Perhaps in the fanfiction, we can see how the Hidden Leaf Village has evolved. Maybe new alliances have been formed with other villages, and Naruto has to deal with the political aspects of these new relationships. Also, we could explore the lives of the characters who didn't get as much spotlight in the original series, like Shikamaru as a strategic advisor in a more complex world situation.
One idea could be focusing on the next generation of ninjas. For example, showing how Naruto's son, Boruto, discovers a new and dangerous threat that the older generation had overlooked. Another could be exploring the relationships that have changed over time, like Sasuke and Sakura's marriage and how they are raising their daughter.
A great concept for a Naruto epilogue fanfiction could be about the revival of an old and forgotten ninja art. A young ninja stumbles upon it and it causes a stir in the ninja world. Naruto and his friends then have to decide whether to embrace it or suppress it, while also dealing with the power - hungry individuals who want to use it for their own gain.
A cool concept for a Mockingjay Epilogue fanfiction could be to tell the story from a different character's perspective. For instance, Gale's. He could be reflecting on his life after leaving District 12 and his feelings about Katniss and Peeta's relationship. Or you could write about the new generation of kids in Panem who are only hearing stories about the Hunger Games and how they view the world their parents fought to change.
One idea could be focusing on the long - term psychological effects on the survivors. For example, Katniss might struggle with post - traumatic stress disorder and how she copes with it in her new life. Another could be about the rebuilding of the districts and how the relationships between the districts have changed. Maybe there are new alliances or rivalries emerging as they try to create a more equal society.
In an 'Epilogue Harry Potter fanfiction', you might consider a story where Harry Potter discovers a long - hidden secret about Hogwarts that was overlooked during his time as a student. This could lead to a new adventure with his friends. You could also explore the idea of the magical creatures in the wizarding world becoming more involved in the human - wizard relations. For instance, the centaurs sharing their ancient wisdom with the wizards. Additionally, a fanfiction could be centered around the Muggle - born wizards and witches helping to bridge the gap between the Muggle and wizarding worlds even more.
One interesting idea could be exploring the further adventures of the next generation at Hogwarts. Maybe they discover a long - lost magic that was forgotten. Another idea might be delving deeper into the relationships that were just hinted at in the original epilogue, like how Albus Severus Potter really gets along with his Slytherin friends.
One idea could be exploring the backstories of the minor characters. For example, the tributes from the districts who didn't get much spotlight in the original story. Maybe tell the story of how they trained before the Games, their hopes and fears.
A great plot idea would be to have a time - travel aspect. Some young wizard or witch accidentally goes back in time to the days just after the final battle. They see how the wizarding world was rebuilding and learn valuable lessons from the past. Meanwhile, the present - day characters notice strange things happening and start to investigate. This could lead to a whole new adventure that involves both the past and present of the Harry Potter universe.
Some fanfics might focus on the idea of time - travel within the 'harry potter' universe in the context of the epilogue. Imagine if one of the next - generation characters accidentally travels back in time and meets the younger versions of their parents. This could lead to all sorts of comical and heart - warming moments. It could also explore how this time - travel affects the future and whether they are able to return to their own time without causing any major disruptions to the timeline.
One interesting idea could be the combination of Naruto's ninja skills with mecha technology. For example, Naruto might use his chakra to power up the mecha in unique ways. Another idea could be the new enemies that are created specifically for this mecha - Naruto concept, like robotic shinobi that require different combat strategies compared to normal foes. Also, the design of the mecha Naruto itself can be really cool, perhaps with features inspired by the Nine - Tails.
Another idea is that Aizen somehow ends up in the Naruto universe during the time of the Fourth Great Ninja War. He could try to manipulate both sides for his own gain. But Naruto, with his ability to see the good in people, might try to reason with Aizen and show him a different path. It could be a story of redemption or a great battle if Aizen refuses.
In a 'Naruto Mermaid Fanfiction', the mermaids could be in danger from an evil organization that wants to capture them for their precious scales. Naruto teams up with a mermaid princess to stop this threat and in the process, they learn about each other's worlds.