Well, it could be a story where the ninjas from Naruto learn about bending in the Avatar world. They might be initially confused but then start to adapt. Naruto himself could try to learn airbending, given his fast - moving and free - spirited nature. And there could be a conflict where the shinobi way and the bender's philosophy clash, leading to interesting character developments.
Another possibility for main characters could be Kakashi from Naruto and Toph from Avatar. Kakashi's wisdom and experience as a ninja could be valuable in the Avatar world. Toph, on the other hand, with her unique earthbending skills and no - nonsense attitude, could offer a different perspective. They could form an unlikely duo, with Kakashi learning about earthbending from Toph and Toph being intrigued by Kakashi's Sharingan and ninjutsu techniques.
Perhaps it was a weapon created by a rogue ninja with unique powers. And for some reason, it found its way to Naruto in Wave. It might also be a weapon that was enchanted by a sorcerer long ago and has special abilities that Naruto will discover as he uses it.
On the positive side, new and better policies could be implemented. If the old council was corrupt or stagnant, getting rid of them would open the door for fresh ideas and reforms. Naruto could bring in new people with different perspectives to help run the village, leading to a more prosperous and fair Konoha.
His teammates, Sasuke and Sakura, would surely be involved. Sasuke, although he may not show it as much, still cares about Naruto. He would keep an eye on Naruto's condition, and if there was any sign of danger, he would be ready to protect him. Sakura would be more hands - on with the medical care, checking his temperature, giving him medicine, and making sure he rests properly.
One possible scenario in this fanfiction could be that Naruto's sister constantly interferes in his ninja training. She might think the training is too dangerous for him and tries to stop him from taking on challenging missions. For example, when Naruto is about to go on a mission to the Land of Waves, his sister could try to convince the Hokage not to send him, believing that he's not ready yet. This would add a whole new layer of conflict to the story, not just between Naruto and his sister, but also with the village's expectations of Naruto as a ninja.
A fanfiction about Naruto getting the Kusanagi could also involve a time - travel aspect. Naruto could be sent back in time and end up in the era when the Kusanagi was first created. There, he meets the original wielder and learns from them. He then brings the knowledge and the sword back to his own time, using it to defeat a great evil that was previously unbeatable.
In a Naruto fanfiction where he gets a massage, it could be a really interesting scenario. Maybe he's injured from a tough battle and the massage is part of his recovery. It could also be a way for him to relax after all the stress of being a ninja. This kind of fanfiction might explore his reaction to the gentle touch and care during the massage.
One idea could be that Naruto discovers the tanto in an ancient shinobi relic site. He initially doesn't know how to use it but with the help of Kakashi, he starts to learn. The tanto could have some special powers, like being able to cut through chakra - based defenses. This would add a new dimension to Naruto's fighting style.