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So, after watching the Anime, I noticed that all the people, who inherited the
power of the Founding Titan, eye's change from their original colour to a
brilliant purple colour, whether they be royal blood or not, as evidence of
Grisha Jaeger. It should noted that the holder's eyes change colour almost
immediately after consuming the previous holder, as evidence by Grisha again
and Frieda Reiss. Based on what is seen and known thus far, it would make
sense that the purple eyes of the holder would signify that they are in
control of the Founding Titan, when compared to other Titan Shifters, like
Annie and Reiner.

Evidence A --
[here](http://attackontitan.wikia.com/wiki/Grisha_Jaeger_\(Anime\)) \-- Look
under the Titan Tab in the character details box.

This raises yet another question, why didn't Eren's eyes change colour after
he ate Grisha in the Woods? Is he not affected by the power of the Founding
Titan? Or does the power need to be "activated", like the Ackerman clan, in
order to use it at it's full potential?

I don't recall seeing anything about this in either the Anime or the Manga,
but I could be wrong and maybe missed something yet again.


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attack-on-titan
Why didn't Eren's eyes change colour when he inherited the Founding Titan?


## If you are not part of the Reiss Family, the founding titan's power impacts
eye colour on a case by case basis.

According the the [Attack on Titan
Wikia](http://attackontitan.wikia.com/wiki/Founding_Titan):

> When members of the Reiss family inherit the Founding Titan, they are
> affected by Karl Fritz's will, and at times, their normally light-colored
> eyes darken and emit a glow.

However, there seems to be no universal rule outside of the Reiss family. The
eye colour aspect seems to be tied in with how it affects memory and will but
as far as I can tell there is nothing official/canon so all we can do is
speculate.

**_So here is my speculation:_**

Inheriting the founding titan **and** will of another is what changes your eye
colour. This explains the Reiss Family as every one of them inherited Karl
Fritz's will. But (with only a few extra steps) this also explains Grisha
Yaeger.

So after eating Frieda Reiss, clearly Grisha did not inherit her will, instead
I think his eye colour change was because of Eren Kruger. Kruger had done some
horrible things to Grisha but in his final moments he defected, pushing his
comrade off the wall to save Grisha. He then went on to justify all his bad
deeds and answer any questions, explaining about the history of the founding
titan and King Fritz's goal urging him to help the with the restoration
project. He then injected Grisha with the titan serum and allowed himself to
be eaten. Grisha did go on to help the cause, starting a family and continuing
to investigate the ongoings of Paradise Island. My interpretation is that the
moment he ate Frieda was the point of no return, where symbolically he truly
inherited Kruger's will and thus his eye colour changed.

_To answer your actual question:_

Finally we have Eren Yaeger who's eyes remain green throughout. I believe his
eyes remain the same colour because of his overwhelmingly powerful
determination, ie. even after inheriting the founding titan his will remained
his own.


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Update: 2021/11/01 As Season 4: Episode 5 Near the end of the show, eyes color
change again, and I presume founding titan power can be control by Eren.


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