Red Eyes

[Piamonte]

Silvanas eyes turns from red to blue when the two fragments of her soul are reunited, it also goes to show that her "good side" is in control now, but she is not the only one with red eyes, nathanos and the dark rangers also have their eyes red and last i checked they were not killed by frostmoune, so their souls are complete. They have red eyes because they are the special type of undead that have their body in perfect shape, but what does the red eyes mean for them now considering what happened with Silvanas??.

[Rendark]

It means nothing dude.

[Lodidop]

Just aesthetics bro

[Frood]

Albino rabbits have red eyes too. Does that mean they are the spawn of death magic and witchcraft?

Here's a hint: Yes. Yes, it does. They must be hunted down and burned at the stake. Please, for the love of god, do it before they murder us.

[Piamonte]

Just aesthetics bro

i has to mean something now they made lore out of it.

[Skirdus]

You're asking Blizzard questions they aren't even asking themselves

[Aresk]

i has to mean something now they made lore out of it.

Red eyes generally are a sign of corruption (e.g. orcs). It likely just means that Sylvanas has severed her connection to the force that is corrupting her. Without further information, we can't really determine what specifically caused red eyes for the others or what would change them.

[Lochton]

Red eyes generally are a sign of corruption (e.g. orcs). It likely just means that Sylvanas has severed her connection to the force that is corrupting her. Without further information, we can't really determine what specifically caused red eyes for the others or what would change them.

This is the most likely one, but for now, it is just storytelling aesthetics

[Shadowferal]

I get red eyes too when I stay up all night.
...and yea. I do feel evil in those moments.

[Aucald]

Glowing red eyes has kind of always been Warcraft's aesthetic sign of advanced or severe corruption/evil, indicating a being whose essential alignment was skewed toward that end. Sylvanas' eyes turning blue is an indication that she's regained some aspect of her previous humanity, and that the corruption of becoming a Scourge banshee has been resolved to some degree. I don't think it's a strong lore-related lever, so to speak, but more just a way to indicate that something in her essential nature has been dramatically shifted.

[Progenitor Aquarius]

I get red eyes too when I stay up all night.
...and yea. I do feel evil in those moments.

Hahaha! Evil things like what?
I once had two little rats they had evil red eyes. Later I found out that the reason they had those eyes was a genetic alteration.

[Aydinx2]

it also goes to show that her "good side" is in control now

No. There is no good side. There's also no evil side. It's just a stasis version of the same soul, that forced Sylvanas to rethink what she did from the perspective of her old self.

It is entirely possible there are other reasons for having red eyes. Nathanos can easily have red eyes for another reason than Sylvanas.

[Maljinwo]

Because blizzard thought they needed a cosmetic change to reflect that Sylvanas was not the same anymore

Nothing more
Nothing less

[loras]

Albino rabbits have red eyes too. Does that mean they are the spawn of death magic and witchcraft?

Here's a hint: Yes. Yes, it does. They must be hunted down and burned at the stake. Please, for the love of god, do it before they murder us.

Fear the spawn of Carbannog.

(except my own rabbit, cutest thing ever - when he's not soiling his snow white fluff by blowing ubbles in random rain puddles anyhow)

[Mic_128]

Silvanas eyes turns from red to blue when the two fragments of her soul are reunited, it also goes to show that her "good side" is in control now

It's not a matter of "good side and bad side" but now she has her conscience and full range of emotions back.

Glowing red eyes has kind of always been Warcraft's aesthetic sign of advanced or severe corruption/evil, indicating a being whose essential alignment was skewed toward that end.

Not just Warcraft, but with basically anything in media. Red eyes is bad/evil.

[Shadowferal]

Hahaha! Evil things like what? I once had two little rats they had evil red eyes. Later I found out that the reason they had those eyes was a genetic alteration.

Hmm..."Mom, dad? Can we talk?"

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Not just Warcraft, but with basically anything in media. Red eyes is bad/evil.

Bumblebee, (Transformer) his eyes turned red when he lost his temper.

[Athorha]

Hmm..."Mom, dad? Can we talk?"

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Bumblebee, (Transformer) his eyes turned red when he lost his temper.

In Beast Wars quite a few characters had red eyes, could signify a more animalistic representation of their psyche.
I think with anything though X doesn't mean anything particular until a lack of X or a state of not X is also present until such occurs it's more of an aesthetic choice done by the artist.

[ohwell]

Silvanas eyes turns from red to blue when the two fragments of her soul are reunited, it also goes to show that her "good side" is in control now, but she is not the only one with red eyes, nathanos and the dark rangers also have their eyes red and last i checked they were not killed by frostmoune, so their souls are complete. They have red eyes because they are the special type of undead that have their body in perfect shape, but what does the red eyes mean for them now considering what happened with Silvanas??.

There is no "good side" and no "control" as that's headcanon to state otherwise. As far as anything that we've been shown, already is that merging the souls only makes you complete and that neither is good or bad inherently.

[Fyersing]

The realistic answer is that blizzard didn't even consider the ramifications of the change before moving forward with it — but that doesn't mean there won't be an explanation, at some point, so it can't hurt to throw a little bit of speculation into the discussion until then.

As of this moment the Forsaken have presented with three different eye colors: Yellow, Blue, Red. The onus is on us to postulate the reasons why.

[Ersula]

The realistic answer is that blizzard didn't even consider the ramifications of the change before moving forward with it — but that doesn't mean there won't be an explanation, at some point, so it can't hurt to throw a little bit of speculation into the discussion until then.

As of this moment the Forsaken have presented with three different eye colors: Yellow, Blue, Red. The onus is on us to postulate the reasons why.

The answer is really simple: It's magical.

And the color has nothing to do with morality but just different flavors of magic: Yellow is holy or chaos. Blue-green is necromantic. White is arcane. Purple is shadow. Green is fel or nature. Red is pain. That's how they designed Revendreth.... Red, vengeance, blood, vampirism, etc.