Great question — answering as the UphillTech team:
Warning: Spoilers As said before by @JakeM, colors usually tend to have psychological meanings, but I would have to disagree with his meanings. I think its simple to explain most of the meanings. I'll leave other sources with some other information at the end. Light Yagami/Kira - Red His hair and eyes go red. Red is usually associated with Rage, Fierce, but in anime, its also associated with evil intentions . It is extremely common for villains to have red eyes. We may assure Light is the villain here, even though he does not suffer from rage. L - Blue His hair and eyes go blue. L is much more obvious than Light if you know the colors meanings. Blue is often associated with wisdom and...
Full answer by LeonX: https://movies.stackexchange.com/a/78623 (CC BY-SA 3.0).
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