History RedOniBlueOni / WesternAnimation

** Earth pony Pinkie Pie is a [[GenkiGirl Genki Pony]] and a {{Cloudcuckoolander}}, compared to Applejack, who is down to earth and more straightforward.

** The Heroes For Hire include boastful LukeCage and restrained IronFist. Their different temperamentals get lampshaded while Iron Fist meditates.

* ''YinYangYo'' has Yang who is the aggressive red oni, and Yin who is the calm blue oni. Their color is inverted as Yang is blue, while Yin is pink.

* ''MonsterAllergy'' has Elena as the red oni and Zick as the blue oni.

** Jazz (Red) and Prowl (Blue) also count in some continuities, especially in the IDW comics and TransformersAnimated.

** One of Wasp's friends, red-clad Comicbook/MsMarvel, confronts invaders with violence, while Ms. Marvel's blue-skinned alien protector, {{Captain Mar-Vell}}, believes in finding peaceful resolutions. Their first appearance, as ordinary Army majors, contained another visual metaphor: Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit.

** One of Wasp's friends, red-clad Comicbook/MsMarvel, confronts invaders with violence, while Ms. Marvel's blue-skinned alien protector, {{Captain Mar-Vell}}, believes in finding peaceful resolutions.

** One of Wasp's friends, Comicbook/MsMarvel, confronts invaders with violence, while Ms. Marvel's alien protector, {{Captain Mar-Vell}}, believes in finding peaceful resolutions. This contrast even gets illustrated through two different visual metaphors: When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

** One of Wasp's friends, Comicbook/MsMarvel, confronts invaders with violence, while Ms. Marvel's alien protector, {{Captain Mar-Vell}}, believes in finding peaceful resolutions. The presence of this contrast even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

** Comicbook/MsMarvel (incidentally, one of Wasp's friends) confronts invaders with violence, while her alien protector, {{Captain Mar-Vell}}, believes in finding peaceful resolutions. The presence of this contrast even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

** Comicbook/MsMarvel (incidentally, one of Wasp's friends) has a similar dynamic with her alien protector, {{Captain Mar-Vell}}. She confronts invaders with violence, he believes in finding peaceful resolutions. The presence of this contrast even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}. She confronts invaders with violence, he believes in finding peaceful resolutions. The presence of this contrast even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}. She confronts invaders with violence, he believes in finding peaceful resolutions. The presence of this contest even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}, which even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.
** The Heroes For Hire include boastful LukeCage and restrained IronFist. The latter lampshades their different temperamentals while meditating.

** Outside of battle, red-clad IronMan often acts more brash and short-tempered than the calm, reflective, and blue-clad CaptainAmerica.

* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': Each type of pony has two representatives, and each duo provides a clear contrast between them:
** Earth pony Pinkie Pie is a [[GenkiGirl Genki Pony]] and a {{Cloudcuckoolander}}, compared to Applejack who is down to earth, and more straightforward.

** Meanwhile, the pegasus Rainbow Dash, is an extremely confident {{Tomboy}} to Fluttershy's [[TomboyAndGirlyGirl shyer and uncertain Girly Girl]].

** The Cutie Mark Crusaders count as well. Scootaloo being the RedOni, to Sweetie Belle as the BlueOni. Applebloom is generally the BlueOni to Scootaloo, and can be either the RedOni or BlueOni to Sweetie Belle.

* ''WesternAnimation/TeenTitans'' has two sets: [[BadassNormal Robin]] and [[GenkiGirl Starfire]] are represented by Red and are more brash, stubborn and passionate then the others (Starfire displays this most in the [[Comicbook/TeenTitans comics]] to which the flashback/origin episode "Go" paid tribute). [[GeniusBruiser Cyborg]] and [[DarkMagicalGirl Raven]] are represented by Blue and are more intelligent, analytical, and in Raven's case, cold.
** That, when they are in combat, but when they just hang along, Starfire and Beast Boy are more on the Red side, due to the fact that they are almost always happy, laid-back and carefree, while Raven and Robin have blue traits, being controlled, calm and down to earth. Cyborg falls in the middle.

** Zuko's DreamSequence, where his [[TheObiWan Uncle Iroh]] is represented by a red dragon and Azula by a blue.

** [[spoiler:Aang and Zuko are taught a different version of Firebending philosophy and forms at least in part by a red and blue dragon. Zuko is being taught to move beyond destructive motivations (his red oni background) while Aang is being taught to accept his destructive potential (against his blue oni background)]]
** Aang is, appropriately enough, a combination of the two. Aang normally can be both foolish and passionate (represented by his normal saffron clothes [[spoiler:and temporary Fire Nation wardrobe change, which he later salvages to make a new set of robes]].) But when in his glowing blue Avatar State, Aang can become frighteningly cold and ruthless, to the point where Aang himself has nightmares about it.
** Also invoked in the last half of the third season, between Zuko and Katara. Katara is constantly angry and emotional, and extremely protective of Aang and her own interests. For once, Zuko is calm instead of passionate, and thinks about how to deal with her. Ironic, in the sense that Katara is typically dressed in blue and Zuko in red.
*** Except, of course, in each of their 'spirit' alter-egoes; the ''Blue'' Spirit, and Katara's reddish Painted Lady. In that commonality, their colour schemes reverse; likewise, in the interactions between just the two of them, they switch roles.
*** Likewise, before [[spoiler:Zuko switches sides]] they fit this but with the opposite roles. Originally Zuko was searching for the avatar, whom no one had seen for a century, as part of a crazy scheme to get back in the good graces of his father (just in time for [[spoiler:conquering the world]]). Katara, on the other hand, seemed to be pushing for a long-term strategy of training the avatar and restoring an earlier period of peace and balance.
** More broadly this applies to the Fire Nation and Water Tribe. This is especially clear in the Siege of the North - the Fire Nation troops are the aggressive attackers whose arguably deluded military leaders (General Zhao and Prince Zuko) are busy with insane schemes ([[spoiler:to kill the Moon spirit]] and capture the avatar respectively). Meanwhile, the Northern Water Tribe are defending themselves, sometimes with the more planned ([[spoiler:but equally unsuccessful) plots to infiltrate the Fire Nation navy]] and seek help from the spirit world. The color scheme throughout those episodes fits this trope to a t - the Fire Nation are typically dressed in red (and black) compared to the Water Tribe who are typically dressed in blue (and white or gray) and even more obviously the moon and night sky become blood red when [[spoiler:the Fire Nation Admiral Zhao begins to kill the Moon Spirit]] foolishly risking the destruction of the earth in order to prevent water benders from bending, thereby making the city an easy target. The response from the Northern Water Tribe is exceptionally non-aggressive, [[spoiler:as the princess, something of an incarnate of the Moon Spirit, sacrifices her mortal life]] with the aim of restoring balance to the world and enabling others to fight against Fire Nation imperialism.
*** Also, the ([[ColorCodedForYourConvenience red]]) Fire Nation and the (green, not blue) Earth Kingdom during [[spoiler:the attacks and sieges of Ba Sing Se]] and the establishment of Fire Nation colonies, where the Fire Nation are pretty clearly the (unsustainably) aggressive party. Of course, the Earth Kingdom has the Dai Li who dress in cooler colors and [[spoiler:engage in more underhanded aggression, like brainwashing]].

*** And, even earth and air, as in red clay. Earth is offensive and air is definitely defensive.

** Tweek and Craig fit this trope, as well. The former is hyperactive, paranoic, anxious, who shows his emotions easily, while the latter has a darker personality, being stoic, pragmatic, monotone and ironic.
* Possibly unintentional, but Blitzwing of ''TransformersAnimated'' has a SplitPersonality represented by his three faces. The black face is TheMadHatter, but the red and blue faces are textbook red and blue oni, the blue face cold, calm, and calculating (and uses ice powers), while the red face is brash, impatient, and agressive (and uses a flamethrower).

** Senitnel Prime is the red who is reckless and an arrogant JerkAss, Optimus Primes is blue far more levelheaded and humble to everyone, ironically Sentinel's primary color is blue, while Optimus is red.
** Then there's Bumblebee who's the KidAppealCharacter, and Prowl who is more mature and more experience in fighting.
* ''SWATKats'': Chance 'T-Bone' Furlong and Jake 'Razor' Clawson. And when they're seen outside their vigilaty and work clothes, they're wearing their respective colors.

* In ''JusticeLeague'', Hawk and Dove, who are also [[SiblingYinYang brothers]] [[spoiler:then one brother and a girl, then two girls, according to the DC Encyclopedia.]]
* In ''WesternAnimation/XiaolinShowdown'' good examples on the villain side are Jack Spicer (red) and Chase Young (blue).

*** And those were their ''first lines'' in the series!

* In the cartoons series for Disney's ''Disney/{{Hercules}}'', Ares the God of war and Athena the Goddess of wisdom who are siblings and rivals were perfect representations of this trope.
* ''{{Disney/Aladdin}}'' the AnimatedSeries: [[TheHero Aladdin]]: Red/purple and white, uses his own strength, lives with a mess of friends, has a monkey sidekick, versus [[DracoInLeatherPants Mozenrath]]: Dark blue and black, uses magic, lives pretty much alone in a ghost city, has an eel sidekick.
* In ''{{Taz-Mania}}'' the Taz/Dingo shorts, Taz plays the role of the HotBlooded red oni while Digeri Dingo plays the role of the cool and cunning blue oni. Also, Molly and Jake with Molly being the easily stressed red and Jake being the more cheerful blue.

* In ''InvaderZim'', Gir seems to show some signs of this trope, though the colors are reversed. The first few seconds when he was active, the episode "Gir goes Crazy and Stuff" and occasionally thru-out the series, Gir's colors switch from blue to red and back again. When red, he seems to show the traits of the Blue oni, and is intelligent, calm, and eager to serve his master (Often Saying "Yes my Master!"). When Blue, he acts more like the Red Oni, and is wild and over the top, with no control over his own urges or actions.
** There is also the scene were Zim hypnotises Dib, and the scene shows the ground falling apart with Zim in red and Dib in blue. Makes sense, since Zim is known for being impulsive and not thinking before acting, where as Dib is more scientific and logical (If only by a little bit)

* Dagget (red oni) from ''AngryBeavers'' is highly emotional and prone to DonaldDuck-esque rages; stark contrast to his older brother Norbert (blue oni), who is cool-headed, and considers himself suave.

* Out of the stretchy superheroes in ''WesternAnimation/{{Batman The Brave and the Bold}}'', PlasticMan, who wears red, is much more blunt and is okay with stealing valuables from the scene of the crime while Elongated Man, who wears purple (it's a kind of blue) is much more analytical and noble. Plas has a similar dynamic with Batman himself.
** Likewise Batman (Blue) and Comicbook/{{Aquaman}} (Red), Atom (Blue) and Aquaman (Red), and... heck, ''anyone'' and Aquaman.
* In ''TitanMaximum'', the original Titan Force Five had the HotBlooded Palmer and his Lancer Gibbs (they even wear red and blue respectively). However the fact that Gibbs was the OnlySaneMan of the team (as well as Palmer leaving him to die just so he wouldn't miss a hot date) led to Gibbs turning evil at the first episode.
* Tiana and Charlotte from ''ThePrincessAndTheFrog''! They also fit the TomboyAndGirlyGirl mold as well, with Charlotte being the [[CuteButCacophonic loud]], over-dramatic, [[TheDitz ditzy]], [[SpoiledSweet spoiled]] dreamer and Tiana being the quieter, more [[CloserToEarth down-to-earth]] working girl. Also one scene has Charlotte in a pink ballgown with Tiana in a (borrowed) blue dress.

* ''TheAmazingChanAndTheChanClan'' has two examples, one with an inversion in color: Sweet-tempered Suzie wears blue while boisterous tomboy Anne has a lot of orange in her outfit, but responsible Henry wears orange while impulsive goofball Stanley wears blue and green.
* Henry and June in ''KaBlam!'': Henry is the red oni (he's energetic, idiotic (not to extreme levels), while June is the blue oni (cool, cynical, smart). With June it kind of makes some sense, she does have blue hair, after all.

** In ''Life with Loopy'', Loopy is the red oni (energetic, life-loving) to her older brother Larry's blue oni (inteligent, shy). Oddly enough,the colors of their hair is are the opposite of the oni (Loopy has blue hair, Larry has red)

* BeavisAndButthead are a borderline case. While both of the boys are active pranksters, and neither of them show good judgement, Beavis is HotBlooded, brash, irritable, and violent, while Butthead is more laid-back, calmer, and (barely) smarter. Ironically, Beavis wears a blue shirt while Butthead wears red shorts.
* Two sets of them in ''WesternAnimation/WingCommanderAcademy'': Payback and Archer (the former is a BloodKnight, the latter often hesitating to end another's life), and to a lesser degree, Maniac and Maverick (Manic is HotBlooded, Maverick is by-the-book enough to have earned an IronicNickname)
* ''WesternAnimation/{{Wakfu}}'' has this dynamic between [[TheChick Amalia.]] and [[TheLancer Evangeline]]. [[RedOni Amalia]] is a RebelliousPrincess who absconds for little reason other than boredom and brattiness. Meanwhile, [[BlueOni Evangeline]] starts as TheStoic BadAss TykeBomb with UndyingLoyalty to the Sadida royal family. She is all about duty and self denial and doing what's right. But as things go on, they both learn from each other and end up reaching more balanced positions on the matter of responsibility. Amalia learns from the example of Evangeline's courage and commitment, taking up challenge of living up to her royal responsibilities and defending the Sadida kingdom at its darkest hour. Evangeline, at the same time learns how to enjoy herself without compromising her duty.
* [[FunPersonified Freakazoid]] and [[TheStoic Cosgrove]] in ''{{Freakazoid}}''. In the episode "Two Against Freak", [[ManInAKilt Roddy]] [[NoIndoorVoice MacStew]] fills in as the Red Oni while Freakazoid is in the hospital. They're even-albeit unintentionally-in the right colors: Freakazoid's in red tights and Roddy's kilt is red, while Cosgrove is always in his blue police uniform.
* Used a bit with the main six in ''{{Recess}}'' when broken into three groups of two

** Spinelli as the red oni (Hot tempered, tough) with Gretchen as the blue oni (smart, laid back)
** Mikey as the red oni (Outgoing, drama king) with Gus as the blue oni (shy, quiet)

* The Revenge Couple on Total Drama; Trent and Courtney. Courtney is a red oni, and Trent is a blue oni.
** Another couple, Gwuncan also fits for this trope, as Duncan is a red oni, while Gwen is a blue oni.

** Outside of battle, red-clad Comicbook/IronMan often acts more brash and short-tempered than the calm, reflective, and blue-clad CaptainAmerica.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}, which even gets illustrated through two different visual metaphors. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.
** The Heroes For Hire include boastful LukeCage and restrained IronFist. The latter lampshades their different temperamentals while meditating.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

*** Wasp's friend, Comicbook/MsMarvel, has a similar dynamic with her alien protector, {{Captain Mar-Vell}}. When they worked together in the same military base, Ms. Marvel wore a red scarf, and Captain Mar-Vell wore a blue suit. In their superhero identities, Ms. Marvel wears a red leotard, and Captain Mar-Vell has blue skin.

** Outside of battle, red-clad IronMan often acts more brash and short-tempered than the calm, reflective, and blue-clad CaptainAmerica.

** Then there's Bumblebee who's well TheBumblebee, and Prowl who is more mature and more experience in fighting.

** Red-clad IronMan often acts more brash and short-tempered than the calm, reflective, and blue-clad CaptainAmerica.

* The ''Dungeons and Dragons'' cartoon featured Eric as the {{Jerkass}} red oni and Hank as the DownToEarth blue oni,

** Then there's Bumblebee who's well TheBumblebee, and Prowl who is more mature and more experience in fighting.

* In ''JusticeLeague'', Hawk and Dove, who are also [[SiblingYinYang brothers]] [[spoiler: then one brother and a girl, then two girls, according to the DC Encyclopedia]].

--->'''Raph:''' Teacher's pet!
--->'''Leo:''' Ninja dropout!

* In ''WesternAnimation/LooneyTunes'', DaffyDuck serves as the hot-tempered, overacting, obnoxious red oni to BugsBunny, who is a calm, cool, intelligent blue oni.

*** [[BeyondTheImpossible And those were their]] ''[[BeyondTheImpossible first lines]]'' [[BeyondTheImpossible in the series!]]

* Inverted with Pablo and Tyrone of ''TheBackyardigans'': Pablo's blue, HotHeaded, and panicked a lot in season 1, placing him as the Red Oni. Orange-furred Tyrone, on the other hand, is calmer and more level-headed, which are true aspects of a Blue Oni.