Since it's a fanfiction, 'naruto is the last male' could mean a lot of things. It might be set in a future where something has happened to the male population in the Naruto world. Naruto, being the main character, is then left to deal with the consequences. This could include things like trying to find a way to restore the male population, or dealing with the social and political implications of being the last male. It could also be a story about his personal growth in such a strange and difficult situation, perhaps having to reevaluate his views on gender roles and relationships as he is now in this unique position.
The last male ninja might have a very different role in the village. He could be given special treatment, like being the first choice for all dangerous missions. This is because the village doesn't want to risk losing him as he's the last of his kind. However, this special treatment could also make him a target for enemies who see him as a valuable asset to capture or eliminate.
I'm not sure specifically as there could be many different interpretations of such a fanfiction. It might be about the last male ninja in the Naruto universe, perhaps his final adventure, his relationships, or his role in some kind of end - of - the - world scenario in the Naruto - inspired world of the fanfic.
It might be a character who was thought to be dead but actually survived. For example, someone from the Uchiha clan. He could be the last male and have a vendetta against those who wronged his clan. But as the story progresses, he learns the value of forgiveness and uses his power for the greater good of the ninja world.
Well, it could be that Naruto in this fanfiction has to deal with the fact that he is the last male in a very different way. He might be seen as the key to repopulating the world, which would bring all kinds of moral and ethical dilemmas. Also, the female characters around him would have to re - evaluate their relationships with him. For example, Sakura might feel a greater sense of responsibility to protect Naruto not just as a friend but also because he represents the future of the male population.
Since I haven't read it, I can't say for sure. It could be an original character created specifically for this fanfiction, or it might be a male character from the Naruto series that has been given a new and different role as the 'last male nin'.
Perhaps in this fanfiction, the last male ninja is seen as a sort of anomaly. The ninja world, which was used to a balance of male and female ninjas, now has to adjust. Other ninja might view him with suspicion or even envy. He could be ostracized by some because they fear his power or the fact that he's the last of his kind. This could lead to him having to prove himself constantly, not just in battles but also in his day - to - day interactions with other ninjas.
Obviously, Naruto would be the main character since it's about him being the last male. But other characters like Sakura, Hinata, and Tsunade would also be important. They would play roles in either protecting Naruto or dealing with the situation his existence creates.
Maybe the last male character is an outcast in the village. But as the story unfolds, he finds out that he has a special connection to an ancient prophecy. This connection makes him the key to saving the ninja world from a great darkness that is slowly spreading. He has to overcome his own insecurities and the distrust of his fellow villagers to fulfill his role in the prophecy.
One Naruto - related fanfiction you might like is 'Naruto: The Forbidden Path'. It has some unique twists on the Naruto universe. Another one could be 'Naruto: Reborn in a New World' which also explores different aspects of the Naruto world in a creative way. However, I'm not sure if they are exactly like 'naruto is the last male fanfiction' but they are interesting reads.