In many fanfictions where Naruto discovers he has a sister, it often changes the entire dynamic of his story. It could give him a new sense of family and belonging that he lacked growing up. Maybe this sister was hidden away for some reason, like to protect her from Naruto's jinchuriki status bringing danger to her. This new relationship can also influence how Naruto approaches his ninja goals and his relationships with his friends.
One possibility in such a fanfiction is that the sister has unique powers or abilities. She might be a strong ninja in her own right, and together they could form a powerful duo. Their interactions could range from Naruto being overprotective to the sister teaching Naruto something new about his family or heritage. It could also add an interesting layer to the plot when it comes to Naruto's relationship with the Hidden Leaf Village, as the existence of his sister might be a secret that could have political implications if revealed.
The sister could also bring some new conflicts. For instance, if she has a different view on how the ninja world should be run compared to Naruto. This could lead to arguments and growth for both of them. Additionally, she might have her own set of friends or allies that Naruto has to get to know and work with, which would expand the cast of characters in the fanfiction and create more complex storylines.
In this kind of fanfiction, there could be a lot of possibilities. Maybe Harry would be overjoyed at first, feeling like he finally has a true family member besides his friends. He might try to protect his sister from the dark forces that he has always faced. For example, he would be extra cautious about Voldemort or his followers finding out about her.
In some fanfictions, Naruto could find out in a very emotional way. For example, his daughter might be in danger, and when he discovers she is his, his feelings of love and the need to protect her are intensified. He might also struggle with the fact that he has missed out on part of her life so far. He'd then start to make up for lost time by spending as much time with her as possible, teaching her ninjutsu and sharing his own life experiences.
He becomes more nurturing. Naruto, who has always had a big heart, now channels that into taking care of his daughter. He listens to her more intently, tries to understand her feelings, and is always there to offer support and advice, just like a good father should. He might also be more patient than he used to be. For example, if his daughter is having trouble learning a new ninjutsu technique, instead of getting frustrated like he might have in the past, he'll patiently guide her through it step by step.
In this kind of fanfiction, Naruto might initially be shocked. He would probably have to re - evaluate his whole identity. He has always seen himself as a ninja, but finding out he's a tailed beast would make him question his place in the ninja world. He might struggle with the idea that he is not just a human with a special power, but is in fact a tailed beast. This could lead to some interesting character development as he tries to come to terms with this new reality.
In some fanfictions, Naruto is completely devastated. He might go into a state of shock at first, unable to believe the news. Then he could be filled with intense grief and anger, blaming himself for not being there to protect Jiraiya.
He would be very angry. Naruto is not one to take betrayal lightly.
In many fanfictions, Naruto is initially in a state of shock. He can't believe that Jiraiya, his mentor, is gone. He might go into a period of deep sadness and isolation, withdrawing from others as he tries to process the loss.
One possible plot twist could be Naruto's struggle to adapt to a different gender identity within the ninja world. He might face discrimination or confusion from his peers at first. For example, his male friends like Sasuke or Shikamaru might be initially shocked and not know how to act around him. However, Naruto's strong will would likely drive him to prove that gender doesn't define his abilities as a ninja. He could still pursue his dreams of becoming Hokage, but now also deal with the added challenges of being a female in a male - dominated society in the ninja world.
She might be overjoyed. After all, Naruto is her son. She could immediately rush to find him and embrace him tightly, tears of happiness streaming down her face.