Often, in these fanfictions, Naruto finding out about his heritage means uncovering secrets about his parents that were previously unknown. He could learn about their true motives, their relationships with other powerful characters, and how they influenced the events that led to his current situation. This knowledge might give him a new perspective on his life and his goals, and also create new conflicts and alliances as he tries to navigate the ninja world with this new information.
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.
One possible plot development is that Naruto could start to explore the secrets of his clan. He might search for ancient techniques or artifacts related to his heritage.
Often in such fanfiction, Ichigo's understanding of his own identity deepens. He may have to grapple with the responsibilities that come with his heritage. This could involve protecting a certain legacy or taking on a role within a hidden part of the Soul Society that was only accessible once he knew about his heritage. It can lead to internal struggles as he tries to balance his old self with this newfound knowledge.
One possible plot development could be Naruto seeking out other Uzumaki descendants. He might want to learn more about his heritage from them.
Well, one possible plot development could be that Naruto immediately starts training in the unique abilities related to his heritage. For example, if his heritage involves some special jutsu, he might quickly master it and use it to gain recognition in the village. This could change his relationship with his peers as they see him in a new light.
One interesting plot could be that Naruto discovers a long - lost clan technique. Maybe his mother's side had a unique jutsu that was lost over time. When he finds out about it, he has to train hard to master it, and this new power helps him in a big battle against a new, powerful enemy.
In the fanfic, Naruto may learn of his heritage through a new character. Maybe a mysterious ninja shows up who has some connection to his family. This ninja could start to train Naruto in ways that are specific to his family's ninja techniques, revealing more about his heritage as they train together.
One interesting plot development could be how Harry deals with the reactions of his friends. For example, Hermione might be initially shocked but then become very supportive, using her vast knowledge to research about this unprecedented situation for a male wizard. Ron, on the other hand, could be more comically bewildered and struggle to come to terms with it.
In some fanfictions, Paul could end up getting involved in the demigod world himself. Maybe he discovers he has some latent powers or a connection to the gods. This would completely change his perspective on life and his relationship with Percy. He could become a mentor figure for Percy in the mortal aspects of dealing with his demigod status.
One interesting plot development could be how Harry's relationship with the wizarding world changes. Knowing Sirius is his father might make him feel more confident and entitled to certain things. He might demand more answers from Dumbledore about his family's past and the secrets that were kept from him. Another aspect could be his relationship with the Weasleys. It might become a bit strained as he realizes his true lineage and starts to see himself in a different light, perhaps more of a pure - blood heir in his own mind, which could contrast with the Weasleys' more humble status.