Nesa

Now, this may seem like a weird thing to say so I'm hoping to explain my point properly!

This reason why this may be true is because as I was watching AOT for like the 4th time I noticed how Eren's eye color was much more dull when he was attacking Marley.

This dullness can represent Eren not acting himself; he's doing things he wouldn't normally do. His eyes are almost lifeless, his true personality being shoved down as he commits terrible acts. Since it's from Armin's perspective, I assume that this dullness is how he perceives Eren not acting himself.

When Eren is acting himself, his eyes are that beautiful shade of green that Armin associates him with. Eren isn't shoving down his personality, he's now embracing it. His eyes no longer lifeless.

Before Eren passes, his eyes are vividly green once more; not dull. His feelings are genuine, now showing as he once struggled with being his true self before. This is a raw version himself that he so desperately tried to mask for his unobtainable dream. He's not trying to be something he isn't anymore. Now just regretful.

I can't even begin to imagine how lonely this Viktor must be. I assume that this Viktor is essentially immortal because he's been traveling for what seems to be lifetimes after lifetimes looking for a way to save universes that's been destroyed by other versions of him.

It makes me wonder how many times he's tried different solutions/runes to give in the universes he visits. His aging is most likely extremely slow since he's able to visit so many universes and watch how they turn out. He could be thousands of years old for all we know.

Mage Viktor most definitely doesn't find any sort of peace in his endless life. He's constantly surrounded by his actions that caused an extinction of all human life. He will always be reminded of how he was responsible for this lifeless land he's created that will stretch to countless universes. The guilt he must feel whenever he looks at the statue of Jayce. How he failed him in every way possible and trapped his soul with him forever.

In a small way, his madness brought himself a blessing; the ability to grow old. Viktor's sole purpose was to push himself to the limits, to succeed his life expectancy and grow old like everyone else around him. If only he knew the grief that growing old would bring him. Mage Viktor was able to succeed his shortened life, but at the cost of everything; at the cost of killing everything/everyone he loved and becoming an aimless man walking with little purpose.

In the leaks, we can see that the same bubble looking anomaly that formed over Ekko when he traveled formed over Jayce and Viktor. We can make an assumption that Jayce and Viktor traveled out of the void that the arcane created to somewhere else.

In theory, this would make perfect sense, but I'm curious about their mortal bodies. Both their bodies got sucked into the rune and the rune seemed to just destroy itself. Did their bodies get destroyed? Or did their bodies just travel elsewhere?

Going back to Ekko, from what we know there needs to be a body for a 'soul' to travel into.

But with Jayce, he didn't need his other body to travel into; he kept his same body. I feel like the arcane's time traveling isn't something that's set in stone; it's something that changes and adapts. Just like how the hexcore adapted to Viktor's blood/body; it's completely unreliable and unpredictable.

When the Ekko we know and grown to love starts to freak out in the alternate universe, Powder isn't necessarily too bothered by it. She's rather calm for having something chucked at her head and doesn't scold Ekko for doing it; almost like he's had an 'episode' like this before.

When Benzo comes in he says, "Another one those days." It's like he already knows what's going on with Ekko. With Powder's calmness and what Benzo says, we can assume that AU Ekko might have these episodes often. Spouts of moments where he forgets things and have to be reminded/startles when he forgets where he is.

When Powder realizes that Ekko might be having an episode, she tries to comfort him in a way by using humor, "You know those ugly twins, genius and madness." Genius is how brilliant AU Ekko is and the madness is his memory issues.

Another example of people alluding to Ekko's memory problems is when Ekko blurts out how Vander and Silco tried to kill each other. Instead of them getting extremely upset, they act like Ekko has asked this question before. Silco simply brushes it off and they both give Ekko a smile instead of a disapproving frown. They defuse the situation and made sure not to confuse Ekko.

One last example is when Ekko and Powder on together on the balcony. Their dialogue could potentially highlight the troubles Ekko has with his memory.

Ekko: You ever wish you could just stay in one moment?

...

Ekko: I promise I'll never forget this.