Red Oni, Blue Oni/Fanfic

• In the Great Chicken Miasma's Mario fanfic Better Off Alone, the young Yoshi Waffles is the Red to everyone else in the group's Blue.
• Calvin and Hobbes The Series has Dr. Brainstorm as the red oni, with his Foil Jack being the blue.
• In kirbystarwarrior's Disgaea: Jewel of the Gods fanfic, Laharl is the red oni to Adell and Mao's blue oni.
  • Adell can also, arguably, qualify as the red oni to Mao's blue oni.
• Eri's Game has Eri as the Red Oni and her best friend, Shiki, as the Blue Oni.
• To Kill a Thief has Light Yagami as red due to being crazy with Knight Templar ideas, while his partner, Miyako Toudaiji, is blue due to being sane with By-The-Book Cop tendencies.
• In White Rain, it is Sasuke who is the Red Oni to Naruto's Blue, strangely enough. Their relationships also have the same distinction.
• Winter War gives us Ikkaku and Nanao, the co-leaders of the Hueco Mundo mission. Ikkaku is a Hot-Blooded Blood Knight with a newly acquired habit of giving nicknames and a physical fighter with no aptitude for kidou. Nanao is a serious, methodical, control obsessive Badass Bookworm and kidou specialist who so far has avoided hand-to-hand combat.
• In Scooby-Doo! Green, Yellow, and Red and Wicked, All Over, there's also an infamous Weatherly sisters named Ingrid and Andrea Weatherly. They even have default crimson red and ultramarine blue outfits respectively.
• In Green Arrow: The Daughter of Irene Weatherly has the titular main anti-villainess Irene Weatherly being the loud, hotheaded red who'll jump into battle without a thought, especially if they've made her daughter Sabrina McInnis cry. Her brother-in-law Bradley "Brad" McInnis (Sabrina McInnis's paternal uncle) 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 Irene tends to punch and smash her enemies, while Brad uses shuriken-like projectiles.
• In Totally Spies: Purple and White and Death All Over, the hidden main villain named Fauntleroy Donaldson, who is much more eviler than Mandy and her cronies is definitely the villainous blue to Clover's heroic red.