Just to add a little to the kingdom hearts Red oni Blue oni I believe, Sora as Red to Riku as Blue, Terra as Red to Aqua Blue should be touched upon just my opinion but I'm sure to most fans of the series those stand out as obvious too.

It says I can't edit the page. I wanted to add some examples I beleive would be helpful to it. Is this a glitch in this system?

Lots of the examples are just people who happen to be red and blue, without any relevant personality traits. (One example simply points out that the game Ikaruga uses alternating red and blue energy blasts. *Facepalm*)

Surely that's missing the point, and should be pruned? I won't dive in and start deleting things myself, because I'm a new troper.

[Double post, sorry.]

Black and White Manga

Gilgamesh and Enkidu, I can't decide if they fit this. Thoughts?

Red/Blue/Green

First off your basic Oni description omits the female Oni of which Urusei Yatsura is almost not a subversion.

Second the three magical girls go red/blue/green even more than red/blue guys show up. (And it ain't Freudian Trio because it's not coming from Western roots.)

A quick list: PPG, MKR, Project A-ko, EVA, FLCL, OMG, etc.

As soon as you see either the elemental power, appearance or personality of one of these girls you can quickly guess the other two attributes.