Be honest. What theory or things did you think or try guess that was wrong in this show

It made perfect sense to me. You can't change fate, which is exactly what he was seeing.

Think of Erens memories like a river flowing toward the ocean. You can see the river's course from where you stand, and you can even try to paddle or steer your boat in different directions. But no matter how hard you try, the river will always pull you back toward its natural flow, heading to the ocean. The current is already set, and the path is predetermined. Even if you know where the river leads, you're still carried along with it because the force of the current can't be resisted. You can’t change the destination, you can only experience the journey.

@Fenyy The only reason predetermined events are unchangeable is because they can't be known for certain beforehand, they can only be predicted but predictions don't always come true. If the future could certainly be known beforehand, then the existence of this information would influence the present, and consequently the future as well, creating an endless causality loop with indeterminable outcome.

@Zarutaku The idea that predetermined events are changeable because they can be known for certain beforehand misses the point. Just because we can predict the future with certainty doesn’t mean it’s not already set. It’s possible for events to be predetermined even if we can foresee them perfectly. The fact that we might know what’s going to happen doesn’t change the fact that everything is already unfolding according to a fixed path.

The argument that knowing the future would create a causality loop assumes that knowledge of the future automatically changes the present, but that’s not necessarily true. Knowing the future might help us understand it, but it doesn’t always mean we can change it. In a world of determinism, (meaning every event is causeby prior events in a chain), then knowing the future wouldn't change the course of events. In this view, the future is already set, and no amount of knowledge would alter it. In this case, knowing the future wouldn’t give you power to change it. the future is set by the past and present, regardless of whether we know it or not. So, even if Eren sees the future, he’s still part of a pre-established system, and his actions don't change the ultimate outcome.

Ultimately, in my opinion, Isayama created this world knowing it would be a world flxed by the laws of determinism. The thing that you actually need to remember here is that we as humans don’t know for sure whether knowledge of the future can change the present at one's will. It’s a complex and speculative question that touches on philosophical debates about free will, determinism, quantum mechanics and our overall understanding of the nature of time. It's all speculative at the end of the day my friend.

Isayama created the story. What he says goes, Eren's fate is as unchangeable as the story Isayama published. If we see the laws of the universe and time in that way, then it's pretty easy to understand why he can't change the future.

Imagine that the seen future already had the info put back into the past, so even when it 'first' happened, the info was already there, so no need for a change, everything still happens zhe same way as before

@Fenyy I never said that predetermined events are changeable, that's an oxymoron. Neither did I argue against determinism in general, but the fictional ability to see information from the future implies that information is transferred back in time, which alters the information state of the present, and the new future would happen based on this altered state, so it seems virtually impossible that new future would be the exact same as the previous one.

@Zarutaku Dude you assume that gaining knowledge of the future must necessarily alter it, but in a deterministic system, even the acquisition of knowledge is just another cause leading to an inevitable effect. Eren’s actions don’t change the future..his actions ARE the future, dictated by the chain of cause and effect. Ultimately, Isayama built a world where time and fate are locked in place, meaning Eren’s knowledge does not disrupt causality but rather fulfills it. Within this framework, the future is not something that can be rewritten, itis simply something that must be lived.

In Attack on Titan, time operates on a fixed timeline my guy, meaning the future Eren sees isn’t just one possibility, it IS the future that was always going to happen. His knowledge of future events doesn’t "transfer back and change the present" in a way that creates a different future.. rather, the version of the future he saw already includes the fact that he saw it and acted accordingly in the only way he physically could. This follows the logic of a self-consistent time loop, where everything that happens, including Eren's knowledge and actions, was always part of the unchangeable timeline.

What if he tried to actively change things which he said he did you might ask?
Even if Eren wanted to defy what he saw, every choice he makes is still guided by the same cause and effect system that led to that future. The idea of him ‘choosing’ something different is an illusion because his thoughts, emotions, and decisions were always leading to that singular outcome.

This is a fixed time line, the things he saw himself doing were just that.. Yes, he took actions in the past, but those actions were already part of what he saw himself doing. He was never altering the future—he was fulfilling it.. That's not free will, that's continuing down a path that's exactly as he saw.

You also have to remember that he didn't see everything. He didn't even know which of his friends would survive and which would die.. he said it himself. He saw glimpses of the future, not everything. If he saw literally everything then your argument might hold more value as you can see literally the entire outcome in immaculate detail.. however when you only see glimpses, you don't see the whole picture. In that sense, every action you do take, even the ones that are meant to prevent the overall outcome, in this world and system end up ultimately becoming PART of that outcome that he saw.


I understand your point clearly and its valid when talking about the theory which many time-travel theories hold which is, simply knowing the future should create a paradox or a new timeline. However, Attack on Titan doesn't operate under a "changing the future" model, it operates under a "fulfilling the future" model. Both are right because neither can be physically proven. Its all theoretical. Its just what lens you end up looking through. In this case, aot clearly doesn’t follow the traditional paradox-based model of time travel, but rather a deterministic one where the future isn’t rewritten..it is realized.
Once you accept that the timeline is fixed, everything clicks into place naturally and makes sense.

Quoting myself from above:

@Zarutaku
See, now that's where you're getting things mixed up. Your reasoning makes no sense because you clearly don’t understand the difference between infinite timelines and deterministic timelines. The fixed timeline model in Attack on Titan doesn’t require the existence of infinitely many identical timelines—that’s just nonsense. In the deterministic universe the series presents, there's only one self-consistent timeline—a single, unbroken chain of cause and effect where every action, including Eren's foreknowledge, is already woven into the fabric of events.

You're completely misunderstanding the difference between infinite or branching timelines and a deterministic timeline. In a deterministic framework, the future is fixed, and knowing it doesn’t create new timelines—it simply confirms the inevitable outcome. So, saying this model "could only work" if there were infinite interconnected timelines is just flat-out wrong. You’re trying to argue against something that was never part of the discussion in the first place.

This isn’t a debate at this point, this is just you failing to grasp basic concepts. Attack on Titan clearly operates under a fixed timeline, where everything is predetermined. Eren’s actions aren’t about altering fate but fulfilling it. If you still don’t get it, that’s not my problem.. you need to educate yourself on the difference between deterministic and multiverse-based time theories before coming back with arguments that actually make sense. Otherwise, you’re just embarrassing yourself at this point.

But if you'd like to try and explain and justify like I did with my argument, why exactly you think that could only work if there were infinitely many identical timelines interconnected, rather than just saying this is how it is with out any reasoning or explanation, i'd be happy to hear it, and disprove it for you.

@Fenyy Because receiving information from the future implies that there must be another timeline where this future already happened.