One idea could be a story where Naruto teaches the shuriken shadow clone jutsu to a new generation of ninja in a post - war Konoha. They then use it in a friendly competition to see who can create the most effective and creative use of the jutsu.
First, you need to understand the jutsu well. Research how it works in the Naruto universe, including its limitations and potential. For example, how many shurikens can a clone realistically throw? Then, create an interesting plot. It could revolve around a mystery related to the jutsu, like why it suddenly starts behaving differently for Naruto. Keep the characters true to their personalities. If Naruto is in your story, he should be brave and impulsive as we know him.
There could be a jutsu that allows for instant teleportation across long distances. This jutsu might be a new discovery in the fanfiction world, perhaps created by a character who has been experimenting with space - time ninjutsu. They might use it to quickly get in and out of battles or reach far - off places in a blink.
Maybe Sasuke. Although they are rivals, they also have a deep bond. Sasuke might have come across a unique jutsu during his travels and decide to teach it to Naruto so that they can both become stronger and better protect their village.
He might learn a time - traveling jutsu. This would be really cool as it could allow him to go back and change certain events in the Naruto world, or gain knowledge from the past to use in the present battles.
One interesting Naruto Demon Wind Shuriken fanfiction is 'The Power of the Demon Wind Shuriken'. In this story, the author delves deeper into the origin of the Demon Wind Shuriken. It shows how Naruto discovers an ancient scroll that reveals secrets about the shuriken's creation and its hidden powers. The story has great action scenes where Naruto uses the enhanced knowledge of the shuriken to fight powerful enemies. It also explores Naruto's growth as a ninja as he masters new techniques related to the Demon Wind Shuriken.
It could be a rogue ninja who has developed a counter - technique to the Rasen Shuriken. He aims to use this to defeat Naruto and prove himself as the strongest. This antagonist might have a personal vendetta against Naruto or simply be power - hungry.
A 'Solar - Flare Rasengan'. Naruto could combine his wind - style chakra with some kind of solar - based energy he discovers. This jutsu would be like a super - charged Rasengan that emits a blinding light as well as powerful wind - based damage.
He could potentially learn the Flying Thunder God Technique. It's a very powerful jutsu that Minato was famous for. Naruto's already fast with his Sage Mode and Nine - Tails Chakra, and this would make him even more formidable in battle.
He could practice in secret locations where no one can see him. For example, in an abandoned cave or a hidden part of the forest. That way, no one will know about the new jutsu he's developing.