

For eg, consider Ghouls in Tokyo Ghoul, Naruto Sharingan, [Shinji vs Zureal in
Eva 2.0](https://www.youtube.com/watch?v=R-YpzNed148), Code Geass when Lelouch
activates his power etc etc.

Why in all these shows is it taken that getting red eyes mean one activates
power?


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Why is power ups associated with red eyes in anime?


Red is known to be a strong/intense color and so when the character power
upgrades, the eye color changes to red meaning implying them having a strong
characteristic in the form of bravery and not fearing anything. It follows the
character going into a berserk-state and display of huge burst of power.

Let's take the example of Sharingan. Sharingan activates when a characters
goes through a sense of overpowering hatred or rage on the loss of their
dearest person and the most obvious color for indicating it is red (the most
fitting display is Obito Uchiha activating Mangekyo Sharingan). It is also
noted that fire-wielders or the person who can control fire should have red
eyes, matching their destructive ability and Uchiha clan have a natural
affinity for the fire nature transformation. Uchiha are not truly considered
adults until they can successfully perform the Fire Release: Great Fireball
Technique strong enough to overcome Water Release.

Not only red indicates a fictional powerbuildup, but a normal human being can
sometimes rage and the animators change the eye color to red. E.g. Levi from
Attack on Titan was fighting the Female Titan. Canonically his eyes are a dull
gray color, but the directors had him change his eye color for that specific
scene to highlight his mental and physical state he was in.

**Reference** : Anime And Manga Eye Color By Hrvoje Milakovic

  * [2021 article](https://fictionhorizon.com/anime-and-manga-eye-color/)
  * [2022 article](https://voicefilm.com/anime-and-manga-eye-color-meaning/)


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