One interesting plotline could be Naruto developing new and unique jutsus in the shadows. For example, he might secretly master a jutsu that combines different elements in a way no one has seen before.
A possible plotline is Naruto being trained by a mysterious figure in the shadows. This figure could be an ancient ninja who has been in hiding for centuries. Under this training, Naruto not only becomes stronger physically but also gains a deeper understanding of the ninja way, which is different from what he has been taught in the village. This new knowledge could put him at odds with some of the traditionalists in the village while also making him a more formidable ninja.
One interesting plotline could be Naruto delving deeper into shadow-based jutsu and uncovering ancient secrets related to it. Maybe he meets a shadow spirit that teaches him unique techniques.
Perhaps a story where a group of rebels find themselves in a region filled with unnatural darkness that seems to sap their strength. They must overcome this and also deal with Imperial forces that are using the situation to their advantage. In this fanfiction, it could show how they use their wits and the Force to survive and fight back. This would add a new layer of danger and mystery to the Star Wars universe we know.
One interesting concept could be exploring new shadow - based jutsu that the characters develop. For example, a fanfiction might introduce a jutsu where a character can create multiple shadow clones that are made entirely of shadows, with different properties from the regular shadow clones. This could add a new layer of strategy in battles.
Well, one interesting concept could be the combination of shadow jutsu and ice techniques. Maybe the characters use shadows to manipulate ice in unique ways, like creating ice sculptures with shadow puppetry. Another concept might be the exploration of how characters with shadow and ice abilities interact within the Naruto universe's power dynamics.
One interesting plot could be about the characters exploring a hidden realm within their minds. Maybe Naruto discovers a long - forgotten power there.
One interesting plotline could be the exploration of the shadows' origin. Maybe they are a result of a long - forgotten magical experiment in the Chrono Trigger universe. Another could be the relationship between the main characters and the shadows, like how they learn to coexist or fight against them.
One idea could be a story where the characters from Naruto are transported to a different dimension within the League of Shadows' realm and have to fight new and unknown enemies. They could form unexpected alliances with some of the League of Shadows' members who have a change of heart.
One interesting plotline could be the mystery behind the mask. Maybe it has some special power that only Naruto can unlock or it could be related to an ancient prophecy. Another could be a new villain who uses the mask to create chaos in the ninja world and Naruto has to stop him.
Perhaps Naruto discovers a new medical jutsu that combines his chakra control with traditional medical knowledge. This could revolutionize the medical field in the Naruto universe. He might use it to heal previously incurable diseases or injuries, and in the process, gain the respect of the medical community. This could also lead to some interesting interactions with other medical ninja, like Shizune or Tsunade.
Well, in some fanfics, there's a plotline where Hinata loses her memory and Naruto has to make her fall in love with him all over again. It's a classic but still very engaging. There are also stories where they are arranged to be married for political reasons at first, but then they actually fall in love for real during the process. And a really unique one is when Hinata becomes a super powerful ninja overnight and Naruto has to deal with his feelings of being a bit overshadowed while also being proud of her.