The relationships could be complex. One sister could be the serious and strict one, always pushing Naruto to be better in his studies and ninja training. Another sister might be more easy - going and act as a confidant for Naruto, listening to his problems. And the third sister could be the baby of the family, and Naruto feels very protective of her in return.
Well, their relationships could be shown in various ways. Maybe the sisters are very protective of Naruto. They could be older sisters who constantly look out for him, like warning him about the dangerous ninja world. They might also be training partners, helping Naruto to improve his skills.
In some fanfictions, Naruto might start off with a rocky relationship with Kumo shinobi. They could be suspicious of him because of his status as a Konoha ninja. But as time goes on, he wins them over with his determination and kind heart. For example, he could befriend a young Kumo ninja who is initially afraid of him but then sees how he's always willing to help.
Often, in such fanfictions, the relationships can be really out of character. Naruto might be made overly possessive of Sasuke, and Sakura might be pushed to the side as an unwanted third party. But it's important to note that these are just fan - created ideas and not in line with the official Naruto storyline. The lemon aspect usually adds a lot of adult - like romantic and physical elements that are not suitable for all audiences.
He might focus on his ninja training more. By pouring his energy into becoming stronger, he can distract himself from the neglect at home. Also, he could make friends outside his family, like Sasuke or Sakura, who would provide him with the support and friendship he lacks at home.
In Naruto fanfiction, the Rinnegan in Naruto is often portrayed in really cool and powerful ways. Some fanfics might give Naruto the ability to use all the Rinnegan powers to their fullest extent right away, like being able to effortlessly summon the Gedo Statue or use the Deva Path powers without any drawbacks. It's a way for writers to explore new storylines and make Naruto even more of a badass than he already was in the original series.
In Naruto fanfiction, the concept of 'Naruto Demon' can be portrayed in various ways. Sometimes, Naruto might be depicted as having some sort of inner demon that he has to struggle with, like a dark side of his chakra or personality. It could also be that a demon is fused with Naruto in the fanfiction's alternate universe. This can lead to new powers and challenges for him as he tries to control or come to terms with this new aspect of himself.
Naruto's relationships would be turned upside down. His close friends like Kakashi would be worried about him. They might try to find a way to reverse the effects of the bite. Meanwhile, Naruto himself might feel isolated because he's different now. He might also attract the attention of other vampires or vampire hunters, which would put his friends in danger and further complicate his relationships.
His relationship with Sasuke would likely become more complex. Sasuke might be both jealous and intrigued by Naruto's new powers. Naruto would have to prove that he still values their friendship despite his increased strength. With Sakura, she might see Naruto in a new light, perhaps with a bit more admiration as he now has such rare and powerful abilities.
Naruto's relationship with his enemies would surely be affected. Enemies might target him more if they think his red hair is a sign of a new power they can steal or a weakness they can exploit. On the other hand, some enemies might be more hesitant to attack him, fearing that the red hair is a sign of a new and unknown strength. His relationships within the ninja world in general would be in flux, as everyone tries to figure out what this red - haired Naruto means for the balance of power.
Well, in the fanfiction, it's possible that one of the sisters has a power related to the wind, just like Naruto. But instead of using it for offensive attacks mainly, she uses it for more defensive and utility purposes, like creating wind barriers or using the wind to carry messages. Another sister could possess a fire - based power. She could be a master of fire jutsu, creating intense flames that can melt metals. The third sister might have a unique power of light, being able to blind enemies or use light to create illusions.
His relationship with Sakura might change. Sakura, being a medic - ninja, could be constantly worried about his well - being and try to find ways to heal him or at least ease his discomfort. She might also admire his resilience even more.