A powerful demon could be the main antagonist. This demon senses the power of the Yoru sword and wants to possess it. It starts causing chaos in the ninja world, and Naruto has to face this demon with the help of the sword. The demon could have some special abilities that make it difficult for Naruto to fight, like the ability to manipulate shadows or create illusions that are even stronger than normal ninja illusions.
One idea could be that Yoru's sword has a hidden power that only Naruto can unlock. Maybe it's a power related to an ancient ninja art that was lost. Another idea is that the sword has a spirit that can communicate with Naruto and guide him in his battles. For example, the spirit could give Naruto advice on how to defeat stronger opponents. Also, the sword could be a key to a secret realm filled with powerful ninja tools and techniques that Naruto needs to master.
The unique setting of Kokuto Yoru makes it interesting. It's a chance to see Naruto in a different environment, which can bring out new aspects of his character.
One popular 'naruto kokuto yoru fanfic' might be 'The Adventure of Naruto and Kokuto at Yoru'. It often features unique adventures and character developments. Another could be 'Naruto's Encounter in Kokuto Yoru' which focuses on Naruto's experiences in that special setting.
Well, you could write a fanfic that focuses on the friendship between the characters in 'arashi no yoru ni'. Maybe there are some untold adventures they had together before the events of the main story. You could also introduce new characters that interact with the existing ones in unique ways, adding new dynamics to the story.
First, re - watch or re - read the original 'arashi no yoru ni' to get a fresh feel for the story, characters, and the overall atmosphere. Then, come up with a simple concept, like a new adventure for the characters or a different perspective on an existing event.
He could find it during one of his missions. Maybe he's exploring an ancient ruin and stumbles upon the sword. It could be in a hidden chamber protected by some traps that Naruto has to overcome using his skills and wits.
One possible scenario in this fanfic could be that Naruto finds a magical sword. The sword might have special powers like being able to cut through any material or even having the ability to nullify jutsu. Naruto, being Naruto, would initially be confused about how to use it but would soon start to experiment. He might try to incorporate it into his combat style, perhaps using it in combination with his shadow clones to create some really cool and unexpected attacks.
A 'Naruto Sword of the Thunder God Fanfic' might explore new adventures centered around the Sword of the Thunder God in the Naruto universe. It could involve characters like Naruto using this powerful weapon in unique ways, perhaps against new enemies or in unforeseen situations.