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.
The last male character could be on a journey to find the other remaining ninjas who have gone into hiding after a great war. Along the way, he encounters various challenges and makes new allies. He also uncovers secrets about the origin of the war and realizes that he has the power to prevent another one from happening. So, he becomes determined to unite all the ninjas once again to bring peace to the world.
One idea could be that the last male character discovers a hidden jutsu that was lost for centuries. He then has to master it in secret while also dealing with the suspicion of the other villages who think he's up to no good. This would create a lot of tension and action in the story.
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.
I'm not entirely sure as 'lemon' in fanfiction often implies inappropriate content. But if we assume it's a normal fic, perhaps it could be about Naruto being the last male in a world facing some kind of gender - imbalance catastrophe. He might have to take on the responsibility of repopulating the world in a non - vulgar way, like through some kind of genetic research or finding a way to reverse the situation that led to this imbalance.
One possible plot could be that Naruto and Temari team up for a crucial mission to save the ninja world from a new, powerful threat. They start off as reluctant partners but gradually learn to trust and rely on each other, leading to a deep friendship or even a romantic relationship by the end.
Well, it could be about Naruto having to face the loneliness of being the last. Maybe he has to carry on the traditions and values of his village all by himself. He might struggle with the weight of everyone's expectations and also deal with the memories of those he's lost.
Well, it might be about Naruto somehow ending up in the Star Wars universe and being the last Jedi. Maybe he uses his ninja skills combined with Jedi powers to fight against the Sith or some new dark force.
The plot could involve Naruto's journey to understand why he is the last male. He might search for answers across different lands. He could also encounter various challenges related to survival, as without other males, many aspects of society would collapse. He may have to take on roles that were previously divided among many. For example, he might have to learn all the skills necessary for maintaining a community, from farming to building shelters. Along the way, he could also discover some long - lost secrets about his own powers or the world that could help him either reverse the situation or adapt to it.
Well, the plot could be that Naruto is the sole survivor after some kind of apocalyptic event. Maybe all the other shinobi were wiped out by a powerful enemy or a deadly disease. Naruto then has to find a way to rebuild the world while also dealing with his loneliness and the memories of his lost friends.
Perhaps it's a story of their adventures after the events of 'The Last'. They could go on a journey to explore some hidden parts of the ninja world. Along the way, they might encounter old enemies who have new motives or discover new jutsu. Hinata could also be further developing her own skills, and Naruto is there to support her as she grows stronger. Their relationship would deepen during this time as they face different situations together.
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.