashiro; Takagi tends to wear red and is somewhat more excitable and temperamental, while Mashiro wears Blue and is more often level headed. On the other hand, when issues that influence whether the manga they are working on at the moment will get an anime come into play, Mashiro tends to be the one to get impatient and take risks while Takagi is more cautious. Similarly, Miura and Hattori, as Miura tends to lose his temper more easily than the much calmer Hattori does, as while Miura is cautioned to avoid letting artists see him lose his composure, it's noted that Hattori angrily reacting to Mashiro and Takagi going mainstream is [[OutOfCharacterIsSeriousBusiness unusual for him]].

** Factions leaders, [[BigBad Muzan Kibutsuji]] and [[spoiler: his distant relative]] [[BenevolentBoss Kagaya Ubuyashiki]], differ greatly in how they treat their subordinates. Kagaya is a kind, forgiving master, one who is willing to understand others and the world. The Hashira respect Kagaya greatly, viewing him as a type of [[TeamDad fatherly figure]], who suffers terrible woes unfairly. Muzan is the direct opposite, he's a [[BadBoss cruel, dominating figure]] one even the Upper Moons dread to cross or displease. Muzan punishes failure with instant death and mutilation, leaving his underlings terrified and desperate to earn his good favor. Kagaya asks only what his servants can do best, and [[MiseryBuildsCharacter accepts failure gracefully]].

** Factions leaders, [[BigBad Muzan Kibutsuji]] and [[spoiler: his distant relative]] [[BenevolentBoss Kagaya Ubuyashiki]], differ greatly in how they treat their subordinates. Kagaya is a kind, forgiving master, one who is willing to understand others and the world. The Hashira respect Kagaya greatly, viewing him as a type of [[TeamDad fatherly figure]], who suffers terrible woes unfairly. Muzan is the direct opposite, he's a [[BadBoss cruel, dominating figure]] one even the Upper Moons dread to cross or displease. Muzan punishes failure with instant death and mutilation, leaving his underlings terrified and desperate to earn his good favor. Kagaya asks only what his servants can do best, and accepts failure gracefully.

** Shizuo Heiwajima gets two, actually -- when Izaya isn't around, his BenevolentBoss and [[SenpaiKohai middle school sempai]], Tom Tanaka, acts as his blue, complete with meeting the insanity caused on a daily basis with tolerance and {{facepalm}}s. He's not without his moments, though.

** ''Anime/JewelpetTwinkle'': energetic Miria is the red to rational Sara's blue.

** ''Anime/LadyJewelpet'': {{Friendly Rival}}s Momona and Lillian. The former is cheerful and clumsy, the latter is proper and calm. They are respectively represented by pink and purple. This also applies to their respective Jewelpet partners: The ditzy yet energetic Ruby to the stoic and serious Luea.

* Sakuragi and Rukawa from ''Manga/SlamDunk''. Heck, Sakuragi even has red hair; not to mention, Rukawa has blue eyes (anime only).

* ''LightNovel/{{Kampfer}}'': The fiery Akane (when transformed into her Kampfer form) is a stark contrast to the "go with the flow" Natsuru Senō. Another possible matchup is the lovely Shizuku Sangō (Blue) and the childhood friend Mikoto Kondō (Red) Interestingly enough in the series the concept is that the Red team and Blue team are against each other (indicated by the bracelets) and have 1 Red Oni and 1 Blue oni on each.

* In ''Manga/{{Shiki}}'' the passionate doctor Toshio Ozaki pulls red oni duty while his lifelong friend, a melancholy monk named Seishin Muroi, plays the blue oni. Several of the important younger cast members exhibit this dynamic as well: among the girls there's excitable pink-haired Megumi (red) and her friend Kaori (blue) who has more neutral brown hair and a more reserved disposition. Kaori is also the blue oni to her orange-haired brother [[JumpedAtTheCall Akira's]] red oni. For the three main teenage boys, long-time antagonists Masao (red) and Natsuno (blue) have this dynamic, as lampshaded by their mutual friend Toru, who himself falls somewhere in between.

** ''Anime/DokiDokiPrettyCure'': Mana is the red oni to Rikka's blue oni. Also, Alice and Makoto are blue onis to Mana's red. However, when Regina is there, she becomes the red oni to Mana's blue oni.

** In ''Anime/GundamSEEDAstray'', Lowe Guele (loud, dramatic, impulsive) pilots the Astray Red Frame and Gai Murakumo (cool, intelligent, professional) pilots the Blue Frame.

* Noa Izumi and Kanuka Clancy from ''Anime/{{Patlabor}}''. One is a slobbish redhead without a college degree who constantly rushes into trouble; the other is a super-professional MIT graduate with glossy black hair (that looks blue) who never lets any situation get to her.

* In ''Manga/{{Parasyte}}'', the hot-blooded and combative Shinichi is clearly a red oni, whereas the cool, analytical and somewhat unfeeling Migi is a blue oni.

* ''LightNovel/BakaAndTestSummonTheBeasts'': IdiotHero Akihisa to either [[TheSmartGuy Yuuji]] or [[DudeLooksLikeALady Hideyoshi]]. For the main female characters, we have [[{{Tsundere}} Minami]] to [[NiceGirl Mizuki]].

* ''LightNovel/{{Campione}}'': Erica is the Red to Liliana's Blue, and this is even reflected in their choice of clothing. While Erica is pretty bold and passionate about her feelings for Godou, Liliana tries to prioritize her role as a knight first despite obviously feeling attracted to him as well.
* ''Manga/CardCaptorSakura'':

* A classic female example: Kei (FieryRedhead, GenkiGirl, and/or [[{{Bokukko}} tomboy]]) and Yuri (Pale Skinned Blue-nette YamatoNadeshiko with {{Kawaiiko}} tendencies) from ''LightNovel/DirtyPair''. Many of the LovelyAngels teams who [[SpiritualSuccessor followed in their footsteps]] share a similar Red Oni-Blue Oni dynamic.

* ''LightNovel/{{Durarara}}'':
** Shizuo Heiwajima and Izaya Orihara. Masaomi Kida and Mikado Ryugamine (Anri Sunohara as well share Mikado's position) .

--->'''Tom''': You guys never heard of Heiwajima Shizuo? You guys really did go to public school...

--->'''Izaya''': I love all humans!

* Kirche and Tabitha from ''LightNovel/TheFamiliarOfZero''.

* ''LightNovel/FullMetalPanic'': Kaname Chidori and Teletha Testarossa. Their hair bows are a dead giveaway.

* If you look closely, the ''LightNovel/HaruhiSuzumiya'' series contains a very subtle subversion. At first glance, it may seem as though Yuki ([[TheQuietOne quiet]], [[TheSpock rational]], and [[TheStoic unemotional]]) is the Blue Oni to Ryoko's (cheerful, pleasant, compassionate, and somewhat [[spoiler:AxCrazy]]) Red, but actually, it's reversed. Over the course of the series, it's revealed that beneath Yuki's expressionless face exists a complex inner world which comes boiling to the surface in the fourth book/second season, while Ryoko is actually a ruthless and emotionally vacant StepfordSmiler whose [[spoiler:foiled attempt on Kyon's life]] was actually a calculated act designed to prompt a reaction from Haruhi.

** In the 6th episode of the ''[[LightNovel/HaruhiSuzumiya Endless Eight]]'', Kyon wore red swimming and Itsuki wore blue.

%%* ''LightNovel/HighSchoolDXD'':

* ''LightNovel/IsThisAZombie'': Haruna (GenkiGirl, {{Tsundere}}, MagicalGirl) and Eucliwood Hellscythe (TheStoic, SugarAndIceGirl, ReiAyanamiExpy {{Necromancer}}). Alternatively, [[spoiler:Kyouko (AxCrazy, {{Yandere}}, SerialKiller MagicalGirl)]] and Eucliwood.

* ''LightNovel/{{Kampfer}}'': the fiery Akane (when transformed into her Kampfer form) is a stark contrast to the "go with the flow" Natsuru Senō. Another possible match up is the lovely Shizuku Sangō (Blue) and the childhood friend Mikoto Kondō (Red) Interestingly enough in the series the concept is that the Red team and Blue team are against each other (indicated by the bracelets) and have 1 Red Oni and 1 Blue oni on each.
* Ayano and Kazuma from ''LightNovel/KazeNoStigma''. Ayano has a fiery, impulsive, very caring personality, while Kazuma has a calm, impassioned, jaded personality. The colors fit them too; in the OP, Ayano is colored red and Kazuma blue. Kazuma has blue eyes when his power is activated and a general blue theme, and Ayano has red hair and reddish eyes.

* The case of ''LightNovel/LoveChunibyoAndOtherDelusions'' is a bit complicated. Rikka's red to Yuuta's blue, yet when she's paired with her "servant" Dekomori, the latter's red to Rikka's blue.

* In ''LightNovel/MyTeenRomanticComedySNAFU'', Yui Yuigahama is Red and Yukino Yukinoshita is blue. It may help that Yui has orange-red hair and Yukino has been compared to a stream.

** [[BigGood Hashirama Senju]] and [[BigBad Madara Uchiha]] are this as will with Hashirama being the red to Madara’s blue, but after Madara [[GoingMadWithRevaluation goes mad with revaluation]], it becomes the exact opposite with Hashirama as the blue and Madara as the red.

* Shiris and Orson from ''Roleplay/RecordOfLodossWar'' are red oni and blue oni respectively. There's a slight twists, that Orson is also a [[TheBerserker Berserker]] and falls into an UnstoppableRage in combat, but at these times, he's literarly [[DemonicPossession not himself]].
* In ''LightNovel/ReZero'', the twin maid sisters, Ram and Rem, are a literal example of this trope. They are loosely based on the tale of the Red and Blue Onis. While subtle, Ram is the more assertive, teasing one, while Rem is the more submissive, calm one. To further their connection, Ram has red hair, while Rem has blue hair.

* ''LightNovel/{{Slayers}}'' (movie/OVA timeline) has the rather shy Lina with her quiet, unassuming temper of a bounding mine and narcissistic Naga showing off herself but not keeping a teaspoon of powder in reserve -- she isn't wound up at all even when fighting. Lina is leaning toward fire magic and Naga is more inclined to water, though they have personal reasons for this.

* ''LightNovel/IsThisAZombie'': Haruna (GenkiGirl, {{Tsundere}}, ShanaClone MagicalGirl) and Eucliwood Hellscythe (TheStoic, SugarAndIceGirl, ReiAyanamiExpy {{Necromancer}}). Alternatively, [[spoiler:Kyouko (AxCrazy, {{Yandere}}, SerialKiller MagicalGirl)]] and Eucliwood.

* ''Manga/DontToyWithMeMissNagatoro'' has meek, dorky Senpai and the titular, Hayase Nagatoro who frequently teases him. Senpai is a student artist, who for better-or-worse just wants a quiet, easygoing life. Nagatoro does everything to get the boy to open up, taunting and mocking him in a surprisingly wholesome way. Of course, when others actually abuse, Senpai, Nagatoro finds it intolerable. Luckily, Nagatoro's friends (Gamo and co) are just a spunky trio of young misfits.

*** The protagonist Giorno Giovanna is a young thug who makes a living by stealing. He is empathic, unpretentious, has a strong sense of justice, never abandons his allies, and doesn't hesitate to [[NoHoldsBarredBeatdown unleash his rage]] onto those he deems [[CompleteMonster truly evil]], which are typical red oni traits. However, he's also stoic, calculated, and always thinks before he acts, like a blue oni would. Like the other characters, he's [[ColourCodedForYourConvenience colour-coded]] with blue clothes in the manga. His stand has the power to turn inanimate objects into all kinds of plants, animals or other living things, but he always summons specific organisms with a tactical, goal-oriented reason in mind.

** Shizuo Heiwajima gets two, actually -- when Izaya isn't around, his BenevolentBoss and [[SempaiKohai middle school sempai]], Tom Tanaka, acts as his blue, complete with meeting the insanity caused on a daily basis with tolerance and {{facepalm}}s. He's not without his moments, though.

* ''Manga/OnePiece'': The giants Dorry and Brogy are respectively [[RedBaron titled]] "The Red Ogre" and "The Blue Ogre", although they're really a {{Subversion}} as they have [[ProudWarriorRaceGuy basically identical personalities]].

** [[TheChick Nami]] and [[DarkActionGirl Nico Robin]] also fit this dichotomy as the two women aboard. Orange-haired Nami tends to react loudly and angrily to the crew's stupid antics and gets very passionate over money, while black-haired and blue-eyed Robin is introverted to a fault, reacting quietly to everything short of a world-ending crisis.

*** On a much grander scale, [[BigBadWannabe Madara]] becomes the Red Oni to [[spoiler: [[GreaterScopeVillain Kaguya Otsutsuki's]]]] Blue Oni.

*** In terms of archetype, Soulburner can be paired with mature Blue Maiden. Soulburner uses [[PlayingWithFire fire-type Salamangreat]] while Blue Maiden uses [[MakingASplash water-type Marincess]].

*** In terms of archetype, Soulburner can be paired with mature Blue Maiden. Soulburner uses fire-type Salamangreat while Blue Maiden uses water-type Marincess.

* In ''Manga/LuckyStar'', we have [[{{Tsundere}} Kagami]] [[DeadpanSnarker Hiiragi]] (Red) and [[TheDitz Tsukasa]]
[[CloudCuckooLander Hiiragi]] (Blue). With Konata's cousins, we have Yui [[DrivesLikeCrazy Narumi]] (Red) and [[DelicateAndSickly Yutaka]] [[TheIngenue Kobayakawa]] (Blue).

-->'''Tom''': You guys never heard of Heiwajima Shizuo? You guys really did go to public school...

-->'''Izaya''': I love all humans!

** In ''Manga/GundamSEEDAstray'', Lowe Guele (loud, dramatic, impulsive) pilots the Astray Red Frame and Gai Murakumo (cool, intelligent, professional) pilots the Blue Frame.

** ''Manga/JoJosBizarreAdventureBattleTendency'''s main hero and villain. Joseph Joestar, the red oni, is extraverted, ill-tempered, and playful even in the deadliest situations. He gets himself in dire situations when it feels like the right thing to do, uses his hamon powers in experimental and unexpected ways, and figures out life as he goes. The Pillar Man Kars on the other hand, the blue oni, is meticulous, observant and rarely shows emotion. He avoids messy confrontations in favor of well-planned executions, and is fixated on his goal of achieving the pinnacle of all lifeforms.
** ''Manga/JoJosBizarreAdventureStardustCrusaders'' zigzags this. While both Jotaro and Kakyoin are essentially very stoic and collected, the former is more prone to physical violence than the latter.
** ''Manga/JoJosBizarreAdventureDiamondIsUnbreakable'' follows this trope with the main protagonist and antagonist.

** [[BigGood All Might]] and [[GreaterScopeVillain All For One]] have the deadliest of rivalries. All Might choosing to [[BoisterousBruiser punch first then ask questions later.]] While All For One's [[BreakThemByTalking critical logic]] and genius-level analysis backs-up his devastating power.

*** Deidara was also blue compared to his later partner, Tobi who was red. [[BeneathTheMask However in truth it was the reverse.]]
** Despite their hair colors mismatching the trope (at first), near the end of Pein's fight with Naruto. Pein becomes the Red Oni by losing his emotionless attitude and slowly turns drastically infuriated when fighting the enraged Jinchuuriki. Pein's Blue Oni exterior finally faded [[RageBreakingPoint showing what many years of torture can do to you]]. Konan proved to be the Blue Oni after warning [[spoiler:Nagato]] not to over-exhaust his power, and attacks her foes when it is truly personal or she is ordered to. This is a clever example of how both Onis can switch at any time of a story.

** [[spoiler:Toriko literally has a Red Oni and Blue Oni in his body, however their dynamic is [[InvertedTrope reversed]], the Red is more calm and collected where as the Blue is down right psychotic.]]

** ''[[Anime/YuGiohVRAINS VRAINS]]'' pairs the calm, quiet and aloof Yusaku to mischievous, laid-back and energetic Ai. As do the former’s avatar Playmaker's cool-headed and serious towards Soulburner's cheerful, hot-blooded personality.

** [[Anime/YuGiohVRAINS VRAINS]]'' pairs the calm, quiet and aloof Yusaku to mischievous, laid-back and energetic Ai. As do the former’s avatar Playmaker's cool-headed and serious towards Soulburner's cheerful, hot-blooded personality.

** From [[Anime/FullmetalAlchemist the first anime]], there's Winry and Sheska. Winry is extraverted, enthusiastic, and sometimes wears a red bandanna, while Sheska is quiet, bookish, and sometimes wears a blue uniform.