Often, Naruto uses his experience from the future to improve relationships. He could help Kakashi deal with his past traumas earlier, making Kakashi an even better mentor. He may also befriend characters that were once his enemies in the original timeline. This can lead to a completely different alliance system in the ninja world. And he might even try to reform the ninja academy, basing it on what he learned about the importance of a well - rounded education in his future life.
In some of these fanfictions, Naruto goes back and tries to save his parents. He might use his knowledge of the future to outwit the enemies that were once too powerful for his family. Also, he could introduce new jutsus earlier in the timeline, which would change the power dynamics in the ninja world. And sometimes, he gets involved in the politics of the village much earlier, trying to make Konoha a more just place from the start.
Well, one possible plot development could be that when Harry gets his parents back, they have to quickly adapt to the modern wizarding world. His parents were from an earlier time, so things like new spells and magical devices might be quite a shock for them.
One possible plot development could be that the village is thrown into chaos without Naruto. His friends might initially feel lost but then come together to find a way to bring him back. For example, Sasuke could put aside his differences and join forces with the others, realizing Naruto's importance to the village and to him personally.
One idea could be Percy going back in time to the era of the first Olympian gods and having to deal with the raw, unbridled power of those early deities. He might find himself in the middle of a power struggle between Zeus and his father, Kronos, before the Titanomachy. Another plot could involve Percy trying to prevent a major disaster in the past that has far - reaching consequences in his own time. For example, stopping the release of a powerful monster that was supposed to be sealed away long ago.
Obviously Naruto himself is the most affected. He has to deal with the knowledge of the future and the changes he wants to make. Sasuke is also important. Naruto might try to change Sasuke's path to prevent him from going down the dark road of revenge. Kakashi could be another one. Naruto may share his future knowledge with Kakashi to make him a more effective teacher and ninja.
In this fanfiction, perhaps Naruto uses the Caged Bird Seal to his advantage in a unique way. For example, he could find a way to tap into the seal's energy and use it in his battles. This could make his fight scenes more intense and unpredictable. Also, the seal might attract the attention of some powerful enemies or allies who are interested in its power.
One interesting plot development could be Naruto using his time - control ability to prevent the death of his parents. He might go back in time and change the events that led to their demise, thus altering the whole Naruto universe as we know it.
Well, perhaps in the fanfiction, when they go back in time, Harry and Daphne end up changing the Hogwarts houses. Since they know different things about the students, they might influence the sorting hat. This could lead to new friendships and rivalries, completely altering the social dynamics at Hogwarts.
In certain fanfictions, Dumbledore could get caught in a lie. Maybe he told the students one thing about a particular magical artifact, but then was caught when it was revealed he knew more than he let on. This would create a lot of drama as the students and other faculty members might lose trust in him for a while.
In some 'Nightwing gets captured' fanfictions, he might be captured by a powerful villain like Deathstroke. This could lead to intense fight scenes when his friends come to rescue him. For example, Batman and Robin might team up, using their detective skills to find Nightwing's location.
One plot development could be that Hiccup discovers an ancient technique for building stronger dragon saddles. This new saddle design not only gives him better control over Toothless but also allows him to perform more advanced maneuvers. As a result, he becomes a more formidable rider and his reputation as a dragon trainer grows.