One interesting fanfiction could be where the flak jacket becomes a key element in a time - travel story. Maybe Naruto's flak jacket gets sent back in time and changes the course of history in the Naruto universe.
In some fanfictions, the flak jacket could be a symbol of a bond. Say, it was given to Naruto by a beloved mentor who passed away. And throughout the story, Naruto has to protect the flak jacket and what it represents during various battles and challenges.
A good one could be 'The Flak Jacket's Legacy'. In this fanfiction, the flak jacket is passed down through generations of ninjas and Naruto discovers secrets about the previous owners that help him in his own journey.
There might be a fanfiction where the necklace is a symbol of a pact. Naruto's necklace could be part of a pact made by his parents with a powerful being. As Naruto grows and faces challenges, the being watches over him, and the necklace serves as a connection. When Naruto reaches a certain level of strength or understanding, the pact is fully revealed.
A really cool fanfiction idea is that Naruto is sent back in time. He can use his knowledge from the future to change things for the better. He might be able to prevent some of the tragedies that happened in the original story, like the Uchiha massacre, which would completely change the course of the Naruto universe.
One interesting Naruto fanfiction could be where Smart Naruto uses his intelligence to quickly learn and master new jutsus that others take years to understand. He might use his smarts to outwit his enemies in battles, coming up with strategies that no one expects.
One interesting fanfiction could be where Sakura's skirt gets caught in a tree branch during a mission, and Naruto has to help her out in a really comical way. For example, he tries to use his shadow clone jutsu to hold her up while she unhooks it, but things go hilariously wrong.
One interesting Naruto village fanfiction could be about a new, powerful ninja emerging from the village. This ninja might have a unique power that no one has seen before, and they go on adventures to protect the village from unknown threats. For example, they could discover a hidden conspiracy within the village leadership that endangers all the villagers.
One interesting fanfiction could be one where the Animaniacs characters end up in the Naruto universe. They might use their wacky antics to disrupt the shinobi world in a humorous way. For example, Yakko, Wakko, and Dot could accidentally interfere with a ninja training session, leading to chaos but also some unexpected lessons for the young ninjas.
In some fanfictions, Sasuke might have a scar that has a deep backstory related to his time away from Konoha. For example, a scar he got while on his journey with Orochimaru could symbolize his internal struggle between the power he sought and the loyalty he once had. It could be explored in the fanfiction how this scar affects his relationships when he returns to the village.
There are many great Naruto Shippuden fanfictions. Some focus on exploring the backstories of minor characters, like the story of how Rock Lee trained even harder during the time skip in Shippuden. Another type might be ones that re - imagine the battles, giving different strategies and outcomes. For example, a fanfiction could show what would have happened if Sasuke didn't leave the village in a different way.
Some 'Naruto' fanfictions are really cool. For instance, the ones that give Naruto new powers. Maybe he gets a power related to space - time manipulation that he has to learn to control. This can lead to really exciting adventures and battles. Also, fanfictions that rewrite the whole story from an alternate point of view, like from the view of the Akatsuki members, can be very interesting as it shows a different side of the 'Naruto' universe.