In this fanfiction, Peter Pettigrew could find himself in a world where the wizarding society has changed drastically. For example, there could be new spells and a different social structure. He might struggle to adapt, as he is used to the old ways. He could also encounter descendants of his former acquaintances, which would lead to some really interesting interactions. They might judge him for his past actions or he might try to redeem himself in their eyes.
There might be new witches and wizards who have heard of his story. They could be either fascinated or disgusted by his past deeds. He may also run into future versions of Hogwarts professors. They would probably be very different from the ones he knew, with new teaching methods and different personalities.
In the 'hogwarts meets the future fanfiction', there could be a great exchange of knowledge. The Hogwarts students could learn about future sciences like advanced astronomy or genetics, while the future people could be amazed by the magic of Hogwarts. There might be a character from Hogwarts who becomes a bridge between the two worlds, teaching future people about magic and in turn learning about their advanced technologies.
Perhaps in the 'Peter meets the avengers fanfiction', Peter is initially seen as a nuisance by some of the Avengers. But as time goes on, he proves his worth. He could help Iron Man with some tech - related problems using his scientific knowledge. And there could be a big battle where Peter's quick thinking and agility save the day for the Avengers.
Well, Itachi might be shocked to see how much Sasuke has changed in the future. Maybe Sasuke has developed new powers or a different outlook on life. Itachi could also feel a sense of pride or regret depending on how Sasuke has turned out.
In such a fanfiction, perhaps future Gohan could warn present - day Gohan about upcoming threats that he has faced in his own timeline. He might share his experiences and knowledge, which could make present Gohan a stronger fighter and a wiser person.
In this fanfiction, perhaps Stoick would be amazed by how much Hiccup has grown and changed in the future. He might see all the new inventions and ways of life that Hiccup has brought to Berk. Maybe there would be a moment of pride as he realizes his son has become a great leader.
In this fanfiction, Sasuke might be shocked to see how much Sakura has changed in the future. Maybe she has become a more powerful ninja, or perhaps she has achieved great things in the medical field, which could make Sasuke view her in a whole new light.
They might have a tense encounter. Given their past history in the original story, Merlin could be cautious. Maybe Morgana has changed in the future, but Merlin still has his doubts. He might be on guard, ready to use his magic if needed.
In 'deku meets future deku fanfiction', perhaps the future Deku warns the present one about upcoming threats. He could tell him about villains he'll face in the future and how to defeat them. This would give the present Deku an edge in his battles and also in his growth as a hero.
Well, Sasuke might learn from his future self about his family and how his actions in the future have either helped or hindered the Uchiha legacy. Sakura could discover if she has achieved all her medical and combat goals. It could be a story full of revelations, self - discovery, and perhaps some warnings about the future.