One possible storyline could be that his older sister was sent away on a secret mission when Naruto was young. Years later, she returns, having gained great power and knowledge. She then helps Naruto in his journey to become Hokage, teaching him advanced jutsu and giving him emotional support during tough times.
In a fanfiction, his older sister could be a medical ninja with extraordinary skills. She secretly takes care of Naruto whenever he gets injured in his battles. She also uses her influence in the medical ninja community to gather information about the Akatsuki, which helps Naruto and his friends in their fight against this dangerous organization.
One possible storyline could be that Naruto's sister is also a ninja. She might be secretly trained by someone in the village, like an old hermit. And she could be very powerful, having a unique jutsu that even Naruto is amazed by. Maybe she has to hide her identity at first to protect Naruto from some unknown threats in the ninja world.
Another storyline could involve the sister being in a different magical school all this time. When she discovers Harry's situation, she transfers to Hogwarts. She then tries to fit into the Hogwarts environment while also trying to figure out how to use her knowledge from her previous school to aid Harry. She might bring new ideas about magic that are different from what they teach at Hogwarts.
One possible storyline could be that James Potter's little sister is a bit of an outcast in the wizarding world because she doesn't have the same brash and popular personality as James. Maybe she's more into books and research. She could struggle to find her place among the Gryffindors who idolize her brother. Another could be that she has a special power that she's afraid to show because she doesn't want to be compared to James all the time. And she might form an unlikely friendship with someone from a different house, like a Ravenclaw, who helps her explore her own identity away from her brother's shadow.
One possible plotline could be that the older brother was thought to be dead but actually survived and returns to protect Naruto from the shadows. He might have some special powers or knowledge that he uses to keep Naruto safe without revealing his identity at first.
The story could also involve Naruto's Pokemon bloodline being the key to solving a great mystery in the ninja world. His newfound abilities might attract the attention of both friends and foes. Some might see it as a great power to be harnessed, while others might fear it. Naruto would then have to navigate through this new situation, trying to understand his powers and use them for the good of his village, all while dealing with the politics and rivalries that come with having such a unique bloodline.
One possible storyline could be that Naruto's new 'four eyes' are a result of some strange jutsu gone wrong. Maybe he was trying to enhance his perception skills and ended up with an extra pair of eyes. These eyes could give him unique abilities, like seeing different types of chakra more clearly or even predicting an opponent's moves better. He might struggle at first to control this new change and it could be a source of both humor and growth in the story.
If Ruby is the older sister in RWBY fanfiction, there could be a storyline where she has to deal with the family secrets that were passed down to her as the eldest. Maybe she discovers something about their family's past that she has to protect her siblings from. Another possibility is that she has to balance her duties as a sister with her role as a huntress - in - training. She might have to sacrifice some of her own training time to look after her siblings, which could lead to internal conflicts and character growth.
One possible storyline could be that Naruto receives Kakashi's Sharingan through some sort of magical or experimental transfer. This new power could make Naruto even more formidable in battle. He might start to see the world in a different way, with the Sharingan's abilities to copy jutsu and predict movements. This could lead to new training regimens as he tries to master the Sharingan's full potential while still relying on his own Uzumaki powers like the Nine - Tails chakra.
One possible storyline could be that Naruto wears glasses as a disguise while on a secret mission. He might be infiltrating an enemy organization where his usual look is well - known, so the glasses help him blend in. Maybe he also uses them to give off a more studious or intellectual appearance to gain the trust of certain targets.
One possible storyline could be that Naruto is born with red hair due to some sort of genetic mutation or a hidden family trait. This could lead to him being ostracized in the village at first as he looks different from the norm. But then he uses this unique feature to his advantage, perhaps by standing out more in combat or in his ninja training, as his red hair makes him more recognizable and intimidating.