Well, they might be shocked at how much technology has advanced in the future depicted in the fanfiction. Maybe there are new types of elemental powers or different ways of training ninjas. It could also be that the relationships between characters have changed in unexpected ways, and they would have to come to terms with that.
The Dreamtale full story has several key elements. Firstly, there are the two tree spirits with their distinct positive and negative essences. These essences not only define their characters but also have an impact on the overall atmosphere of the dream world. Then, there are the events that are set in motion, which could be triggered by their own actions or by external factors. For example, any interactions they have with other entities in the dream world. Another important element is the very concept of the dream world itself, with its own set of rules and magic that govern the story's progression.
The Dreamtale story is complex. It involves two tree spirits, positive and negative. The positive spirit is associated with good things like hope. The negative one is more about despair. As the story progresses, their relationship changes due to various events in their world. In short, it's a story about balance, good and evil within the dream realm.
They might gain a new perspective on their own abilities. If the future fanfiction shows ninjas with enhanced powers, the past characters could start to think about how they could develop their skills further. For example, if in the future they can combine elemental powers in new ways, the past ninjas might start experimenting.
I'm not really into yaoi fanfictions, but generally, in 'dreamtale', Nightmare and Dream are two important characters. In yaoi fanfictions about them, it often explores their complex relationship in a romantic or emotional way. Writers might focus on their opposing natures, like Nightmare being more on the dark side and Dream on the light side, and how they interact and perhaps develop feelings for each other in this fictional context.
One popular theme could be redemption. Nightmare, being the more 'evil' of the two in the original concept, might find redemption through his relationship with Dream. Another theme could be forbidden love, as they are on opposite sides of the spectrum in 'dreamtale'.
I don't know who xqc is in this context without more details. It could be someone's username, a streamer, or just a name given to a character in a particular situation.
I'm not entirely sure specifically what 'xqc reacts to neuro story' is about without more context. It could be that xqc, perhaps a person or a character, is reacting to a story that has something to do with the neuro (which could potentially refer to neuroscience, neural networks, or something related to the nervous system in a more general sense).
One popular 'Overwatch Reacts' fanfiction could be the ones where the Overwatch characters react to different timelines or alternate universes. For example, they might react to a world where the Omnic Crisis was never resolved. Another could be their reactions to new heroes joining the team. It's all about exploring the characters' personalities through these reaction scenarios.
Some Tumblr blogs are dedicated to sharing and promoting AOT fanfictions, including the reacts ones. You can search for relevant tags like #AOTreactsfanfiction on Tumblr. Also, Reddit has some subreddits dedicated to AOT. You might be able to find links to AOT reacts fanfictions in the posts or comments there.