I'm not sure specifically what that particular 'the last shinobi naruto fanfic' is about as there could be many different interpretations and stories within fanfics. It might be about the last remaining shinobi in the Naruto universe, perhaps their final battles, or their efforts to preserve the shinobi way in a post - apocalyptic or changed Naruto world.
Well, 'naruto last shinobi fanfiction' could be about a lot of things. It might be a story that focuses on the last remaining shinobi in the Naruto universe. Maybe it shows how they deal with the aftermath of a great war, or perhaps it's about their struggle to preserve the shinobi way in a world that has changed drastically.
There could be new characters as well. The fanfiction might introduce some young shinobi who are the last hope of the shinobi world. These new characters could have unique abilities and backstories, and they might learn from the older, more experienced shinobi. They could be mentored by the likes of Kakashi or Guy.
It could be that all other shinobi have lost their powers due to some sort of dark magic. Naruto, being the last one with his powers intact, has to go on a quest to find the source of this dark magic and stop it. Along the way, he might meet some old friends who have lost their memories of being shinobi and he has to help them remember while also fighting against the dark forces.
You can try looking for it on popular fanfic websites such as Fanfiction.net or Archive of Our Own (AO3). These platforms have a large collection of Naruto fanfics, and you might be able to find 'the last shinobi naruto fanfic' by using the search function and typing in the exact title.
Perhaps it's a shinobi who has retired after a long and eventful career. He could be someone who has seen the darker side of the shinobi world and wants to make sure Naruto doesn't go down the wrong path. He might have been a wandering shinobi who finally settles down with Naruto. For example, he could be a shinobi from a different village who has a unique set of skills to teach Naruto.
In a lot of fanfiction, Naruto becomes the God of Shinobi. This is often because the writers want to create a more fantastical version of the Naruto world. By making Naruto a god - like figure, they can introduce new elements such as different power hierarchies, new types of jutsu that are on a divine level, and unique relationships with other characters. It's a way to expand the already rich Naruto universe in a very different direction. For example, in some fanfictions, Naruto as the God of Shinobi has the power to reshape the world or even rewrite the laws of chakra. This not only gives the story a new and exciting plot but also allows for a deeper exploration of the concepts introduced in the original Naruto series.
Often, in Naruto fanfiction, Naruto himself could be depicted as the 'god of shinobi' in some alternate universe scenarios. Since he has the Nine - Tails' power and has achieved great feats in the original series, it's not a stretch for some fanfiction writers to take his powers to a god - like level.
Well, the shinobi rules in Naruto fanfic can be quite diverse. There's the rule of secrecy regarding jutsu. Shinobi are not supposed to freely share their unique and powerful jutsu with outsiders or enemies. Then there's the code of honor in combat. They should fight fairly, not use underhanded tactics like attacking an unarmed opponent. And of course, they are required to respect the hierarchy within the village's shinobi system.