doge-w-a-bloge:

So! There seems to be a lot of wondering going on about EYE COLORS lately, so let’s put a few bits of information on the table.

The corrupted pacifist ending bedroom scene has been variously taken to mean that Chara’s eyes, or more recently Frisk’s eyes, are canonically red.

In Frisk’s sprites, the eyes are black (#000000). In Chara’s end-of-NM sprite, the eyes are slightly lighter, being the same shade of dark brown (#3d120e) as Frisk’s hair and outline. From this, you might decide that Frisk’s eyes are canonically black, and Chara’s dark brown. However, the eyes/pupils of nearly every monster character are depicted as #000000 on overworld sprites for the sake of visual clarity, including…

…Toriel, whose eyes we know to actually be very dark red (#400000) from her battle interface sprites. So we cannot say for certain that Frisk’s or Chara’s eyes are black/brown, just because of their sprites. They could easily be red like Toriel’s are.

On the flipside, we cannot say for certain that their eyes *are* red, either.
The bedroom scene, from the corrupted pacifist ending, has been used to argue:

1. Chara’s canon eye color is red, because they are possessing Frisk in this scene.
2. Frisk’s canon eye color is red, because it is their body that is getting possessed.

But it should be noted that the red (#ec1c24) seen here is clearly not natural, in any case; F/C’s eyes are brightly glowing in a dark room, which is not a normal thing for human eyes to do. Ever.
Also, Frisk’s face and clothes seems to have instantaneously shapeshifted into Chara’s in the corrupted endings, and that’s also not a natural phenomenon. (lol)

tldr: who the fuck even knows