Perhaps a plot where Naruto's feminine body is the result of a curse or a powerful jutsu gone wrong. He then has to go on a quest to find a way to reverse it. Along the way, he meets other characters who have also experienced body - changing situations. They share their experiences and knowledge with him. This could lead to Naruto learning more about the nature of the body and chakra, and also about self - acceptance, as he starts to appreciate his new form even while trying to change it back.
One possible plotline could be Naruto using his new feminine appearance to go undercover in a place where only women are allowed. For example, he might be trying to gather information in a female - only ninja academy to prevent an upcoming attack. Another plot could involve Naruto's friends' reactions. Some might be shocked at first, but then quickly accept him and even joke about how he can now understand the struggles of being a woman in the ninja world, like dealing with certain types of clothing or social expectations.
A plotline could revolve around Naruto's new form affecting his ninja abilities. Since his body is different, he might discover new ways of using chakra or performing jutsus. For instance, he could find that his chakra flow is more in tune with certain types of water - based jutsus that are typically more associated with female ninjas. Also, there could be a story where Naruto has to deal with unwanted attention from male characters who are attracted to his new feminine look, and he has to figure out how to handle it while still focusing on his ninja duties.
Maybe the horns are a sign of a new power awakening within Naruto. He could initially be afraid of them and hide them, but as he discovers their potential, he learns to embrace this new aspect of himself and use it to protect the village in ways he couldn't before.
One possible plotline could be that Naruto, in his feminine form, is attending a formal shinobi event and has to choose an appropriate and stylish outfit to wear, which could lead to some comical or interesting interactions with other characters.
In a fanfic, Naruto could inherit the Sharingan from a long - lost relative. This relative could be an Uchiha who fell in love with an Uzumaki long ago. With the Sharingan, Naruto gains the ability to predict his opponents' moves more accurately. He uses this new power in combination with his Rasengan to create new and powerful jutsus, and he also has to figure out how to control the Sharingan's curse, which comes with its own set of challenges.
One possible plotline could be that Naruto's sister is overly protective of him. She might get jealous when Naruto spends time with his friends, especially female friends. For example, when Naruto goes on a mission with Sakura, his sister could be sulking at home, worried that Sakura might take Naruto away from her in some way.
In a fanfic where Naruto has to go through puberty again, the story could focus on his social life. Naruto was always an outcast as a child, but now with puberty, he might have a chance to reinvent himself. He could become more popular among his peers, but also face new rivalries. For instance, some of the other boys in the village might be jealous of his newfound confidence or the attention he gets from the girls. This could lead to some interesting battles and competitions, not just physical ones but also in terms of popularity and respect within the village.
A possible plotline could be that Naruto's mother returns from the dead in some way. This could create a huge stir in the ninja world. Naruto would have to deal with his new - found family situation while also facing the challenges that come with it. There could be enemies who target his mother because of her connection to Naruto or some secrets she holds. And Naruto would have to learn to balance his relationship with his mother and his duties as a ninja.
One possible plotline could be that Naruto's brother has been living in secret all this time. Maybe he was sent away for his own safety when they were young. He could return to the village and at first Naruto is suspicious, but as they get to know each other, they form a strong bond and fight together against the common enemies of the village.
One interesting plotline could be Naruto struggling to control the power of the curse mark. It might lead him to make some unexpected decisions. For example, he could be tempted to use the dark power in the curse mark to defeat a powerful enemy quickly, but at the risk of losing himself to the darkness. Another plotline could involve Naruto trying to find a way to remove the curse mark without anyone's help, showing his independent and determined side. Maybe he goes on a journey to find a rare herb or a hidden technique that can get rid of it.
One possible plotline could be that Sakura is a popular girl in her village or school. Each boyfriend represents a different aspect of her life. For example, one might be a childhood friend who has always loved her, another could be a new guy who she meets during a mission and is attracted to because of his bravery. As the story progresses, she has to figure out her true feelings among all these relationships.
Maybe Naruto is affected by a dark and ancient curse. This curse was placed on him by an unknown enemy. It starts to take hold gradually, making him weak and sick. He begins to have strange visions and nightmares. His body slowly deteriorates, and he loses his appetite. His friends notice his strange behavior and the physical changes, but Naruto is determined to keep fighting until they find out what's wrong with him.