History RedOniBlueOni / ComicBooks

** May Parker (Blue) and [[spoiler:her [[CloningBlues clone]] April]] (Red) have elements of this, especially once [[spoiler:April]] turns into [[spoiler: DarkActionGirl BloodKnight]] [[MeaningfulName Mayhem]]. Their color schemes are the opposite of their personalities, though.

* Raphael and Leonardo of ''ComicBook/TeenageMutantNinjaTurtles'' are Red and Blue oni respectively: Leonardo is the calm, thoughtful, and self-controlled leader of the team, when Raphael is the easily-angered, hot-tempered rebel. It's even lampshaded by their bandanas.

* Danael and Gryf from ''[[ComicBook/LesLegendaires Les Légendaires]]''. Danael is a usually calm and collected [[ThePaladin paladin]] who likes controlling events, tends to plan everything before battle and [[UnresolvedSexualTension had apparently difficulty]] confessing his feeling to [[TheHeart Jadina]] [[spoiler:(though, eventually, [[TheyDo he did]])]]. He means the right thing, but will occasionnally be ready to go to extreme measures for the greater good and act like a borderline WellIntentionedExtremist. Gryf, on the other hand, is a BookDumb, AntiHero who has no problem doing things like cheating at games, is described as the bravest of the Legendaries, and usually lets his emotions and instinct lead him, but is notably more relaxing than Danael. Both are still best friends, however.

* Danael and Gryf from ''[[ComicBook/LesLegendaires Les Légendaires]]''. Danael is a usually calm and collected [[ThePaladin paladin]] who likes controlling events, tends to plan everything before battle and [[UnresolvedSexualTension had apparently difficulty confessing his feeling to]] [[TheChick Jadina]] [[spoiler:(though, eventually, [[TheyDo he did]])]]. He means the right thing, but will occasionnally be ready to go to extreme measures for the greater good and act like a borderline WellIntentionedExtremist. Gryf, on the other hand, is a BookDumb, AntiHero who has no problem doing things like cheating at games, is described as the bravest of the Legendaries, and usually lets his emotions and instinct lead him, but is notably more relaxing than Danael. Both are still best friends, however.

* The loony and spirited ComicBook/HarleyQuinn is the Red Oni to [[ComicBook/PoisonIvy Poison Ivy's]] cool and methodical Blue Oni; while Harley dresses in the color associated with a Red Oni, Ivy is clad in green (like her namesake).

* ComicBook/CaptainAmerica and ComicBook/IronMan play with this trope. They wear the respective colors of a Blue and Red Oni, and seem to fit those roles accordingly, with Cap being the responsible, upstanding leader of the Avengers and symbol of all that is good in his country, and Iron Man being a billionaire playboy who often struggles with alcoholism and his own neurosis. However, when the situation calls for it Cap is more than willing to take a stand and do what he feels is morally right, even if it means breaking the law and and defying the government, [[TheMcCoy and is guided more by his emotions]], while Iron Man tends to be more pragmatic and logical in his decisions and philosophy,[[note]]Just not to the extent of being TheSpock.[[/note]] and will go to any lengths to protect the world, even if goes into KnightTemplar territory.

* ComicBook/CaptainAmerica and ComicBook/IronMan play with this trope. They wear the respective colors of a Blue and Red Oni, and seem to fit those roles accordingly, with Cap being the responsible, upright leader of the Avengers and symbol of all that is good in his country, and Iron Man being a billionaire playboy who often struggles with alcoholism and his own neurosis. However, when the situation calls for it Cap is more than willing to take a stand and do what he feels is morally right, even if it means breaking the law and and defying the government, [[TheMcCoy and is guided more by his emotions]], while Iron Man tends to be more pragmatic and logical in his decisions and philosophy,[[note]]Just not to the extent of being TheSpock.[[/note]] and will go to any lengths to protect the world, even if goes into KnightTemplar territory.

* During the DorkAge when Franchise/{{Superman}} was an energy being, he was briefly split into two separate characters, the calm and rational Superman-Blue and the hotheaded Superman-Red. This was actually inspired by a classic Silver Age Imaginary Story -- though in that, both Supermen were more or less the same.

* You could make a good argument for Franchise/{{Batman}} (the cool, calculating Blue Oni) and Robin (the more impulsive Red Oni). Batman is also a Blue Oni to [[ChaoticEvil The Joker]]'s Red Oni.

** This is reversed in ''ComicBook/GrantMorrisonsBatman'', where original Robin Dick Grayson takes over the role of Batman, while Bruce's son Damien becomes Robin. Dick is cheerful and spirited, Damien is somber and brooding. This also mirrors the dynamic between Dick-as-Nightwing and both Nite-Wing and the Red Hood.

** Sort of a running theme with Deadpool, actually. Another example of a Blue Oni paired up with him is ComicBook/{{Taskmaster}}, a level-headed mercenary whose unique abilities are based around observation and analysis and who will typically run away from a fight if he determines that he can't win it, in contrast with Deadpool's typically cheerful, brainless recklessness, but the most striking comparison is probably with [[TykeBomb Domino]], who, like Deadpool, is the cast-off product of a secret government SuperSoldier program and favours the same style of costume and equipment (even wearing what was essentially a blue-and-black woman's version of Deadpool's distinctive red-and-black bodysuit in the ''Cable & Deadpool'' series), but is typically cold, clinically rational, and often emotionally conflicted over her actions, and her special ability is essentially not getting hit ''at all'' in a fight, where Deadpool's powers effectively allow him to [[IncrediblyLamePun wade]] anything that's thrown at him.

** Comicbook/{{X 23}} also serves as Blue to Wolverine, which stands out even more because she's his teenaged OppositeSexClone.

* Dream of the Endless in "ComicBook/TheSandman" is blue oni (the kind with lots of inner turmoil) next to virtually everyone he encounters. Most notably he plays the role throughout his relationships with his ever-cheerful and sociable sister Death and with his rambunctious brother Destruction. In Brief Lives in particular he plays blue to the red of his sister Delirium, who is impulsive to the point of, well, delirium. The only character who is more of a blue oni than Dream is the eldest sibling Destiny (and this one without the inner turmoil).

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* ''ComicBook/SinisterDexter'': the titular duo occasionally bounce back and forth, but for the most part, Sinister is red - fiery, impulsive, tempestuous, and bold - while Dexter is blue - calculating, calm, generally level-headed and slower to anger. This is even reflected in their choice of weaponry, with Sinister wielding a huge hand cannon that's essentially a scaled-down shotgun that tends to do a lot of explosive damage, while Dexter sports a pair of deadly-accurate 9mm handguns that leave his enemies dead with little collateral damage.

** This is reversed in ''ComicBook/GrantMorrisonsBatman'', where original Robin Dick Grayson takes over the role of Batman, while Batman's son Damien becomes Robin. Dick is cheerful and spirited, Damien is somber and brooding. This also mirrors the dynamic between Dick-as-Nightwing and both Nite-Wing and the Red Hood.

** ''ComicBook/SupermanReborn'' reveals [[spoiler:Superman is actually ''both'' ends of the trope. When the ''ComicBook/{{New 52}}'' continuity was created, Superman was separated into his pre-''ComicBook/{{Flashpoint}}'' and ''New 52'' selves. The younger and brasher ''[=N52=]'' Superman is red while the calmer and more mature pre-''Flashpoint'' Superman is blue; even having the same aura colors. This is clearly a reference to the Red and Blue era. At the end of the story, they combine into a single, complete version of Superman; ensuring his integration into the new DC Universe.]]

* ComicBook/{{Wolverine}} (Red Oni) and ComicBook/{{Cyclops}} (Blue Oni) - Wolverine's color may be yellow, but he's easily the Red Oni of the team.
** Cyclops is probably the Blue Oni for everyone in the team too, and honestly most people he interacts with in the Marvel Universe as well. Ironically with his relationship with his brother Havok, their signature energy colours are reversed.
** Comicbook/{{X 23}} also serves as Blue to Wolverine, which stands out even more because she's his teenaged OppositeSexClone.
** Wolverine's longtime friend Comicbook/{{Nightcrawler}} is a spiritual, guiding blue to Wolverine's red, though he can be as fun-loving and swashbuckling as a jolly red himself. For extra humor, he is literally blue and demonic-looking. And wears red in his iconic costume.

* ComicBook/CosmicBoy plays the coolheaded more rational blue to Lightning Lad's impulsive quick-tempered red in all incarnations of the ComicBook/{{Legion of Super-Heroes}}, though Cos' tenure with the team generally lasts longer. Amusingly LL usually has some blue in his costume and Cos in generally dressed in variations of pink--a tint of red--though he has had at one predominately blue uniform.