One possible plot could be Elrond traveling to different eras in America. He might end up in the colonial era and witness the struggles of the early settlers. Maybe he uses his elven knowledge to help them with things like medicine or building more efficient shelters.
Well, it could also be that Elrond travels to the future of America. He'd be amazed by the advanced technology. He might get involved in some sort of conflict where his elven wisdom is needed to resolve a problem between different factions fighting over new resources or power.
He could meet Native American tribes. Elrond would be intrigued by their unique cultures and spiritual beliefs. He might exchange knowledge with them, like sharing elven tales in return for learning about their hunting techniques.
If Elrond travels back to the First Age, he could meet Fëanor. This would be a very interesting encounter as Fëanor was a great and complex figure. Their meeting could lead to a clash of ideas, as Fëanor was often headstrong and Elrond is known for his calm wisdom.
One idea could be that Elrond travels back in time to the First Age to prevent a great tragedy. He uses his knowledge and wisdom from the Third Age to change the course of events. Maybe he stops a powerful weapon from being created that would later cause destruction.
Well, one possibility could be that Naruto has some of Elrond's elven abilities like enhanced senses and longevity. Maybe he uses his Naruto - style ninjutsu along with elven magic to fight against a common enemy that threatens both the ninja world and Middle - earth. He could also have some internal conflict as he tries to reconcile his ninja way with the more refined and noble elven culture.
The plot might start with Elrond being summoned by some mysterious force that leads him to Maedhros and Maglor. Maedhros could be in a state of constant pain due to his past actions and the loss of the Silmaril. Maglor, on the other hand, is full of regret. Elrond, with his empathetic nature, tries to comfort them. As a result, they start to see Elrond not just as someone they once knew as a child but as an equal. They might then start to share their long - held secrets, and Elrond might use this knowledge to further his own goals in Middle - earth, like promoting peace or understanding between different races.
Maybe Elrond takes Harry in because he senses great power in him. He then raises Harry in a world full of magic and elves, teaching him skills that are different from what he would learn at Hogwarts.
In a possible plot for such fanfiction, perhaps a magical artifact or spell gone wrong results in Bilbo's pregnancy. Elrond, with his knowledge of magic and lore, tries to find a way to reverse it at first. But as time passes, he starts to form a bond with Bilbo and the unborn. The plot might involve them hiding from those who would not understand or accept this situation, and also their journey to find a place where they can be safe and raise the child if they choose to keep it. This would be a very complex and unique story considering their different natures in the original works.
Another idea is that they travel to a time just after the end of the First Wizarding War. There is chaos and rebuilding going on. Harry and Teddy could be on a mission to retrieve a powerful magical artifact that was lost during the war. Along the way, they meet survivors of the war and learn about the true cost of the conflict. Teddy, who has grown up in a post - Voldemort world, is deeply affected by the stories of those who lived through the dark times.
One possible plot could be that Boruto and his friends travel back in time to the era of the original Naruto series. They might meet the younger versions of their parents and other iconic characters. This could lead to some comical situations, like Boruto trying to teach his young father some new jutsu techniques he learned in the future, not realizing it might disrupt the timeline.
One possible plot could be that Natsu and Erza are sent back in time to a crucial moment in the history of their guild. Maybe they go back to the time when the guild was first founded. They could end up having to protect the founders from a threat that was long forgotten in their own time. This would give them a chance to see how the guild started and also change some things for the better in the present.