This revelation would likely shatter Harry's previous idealized view of his father. He might start to question all the stories he had been told. For example, if he was told his father was a hero, now he has to grapple with the fact that he was a bully. It could make Harry feel conflicted, angry, or even a bit lost. He may wonder if he has any of those bullying tendencies in him too.
His friends might be shocked too. They could be supportive of Harry, trying to help him come to terms with this new information. For example, Hermione would probably start researching if there was any way to change this in the magical world's past, while Ron would be more about just being there for Harry, sharing his feelings.
Some of his other friends might react differently too. Some may be more cautious around him, worried about the power of the jinchuuriki within him. But those who truly trust Naruto, like Shikamaru, might not change their attitude much. They would see that Naruto is still the same person he was before, just with this added aspect to his identity.
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.
Often, it might happen when he stumbles upon a hidden family secret or has a heartfelt conversation with a key character who spills the beans. Sometimes it could even be a vision or a flashback that gives him the answer.
Maybe it's a mysterious figure from Merlin's past. Perhaps he had an encounter with a powerful magical being, and some kind of spell or pact led to the pregnancy. It could be a long - forgotten event that now resurfaces with this unexpected pregnancy.
Well, in this fanfiction scenario, if Naruto discovers Tsunade is his mother, it could change his entire world view. He has always seen Tsunade as a strong and somewhat intimidating figure in the village. Now, as his mother, she could become a more nurturing presence. Naruto might also start to question his own identity more deeply. He's used to being the orphaned Naruto, but now he has a family connection to one of the most powerful people in the village. This could lead to new storylines about him learning more about his family history and what it means to be related to Tsunade.
His confidence would probably soar. Knowing he has his parents, who are likely strong ninjas, supporting him would make him feel more secure. He might become a bit less reckless as he now has people who care about him deeply and he wouldn't want to worry them.
If Harry finds out Severus is his father in fan fiction, it could completely change the dynamic between them. Harry's view of Severus would shift from hatred or suspicion to a complex mix of emotions. He might start to understand Severus' actions in a new light, like his seeming animosity towards Harry in the original story could be reinterpreted as a father's tough love. This revelation could also change Harry's relationship with the other characters. For example, his connection to the Snape family, if there are any in the fan - made lore, would become significant. It could also impact how he views his mother, Lily, and her relationship with Severus.