Well, in some fanfictions, Naruto might obtain the Sword of Tengu through a quest. Maybe he has to help a spirit or an ancient being in return for the sword.
One idea could be that the Sword of Tengu has a hidden power that only the protagonist can unlock. This power could be related to an ancient jutsu that was sealed within the sword long ago. Another idea is that the sword has a spirit that communicates with the wielder, guiding them in their battles and adventures in the Naruto world.
Naruto himself could be a great main character. Imagine Naruto finding the Sword of Tengu during one of his adventures. He could struggle at first to understand the sword's power, but with his determination, he would eventually master it and use it to protect the village in a new and exciting way.
The theme of mystery also runs through 'naruto tengu fanfic'. The tengu itself is often a mysterious creature in these fanfics. Writers use this to create an air of intrigue, like the origin of the tengu, what their true motives are, and how they fit into the existing Naruto lore. This mystery keeps readers hooked as they try to uncover the secrets along with the characters.
Well, in some fanfictions, Naruto might obtain the overpowered sword through a mysterious inheritance. Maybe it was left by a powerful ninja from the past and Naruto discovers it in a hidden cave or something.
Well, in some fanfictions, Naruto might obtain the Master Sword through a strange portal that connects his world to the world where the Master Sword exists. Maybe he's on a mission and stumbles upon it by accident.
In some fanfictions, Naruto might obtain the dragon sword through a special quest. Maybe he stumbles upon an ancient temple during one of his missions where the sword is hidden as a powerful artifact, guarded by some kind of magic or traps. He overcomes these obstacles using his ninja skills and determination, and thus gets the dragon sword.
I really like 'Tengu's Aid to Team 7'. In this fanfic, a tengu becomes an ally to Naruto, Sasuke, and Sakura. It has a lot of action scenes where the tengu uses its unique abilities to help the team in their missions. The character development in this fanfic is also quite good. The tengu's presence forces the members of Team 7 to reevaluate their own skills and teamwork. It's a great read for any Naruto fanfic lover.
Maybe it has the ability to absorb chakra. So when Naruto is in a fight against an opponent with a large amount of chakra, he can use the sword to drain some of that chakra, weakening the enemy while strengthening himself. The sword could then store that chakra for later use, like to boost Naruto's own attacks.