One possible plot twist could be that his heritage is linked to an enemy he thought was unrelated. So he has to reevaluate his views on the whole conflict.
Obviously, Naruto himself is a key character as the story is about him learning his heritage. His mentor, like Kakashi, could also play an important role. Kakashi might notice some strange things about Naruto's abilities and start to suspect that there's more to his heritage. Then he could guide Naruto in the discovery process.
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.
In the fanfiction, when Naruto learns of his heritage, he often becomes more confident. Knowing where he comes from gives him a sense of purpose. He might start to train harder, believing that he has a greater destiny due to his lineage.
In some fanfictions, there could be entirely new characters created just for the purpose of guiding Naruto in his journey to learn about his heritage. These characters could be mysterious hermits or powerful warriors from a forgotten era who hold the keys to unlocking Naruto's true identity.
Well, in many such fanfictions, a key event could be Naruto finding a hidden scroll or meeting an old sage who reveals his heritage. Maybe he discovers some long - lost family heirlooms that give hints about his past.
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.
He might become more confident. Knowing his heritage early gives him a sense of belonging that he lacked before. So instead of constantly seeking attention in a brash way, he could be more self - assured and focused on his new - found purpose.
He might feel angry and frustrated. Naruto has always been proud of his potential and his roots in some way. Being denied his heritage would be like taking away a part of his identity, so he'd likely be quite mad at those who are doing the denying.
One consequence could be a loss of self - confidence. His heritage has been a part of what has motivated him to become stronger. Without that connection, he may start to doubt his abilities.