Red Oni, Blue Oni/Web Original


 * While most of the characters tend towards red oni, Red vs. Blue has a bit of this going on in the different teams, mostly their leaders. Church, the man in charge of the blue team, is fairly on-the-ball and tries to get things done, and he took over from Butch Flowers, a soft-spoken, thoughtful man whose only flaw seemed to be in thinking that the whole Red Army versus Blue Army conflict was something of a game and strategizing accordingly (in a flashback, when Church reports on Red activity, Flowers refers to them as "Those rascals!" in a no-hard-feelings sort of way). Sarge, leader of the red team, puts exactly no thought into his battle plans beyond how they can be used to kill Grif, but he goes at them with such a fervor that, if he did think about his plans for three seconds straight, he might actually win.
 * On a more individualized level, the Freelancer Dakota twins. North is the Blue Oni--calm, cautious, and strictly by-the-book during missions, and rather mild-mannered and friendly during downtime. South is the Red, a hasty, Hot-Blooded Leeroy Jenkins during battle, and bitchy, abrasive, and almost anti-social the rest of time.
 * Gantz Abridged actually calls this trope out in a full-on Shout-Out to the TV Tropes Wiki, with an actual Red Oni alien telling a Green Oni alien that he's supposed to be Blue and asking if they're subverting the trope. The trope is then furthered carried out when the Red Oni decides to immediately resort to smashing things, to which the Green Oni replies, "You WOULD say that."
 * And in Hbi2k's earlier work, Berserk Abridged, Zodd compared Guts and Griffith to Naruto and Sasuke. Griffith however believed that Guts should fulfill the Sasuke role since he's the angstiest of the two.
 * Egoraptor's anime parody Girlchan in Paradise contains two non-human characters, one with blue skin and one with red skin. The blue one, Kotobarusan-sama, is a cool and collected Old Master, and the red one, Galacti(ca)maru, is a power-mad Large Ham who likes smashing through walls and happens to be the Big Bad.
 * Desu Des Brigade has the two female reviewers JesuOtaku and Vixen to match up to this trope. While Vixen is the more emotional and tends to freak out more often (see: Papa To Kiss in the Dark), JesuOtaku is far more reserved and analytical. The same goes for Professor Otaku and Arkada, though not nearly as stark of a contrast.
 * The Sentinel and Overseer of Gaia Online.
 * Interesting case: they fit the roles to a T during the Halloween event, but then get partially inverted during the Xmas event.
 * We're Alive has Latch as the blue with Scratch as red.
 * The Mondo Media series Dick Figures features a red stick man and a blue stick man with distinctly opposite personalities.
 * In Everyman HYBRID, HABIT and The Slender Man come off this way, especially in the fights between the two on Twitter. (Yes, Slender Man actually says something. It's actually pretty creepy.) HABIT types in ALLCAPS and is absolutely insane and unambiguously evil. Slender Man seems condescendingly amused by his shenanigans and his messages are typed normally.
 * Before HABIT's nature came to light, The Rake was typically thought to be the Red Oni instead.
 * Invoked in Survival of the Fittest during a fight scene between Maxwell Lombardi and Maria Graham, who have red and blue streaks in their hair respectively. Though, in this case, it's inverted, as Lombardi is the cool, calculated, and ruthless one and Maria is the energetic goofy one (going even farther into red territory when she succumbs to murderous rage during the fight).
 * Lyle and Dex of Sanity Not Included. It's even displayed in the title sequence.
 * When Po Ping and Tai Lung arrived in Ink City at the same time, both ended up on the Paint Side of the currently split City and wound up temporarily recolored in the spirit of this. Po found his black and white replaced with vibrant shades of red and yellow and deemed his unexpected makeover awesome. Tai Lung, on the other hand, finds his fur turned various shades of blue and was considerably less amused.
 * The Questport Chronicles has the DuLac sisters, with Sabriel as the Blue Oni and as the Red.
 * Protectors of the Plot Continuum gives us Agents Suicide (Red Oni Spartan squire) and Dio (Blue Oni who does not even have a registered Lust Object).
 * Suicide is also Red Oni to Ithalond, (yes, that Ithalond) and Rowan.
 * Agent Lux is Red Oni to any Agent she works with.
 * Which of Jay Thorntree and Acacia Bird is the Red Oni is determined by whether Elrond or Boromir (respectively) is more OOC.
 * Tawaki Penguin's Bloodwrath makes him Red Oni to Dustin O'Grady's Blue. Dustin is also implied to be Blue Oni to his sister Madison's Red.
 * Agent Ilraen is Red Oni to Supernumerary's Blue.
 * Shiny Objects Videos: "An Earnest Discussion" places Curly as the Red Oni with Daniel as the Blue. According to Word of God, there were plans for several more videos with a similar theme, but were lost due to Development Hell.
 * Demon Thesis has the contrast between Val and Clady. They're two of the main characters, college roommates and friends, but Val is Hot-Blooded, impulsive, aggressive, and develops a slightly disturbing passion for burning things after being gifted with the Elemental Power of fire, while Clady is a level headed Deadpan Snarker intellectual who gets wind powers that can trap enemies in Anti-Magic fields.
 * Equestria Chronicles...has too many examples to list.
 * Lewis is often this to Simon in the Yogscasts; other times, it's subverted.
 * In the Burning Bridges Pokemon Fire Red Nuzlocke, Moira's the calmer foil to Donahue the Squirtle, which is fitting, since the two of them used to be partners in the police force. See for yourself. Ironically, Donahue's body is largely blue and Moira is a redhead.
 * Kyle from Statless and Tactless is the level, balanced player to Joe's sociopathic antics. They even have blue and red text.