Perhaps a plot where an old enemy resurfaces in a new form, and the new generation has to figure out their weaknesses. This could lead to intense battles and character development as they struggle to adapt to this new threat.
One idea could be exploring a character's backstory that was not fully developed in the original. For example, if there's a side character in 'a new dawn', the fanfiction could delve deep into their past, like their family life or how they came to be in the setting of the story.
In this fanfiction, a really interesting plot might be the emergence of a powerful energy source near a stargate. This energy source attracts various factions, both friendly and hostile. The main characters then have to protect it from falling into the wrong hands, while also trying to understand its true nature. They might face internal conflicts within their own group as different members have different ideas on how to handle this new discovery. And there could be a race against time as the hostile forces are getting closer and closer to seizing the energy source.
One idea could be exploring the backstory of a minor character in A New Dawn. For example, a young mechanic who ends up helping the main characters in a crucial way. Another could be a story set in a different part of the galaxy during the events of A New Dawn, showing how those events are affecting other worlds. Maybe a planet is facing a food shortage because of trade disruptions caused by the main conflict.
One idea could be that Naruto and his friends are transported to the world of Until Dawn. Naruto's ninja skills would be put to the test against the horror elements of Until Dawn. Maybe he has to use his shadow clones to outwit the monsters in the dark. Another plot could involve the Until Dawn characters learning ninjutsu from Naruto.
In 'Dawn of Darkness Fanfiction', a cool plot could be a time - travel plot. A character accidentally travels back in time to a crucial moment in the history of the 'Dawn of Darkness' world. They then have to figure out how to get back to their own time while also making sure they don't accidentally change the future for the worse. Another idea is a story that focuses on the magic system in the 'Dawn of Darkness' world. Maybe a character discovers a new way to use magic that was previously thought impossible and has to deal with the consequences, both good and bad.
You could also create an alternate timeline for the 'a new dawn' story. Maybe in this new timeline, a key decision was made differently, and it completely changes the course of events. This would allow for a lot of creative freedom in exploring new relationships and plot developments.
One idea could be the new Sannin facing a powerful new enemy that threatens the entire ninja world. They have to combine their unique skills, like one being a master of genjutsu, another of taijutsu, and the last of ninjutsu, to overcome it.
One idea could be a new clan that has the ability to control time in a limited way. For example, they can slow down time for a short period during battles, which gives them an edge. Another idea is a clan that has a special connection with animals, not like the Inuzuka clan, but they can communicate telepathically with all kinds of animals and use their skills in combat or for gathering information. A third idea could be a clan that has mastered a form of chakra that can create illusions so powerful that they seem real even to the Sharingan or Byakugan users.
One idea could be a story about a new type of chakra that is discovered in the new village. This chakra has unique powers that no one has ever seen before. The main character could be a young ninja who is the first to master it, leading to a series of adventures where they have to protect this new power from those who would misuse it.
Maybe Naruto's new hair is the result of a cross - dimensional encounter. He accidentally travels to a parallel world where all the characters have different hair styles. When he returns to his own world, his hair has changed to a style that combines elements from both worlds. This new hair then becomes a link between the two dimensions, and he has to use it to prevent a threat that is spreading across both universes.