When Naruto first discovers his demon heritage in the fanfiction, it's likely to be a very emotional moment for him. He has grown up without any knowledge of this aspect of himself. He may feel betrayed, as if those who raised him, like Iruka - sensei, should have told him. At the same time, he might be excited in a way. Naruto has always been an outcast in some ways, and this new discovery could give him a sense of uniqueness that he might embrace. He may start to explore his new - found identity, trying to figure out how his demon side affects his chakra, his abilities, and his relationships with others. For example, he might worry about how Sakura or Sasuke will react when they find out. And he'll probably be eager to learn more about his demon heritage, seeking out any information he can find about it in the ninja world.
Well, Naruto could have a range of reactions. On one hand, he might feel a sense of isolation, thinking that he's different from all the other ninjas he knows. But on the other hand, his adventurous spirit could also make him curious about what this new part of him means. He might start to wonder about his powers and how they relate to his demon heritage. He could also be a bit scared, especially if he has been taught to fear demons in the ninja world.
Naruto might initially be confused. He has grown up with a certain view of himself, and this new information about his heritage completely shatters that. He may struggle with his identity for a while, but as he digests the information, he could start to feel a sense of pride. He might think that now he has a greater purpose, something that ties him more closely to his family and the ninja world in general. He may also become more confident in his abilities, knowing that he comes from a great lineage.
Perhaps he could have some sort of dark - based chakra manipulation. Demons usually have unique chakra, and Naruto's demon part might allow him to use a different form of chakra that gives him new jutsu, like the ability to create shadowy clones or dark - energy attacks.
Sakura might be shocked at first, but then she'd be really happy for Naruto. She'd probably be more protective of him too, especially if there are any threats related to his heritage. After all, she's always cared about him in her own way.
It's possible he gains enhanced physical abilities like super strength or speed. Since his heritage is often tied to some special genetic traits, these could be unlocked upon the revelation. For example, if his heritage is linked to a powerful clan, he could inherit their natural combat prowess. He could also find out about special chakra control abilities that are exclusive to his bloodline, which would give him an edge in battles.
Naruto would probably be very kind and protective. He knows what it's like to be alone as a child, so he'd do his best to make the child feel safe and loved.
One interesting plot could be Naruto finding out about his mother's clan and their unique abilities. Maybe he discovers a hidden jutsu passed down in her family that he can then learn and use to his advantage in battles.
In addition to the main characters related to Naruto directly, some fanfictions might include other village elders or shinobi who knew about the Uzumaki clan's past. For instance, an old ninja who was friends with Kushina's parents could surface with crucial information about Naruto's heritage. There could also be antagonists who are interested in Naruto's newly discovered heritage for their own evil plans.
Naruto would most likely see the wolf as a new comrade. He has a strong sense of justice and would feel responsible for protecting the wolf. He would introduce the wolf to his friends like Sasuke and Sakura. They could all train together, with Naruto showing off his Rasengan and the wolf showing off its natural hunting skills. And Naruto would always be there to make sure the wolf is safe and happy in the ninja world.
At first, Naruto might be a bit cautious. He's used to facing opponents in battle, and a strange new object like a robot could potentially be dangerous. But once he realizes it's not an immediate threat, he'd likely approach it with his usual enthusiasm. He might start asking it all sorts of questions, like 'What are you?' and 'Where are you from?' His reaction would be a mix of excitement and wariness.
Naruto's reaction would be a mix of curiosity and caution. He would be curious to explore the contents of the Bingo Book, looking at the profiles of different ninjas. However, he would also be cautious because he knows that having this book could make him a target. He might also feel a sense of responsibility, thinking that he has to protect the information in the book from falling into the wrong hands. He may even try to find out how the Bingo Book is updated and who is in charge of it, so that he can understand the system better and use it more effectively.