Advance Wars: Days of Ruin has Tasha/Zadia, a Fiery Red Head who is driven by vengeance for her dead brother, and her co-commander Gage/Trak, a The Stoic blue-haired Cold Sniper. They're commanders in the same army and foils of each other. Additionally, Will, the emotional new recruit, and Lin, the older, colder, and more cynical veteran.
HeartAino (red) and Saki Tsuruya (blue) from Arcana Heart. They even have red and blue hair, respectively. And in Arcana Heart 3 there is violently unstable Scharlachrot ('Scarlet Red' in German) and outwardly near-robotic Weiss ('White').
Asura's Wrath has Asura being the loud, hotheaded red who'll jump into combat without a thought, especially if you've made his daughter cry. Yasha is the calm, rational blue who tends to think through his actions before acting on them. Not only do their battle auras match their personalities, it also reflects in their combat styles with Asura tends to punch and smash his enemies, while Yasha uses knife hand strikes and Razor Wind.
The Assassin Brotherhood and the Templar Order from Assassin's Creed are a curious example of Order Versus Chaos. The Assassins (Red) believe in absolute freedom, and that peace can be achieved through trusting humanity. The Templars (Blue) counter that viewpoint as a naive outlook, for they believe society must be directed towards peace through power. Both have killed, murdered and manipulated, many major historical events from the shadows. So whoever is right? Is a decision down to the audience, since both factions are as good and bad as each other.
Gunvolt and Copen in Azure Striker Gunvolt fit the bill with this trope. Color motifs aside, Gunvolt serves as a remorseful, tranquil boy in contrast to Copen with his bloodlust for eliminating all Adepts (Aside from his Luminous Avenger iX incarnation as that one is toned down severely).
The title pair of Banjo-Kazooie involves Kazooie serving as the violent, aggressive Red Breegull to the level-headed, easygoing Blue-Backpack Banjo. This is especially visible when the two of them get the Split Up ability in ''Tooie". Kazooie keeps her flight capabilities, still has her entire arsenal of eggs, has less hitpoints, quick movement, and learns a quick melee attack. Banjo starts out with no attack before learning a slow one, more hitpoints, and learns moves that are more passive and defensive in nature.
Battle Chef Brigade has the cyclops brothers Luis and Louie. They're notable because they're two heads on a single body.
Ragna and Jin. Iron Tager is actually nicknamed "The Red Oni" (or "The Red Devil" in the English version), but this has to do with his fighting prowess and physical resemblance to one, and he's actually the Blue Oni paired up with his Red Oni Sector Seven compatriot Makoto Nanaya.
Ragna and Jin subvert this since, free of any outside influences such as an out of control Azure Grimoire and Yukianesa, both of them are actually pretty hotblooded, though their values are different.
Speaking of Jin, his classmates also count - Tsubaki Yayoi is a calm, reserved blue, while Makoto Nanaya is an eager, energetic red.
Of Lord Tenjou's two surviving disciples, Bang is the Red Oni, and Kagura is the Blue.
III has a mild case of this with Garr (red) and Gaist (blue) ( at least, before Gaist dies). Their horns are even conveniently color-coded.
IV plays this trope straight with Ryu (Red) and Fou-lu (Blue); literally the only deviation would be that these two are not literally oni but rather Split at Birth halves of a draconic god. (Fou-lu is, in fact, a literalGod-Emperor who gets driven down a Trauma Conga Line and ends up ultimately a Woobie, Destroyer of Worlds). Also, the Comic-Book Adaptation of the game and concept art play this so straight, in fact, that literal Dragons Up the Yin Yang comparison is made of Ryu (yang) and Fou-lu (yin).
In Carrie's Order Up!, the player character Carrie is energetic, enthusiastic and generally cheerful. Her coworker, Calcia, on the other hand, sports a constant frown and is generally grouchy and self-centered.
Castlevania: Rondo of Blood has the young, cheerful, and energetic Maria Renard as the Red Oni compared to Richter Belmont being the calm and cool Blue Oni. Even their clothes portray this, with Richter wearing blue and Maria wearing pink.
Castlevania: Curse of Darkness has Isaac as the Red Oni, who is emotionally-driven, vengeful, and passionate; Hector, on the other hand, is the Blue Oni. He's told - and tells himself - often to keep his cool and not get all 'riled up' by Isaac's antics so as not to be overtaken by Dracula's curse. Their official wallpapers make their convenient Oni colour-coding clear, if we didn't catch it the first time.
Castlevania: Portrait of Ruin also included Jonathan, the hot-blooded Red Oni, and Charlotte, the collected Blue Oni. The Twins Stella and Loretta also fit this trope, Stella being a bit more hands on with her swordplay and Loretta using her spells to attack from afar. Both pairs also have this evidenced in their attire: Jonathan and Stella having a much warmer color scheme and Charlotte and Loretta having a cooler tone.
Toby is hyperactive and talkative while Jonny is stoic and quiet.
Also, Vincent's girlfriend Katherine is a blue oni and the titular Catherine is a red oni. They even wear the corresponding colours on their outfits (Catherine has a red waist ribbon and Katherine has a blue belt).
Chivalry 2's Excuse Plot has two warring factions, Color-Coded for Your Convenience. The Mason Order (Red) is all about strength and dominance over the weak. The Agatha Order (Blue) view themselves as rightful rulers, and hold loyalty, duty and honour in high regard.
Ice-wielding Marle is outgoing, friendly, and impulsive; fire-wielding Lucca is a levelheaded Gadgeteer Genius.
To a lesser extent (Due to lack of personality/character development) there are a trio of bosses, including a Blue Beast and Red Beast (Palette swapped versions of each other). They absorb water and fire respectively.
Clock Tower 2: The Struggle Within had its split personality deuteragonists Alyssa (Blue) and Bates (Red, despite glowing a blue-ish purple). Alyssa, while not completely defenseless, is reliant more on evasion and use of the environment, as well as generally being the more sensible, meek, and sociable side. Bates, meanwhile, is an Ax-Crazy sadist who is both arrogant and quick to violence; he prefers using guns and direct assaults, and is responsible for more than a few bad endings where his taunting and overconfidence gets the two killed.
In Crash Bandicoot, Crash is the quirky, simple-minded and clueless Red bandicoot to Coco, his genius, ambitious and wise Blue sister. Crash is also Red to his creator Neo Cortex's Blue. Crash hardly thinks during his antics, running on wackiness and dumb luck. Cortex however always has a scheme, and very often bounces back from his failures.
In Cuphead, Cuphead is the hot-tempered red oni and Mugman is the soothing blue oni. While both have a rebellious streak, Mugman does try to stop Cuphead when he gets overconfident betting against King Dice and the Devil.
The Cursed Crusade follows Denz de Bayle, a calm, intelligent Templar knight who is calm when confronted by the various effects of the curse, including fighting Death itself (blue), and Esteban Noviembre, a Spanish mercenary who is far more lively and emotional, as well as far less experienced with the effects of the curse, and as such very unnerved when dealing with it (red).
Between the two main ninja girls are the honorable and kind Reluctant Warrior Kasumi as Blue and her anti-heroic Tsundere half-sister Ayane as Red.
Lei Fang gets two Red/Blue pairings with Jann Lee and Hitomi, with her being the Blue in both of the pairings due to her elegant appearance and fighting style as well as her Proud Beauty status. Meanwhile, for her Reds, Jann Lee is hot-blooded and hammy, whilst Hitomi is cheerful and energetic.
Helena is elegant, regal, and polite (Blue), whilst Christie is brash, rude, and sadistic (Red).
The ladylike Marie Rose who wears Lolita fashion (Blue) contrasts with the upbeat and bubbly Honoka who wears a school uniform (Red).
Between the male characters, we have the loud and arrogant Bass Armstrong (Red) with the stoic and calm Rig (Blue).
In Dark Souls III you encounter Sister Friede (blue) who wields a scythe and ice powers, along with a softer melody theme during battle. Father Ariandel (red) soon joins the fight, armed with a huge cauldron and fire powers of which the boss theme then intensifies to an epic double battle.
Dead Rising has Carlito (red) being hotheaded and losing his cool while his sister, Isabela (blue) is calculating and calm.
Dead Rising 2: Case West has Chuck Greene (red oni) and Frank West (blue oni).
Riviera: The Promised Land has red-themed Ledah with a blue personality and blue-themed Malice with a red personality.
Yggdra Union has twin sisters Luciana and Aegina; while Luciana is red and Aegina is blue, Luciana's trademark colors are black and blue and Aegina's is red.
Knights in the Nightmare has Maria, Marietta, Meria, and Melissa. Maria and Marietta have red-and-gold coloring with blue personalities, while Meria and Melissa have blue-and-purple coloring with red personalities.
Markus and Connor from Detroit: Become Human. Markus is a deviated android who leads a resistance group of Jericho to free androids from human oppression and shows much emotion, while Connor is a programmed android who hunts down androids who have deviated from their programming and doesn't show much emotion. Even if the latter becomes a deviant, he maintains a cool head.
North and Josh. The former wants to be free from human oppression using violence, while the latter wants to be free using peace. It's up to Markus on whose opinion will he follow to gain freedom for their people.
Dante/Vergil is the prominent example, along with having their respective color-coded outfits. From their characterizations in Devil May Cry 3: Dante's Awakening, Dante is the red-clad protagonist who's arrogant, sarcastic and impetuous, while Vergil is his blue-clad antagonistic twin brother who's somber, stoic and ruthless.
Dante/Nero is at least a partial inversion. Nero, wearing blue, is the one prone to emotional outbursts, though he is still pretty levelheaded. Dante, wearing red, is the mysterious and somewhat more stoic one, though he still keeps his brand of wacky. In Devil May Cry 4, he spends a boss fight getting Nero to cool off. Dante progressively becomes more Red during his own section of the game, though not by much.
Devil May Cry 5 retains most of the aforementioned dynamics but plays a bit with them and adds more comparisons thanks to Character Development and new interactions; Hot-headed red Nero tags along with a much more level-headed blue Dante. Dante however, remains much more passionate and red than his controlling blue twin, Vergil. Vergil is also a blue counterpart to Nero, although this is only seen in the final boss fight between the two. Nero is more aggressive and direct than the calm and thoughtful V.
The Demon Lords Belial and Azmodan in Diablo III. Belial, the Lord of Lies, tries to get what he wants through subtlety, manipulation and deception, and only resorts to combat after his schemes have been uncovered, while Azmodan, General of Hell's armies, brashly announces his presence, constantly taunts his enemies and gets what he wants through overt military aggression.
Heat, the short-tempered, impetuous, and eventually antagonisticLancer who transforms into the fire demon Agni, and Serph, the rational, calm, and almost emotionless leader who transforms into ice demon Varna in Digital Devil Saga.
Disgaea has the red-haired Demon Etna and the (white-)blue clad Angel Flonne, both with quite different methods and personalities but the common goal to make Demon Prince Laharl a good King.
In the fourth installment, there's Fuka and her little sisterDesco play this trope straight and invert it. Fuka has a brash, aggressive personality and takes baseball as Serious Business and Desco has a cutesy, cheery, and kinder type personality. However, their interests conflict with their personalities. Fuka wants world domination and have stereotypical interests in several girly things like sweets and dress-up while Desco desires to be a Final Boss someday and cause total massive destruction.
In .hack//G.U., Haseo and Ovan. Haseo is a fiery, obstinate Jerk with a Heart of Gold, while Ovan is calm, smooth, calculating, and manipulative.
The sisters Lina (red oni) and Rylai (blue oni). They also have certain zig-zagging elements. While Lina is definitely fiery and passionate in personality, she's more of a loner and smart. Rylai is calmer and more composed, but she's quite the social girl and rather naive.
Also the Moon servants Luna (red oni) and Mirana (blue oni). Luna is an aggressive Blood Knight with Violent Glaswegian accent, while Mirana is a composed Lady of War Princess.
The haughty, arrogant, supremely talented Invoker (blue) to the adaptable, adrenaline-junkie, power copying Rubick (red).
The professional teams Natus Vincere (red), a high-octane, risk-taking team, and The Alliance (blue), who are cool-headed and formulaic, and DK (purple), who lie somewhere in the middle.
Oghren is definitely the Red Oni of the Warden's band with his ferocious berserker nature and his massive red beard; the Blue Oni is usually Sten.
At the very beginning, the emotional and somewhat childlike Alistair is played as the Red Oni to the icy and calculating Morrigan's Blue Oni.
In Dragon Age II, Isabela and Aveline take on these roles. Also a Sibling Yin-Yang pair in which sweet, kind logical Bethany serves as the Blue Oni, and Hair-Trigger Temper Carver serves as Red.
In Dragon Quest V, the Hero (red), is emotional, impulsive and prone to jump into a dangerous situation, regardless the consequences; whereas Prince Harry (blue), is -post-Character Development-, quiet, cautious and tends to think before speaking and acting.
In the series' backstory, during the Alessian Revolt against the Ayleids, Alessia is the Blue to Pelinal Whitestrake's Red. Alessia was the escaped slave who prayed to the Aedra for aid in freeing her people from the (primarily) Daedra-worshiping Ayleids. The Aedra answered, offering a Bargain with Heaven. Part of the aid they sent was the God in Human FormBerserker, Pelinal Whitestrake, to serve as the champion of Alessia's armies. Pelinal was extremely effective in fighting the Ayleids, a One-Man Army who could Paint the Town Red with Ayleid blood. However, he was also extremely racist toward elves, Ayleid or otherwise, and was prone to fits of Axe-Crazy psychopathy. During one particular fit of Unstoppable Rage, he damaged the very lands themselves in such a way that the Aedra nearly left the world in disgust. Alessia had to offer prayer and was forced to make sacrifices in order to regain their favor.
General Tullius and Ulfric Stormcloak. The trope is inverted, though, as Tullius is a military genius, levelheaded and calm. His army wears red, whereas Ulfric, who is a brash Nord warrior, both wears blue and outfits his army in it. The Imperial Army and the Stormcloaks also invert this trope, as the Imperials are often more calm and level-headed but wear red, while the Stormcloaks tend to be arrogant, proud and even racist but wear blue. Hadvar and Ralof are the first examples of both sides attitudes. The game also paints the Imperials and Stormcloaks as Mirroring Factions rather than completely opposed.
The Imperial Army are also the Blue, to the Aldmeri Dominions Red (especially concerning the Thalmor). The Imperials allied but never truly trusted the Aldmeri Dominion, this was because the Dominion was a supremacist faction. It's wise to assume, that the Stormcloaks were merely doing exactly what the Dominion wanted, for if the Empire was destroyed? The Dominion would takeover, further subjugating the human races and Skyrim would most likely be invaded.
The Blades (Red) are hot-headed and endlessly ambitious in their quest to slay all dragons, while the Greybeards (Blue) are calm, secluded mentors. And once The Blades tell you to slay Paarthurnax you have to make one of the biggest decisions in the game and choose to join one of the sides while the other outright despises you.
The players choice of play style also can explain a lot. The Warrior Constellation is shrouded with red, it's the most physically demanding and brutal choice. The Mage Constellation is shrouded with blue, it requires learning spells and knowledge similar to school. The Thief Constellation is shrouded with green, it involves mostly stealth and patience being both physically and mentally superior.
Atsuma and Touya of Enchanted Arms fit the trope almost perfectly: seeing as how the game contains more than a few gaming/character stereotypes, this should be no surprise.
Though they've been around for decades before its time, the storyline of the Epic Mickey games gives this trope to Mickey Mouse and Oswald the Lucky Rabbit. Written to portray the two as long-lost brothers, Mickey is — of course — the happy Red Oni who's always looking on the bright side of life. And it's through his foolishness and curiosity that the story takes off. His "older brother" Oswald — donned with appropriately-colored shorts — is the Blue Oni who is bitter and solemn due to the traumas of his past. In the first game, his character is shrouded in mystery for quite some time, and the people of his kingdom seem to both admire and fear him. By the second game, the two have developed a strong friendship and are massively protective of each other.
Ensemble Stars! has this with its primary duo, Subaru and Hokuto. (Subaru is the poster boy of the game, but Hokuto is the actual leader of the focus unit Trickstar.) Subaru has bright orange hair and a very cheerful, enthusiastic disposition, constantly seeking fun and driven by his own whims. Hokuto has black hair and is reserved and stoic, a Class Representative who tries to react to the world logically and is often the one to veto Subaru's more ridiculous ideas.
Salsa (red) and March (blue) from Eternal Sonata. Even their hair are the respective colors!
The two primary leaders in Evolve have this dynamic. Cabot (blue) is more experienced with hunting wildlife and prefers calm professionalism, while Parnell (red) has experience with military combat and tends to risk his own neck more then is healthy. Amusingly, both were members of this dynamic in the past in the opposite position. Cabot was brash and reckless as a young man, while his partner Bucket was levelheaded and rule-abiding. Pre-Heroic BSoD Parnell tried to take the safest course of action with his crew, while Abe was the reckless one.
Friday Night Funkin': Two mods (Starlight Mayhem & VS Ghost Twins) have this: For the former, CJ is the confident, energetic and outgoing one, and Ruby is the shy, timid and reserved one. For the latter, Marie is the energetic one and Tanner is the more soft-spoken one.
Final Fantasy IV's Palom and Porom are Polar Opposite Twins who also fall into this trope. Palom uses Black Magic; he's brash and always getting himself into trouble. His twin sister Porom uses White Magic; she's studious, dutiful, and constantly smacking her brother upside the head to get him to behave.
In Final Fantasy VI, Terra is not as extroverted and forceful as a typical Red Oni, but is much less reserved and more interested in understanding her emotions than Celes, who is an intellectual, reserved former general and initially adverse to socializing and expressing her emotions. In a game without a true main character, the two are the closest candidates for the position of protagonist. It helps that the two have Personality Powers: Terra naturally learns fire magic while Celes naturally learns ice magic. Also, there are traditionally three females in each playable party: first being red, second being blue, and third somewhere in between.
Also, there's GeneralLeo being the Blue Oni to Kefka's Red Oni.
Tifa as the Blue Oni in dark clothes and Aerith as the Red Oni in red clothes. Played even straighter with their Wall Market dresses, respectively blue and bright red.
Cloud, while he'll show off whenever he gets the chance, is collected and thoughtful, with his flashiness being mostly a self-consciously cool persona. He's generally associated with purple, blue, white or black, and comes equipped with Ice magic at the start of the game. Barret is a loud Hot-BloodedLarge Ham who wears his emotions on his sleeve (there are several occasions where he's explicitly described as crying, while the closest Cloud ever comes is acknowledging that his eyes were burning). He wears mostly warm tones, uses bullets and fireballs as weapons, and has a tattoo featuring fire. Note also that Cloud's highly personal Duel to the Death quest is patterned after samurai tropes while Barret's is based on Spaghetti Western tropes, suggesting Samurai Cowboy.
Zack's optimistic, vibrant, Hot-Blooded, more experienced than Cloud and (in the original game, anyway) goes out with women without letting them tell their mothers. In Crisis Core he uses the blunt edge of his sword and is motivated by justice and heroism. Cloud's pessimistic, thoughtful, sarcastically witty, and more innocent - but he can be ruthless, is motivated by revenge, and always uses the sharp edge of his sword.
In Final Fantasy VIII, protagonist Squall is The Quiet One, does his best to be a Consummate Professional, and wears black, while his Rival Turned Evil Seifer is dramatic and impulsive, models himself after his "romantic dream" of knighthood, and wears white. On a smaller scale, the Biggs and Wedge pair in VIII are also a colour-coded example of this, Biggs is brash, aggressive, and ambitious; Wedge is his cool-headed, reserved, and long-suffering subordinate. Raijin and Fujin also qualify.
Final Fantasy IX has Zidane and Kuja, which sort of makes sense when you consider they're brothers. It is later subverted: Zidane becomes a lot more responsible and thoughtful, while Kuja becomes an Omnicidal Maniac. Even the planets Gaea and Terra are color-coded according to this convention.
The colors are reversed in Final Fantasy X, with Hot-Blooded and impulsive Tidus as a red oni associated with the color blue and The Stoic Auron as a blue oni associated with the color red. Seymour, the main onscreen villain, also plays blue oni to Tidus' red.
Final Fantasy X-2 has Yuna positioned between red Rikku and blue Paine.
In Final Fantasy XIII, Lightning is outwardly cold and professional with a former past in the military. Fang is flirty and cocky and comes from an ancient tribe of warriors. Lightning's outfit is white with a red cape, while Fang's outfit is black with blue sashes. The parallels extend to their Eidolons - a white knight and a black dragon. The game also plays with this in another way: Lightning acts like a blue but her plan to save cocoon basically involved going nuts and killing anyone who stood in her way, whereas Fang acts like a red but was the only l'Cie that had anything resembling an actual plan to save humanity. Also, Snow and Hope invert this trope. Snow, the Hot-Blooded character in blue clothes, is the Red Oni in comparison to Hope, the level-headed character in yellow and orange clothes, who is the Blue Oni.
Fang and Vanille also play with the trope. Vanille has pink-orange hair, wears pink, and is the more outwardly emotional, but it's she who makes the Needs Of The Many decision to abandon her Focus and let herself turn Cie'th for the sake of Cocoon. The blue-wearing Fang is generally more mature and level-headed, but it's she who is willing to endanger millions of lives in order to save Vanille.
Nabaat and Rosch subvert this as PSICOM officers. Going by their first appearances, it seems like Nabaat is the Red Oni while Rosch is the Blue Oni, as Nabaat shows some compassion and warmth as she watches over Sazh and the newly-branded Dajh, in contrast to Rosch coldly lecturing and reprimanding his underlings at swordpoint. However, in reality, Nabaat is the Blue Oni while Rosch is the Red Oni, Nabaat's empathy is a front to hide a cold sadistic streak and in XIII-2 shows she's unafraid to throw her underlings away, whereas Rosch is much more affected by what he has to do than he lets on and admits to Snow that he doesn't want to be involved with such actions as the Purge but has no choice and later regretting opposing the l'Cie despite their shared goals.
In Final Fantasy XIII-2, Noel is a Blue Oni relative to Snow (complete with color-coding), but a Red Oni relative to Caius.
Final Fantasy XIV has twins Alphinaud and Alisaie Leveilleur as the blue and red oni respectively. Alphinaud is associated with the color blue and is the calm and diplomatic one, while Alisaie is associated with the color red and is more brash and emotional. This is also shown in their fighting styles: Alphinaud plays exclusively magic wielding classes and is a healer, while Alisaie combines magic with melee attacks and is a damage dealer.
In World of Final Fantasy have the twin protagonists, Lann and Reynn inverted it. Lann is wearing blue but really focusing on fighting and rather Book Dumb. While his sister, Reynn is wearing red but focusing on the enemy's weakness before attacking and rather Smart. Although, there are times Lann acts calmer than Reynn. Especially when Reynn freaks out about ghosts and creepy supernatural or she been pissed by Cactuar Conductor.
Most games give you two near-identical horse-mounted knights at the beginning of the game: one will wear red armor, have an outgoing/reckless personality, and have more Defense and Attack power, while the other wears green, behaves modestly, and specializes in speed and accuracy. It fits the trope better once you remember that the Japanese, like many other cultures, don't fully distinguish between green and blue. Blazing Sword goes and inverts it — Sain, Chivalrous Pervert, is in green and Kent, his superior in both rank and self-control, is in red. Another inversion in Blazing Sword occurs with two of the main lords: brash, blue-haired Hector and calm, formal red-head Eliwood.
An odd variation occurs in Lex and Azel of the fourth game. Red-haired Azel is the gentler of the two, but more emotional and impulsive, while blue-haired Lex is Hot-Blooded and gruff-speaking, but more laid back. So, for them, this trope is both played straight and subverted.
Even though they never appeared in a Fire Emblem game together, the Super Smash Bros. incarnations of Marth and Roy are portrayed this way on the crossover series. The red-haired Roy's voice clips consist mainly of loud, passionate grunts and Kiai screams, and as a fighter, his raw power and speed is probably his greatest asset, and in the fourth game, his sweet spot is near the base of his sword, making him best in extremely close-range combat. The blue-haired Marth, on the other hand, speaks in a breathy, almost whisper-like tone, and he relies more heavily on grace and finesse than brute strength, with a strategy mainly based around hitting opponents with the tip of his sword and therefore requiring players to space him properly for maximum feedback. This only really applies when one disregards their win quotes, however, where Roy has lines fitting for his status as a Blue Oni in canon, and in fact Marth sounds more emotional.
From Tellius games, Gatrie (blue armor) and Shinon (red hair). At first they seem to subvert it, with Shinon the cool-tempered one and Gatrie the bumbler, but the former turns out to have quite a temper as well as a drinking problem and the latter is pretty laid back. And then of course, there's the Red Knight/Green Knight duos of Oscar and Kieran (Fire Emblem: Path of Radiance) and Geoffrey and Kieran (Fire Emblem: Radiant Dawn). And among the beast laguz, there's Lethe the spitfire and either Gentle Giant Mordecai or laid-back Ranulf.
Another example of this could be Vaike and Chrom, with Vaike being way more Hot-Blooded than Chrom (Chrom isn't exactly a calm guy). Vaike sees himself as Chrom's one true rival, and although Chrom doesn't want to fight him all the time, he does respect him as a fighter, friendly rival and fellow shepherd.
Fire Emblem Fates breaks the knight trend somewhat by applying this motif to a duet of ninjas: the Hot-Blooded Red Ninja Saizou and the calm and composed Green Ninja Kaze. Kagerou is another Blue Oni to Saizou, as she tends to restrain him.
Sisters Felicia and Flora. Felicia is peach-haired, emotionally expressive and clumsy while Flora is blue-haired, collected and serious. Oddly enough, Felicia has a blue gem on the collar of her uniform, while Flora has a red gem.
Keaton and Kaden end up becoming this (and a Boke and Tsukkomi Routine) in the Revelation third route. Both are leaders of a tribe of animal shapeshifters that can turn into a canine creature (a werewolf and kitsune, respectively). While Kaden is a calm, hard worker with I Owe You My Life ethics, Keaton is a carefree, energetic individual, much like a dog. Their choice of dress also shows this, with Keaton being a Sharp-Dressed Man and Kaden being much more casually dressed. Their daughters Selkie and Velouria flipped this. Selkie is hyperactive and playful, Velouria is more calm and prefers to not speak if not talked to.
Also applies to the two main characters, the Avatar and Azura. They're both royal children of two worlds who were kidnapped at a young age and raised by the enemy nation. Because the Avatar grew up with loving siblings while Azura was mostly isolated, they ended up with different attitudes: the Avatar is openly friendly and emotional, whereas Azura is stoic and wary.
The two kingdoms and their rules, the glory-seeking Nohr and their power-thirsty king Garon, and the peace-loving Hoshido and their calm queen Mikoto. Arguably, the serene Mikoto is also the blue to her blatant older sister Arete, her Blood Knighthusband Sumeragi. Ironically, the first generation royal siblings of Hoshido are all Red to their respective Nohrian counterpart ,which extends to the second generation princes, but only youngest first generation princesses are as blue or red their kingdoms' title suggest. To list:
First generation crown princes Ryoma and Xander are this to each other, as part of both being a Foil to the other. Ryoma is a Hot-Blooded, honor-driven samurai who is quick to anger, intensely emotional regarding his family and country, and once he believes the enemy has crossed the line, he will stop at nothing to utterly destroy them. Xander, by contrast, is calm, calculating and more than a little moody, preferring to use careful tactical planning over emotional, spur of the moment decisions. Ironically, this ends up being flipped in Revelation. The Avatar's refusal to join either Hoshido or Nohr enrages Xander so much that he becomes even more obsessed with hunting them down and murdering them for their "betrayal" than he was in Birthright, while Ryoma, though deeply disappointed in the Avatar's choice, is much more willing to hear them out.
First Princesses Hinoka and Camilla. Doubles as Tomboy and Girly Girl. Similar to her older brother above, Hinoka is a Hot-Blooded warrior who actively hunts you down in Conquest, and prefers to not follow guerilla tactics because it is against her code of honor, when Camilla hunts you down in Birthright because Garon told her so and is more compatible to pragmatic tactics.
First generation second princes Takumi and Leo. Both reveals their dislike to the Avatar when you choose to oppose them, but Leo is still very collected when Takumi throws you rampage just like Ryoma does. It can also be said that Takumi played this trope to himself, that his Birthright self is more aggressive towards the Avatar and Nohr in general, in Conquest even more so, but in Revelation he is much more forgiving, calm, and accepting. it has to do with him being possessed by Anankos in Birthright and Conquest and amplifying his hate and jealousy, when in Revelation, he is , well, himself, so he much more reasonable there. Even in Revelation, Takumi is still red to Leo's blue as he is still more emotionally vulnerable and still have excitable childish streak. However, Takumi is also blue to her older siblings Ryoma and Hinoka, also his retainers Hinata and Oboro.
Second princesses Elise and Sakura. Both are healers that loves everything in the world, however, Elise is extroverted and excitable Genki Girl when Sakura is a shy girl who can't even speak her words without stuttering.
Second generation crown princes Shiro and Siegbert. Shiro is Boisterous Bruiser, when Siegbert is soft-spoken individual.
Gauntlet: Savage Warrior Thor and noble Valkyrie Thyra fit their colors, although Gauntlet II has all heroes change different colors.
Genshin Impact features a few of these pairs, with some of them being actual oni:
The sworn brother duo of Kaeya and Diluc. Kaeya is the Red, being playful, flirty and laid-back, while Diluc is the Blue, being more stoic, serious and monotone. Ironically, their colour schemes and elements would suggest that it's the other way around.
Featured commonly together in fanon due to their similar height and childishness, we have the Friendly Zombie Qiqi and Person of Mass Destruction Klee. Qiqi speaks in a monotone, acts forgetful, and does not react much to her surroundings. Klee, on the other hand, loves bombing things. Colorcoded.
Beidou and Ningguang, in addition to being foils with each other in terms of attitude, also have this dynamic. Ningguang is imposing, elegant, and keeps many of Liyue' secrets. Beidou is headstrong, honest, and is always more than willing to share a drink with you.
Chongyun is, strangely, the Red Oni to his own Blue Oni. Usually, he is calm and collected around people...until his Yang energy takes over, where he goes into a manic mode and do things like dancing with his greatsword or chasing Xiangling, thinking she is possessed by a spirit.
Even stranger would be how Chongyun is usually the Blue Oni compared to his best friend Xingqiu (who likes pranking and teasing Chongyun), but the dynamic flips when Chongyun goes into his Yang state. (Well, partially because Xingqiu isn't very hotblooded in the first place). Their normal roles are colorcoded.
Itto is quite literally, the Red Oni from the Japanese folktale. In his story quest, we get introduced to his Blue Oni brother, the NPC Takuya. The story quest has an altered version of the original myth, but the characteristics of each Oni remain the same.
This dynamic is also present in the "children" of the Electro Archon, though it is unknown if they have ever actually met each other. Scaramouche (later playable as Wanderer) is the Red of the pair, deemed unsuited to serve as a vessel because of the development of strong emotions and free will. Even after his Heel–Face Turn, he is still a sharp-tongued Tsundere that does as he pleases. In contrast, the Raiden Shogun is the Blue, a "perfect" puppet with very little emotion and a strict, logical approach to carrying out her programming. Her mission to enforce "unchanging Eternity" leaves little room for flexibility or emotions.
Alhaitham is the Blue (cold, stoic, and analytical), to Kaveh's Red (histrionic, emotional, and temperamental).
Furina is the red to Neuvillette's blue during trials in the Opera Epiclese, where his calm and orderly presence contrasts against her performative behavior.
Ginga Force has the Hot-BloodedFiery Redhead Alex Heatburn as the red oni while his partner, Margaret Whitetail, is the polite, laid back, and easygoing Nice Girl as the blue oni.
The villains of the first Golden Sun have a Red Oni, Blue Oni vibe. Menardi, while more reserved, is Hot-Blooded and driven, plays the role of The Dragon, occassionally gets fooled by her partner's scheming, and dresses in red. Saturos, while more outgoing, is a crafty trickster and has a definite blue theme going in his design.
Golden Sun: Dark Dawn has the Kaocho generals, temperamental Ku-Embra in red armor and honorable Ku-Tsung in blue armor. And the warm, outgoing Sand Prince Gem, who openly invites you to befriend him/it in the Defeat Means Friendship sense, and the cold, arrogant, self-centered Ice Queen Gem, who balks at the idea of serving Adepts again.
Grand Theft Auto: Vice City brought us two hispanic tycoons, Ricardo Diaz & Juan Garcia Cortez. Diaz is the loud, treacherous, and arrogant red oni, while Cortez is the calm, informative, and wise blue oni.
Grand Theft Auto V brings us Trevor Philips and Michael de Santa. Trevor is the Ax-Crazy, violent, and reckless red oni, while Michael is the aloof, wise, and calculating blue oni. This is also referenced by their colors when swapping characters: Michael has blue while Trevor as orange. Franklin Clinton sits in between the two as the purple oni with a green color scheme.
Guilty Gear is another reversal of the scheme with The Stoic Sol Badguy's iconic red bandanna and The McCoy Ky Kiskie's blue lightning magic.
Gungrave: Overdose has Jyuji Kabane and Rocketbilly Redcadillac. One is a hot-tempered, undead blind warrior who constantly makes death threats against those who annoy him and who's fast in attacking his opponents without really thinking of a plan first (and he's Dual Wielding red gunblades); the other is a kind and somewhat naive rocker ghost with a heart of gold who loves the ladies (and his weapon is a blue electric guitar).
In Halo: Reach, Noble Team has Emile's red to Jorge's blue. This is most clearly seen when Noble rescues the researcher's daughter, Sara Sorvad, in the first level's ending cutscene: Emile is dismissive and makes digs toward Jorge, while Jorge removes his helmet, attempts to calm Sara by speaking in their native Hungarian, and shows sympathy for her father's death.
Heavy Rain has the playable characters with the partners they recruited:
Scott Shelby is a private detective with a calculating mind and precise planning while Lauren Winter is a woman with a hot temper and stubbornness to get involved in his investigation whether he likes it or not.
Ethan Mars and Madison Paige have each other as this. The former is a father searching for his own son and does whatever it takes to rescue him, even breaking the rules while the latter is a journalist that uses tactics to get to the answers she needed.
Hidden City has Security Service agents Kira Woodville and Rayden Storke. Kira is more outspoken, quicker to action, and is the better fighter between the two (she even serves as his bodyguard during their first mission together). Rayden, on the other hand, is more diplomatic, friendly and easy-going. Their uniforms' colours reflects their temperaments quite well.
The two playable characters, the Biker and Jacket are Red and Blue respectively. This is most notable with their differences in living conditions; the Biker's fiery attitude is reflected by the bright neon colors which decorate his Iconic Outfit and apartment, whereas Jacket lives in a dingy, poorly-maintained apartment which is decorated with lots of drab, faded browns and grays (again, just like his outfit), reflecting his unobservant and passive approach to life.
There are also the two masked figures that Jacket sees in his nightmares alongside Richard. Rasmus (the owl-masked mobster) is rebuking and angry towards Jacket, while Don Juan (the horse-masked woman) is soft and compassionate towards him. They are Red and Blue respectively.
The polite and serene Nepgear (blue oni) of Hyperdimension Neptunia mk2 has this relationship with her Tsundere best friend Uni (red oni) and her hyperactive sister Neptune (red oni). There's also the energetic and brash Ram (who dresses in pink) and her sister; the extroverted and calm Rom (Who dresses in blue).
Ikaruga's main gameplay mechanic makes use of positive (white/blue) and negative (red/black) energy shots.
The Fubuki brothers. Shirou Fubuki is the blue oni: a cool, calm, and rather timid defender. His brother, Atsuya Fubuki, is the red on: Hot-Blooded and forward, with red hair to boot.
The two co-captains of The Chaos, Burn (Nagumo Haruya) and Gazel (Suzuno Fuusuke). Burn is, as his name would suggest, a fiery red oni (also with red hair) to Gazel's blue oni, who's calm, confident, and An Ice Person.
Jak and Daxter: The oni colors between the eponymous protagonists is complicated, considering that they both have shards of red; personality wise, Jak is the blue to Daxter's red, but in combat, it's inverted.
In Jak II: Renegade, there is Onin (blue) and Pecker (red), Torn (blue) and Ashelin (red) and the two incarnations of Samos (old being red, young being blue). And then there is Erol, who's the red to Jak's blue.
In Jak 3: Wastelander, Damas is the blue to Kliever's red. And regarding the Big Bads, Veger is the blue to Cyber Errol's red.
Just Dance: From the Enter the Danceverses saga, we have the upbeat and energetic Brezziana of "Physical" with a very exhausting choreography (Red) and the calm and introverted Mihaly of "RatherBe" with a very technical choreography (Blue).
KoF's own Kyo Kusanagi and Iori Yagami are their series' Red and Blue. Kyo is cocky and high-spirited while Iori is cold and ruthless in battle. However, if Iori's Orochi blood flares up...
Hot-Blooded Ralf Jones (red oni) and The Stoic Clark Still (blue oni) from Ikari Warriors. Ralf beats enemies down with explosive punches and lots of yelling, while his partner Clark is much more inclined to break his opponents' bones with grappling moves without breaking a sweat (or saying much of a word).
Fatal Fury carryovers Terry and Andy Bogard fit as well, with Terry matching the red attributes (being outgoing and having a vibrant personality) and Andy picking up the blue (focused and disciplined).
2001 introduces K9999 as the Red Oni - the borderline psychotic 9999th clone of Kyo who hates being given orders and considers everyone beneath him. 2002: Unlimited Match introduces Nameless as his respective Blue Oni - the cold, emotionless 9999th clone of K' who defers to authority even to his own detriment.
Sora and his rival Riku respectively represent red and blue. Sora is cheerful and reckless, bordering on being an Idiot Hero. Riku is calm, thoughtful and perceptive.
Axel and Saix, complete with the hair colors to match. The former is a hot-headed and flashy fire user, while the latter behaves in a cold and efficient manner. This extends to their original personas, Lea and Isa: whereas a young Lea is impulsive and extroverted, hisf friend is much more organised, quiet and mature.
Saix and Xigbar also seem to have this, especially in relation to Roxas. Saix is cool, calm, and detached but was completely ruthless in Kingdom Hearts: 358/2 Dayswhere he fought Roxas over whether he could leave or not. Xigbar is more likely to bend the rules in order to get what he wants. He also seemed concerned about Roxas/Sora in both Kingdom Hearts: 358/2 Days and Kingdom Hearts II
Larxene and Marluxia from Kingdom Hearts: Chain of Memories Larxene's sadistic and unforgivable personality (Red) contrasts highly with Marluxia's serene and cunning nature (Blue).
Terra and Aqua as well. Terra is more impulsive, and is also emotional and extremely concerned for his friends (not to say Aqua isn't). Aqua is more calm when it comes to decisions. Their battle poses reflect this as well.
The contrasting themes between Kingdom Hearts (Red) and Final Fantasy (Blue) can also be seen this way. Kingdom Hearts is lighter, kid-friendly and optimistic in moral (considering Disney is also involved). Final Fantasy however is darker, maturer and (for the most part) grounded in realism, promoting strategy over button-mashing.
In general, Kirby and King Dedede play Red Oni to Meta Knight's Blue Oni. Their colors play this trope straight too — with the carefree Kirby being pink, the aggressive King Dedede wearing red, and then the calm and mysterious Meta Knight being blue.
There are several examples in Knights of the Old Republic. In the first game, Carth and Bastila: Carth is a soldier, more impulsive and quick to act, and impatient of bureaucracy; Bastila is a Jedi, more likely to counsel discretion and restraint, and much more confident in the wisdom of the Jedi Council. Among the villains, Malak and Revan (as expounded in the first game and further developed in the second): Malak is aggressive and violent, willing to destroy an entire planet to kill one person; when you fight him, he has the Force Jump feat, indicating that he is a Jedi Guardian, the more combat-oriented of the Jedi classes. Revan was a Chessmaster verging on (in the sequel, achieving) Magnificent Bastardy, turning the tide of the Mandalorian Wars through strategic brilliance. In the second game, Atton and Kreia fill these roles, with Atton reacting much more emotionally to any given situation and Kreia remaining cool and detached.
The Legend of Heroes: Trails in the Sky: Hotblooded, combative, outgoing, soft-hearted, athletic, sometime tactless (though rarely downright mean or without a good point), mildly ditsy (it comes and goes) Genki Girl protagonist Estelle is the Red Oni; her cool-headed, book smart, tactful, introverted, mildly sneaky and pragmatic yet not unfriendly or uncaring adopted brother Joshua is the Blue Oni. Their hair colors match this, as well, with Estelle having auburn hair and Joshua's hair being dark.
The Legend of Heroes: Trails of Cold Steel has Rean and Crow who both have the same primary elements yet polar opposing secondary elements with Rean having Fire and Crow having Water which is a a straight giveaway to their relationship. Who the red oni-blue oni is flip flops throughout the game however as Rean usually has to reel in Crow when they're together; but when Rean and Crow end up opposing one another, Rean ends up being the hot headed guy compared to Crow's cool headed approach.
Ganondorf, the resident Big Bad, is represented by the color red — the color of Din, Goddess of Power, whose portion of the Triforce he wields. The color of Nayru, Goddess of Wisdom, is blue and synonymous with her acolyte, the wise, kind, serene Princess Zelda. Link is associated with Faore, the green goddess of courage, sitting in the middle of the two.
The Legend of Zelda: A Link to the Past: Ganon (Red) was a bloodthirsty king of thieves, while Agahnim (Blue) gains the trust of the King before killing him and sacrificing the Maidens. It becomes funnier once the player learns that Agahnim is the alter ego of Ganon.
The two Oracle games themselves were packaged in red and blue boxes - Seasons, in the red box, is the more action-oriented game, and Ages, in the blue box, is the more cerebral of the two. Their signature girls who are named after the goddesses Din and Nayru respectively and are representative of this trope as well.
In The Legend of Zelda: Skyward Sword, The erratic, emotional, and occasionally violent Ghirahim (red) and your analytical, noncombatant guide Fi (blue).
The Legend of Zelda: Breath of the Wild has its incarnation of Link and Zelda playing this dynamic, but their roles essentially turned around between the flashbacks and the present day. In the past, Link was more reserved and stoic compared to the more energetic and emotional Zelda. In the present, however, Link has become considerably more dorky and provides more comic relief, while Zelda has become calmer and more confident in her abilities.
In Yakuza 0, Kazuma Kiryu is a hot-blooded and headstrong young yakuza, making him the red oni, while Goro Majima is much more refined and business-minded, making him the blue oni. Their roles are reversed in the rest of the series, though, as Kiryu became much more stoic and Majima became... much less so between the events of 0 and the first game.
Since his introduction in Yakuza: Like a Dragon, Ichiban Kasuga proves to be the red oni to just about everyone around him, being excitable, emotional, and one of the largest Large Hams to ham it up in the series. This contrasts him with the quiet and brainy Yu Nanba, the older and more weary Koichi Adachi, and others. He also shares this dynamic with Kiryu when he returns to serve as Deuteragonist in Like a Dragon: Infinite Wealth, his quiet and stoic nature making him a natural foil to Kasuga.
The first two alien squadmates, Urdnot Wrex and Garrus Vakarian, who default to red and blue armor respectively and are a semi-criminal mercenary and a cop. Their fighting styles are different, with Wrex favors going into the heart of the fight itself with his trusty shotgun while Garrus maintains his distance as he eliminates his targets with a sniper rifle. Played with however, in that Wrex, while violent and impulsive, is actually fairly stoic and difficult to anger even to the most stressful of situations, while Garrus is significantly more hot-tempered and easier to rile, especially to the face of injustice. Their roles become more reversed in Mass Effect 2, where Garrus leaves C-Sec to become a vigilante, doling out his own justice in the lawless Terminus systems. Wrex, meanwhile, retires from the front lines to lead his clan, becoming a capable chief who leads clan Urdnot to become one of the most powerful on Tuchanka.
The first two human squadmates, Ashley and Kaidan, also play more standard Red Oni/Blue Oni roles, albeit with less color-coding; in a dialogue option partway through the game, Commander Shepard says that when s/he wants an answer "from the head", s/he goes to Kaidan, and when s/he wants one "from the heart", s/he goes to Ashley. In terms of combat, Ashley goes full offensive with bullets, while Kaidan provides support with his tech and biotics. Eventually, Shepard (and, by extension, the player) is forced to choose between them.
Shepard can also join in on this trope thanks to the game's Karma Meter, though with some slight inversions. Blue-coded Paragon Shepard tends to be more empathic and personable (typically a red trait), while red-coded Renegade Shepard is more self-centered and/or mission-oriented (typically a blue trait). In Mass Effect 2, paragon and renegade decisions affect Shepard's appearance by way of a Hand Wave. A renegade character will end up horribly scarred and with glowing red eyes. A paragon character, meanwhile, eventually heals the scars and goes back to what they used to look like. Default Shepard has blue eyes. Renegade Default Shepard ends up with red eyes.
Miranda and Jack. The two don't get along and their temperaments couldn't be more different. Cool, collected Miranda, with her impressive intellect and all-business demeanor, is the Blue Oni, and hot-blooded, impulsive Jack, with her vengeance motif and passionate poetry, is the Red Oni.
Tali and Kasumi also qualify. Both are some of the best tech experts in the galaxy, but Tali is calm and sarcastic, while Kasumi's nature is much more energetic and cheerful. This also shows in their career roles. While Tali is content with performing research and maintanence, Kasumi uses her skills to become one of the best thieves in the galaxy.
Paragon Shepard and Samara also qualify, as both are members of elite organizations tasked with dispensing justice in the galaxy. Paragon Shepard's approach is to judge each case individually, offering a second chance and amnesty to those who repent for their crimes, whilst often granting Cruel Mercy to those who don't. Samara's approach however is to go in like a wrecking ball in her pursuit of justice, unless she can be convinced to do so otherwise or if a compromise is allowed by The Code.
Mega Man X has the Technical Pacifist, blue-armored X and the aggressive, red-armored Zero in the games. But it's inverted later on, as X grows more emotional and Zero gets calmer.
The aloof, blue ice-element Dark Action Girl Leviathan and red fire-element berserker Fefnir in the Mega Man Zero games.
The blue Emotionless Girl Pandora and berserk (even moreso than Fefnir) Prometheus in the Mega Man ZX series.
Inverted example: Vent/Aile, the Blue Mega Man, is a hotheaded and impulsive boy/girl who tends to charge headfirst to the situation and, thus, Red Oni. Girouette, the Red Mega Man, is his/her Big Brother Mentor who is calm, caring, and level-headed and, thus, the Blue Oni.
Inversion in Mega Man Battle Network. Lan and MegaMan are blue, Chaud and Protoman are red. Chaud's the AloofRival to Lan's Idiot Hero, and while Rock is a lot more savvy and collected than his Operator, Protoman's professionalism and businesslike manner still plays Blue Oni to his Power of Friendship philosophies.
Inversion in Mega Man Star Force: Geo Stelar, who wears red, is a Hikiko Mori who doesn't actually enjoy fighting and, thus, is the Blue Oni. The blue Omega-Xis, on the other hand, is a hothead who likes fighting and is very aggresive and, thus, is the Red Oni.
The Mega Man series inverted this from the get go with naive and impulsive Kid Hero Mega Man, who is the one in blue, and his more mature and experienced Aloof Big Brother Proto Man, who wears red. However, Mega Man, who is not a Technical Pacifist like X but still isn't all that into fighting, is the Blue Oni in comparison to his Blood KnightEvil Counterpart Bass (who wears black and gold, but still qualifies for obvious reasons).
In Metal Gear 2: Solid Snake, Solid Snake is eternally collected and detached, and wears a blue bandanna, while his Evil Counterpart Gray Fox is emotive, passionate and driven by feeling, and wears a red bandanna. (This holds in both the original Comic-Book Fantasy Casting version, and the version with revised designs.)
In Metal Gear Solid, Solid Snake and his Evil Twin Liquid Snake could represent this trope to a point. Whereas Solid Snake is usually calm, generally soft-spoken, and tries to compartmentalize his emotions, Liquid Snake is brash, arrogant, obnoxious, and overconfident.
Mugen Souls gives us the hyperactive Welsh and her sister, the introverted Sharuru. They reverse this, however, in that Welsh is more likely to listen to reason and questions needless fighting, while Sharuru is more stubborn and doesn't hesitate.
Inverted in the original Myst: Achenar is passionate, strong, uncontrollable to the point of insanity and an excellent hunter, while his little brother Sirrus is calm, sophisticated, manipulative, and a brilliant technician. Nonetheless, Achenar is trapped in the Blue Book when you meet him and Sirrus is trapped in the Red Book.
In Ninja Gaiden Sigma II, the Tengu Brothers fit this trop to a T. The red twin is hot-blooded and cheeky, while the blue twin is wiser and more cautious, telling his brother not to underestimate the enemy. When you fight them at the end of chapter 5, the red one will usualy come at you first, although their fighting style is identical.
No More Heroes 2: Desperate Struggle: You have New Destroyman, who was cut in half in the first game, and his two halves got two different personalities. And android halves. The Red one is in the background, calling Shinobu a whore and the like, while the Blue one at least offers to shake hands. It's worth noting that the former has a blue eye, while the other's is red. Also, Travis Touchdown has a red tiger, and a trailer indicates that his twin brother Henry was supposed to have a blue tiger.
Bunk Bed Junction from No Straight Roads share this partnership. Mayday is the orange-skinned Red Oni, impulsive and passionate. Zuke is the green-skinned Blue Oni, relaxed and analytical as he follows May's latest plan. Uniquely, the dynamic shifts when dealing with DK West; Zuke becomes the Red Oni, angry and aggressive with his older brother due to past grievances while Mayday becomes the Blue Oni that tries to calm him down and keep him from ruining his relationship with his brother.
Not for Broadcast': The two leaders of Advance, Peter and Julia, are Red and Blue respectively. Peter is a loud, brash, outspoken TV-host, where as Julia is a calm, collected, maternal lawyer.
Hiker and Rabbit Lady have this dynamic in Oh Jeez, Oh No, My Rabbits Are Gone!!!; Hiker is an outgoing adventurer, while Rabbit Lady is a quiet, thoughtful recluse.
Ōkami has a pair of enemies known as "Red Oni/Ogre" and "Blue Oni/Ogre". They attack with fire and ice, respectively.
Omega Strikers: Vyce is the energetic and loud red oni to Octavia’s calm and precocious blue oni. Bonus points for the two actually being oni.
In Onimusha 2: Samurai's Destiny, the always-drinking, eating, and lecherous Ekei can pass for a red oni (and dresses all in yellows and reds), while the serious, book loving, thoughtful Magoichi is a blue oni (complete with blue clothes).
Oni has fun with this. Konoko, real name Mai, is the blue Oni, while Muro, Mai's brother, is the red Oni. However, their personalities seem to be the opposite of their colours...at least early on. By the end, however, they pretty much exhibit the personalities you would expect from their colours. By the way, is it a coincidence that they both have purple hair, which is the colour you get from mixing red and blue together?
The first game features the Gofer Sisters, R.B. (Red) and L.B. (Blue). To further drive home this trope, they favor those colors on their dresses and matched fighters, Hugin and Munin.
Otomedius Excellent introduces the Robot Girls Arnvel (Blue) and Straf (Red). The opposition is further driven home by them being an Angel-And-Devil-themed pair.
Junkrat is the loud and crazy Red, and Roadhog is the calm and quiet Blue.
Chirpy and optimistic Tracer (Red), and cold, snarky Widowmaker (Blue).
Slick and groovy Lucio (Red), with the stoic, orderly Symmetra (Blue).
Friendly and eccentric Genji (Red), and his sour and calculating brother Hanzo (Blue).
Spunky, enthusiastic D.va (Red) , and gentle, angelic Mercy (Blue).
Pedestal: The main duo displays this in an ironic manner; the blue-haired, blue-dressed Aoi Ooe (who's first name even means blue in Japanese) is the plucky, passionate, headstrong Amateur Sleuth, while the redhead Akari Abe is the cool, collected, and apathetic sidekick.
Phantasy Star Online 2 has Newman twins Patty and Tea: Patty is perky and upbeat while Tea is more calm and reserved. The trope is also played with for the Dewman race, which all have oni-like horns and can be given red or blue skin.
Iconic legendary Pokemon, Mew and Mewtwo very clearly contrast one-another. Mew playfully avoids human contact, it's small, pink and cutesy with a perky demeanor (red). Mewtwo on the other hand, is serious, no-nonsense and undeniably formidable to catch. It is also deeply intuitive, preferring a life in solitude questioning the world (blue).
In Pokémon Crystal, HeartGold, and SoulSilver, Morty and Eusine. Morty is the calmer, more down-to-earth one (blue), while Eusine is the more hot-headed, selfish one (red). The two are friends. Ironically, Morty likes the more hot-headed Raikou and Entei (which attempt to run away when you encounter them), while Eusine prefers the calmer Suicune (which does not).
Maxie and Archie from Pokémon Ruby and Sapphire. Ironically, while exactly which is which tends to vary a bit depending on the medium, generally quiet and scheming Maxie (the leader of red-themed Team Magma) pulls Blue Oni duty while his wilder Team Aqua counterpart Archie plays the role of Red Oni. This is upped in the remakes, where Team Magma has a very scientific and orderly aesthetic, and Maxie sports a pair of spectacles and a thin body frame, while Team Aqua is pirate-themed, full of goofier members, and Archie has a design that really gets across the fact he's a Boisterous Bruiser. However, Maxie seems to have the worse temper of the two.
The two Cheering Pokémon Plusle and Minun both have the colour and stats to match this trope.
This is exemplified by Flint (hot headed, red afro sporting fire user) and Volkner (collected, blue wearing electric trainer), both are laid down as friends in the games while Platinum delves into the comparisons on a deeper level with humorous effect, where the two are battled together and also communicate with the player at certain points.
Arceus and Giratina. Arceus represents God and in Pokémon Conquest, one of the rare times in the games where you see it, it communicates telepathically with the player and is calm and cool. While Giratina is considered one of the most evil Pokémon there is, and is widely thought to represent The Devil.
Skyla and Elesa. Skyla is tanned, red-headed and the cheeky Flying Type Gym Leader, while Elesa is fair-skinned, Blonde (later Black) headed and the calmer Electric-type Gym Leader.
Basculin's abilities also reflect this tropenote Though not in Black and White 1 due to a bug., with the Red-Striped Basculin getting Reckless (boosted damage for recoil moves) and the Blue-Striped Basculin getting Rock Head (immune to recoil).
Sawk and Throh are more literal examples of this trope, in that they are both based on Oni. Character-wise, Sawk (blue) are karate-based fighters who train in solitude while Throh (red) are judo-based fighters who travel in groups of five. Gameplay-wise, Sawk is the Glass Cannon while Throh is the Mighty Glacier.
Reshiram and Zekrom themselves also fall under this trope. Reshiram represents unbiased truth, and Zekrom represents zealous ideal. Ironically, Reshiram is fire-type while Zekrom is electric-type.
Red Eyes and Blue Eyes, the Co-Dragons of the Pokémon Pinchers in Pokémon Ranger: Guardian Signs.
Many starter Pokémon, mainly the Fire-type and the Water-type.
Charmander family (red) and Squirtle family (blue) with the Bulbasaur family in the middle.
There is also Mega-Charizard X (black with blue flames) and Mega-Charizard Y (red). Inverted in terms of stats, as Charizard X is the physical fighter and Charizard Y the long-range fighter.
The Totodile family (red) and the token defense-oriented Chikorita family (blue) with the Cyndaquil family in the middle.
The Mudkip family (red) and the Treecko family (blue) with the Torchic family in the middle. This is more visible in the final stage of evolution.
Chimchar family (red) and Piplup family (blue) with the Turtwig family in the middle.
Tepig family (red) and Snivy family (blue) with the Oshawott family in the middle.
Chespin family (red) and Froakie family (blue) with the Fennekin family in the middle. This is more visible in the final stage of evolution, based on the classic RPG classes of Fighter, Thief/Ninja, and Mage respectively.
Inverted with water-typed but clownish Popplio (red) and fire-typed but stoic Litten (blue), with Rowlet in the middle. This is, however, switched around when they evolve; Litten's final form, Incineroar, is a furious heel wrestler (red) while Rowlet's final form, Decidueye, is a shrewd archer (blue). Popplio's final form Primarina is calm and dignified but not as cold as Decidueye, placing it in the middle.
In Super Smash Bros., the animalistic, wild, somewhat slow Charizard is the Red Oni to the nimble, swift Greninja's Blue. Later Incineroar replaces Charizard in that role.
In what is a bizarre twist for this trope, Lopunny plays this trope to itself. While it is normally shy and averse to combat (blue), Mega Evolution causes this to give way to the inner inferno (red).
Darmanitan also plays this trope to itself. In normal condition, it is a red colored, angry-looking mixture of Fragile Speedster and physical-attacking Glass Cannon. If its HP drops below half, it goes into Zen Mode, where it becomes a blue-colored emotionless special-attacking Mighty Glacier.
In Pokémon X and Y the blue Xerneas creates life while the red Yveltal embodies destruction.
Zygarde is blue as well, since it represents Order and in-charge of balancing the latter two.
Pokémon XD: Gale of Darkness has Mr. Verich's bodyguards Ardos (red) and Eldes (blue), despite their clothes and hair being the opposite colors.
Pokémon Sun and Moon has the practical joke artist Gladion as the Red Oni to the bookworm Lillie's Blue Oni.
Pokémon Legends: Arceus has the leaders of the Diamond & Pearl Clans, Adaman (red) & Irida (blue). The two don’t get along due to their tendency to see things in relation to their personalities, as well as how their clans view the deity they call “almighty Sinnoh”. Adaman hates seeing time go to waste, tends to rush headlong into situations without thinking, and can’t stand people who are unwilling to be as efficient as he is. Irida is more sensitive, values caution & foresight, and is shown in the story to be struggling with self doubt about her abilities as leader. Inverted by their clothing, however - Adaman wears dark blue & black while Irida wears red & white.
Blue Oni and main character Stocke is a stoic, rational, and always-collected spy with a lean build and very pretty looks. Red Oni Rosche is a soldier with a big booming officer's voice, is much more emotional, outgoing, and passionate (qualities that Stocke argues makes him a much better leader) and has a a very brawny build.
Red Oni Raynie is hotblooded, outgoing, and somewhat slow on the uptake. Blue Oni Marco is a little more rational and somewhat sharper and more tactful than his counterpart. The sidequests (Raynie the Active and Marco the Calm) for unlocking some of their abilities are a play on this dynamic.
In the game's backstory, Prince Ernst and Princess Eruca. Ernst was a rebellious Warrior Prince who went out of his way to oppose their father's policies, while Eruca was much more quiet and reserved and less openly defiant. Since Ernst's death, Eruca has continued his work, but she's kept the same personality. Unlike the other two sets, they follow both the color-coding and Elemental Powers to the letter.
Creepy ChildSpirit Advisors Teo and Lippti are a mild case. Both are relatively calm and dispassionate, but Teo is more harsh, cynical, and blunt, while Lippti is kinder and more patient. They also wear reddish-orange and bluish-purple, respectively.
Red Dead Redemption II: Micah Bell and Arthur Morgan. While Micah (red) is wild, violent, unpredictable, sadistic and homicidal, Arthur (blue) is a Byronic Hero who tries to be rational, cordial, polite, empathetic and compassionate, especially after he is diagnosed with turberculosis. This trope is even represented on both men's shirts: while Micah's shirt is red, Arthur's shirt is blue.
Resident Evil 0: Birkin and Wesker were this during the time they worked together; the former is nervous and panick-y while the latter is calm and calculating. When they injected their own virus into themselves, Birkin is out of control and rampaging, while Wesker has control of it and isn't rampaging.
As of Resident Evil 6, main characters Chris and Leon, now meeting for the first time, take these roles: Chris is the blue, in that, while still reeling emotionally from a botched mission, tries to remain practical and mission-oriented, while Leon is the red; while outwardly stoic, he's far more emotional in his pursuits (something that stuck with him since Resident Evil 2), which is shown during when the president of the U.S gets zombified and when Ada, who he has feelings for, gets pinned with the blame for a bio-terrorist attack.
Joseph Sheridan and von Richter in the WW2RTS game RUSE- while the US officer Sheridan, a Yale-dropout, is described as impetuous and willing to push the enemy to their limits, whatever the cost may be, German General von Richter is described as a chess-player, who prefers calculated approaches with maximal gain and minimal losses. The real Blue Oni at Sheridan's side is The Lancer, Colonel Andrew Campbell, Senior British Intelligence Officer. He is calm, collected, and introduces Joe to all the ruses, and practically is his tutor throughout the war (as he also is older and more experienced than Sheridan). He evens keeps Sheridan from addling away once being promoted to General, like his predecessor did before him.
Kazuki and Sogetsu. Both are ninja, but the former dresses in red, is hot-tempered, and has fire-based powers; the latter dresses in blue, is far more composed, and has water powers.
There is also the sisters Nakoruru and Rimururu. Nakoruru dresses in red and is the Blue who is calm, pure, fresh and poetic. In reverse, Rimururu dresses in blue and is the Red who is vivacious, cheerful but sometimes a little bit rude.
Sengoku Basara has two main examples of this. There's poster boys Sanada Yukimura as the loud, Hot-Bloodedfire-user and cool, lightning-wielder Date Masamune. Masamune is pretty Hot-Blooded himself, but still serves as the Blue Oni in comparison to Yukimura. Or both of the poster boys can be considered as Red Onis to their respective closest vassals (Sasuke for Yukimura and Kojuro for Masamune) . There's also Takeda Shingen, Yukimura's equally Hot-Blooded commander and icyswordsman Uesugi Kenshin.
This is pretty much a major attribute of Order Versus Chaos or Law vs. Chaos as presented in game. Law follows the premise of stoicism, peace, utilitarianism and living for the greater good, with its darker interpretations allowing for the end of individuality and emotions as humanity enters a World of Silence under God. Chaos on the other hand is usually lead by the charismatic Lucifer, who follows the ideology that one should only live for themselves and let their emotions and passions run wild, even at the expense of charity and creating The Social Darwinist world where might makes right.
In general, the Law Hero will be stoic and calm, while the Chaos hero will be brash and combative. the original duo, Walter and Jonathan and Zelenin and Jiminez all fit this characterization, the last two literally being associated with the colors blue and red.
Devil Survivor actually has its chaos Hero Naoya act like a Defrosting Ice King, especially on Amane's route on the 8th day of the OverclockedUpdated Re-release, and has an interest in more intellectual pursuits. Law figure Amane however is very clearly the Blue Oni compared to him, being a borderline emotionless Rei Ayanami Expy with bluish-purple hair.
Soul Hackers features a demon girl named Nemissa who does a Demonic Possession of the hero's friend Hitomi. Luckily, Hitomi is still able to bring out her personality and communicate, treating Nemissa like an annoying neighbour before they get along. Regardless, Nemissa is a lot more abrassive compared to the more sweet and calm Hitomi, much to the latter's dismay as people start to notice Hitomi acting strangely. Nemissa ironically has icy blue hair however.
The game features childhood friends and rivals Akihiko (red) and Shinjiro (blue). Akihiko is a cocky, impassioned fighter who loves the thrill of battle; in stark contrast, Shinjiro is brooding, secretive, and quiet.
The portable remake managed to pull off a fairly rare Distaff Counterpart version of this by introducing the option to have a female protagonist; the male protagonist is typically a bit reserved and intellectual and is accordingly given blue hair and eyes (and a blue in-game interface); the new female option is quite a bit more outgoing and cheerful and is naturally themed red with her hair and eyes.
Best friends Chie (hot-blooded Red) and Yukiko (calm and polite Blue). However, their powers are inverted, as Chie (Red) uses ice magic and Yukiko (Blue) uses fire magic.
There's also Yosuke (impetuous Red, with a tendency to put his foot in his mouth) and the Protagonist (calm and stoic Blue, and not particularly chatty). Indeed, there's an important moment in the game where keeping a cool head and stopping Yosuke from doing something rash is required to unlock the good ending.
The Hero can be quite theatrical in his Phantom Thief antics as Joker, but he's a lot more reserved and stoic compared to Ryuji, who cracks a lot of jokes, has atheletic dreams, and fostered a delinquent image. As for the other two male leads, Yusuke is a little emotional when it comes to art, but he carries an air of tranqil civility about the whole thing. The talking cat Morgana on the other hand likes to crack quips and is vocal about his feelings.
As for the girls, Ann is a passionate model whose fiery personality matches her powers, while Makoto is a more Defrosting Ice Queen model student, awkawrd at some social events. Futaba might be an isolated hacker, but she's quite emotional and loud compared to the sweet and reserved Haru.
The Updated Re-releaseRoyal gives us a clearer picture of Kasumi and Akechi. Kasumi, fitting her bright red hair, is a chirpy gymnist but is actually her sister Sumire, who was rather depressed and let herself get brainwashed into thinking she was Kasumi, rather than live with the knowledge that the real Kasumi was dead. Akechi meanwhile styles himself as a collected fine young man of justice but actually has a lot of Blood Knight tendencies, and in when this aspect is revealed, he cackles a lot in various emotional outbursts.
In Silhouette Mirage, nearly all lifeforms are divided into two categories: the Silhouettes, who represent force, emotion, and determination, and the Mirages, who represent intelligence, technology, and cold logic. Oddly, the typical color scheme is reversed: Silhouettes are blue while Mirages are red.
Sly Cooper is mostly in the middle between the blue Bentley and the red Murray. Though Sly himself happens to be the blue to Carmelita Fox's red. In the second game, Carmelita is mostly hot-blooded and quick to take action, while Neyla is calm and willing to help Sly out prior to her Face–Heel Turn.
This is reversed with our titular blue hero, who is a lot more outgoing and carefree than his red-clad counterpart, Shadow.
Then there are Sonic and Knuckles, a rather curious example. Originally, the fun and outgoing Sonic was the Red Oni to the serious and stoic Knuckles's Blue Oni, just like with Sonic and Shadow. After Shadow's introduction, however, Knuckles's character was altered, his calm and collected personality getting replaced with a more Hot-Blooded and boisterous nature, to the point he became the Red Oni to Sonic's Blue Oni, possibly to distinguish him from Shadow and avoid redundancy (as both Knuckles and Shadow are Sonic's rivals).
Played straight with Sonic (cool and collected) and Dr. Eggman (Large Ham).
There's also Knuckles (Red) to Rouge (Blue).
In Sonic Adventure, this is inverted with Chaos, who is blue, but falls under the Red Oni category, and Tikal, who is red-orange, but falls under the Blue Oni category. Another example is Tikal's father Pachamac and the rest of the ancient echidnas (Red) in comparison to Tikal (Blue).
The girls also follow this trope as Amy is the Red Oni, wearing a red dress and being much more energetic in comparison to Rouge, being the Blue Oni in dark clothes who is much more calm and collected.
In Knuckles Chaotix, the Chaotix also follow this trope with Vector, Charmy, and Bomb being red in comparison to Espio, Mighty, and Heavy being blue.
In Sonic Riders, the Babylon Rogues also follow this to a degree with Jet being red in contrast to Wave being blue and Storm being in the middle. Also, Tails (Red) to Wave (Blue).
In Sonic Chronicles, Knuckles would be the Red Oni to Shade's Blue Oni.
Sonic Rush plays it differently - Sonic meets Blaze, from another dimension. Sonic is blue, but more outgoing. Blaze is much more reserved and angsty, while being red and having fire powers. Towards the end of the game, when they get riled up about who will fight Eggman (mostly due to Blaze's distance and distrust of others for most of Rush), it is Sonic who remains calm, like his blue colour, while Blaze gets really angry and agitated, being the red. The two Eggmen in these two games also do this - the normal one, wearing red, is exciteable, whereas the Nega version in his cool black/dark green colours is a very calculative monster.
Eggman and Eggman Nega are also interesting in that they show the respective onis' stereotypical reactions to being pushed over the edge. Eggman may be wrathful, but he rarely tries to outright kill his opponents, especially in the gaming and Sonic X continuities, and never attempts to destroy the Earth, as his ultimate goal is empire. He's also Affably Evil, showing respect towards his nemesis Sonic and fondly remembering his late grandfather. Eggman Nega, while calm on the surface, is implied to have an extremely tortured interior, thanks to the ridicule that people have heaped upon his family. Although Eggman Nega's goal is nominally domination, he will very easily switch to the complete destruction of the world, most often at the first signs of complications in his plans, as Sonic Rush Adventure demonstrates.
In Splatoon, the Squid Sisters and Off the Hook cast Callie and Pearl as both Red (being more lively and excitable who are often first to speak) and Marie and Marina as both Blue (usually answering back and wearing more subdued expressions).
Frye and Shiver of Deep Cut from Splatoon 3 more-or-less fit the bill. Frye is an excitable Genki Girl with a yellow theme and Indian dance style. Shiver however is a Yamato Nadeshiko with a blue theme and Japanese enka style. Ironically despite their clear differences, the two have their goofy moments.
Grendor, the Big Bad of Spyro: Season of Ice, is a one-bodied, two-headed example. Whereas his green half is in a prolonged state of melancholy and is more passive in his mannerisms, the red side of him is always angry and is prone to be more aggressive and proactive whenever he communicates with anyone else.
Ryu and Ken. Ryu is philosophical, traditional, and prefers using the fireball from a distance, while Ken is brash, cocky, and innovative, and his favorite move is the uppercut, best performed at close range.
Sakura Kasugano (blue) and Karin Kanzuki (red) from Street Fighter Alpha Three. Despite their color schemes, the roles they play tend to vary with the media. In the Udon comics, Karin is extremely competitive and violent, making Sakura (relatively, as she is still rather hotheaded) blue. In Namco X Capcom, on the other hand, Sakura is impulsive and tends to rush into things without thinking, while Karin is much more calm, level-headed, and cynical.
In Street Fighter V, this is inverted as Karin (blue) saw newfound character development as she Took a Level in Kindness while Sakura's (red) personality remains the same.
An inversion in brothers Yun (red oni dressed in blue) and Yang (blue oni dressed in red).
Another inversion is Guy (who wears a crimson gi) and Cody (blue stripes/jeans). Despite his cynical and laid-back persona, Cody is the more cocky and reckless of the two and gets in fights to alleviate his boredom. Guy, on the other hand, is taciturn, stoic, and reserved and only fights when necessary.
And in a more literal example of red and blue oni, Ryu and Akuma's super-powered evil sides Evil Ryu and... Oni, have a red and blue aura respectively.
For the female fighters, we have Poison, Juri, Makoto, Ibuki and Elena (red). Chun Li, Crimson Viper, Cammy, Rose, Sakura and Decapre (blue).
Ryu and Ken: Ryu (blue oni) is stoic and studious while Ken (red oni)is brash and cocky.
Chun Li and Cammy: Chun Li (red oni) is outgoing, humorous, and cheerful, while Cammy (blue oni) is calm, collected, and focused.
Guile and Abel: Guile (blue oni) is persistent, disciplined, and stoic, while Abel (red oni) is childish, naive, and amnesiac.
Sagat and Dhalsim: Sagat (red oni) is prideful, arrogant, and considers himself an emperor, while Dhalsim (blue oni) is peaceful, ascetic, and humble.
Rufus and Zangief: Rufus (red oni) is loud, boastful, and jumps to conclusions, while Zangief (blue oni) is patriotic, a children's role model, and smarter than Rufus.
Poison and Hugo: Poison (red oni) is flirtatious, temperamental, and complains a lot, while Hugo (blue oni) is quiet, calm, and lets his fists do the talking.
Vega and Balrog: Vega (blue oni) is calm and sadistic while Balrog (red oni) is flippant, greedy, and brutish.
Rolento and Ibuki: Rolento (blue oni) is disciplined, serious, and military-minded, while Ibuki (red oni) is flirtatious, playful, and air-headed.
Guy and Cody: Guy (red oni) is disciplined and serious, while Cody (blue oni) is laid-back and nonchalant. Inverted in their fighting temperaments, with Guy stoic and minimalist, and Cody violent and thuggish.
Dudley and Elena: Dudley (blue oni) is calm, quiet, and courteous, while Elena (red oni) is playful and outgoing.
M. Bison and Juri: Bison (blue oni) is calm, calculating, and strategic, while Juri (red oni) is violent, sadistic, and sultry.
Kazuya and Nina: Kazuya (red oni) is maniacal, vengeful, and power-hungry, while Nina (blue oni) is cold, stoic, and focused.
Asuka and Lili: Asuka (red oni) is hot-tempered, vigilant, and cocky, while Lili (blue oni) is relaxed, easy-going, and elegant.
Hwoarang and Steve: Hwoarang (red oni) is arrogant, cocky, and hot-blooded, while Steve (blue oni) is cool-headed, relaxed, and calm.
King and Marduk: King (blue oni) is silent, stoic, and religious, while Marduk is hyper-aggressive and violent.
Yoshimitsu and Raven: Yoshimitsu (red oni) is giddy, youthful, and deceptively clumsy, while Raven (blue oni) is stoic, professional, and iron-hearted.
Lars and Alisa: Lars (red oni) is disciplined and serious, while Alisa (blue oni) is demure and polite.
Jin and Xiaoyu: Jin (blue oni) is calm, stoic, and focused while Xiaoyu (red oni) is youthful, playful, and energetic.
Akuma and Ogre: Akuma (red oni)is violent, intensely vicious and reckless while Ogre (blue oni) is patient, relaxed and methodical.
The original Stronghold game played this for drama in the form of the two advisors. Lord Woolsack, the blue oni in this case, continually tries to reason that forces belonging to the player would not be strong enough to defeat the Four Tyrants and that they must take time to make them stronger, but his opinions are hastily brushed aside consistently by Sir Longarm, the red oni. The player eventually sides with Sir Longarm, while poor Lord Woolsack is sent off from command and is ultimately captured, tortured and killed by Duc Truffe, who doesn’t seem to mind about what he just did based upon his report to Duc Volpe afterwards.
Suikoden II has lovable henchmen Seed and Culgan who wear red and blue respectively and pretty much embody the concept. There's also the main characters of the game, Riou and Jowy. Likewise, Camus and Miklotov, though the colors are reversed: Camus, who wears red, is the Blue Oni, while Miklotov, who wears blue, is the Red one.
Originally, the Bros. were little more than a Palette Swap of each other until Divergent Character Evolution split them apart. Mario, being the titular hero, wears red and is the all-around happy-go-lucky, kick-assy, everyone (except Bowser)-lovesy guy. Whereas the green-clad Luigi became portrayed as a Cowardly Lion, who is rather Timid and somewhat Silly, but still Heroic. Appropriately enough, in Mario & Luigi: Superstar Saga, after visiting two temples, Mario gets the power of (red) fire and Luigi gets the power of (blue) thunder.
The Red and Blue Goombas that King Goomba sends to stop Mario from reaching Toad Town in Paper Mario.
Inverted with the Red Koopas and the Green Koopas. While green koopas will happily march off cliffs to their demise, red koopas will turn around out of fear. The same can be said with Green Koopas and their almost immortal Dry Bones counterpart.
Played straight with the princesses as well: There are Peach wearing pink (Purple Oni), Daisy wearing orange (Red Oni) and Rosalina wearing blue (Blue Oni).
The first and second Mario’s love interests, respectively, Pauline and Peach. While they are both rather calm and feminine, Pauline is a rather outgoing singer and the busy mayor of New Donk City (Red Oni), while Peach is a wise and cheerful Princess Classic (Blue Oni).
The Koopalings have Iggy, Lemmy and Morton as the Red and Larry, Ludwig and Roy as the Blue. Wendy and Bowser Jr. are between the two.
Mario and Luigi's two evil counterparts, Wario and Waluigi. Although they can both be short-tempered, Wario acts more out of impulsivity and by strength (Red Oni)while Waluigi is more wise and thoughtful (Blue Oni).
Mario can do this with Luigi, Mega Man, or Sonic, being the Red for the former two (visible with his red cap and Luigi's green cap and Mega Man's blue suit, the latter who is practically emotionless in this game). However, Mario and Sonic are an extremely famous rivalry, representative of Red vs. Blue, but ironically, Mario corresponds more to the Blue and Sonic to the Red (though it's possible to say that Mario wears blue overalls and Sonic wears red shoes). He can also do this with Dr. Mario, who comes from a puzzle game.
Humble, heroic and serious Link as the Blue to the naive, more energetic, faster Toon Link's Red.
Kirby and King Dedede, being respectively pink and red-wearing, these two being gluttonous and playful being Red to contrast with Meta Knight, with his dark blue cape and his serious and stand-offish nature being Blue.
Fox the confident leader with brown fur as the Red, and Falco the proud acolyte with blue feathering as the Blue. Fox can also do this with his rival Wolf, who is his stand-offish and dark counterpart.
Many cute and cheerful Pokémon like Pikachu, Jigglypuff, Pichu or Squirtle and powerful and brutal Pokémon like Charizard can be classified as Red to calm and tactical Pokémon like Mewtwo, Lucario and Greninja as Blue (Charizard and Greninja in particular). Where Ivysaur belongs is ambiguous, however.
Captain Falcon does this with himself, with his calm, stand-offish, Batman-like self in F-Zero being Blue, and his Hot-Blooded, combative self in Super Smash Bros., resembling a Super Sentai hero, being Red.
Ness is courageous and trusting (Red, with a red baseball cap to boot), while Lucas is timid and shy (Blue). However, this could qualify as an inversion, as Ness wears a blue-striped shirt while Lucas wears a red-striped one.
Zelda can do this with her second identity Sheik, with Zelda's slow but powerful mystical fighting art to Sheik's more fast and direct ninja-like combat style. Her personality is still the same, however.
Pit and Dark Pit bring with them their Goku-and-Vegeta-like dynamic from Kid Icarus Uprising, with the hot-blooded Keet Pit and the snarky, aloof Dark Pit, respectively White and Black; though do note, Pit is the one with blue eyes, Dark Pit is the one with red eyes.
Inverted with Olimar and Alph, as Olimar has red gloves but is more calm- and leader-like, as opposed to the blue-suited Alph's young padawan personality. Also, Red Pikmin are more offensive to Blue Pikmin are more defensive.
Male Robin is more calm and relaxed than Female Robin, who is here portrayed as more sassy and spirited; even in their home game the male is often calmer than the more troll-like female. Coincidentally, F!Robin tends to have warm colors as her palette swaps, while M!Robin wears cool colors. Inverted with Chrom, who appears in their final smashes; despite wearing blue he is The McCoy to Robin's Kirk and Lucina's Spock in Awakening, and in Smash is noticeably loud and passionate in his battle cries. The effect can be increased with F!Robin's red alternate costume.
Tag team partners Greninja and Incineroar fit the bill. Incineroar is the red fire-type who is big, hammy, showboaty, and is all about flashy damage whereas Greninja is the blue water-type who is more on swift, cunning moves.
For the third-party characters in Brawl, Sonic's energetic yet laid-back personality as the Red contrasts with the calm and serious Snake. Sonic and Pac-Man can be considered red to Mega Man and Ryu's blue in the fourth game, with Sonic ironically being associated with blue and Ryu with red.
Master Hand and Crazy Hand, even indicated in their names. Master Hand, god of creation, being the more controlled and calm one, is Blue, while Crazy Hand, the god of destruction, is Red, with it's erratic, twitchy movements. As the final boss in the Wii U version, their standby positions in Final Destination show this inverted with the lighting of the stage.
The Super Robot Wars series has the awesomeness that is the hotblooded Sanger Zonbolt and his Heterosexual Life Partner and intellectual foil Elzam Braunstein. Each of them is a total badass in a different way, one spouting absurdly cheesy lines but making them pure gold while the other serves as an Aloof Big Brother whose theme song trumps all others? Although, like some incarnations, the Red Oni Sanger's mechs will more than likely have a dominant color of blue, while Blue Oni Elzam always paints his mechs red.
Axel and Lamia as well, though the Original Generation series no longer portrays them as rivals. Axel is a hotblooded redhead who always fights on the front lines and pilots a martial arts Motion-Capture Mecha. Lamia is a cold and logical Ridiculously Human Robot whose mecha uses illusions and attacks from afar with a bow. Their personalities differ somewhat depending on which one's playing hero and which is playing villain, but they retain their red and blue traits no matter what.
In Original Generation, Axel becomes The Rival to Kyouske, which also has elements of this trope (at least, after the Retcon). Here, it's Axel who's the blue oni, as he's a Noble Demon antagonist turned Anti-Hero, and kind of Loner. Kyosuke serves as the Red oni, despite his Stoicism, as he's generally portrayed as very heroic and a natural leader.
Third Super Robot Wars Z: Jigoku-Hen: Gadlight is the red oni because of his impulsive, slovenly attitude. While he gets frequently reprimanded by Annarotta, Gadlight doesn't intend to retaliate. Annarotta is the blue oni due to her composure and skill in combat.
Super Robot Wars 30 has Edge and Az Sainklaus. Edge is the more Hot-Blooded of the two while Az is the more laidback one.
Lloyd and Genis: Lloyd is athletic, aggressive, puts all his focus into physical combat, and dresses in all-red. Genis is much more studious, much more willing to play by the rules, much calmer, puts all his focus into magical combat, and dresses in all-blue.
Lloyd {Red} and Kratos {Blue}. Kind of strange, since they're father and son.
Inverted by Celsius and Efreet, the summon spirits of ice and fire. Celsius is blue, but is arrogant and gives off a Hot-Blooded air. Efreet is red, but is calm and somewhat humble.
Tales of the Abyss: the main character, Luke, sports firey red waist-length hair and is extremely emotional and aggressive. The party's scholar, Jade, is calm, cool, collected, and sports an incredibly sharp wit. He is clad almost totally in blue. This trope modifies once Akzeriuth happens, with Luke no longer contrasting nearly as much with Jade as a red oni and instead contrasting much more with Asch as a blue to Asch's red. This is most apparent leading up to their final fight; Asch is yelling and screaming at Luke in rage, while Luke calmly but firmly disagrees with Asch's opinion that Luke should be the one to go on. Luke only loses his cool (and only slightly at that) just before the fight starts; contrast Asch, who shrieks the memetic 'replicaaaaaaaaaaaa!' line at Luke before attacking him.
Tales of Vesperia: Flynn is Blue and Yuri is Red (though they use different colors for the contrast: black and white). Flynn is much more calm, rule-abiding, and all around more mellow than Yuri. Though Yuri also understands the implications of his actions more than an average Red Oni, he's much more driven by his passion and obsession of taking justice than Flynn. Even to the point of resorting to vigilantism for a lot of the game to try and set things right. Whereas Flynn is more concerned with setting the laws themselves right and then respecting the rule of law. Ultimately, they share the same exact sort of goal (but different means of accomplishing it), as well as sharing somewhat similar sword skills (though the "identical" artes like Dragon Swarm are still performed quite differently).
Tales of Graces: It's difficult to find someone Asbelisn't a blue oni to, since Asbel is much more disciplined than most of his passionate party. Malik may be the only exception, and even that's brought into question during his fight with Asbel, where's he's far more passionate and flies off the handle berating Asbel if he loses.
Team Fortress 2 has a few among the mercs, fittingly enough given the Red vs Blu(e) premise.
Engineer and Pyro, who have an Odd Friendship, have this dynamic. Engineer is the Blue Oni and is calm, collected, soft-spoken, and prefers to let his machines do his work for him. Pyro is the Red Oni and is childlike, excitable, violently insane, and attacks directly on the front lines.
Scout and Spy (who is Scout’s father) also fit into this dynamic. Spy is the Blue Oni and is (on the surface) cold, professional, sophisticated, and ill suited for direct combat, instead relying on stealth and trickery. Scout is the Red Oni and is brash, hot blooded, rather crude, and relies on getting in an enemy’s face and unloading his scattergun into them.
Completely averted with the RED Demoman and BLU Soldier, who are both Red Oni, and Redmund and Blutarch Mann, who have the exact same (idiotic) personality.
Among the main healers and Smart Guys of the Team, Medic and Engineer fit the bill. Medic and his mediguns are single target but also can provide overheal to tank more damage while Medic himself can move freely and keep himself close to the battlefield, making him great in defensive teams to break sieges and in offensive teams Ubercharge makes him great at breaking through stalemates and highly contested areas to make pushes, making him the Red Oni. Engineer meanwhile uses the dispenser, which can replenish multiple allies in a respectable area at the same time as well as protecting it with a sentry gun at the cost of being static buildings that require the Engie to move around slowly as such in defensive plays Engineer is great for area denial and protecting objectives while offensive teams use it to hold the line and keeping the pressure with superior logistics with the teleporter making him the Blue Oni. They also fit the bill in terms of personality as Engineer is laid-back and gentle whereas Medic is a crazed goofball.
Hee'la and Des Serret. Hee'la is a brash and impulsive warrior who longs for an honorable death, while Des Serret is very cautious and balks at the idea that there is any honor in battle.
The brother-sister team Gavrielle and Farasat also count. Gavrielle is a cheery, carefree Pungeon Master, while Farasat is very grumpy and serious, and often tries to keep Gavrielle focused on their mission.
In the third Tenchu game, the evil wizard Tenrai employs both blue and red demons as foot soldiers. They're not given much personality, but if you're spotted and get drawn into a fight, the red ones will simply keep fighting until killed, while the blue ones will try an explosive kamikaze attack once their health is low.
The major red/blue example is between Jin Kazama (a stoic and soft-spoken blue) and Hwoarang (fiery with a touch of arrogance, making him red).
Jin can also be paired with his father Kazuya. Stoic, serious, and disciplined Jin makes the Blue to the brash and snarky Kazuya's Red. Another Red/Blue pairing is Jin/Xiaoyu, with Jin obviously being Blue to the energetic and cheerful Xiaoyu's red.
There's also the Williams sisters, Anna and Nina - they even have default red and blue outfits respectively.
And then there's rivals Asuka Kazama and Lili Rochefort. Asuka is the red oni, hot-blooded and quick-tempered, while Lili is the blue oni, being calm, refined, prim and proper.
Asuka can also be paired with fellow female Kazama, Jun. Tomboyish, loud, and hot-blooded Asuka makes the Red to the soft and calm Jun's Blue.
Wild Dog and Wild Fang from the Time Crisis series are a sinister version of this. Wild Fang is younger, impulsive, and brash; while the older Wild Dog is more cunning and cool-headed. They even dress the part in Time Crisis 3, with Fang wearing a red shirt with a flashy silver-patterned tie while Dog sports a blue shirt and a subdued red tie.
Treasure Hunter G actually has two brothers named Red and Blue as the protagonists. In a subversion, Red is both the Hot-Blooded hero and the stern big brother. Blue is portrayed as weaker but noble at heart.
Not directly used, but possibly referenced in Perfect Cherry Blossom of the Touhou Project series: In the Extra StageMid-Boss battle against Chen, one of Chen's spell cards is named Oni Sign "Blue Oni Red Oni". Half the bullets rush directly at you, while the other half drift around slowly in a somewhat random direction, though there are both red and blue bullets of both types.
For a more direct representation of the trope, Mountain of Faith's goddesses Kanako and Suwako fit the bill.
For an even more direct representation of the trope, there's Yuki and Mai, the stage 4 bosses of Mystic Square, one of the old generation games. Yuki is the Red Oni: she's upfront with the protagonist and she uses fire magic (usually blanketing the whole field). If Mai is defeated first, Yuki will be in a state of righteous indignation when she gets serious. Mai is the Blue Oni: She barely says a word before the battle and she uses cold magic (usually aimed straight at the player). If Yuki is defeated first, Mai will declare that Yuki was dragging her down and now she doesn't have to hold back.
This trope's also used in Embodiment of Scarlet Devil with the Scarlet sisters: Remilia, the more calm and collected one with blue hair, and Flandre, the more playful and Ax-Crazy one dressed in red. Though Remilia is still the Scarlet Devil from her feeding habits.
Ironically, both of the actual oni characters seen in games so far have been pretty strongly red. Up until Kasen was introduced, who is calm, scholarly, and strongly denies that she's an oni despite being all but stated to be one.
And finally, there's the main protagonists Reimu (a blue despite her red and white outfit) and Marisa (very red and assertive and loves blasting her opponents).
The core characters in 20XX actually wear their appropriate colours: Nina, clad in blue, is a long-ranged combatant whose name on her door is printed, while Ace, clad in red, is a quick, aggressive melee fighter whose door has his name crudely scrawled on it above a hand-carved tally of bosses.
The most explicit with this dynamic are Papyrus (Red) and Sans (Blue): while Papyrus is overconfident and enthusiastic, wears a red cape and dreams of being a royal guard, Sans dresses in blue, is more likely to spend time chuckling at his brother's antics from the corner and has a serious and philosophical side that he displays at times.
Two areas later, you can assist a similar dynamic between the show host robot Mettaton (Red) and his creator Alphys (Blue): while Mettaton is an overly dramatic character who focuses on entertaining, moves across multiple areas for different shows and hides his true colors until he's entirely sure nobody will interfere, Alphys stays behind her computer lab most of the time, has trouble holding a simple conversation and lacks confidence in herself because of her past failures as the royal scientist.
Another dynamic can be found between Flowey (Red) and the Human Child (Blue): both of them have a strong determination which allows them to rewind time to their last save (but the human's is stronger, leaving the flower as a simple spectator) if they died or want to repair something. However, while the Human Child is a quiet character who makes strong efforts to hide their powers to everybody, Flowey is a sassy flower who will taunt them with his memories of the events.
Amusingly, this also applies to the merch. The physical copies of the cover album "Determination" have two disks, a red one with metal covers of boss battle themes, and a blue one with electronic and ambient covers of area themes and emotional moments.
Given a slight twist in Utawarerumono. The "blue oni", who is the protagonist in "oni" form, is literally blue, though the "red oni" is actually mostly black. Also, the two turn out to be two halves of a god, which merge before going into hibernation at the end. There's also Hien and Hauenkua standing side by side as they betray their lord Kuuya, calm and collected Hien in a blue mecha, while borderline insane due to bloodlust Hauenkua sits in a red mecha.
Valkyrie Profile: Covenant of the Plume has a Brother–Sister Team with Valmur and Phiona. Valmur, who wears blue, advises caution and temperance, and keeps his noble house from the civil war, while the Hot-Blooded Phiona is emotional and wants to pledge herself to combat, regardless of who it is.
In the Viewtiful Joe anime, Joe wears a red costume in hero form while Junior wears a blue costume in hero form. Joe is the strong, energetic, reckless one, while Junior is shaping up as The Smart Guy. The color-coding is reversed in their normal forms, however. And in the games (on which the anime is based), the blue oni is represented by Silvia who always tries to keep her boyfriend on task.
Lee is the blue to Kenny's red, though just how much bluer he is depends on the player's actions. Regardless of what you choose, he will always be at least slightly more reasonable than Kenny.
In Season 2, Kenny becomes the red to Jane's blue, always being more impulsive and easy to anger.
Christa is the red to Omid's blue. Christa is more serious and easier to anger, while Omid is the comic relief of the group.
The Wonderful 101 has an interesting case of this trope. Wonder Red and Wonder Blue fit this trope, however, their colors are switched. Wonder Red is the blue oni; leader of the Wonderful 100, rational thinking, and sticks with his team. Wonder Blue is the red oni; much more hot headed, quick to draw his valiantium blade, can be very reckless, and Wonder Green has to keep him from touching the buttons on any of the giant mechs.
While The World Ends with You's protagonists are a mixture of traits (Neku and Joshua being blue with red spots, Shiki and Beat being red with blue spots), a much neater organization can be found among the Reaper Organization. The best example of Red Oni, Blue Oni is probably Koki Kariya (Blue) and Uzuki Yashiro (Red).
Another Day also has this with Shuto (Red) and Neku (Blue). When picking colors for their Five-Man Band, Shuto got Red while Neku was stuck with Black 'n Blue, until he was demoted to just blue. It's even lampshaded by Joshua right before Neku's and Shuto's Slamming duel, calling it red and blue eternal rivals.
A much more direct example is Hanzo and Fuuma from World Heroes, particularly since Fuuma has two very ostentatious fire attacks and Hanzo's biggest super has him vanishing repeatedly.
Featured prominently with the two races added in the first World of Warcraft expansion. The arrogant and reckless Blood Elves have a red color scheme, while the more stoic and noble Draenei have a blue scheme. They even have red and blue underwear.
There is also Kil'jaeden and Archimonde. For this one, the colour is reversed, though: Archimonde is the red and Kil'jaeden is the blue.
To clarify: Archimonde is blue-skinned with the 'red' personality traits, while Kil'jaeden is red-skinned with 'blue' traits and personality.
Then in Wrath of the Lich King, Tirion and the Argent Crusade is the blue and Darion and the Ebon Blade is the red.
High Inquisitor Whitemane vs. Argent Confessor Paletress.
The Alliance vs. The Horde. The Alliance uses blue, gold, and white colors while the horde uses, red, black, and brown. The Alliance often involves elaborate tactics and stealth operations, not to mention diplomacy in their M.O. on the other hand, the Horde tends to just charge in headlong and have missions revovling around "smash that guy" and think the best way to get new allies is conquest.
In Mists of Pandaria the Pandaren that join the Horde and Alliance follow this quite closely. Aysa Cloudsinger, the Tushui adherent who joins the Alliance, advocates thinking about the best course of actions and tolerance, sometimes to the extreme of not acting because the best course of action isn't clear. On the other hand, Ji Firepaw, the embodiment of Huojin philosophy, prefers to act quickly and decisively, even if his actions are sometimes to the detriment of those he's trying to help.
X Com Enemy Unknown: Dr Vahlen and Dr Shen. Dr Vahlen is enthused by the potential discoveries that can be gleaned from examining the aliens, while Dr Shen is concerned and disgusted by what the aliens use the tech for and whether humanity might wind up treading the same path.
Xenoblade Chronicles 1 has Shulk and his childhood friend Reyn. The former is a methodical, nerdy engineer who likes to think things out before executing them, and is somewhat of a pessimist (Blue), while the latter is an impulsive Boisterous Bruiser bordering on Dumb Muscle specializing in combat (Red). However, their colors don't reflect this, with Shulk wearing red and Reyn orange as default.
The two Gods of the game also fit the bill. Meyneth, the Goddess of Mechonis, is an idealistic Blue Oni who wants humanity and Gods to coexist with each other and live in harmony. On the other hand, Zanza, the God of Bionis, is an egomaniacal Red Oni with a massiveGod complex, intent on consuming all life on Bionis through his swarms of Telethia and restarting the universe he created on repeat.
Xenoblade Chronicles X has Irina, a feisty soldier, and Gwin, her more laid-back brother-in-arms.
Two optional Blades, Praxis and Theory, follow this trope in a form of a pseudo-sisterly dynamic. Praxis (Red) is an outgoing Genki Girl, while Theory (Blue) is The Stoic who is cold to everyone around her.
Dominia and Kelvena, members of the Elements, are red and blue, respectively. Dominia is impulsive and vengeful, while Kelvena is calm and reserved. They even wear red and blue.
There's Fei, the brash martial artist, and Elly, the more composed officer. Fei's angers are a sight to behold and Elly is the only one who can calm him , and a flashback shows us that 500 years ago, during the diabolo's war, and even 40 centuries ago during the Zeboim era, she was already the blue, calmer part of their couple. Apart from Fei and Elly, there's Citan (so blue that, sometimes, it take time to understand that the man's really angry) and the red hot-blooded Bart. On the villain's side, there's Ramsus (who gets redder and redder during the course of the game) and Miang, who is so blue that it even affects her hair, or the trio formed by Id, Grahf (middle ground) and Krelian.
Fei is a complicated case in that he can be either the red or the blue depending on who the other person is. He's a definite red to Elly and Citan, but Bart is so red that he makes Fei look blue by comparison (and it helps that their respective Gears follow this motif).
Xenosaga has Shion as the emotional red oni, and KOS-MOS as the calm and emotionless blue oni.
In Yoshi's Story, the Red and Pink Yoshi have a more high-pitched voice than Green and Yellow's normal, and White Yoshi, Blue and Sky Blue Yoshi, and Black Yoshi have an even more low-pitched voice.
Zniw Adventure: There are two Euoplocephalus brothers, one colored red, and the other blue. The blue one is meek and kind of a pushover. He got stuck in the entrance of a bridge because some Troodon startled him. He claims that he can fight if necessary, but we never see him get aggressive. The red one is much more fierce and defensive. He actually yells at the Troodon to get out of his way.
make their convenient Oni colour-coding clear, if we didn't catch it the first time.