Well, it could be about Samehada being overlooked in the Naruto universe. Maybe it's not being used to its full potential. For example, it might be that no one realizes its unique abilities aside from just being a weapon. Or perhaps it's being misused or underutilized by its owners.
In a 'naruto neglected samehada fanfiction', the plot could revolve around Samehada feeling left out. Since it has a sort of sentience. It could start to act out in ways that are unexpected. It might try to find a new master who will actually appreciate it. And this could lead to all sorts of adventures and interactions with different characters in the Naruto world.
It could be Samehada itself. Since the story is about it being neglected, it makes sense for it to be the main focus. It could have its own 'voice' and thoughts as it tries to deal with the situation.
One possible plot could be that Naruto somehow gets bonded with Samehada. Maybe during a battle in an alternate dimension where the laws of chakra and weapons are all jumbled. Naruto starts to learn how to use Samehada's unique abilities, like absorbing chakra not just to power himself but also to heal. This causes a stir among the ninja world as they see Naruto with this new and somewhat menacing power - the power to drain their chakra with ease. His friends are initially cautious but then come to realize that Naruto is still the same person inside and they work together to master this new form of power.
The plot might be that an enemy steals Samehada and Naruto has to get it back. Along the way, he discovers that Samehada has a connection to an ancient and powerful clan. Naruto teams up with some members of this clan who want to reclaim Samehada as well. They face many challenges together, and Naruto uses his own skills and the power of Samehada to defeat the enemy. In the end, Naruto decides what to do with Samehada, whether to keep it or return it to the clan, depending on the bond he has formed with it.
The plot could involve Naruto using Samehada to gain an understanding of the Akatsuki's motives. Since Samehada has a connection to the Akatsuki through Kisame, it might hold some secrets. Naruto could use it to track down other Akatsuki members or find out more about their plans.
In 'naruto neglected kiri fanfiction', the plot might center around the internal problems of Kiri that are a result of being neglected. There could be a power struggle within the village as resources become scarce because of the lack of external support. Some clans within Kiri might be on the verge of disappearing due to this neglect. And a group of brave Kiri ninjas, led by a strong protagonist, could be trying to find ways to reverse this situation and make Kiri relevant again in the Naruto world.
Maybe in the fanfiction, Naruto neglected Kumo because he was too focused on his own village's problems. But then something major happens in Kumo, like a powerful enemy targets them. Naruto realizes his mistake and goes to Kumo to make amends. He teams up with the Kumo shinobi, and they work together to fend off the threat. Along the way, he learns about Kumo's unique culture and forms strong bonds with their ninja.
One possible plot could be that in a crossover world, the Yugioh characters are somehow transported to the Naruto universe. However, the Naruto characters neglect them, thinking they are just strange intruders. The Yugioh characters then have to find a way to get back home while dealing with the indifference of the Naruto world.
Well, it could be about a jailer in the Naruto universe who is constantly overlooked and underestimated. Maybe he has some unique skills or knowledge that no one pays attention to. And as the story unfolds, he starts to prove his worth in unexpected ways, perhaps by saving the village from a hidden threat that the regular shinobi missed.
In this type of fanfiction, it could be that Naruto enters the Sekirei world during one of his training missions gone wrong. He is neglected by the Ashikabi (the Sekirei masters) at first because he doesn't seem to have any Sekirei - like powers. However, Naruto's strong will and determination attract a Sekirei who is also different from the others. They start to train together, Naruto teaching the Sekirei about ninja values like loyalty and perseverance. As they progress, they start to change the perception of what it means to be strong in the Sekirei world, and Naruto becomes an important figure despite the initial neglect.
Well, it could be about a sword that has some sort of hidden power. Maybe it was once used by a great shinobi in the Naruto world but has been forgotten over time. The story might follow a character who discovers the sword and tries to unlock its potential while everyone else in the Naruto universe is neglecting it.