Common themes in this type of fanfiction are abandonment and its consequences. Naruto's world is turned upside down by his parents' forgetfulness. Another theme is the search for acceptance. He wants to be accepted by the village and by others, but it's harder when he has this gaping hole in his family history. Also, the theme of inner strength is present. He has to dig deep within himself to find the strength to carry on. It's about how he can build his own self - worth when those who should have given it to him from the start (his parents) are absent.
One common theme is isolation. Since she's forgotten by her parents, Fem Harry often feels alone in the wizarding world. Another theme is self - discovery. Without her parents' influence, she has to figure out who she is on her own.
Perhaps in this fanfiction, Naruto starts to have dreams about his parents where they seem distant and unrecognizable. This makes him search for answers, leading him on a journey where he uncovers secrets about his family that were long buried. As he digs deeper, he realizes that there were forces at work that made it seem like his parents forgot him, when in reality, it was a much more complex situation.
Well, it could be that Naruto's parents, Minato and Kushina, somehow lose their memories of him. Maybe due to a powerful jutsu gone wrong. Naruto then has to deal with the pain of seeing his parents act as if he doesn't exist. He might try to find a way to reverse the effect, all while still facing the usual challenges in the ninja world.
A prevalent theme is heritage. It could be about the cultural or genetic heritage that Tails got from his parents. The theme of hope also exists, where his parents' hopes for Tails are a driving force in the story. Another theme is the power of memories. Tails' memories of his parents can be a source of strength or sadness in the fanfiction, and it often shapes his actions and decisions.
In such a fanfiction, Naruto's character development could be really interesting. Without the support of his parents, he might become more self - reliant at a very young age. He'd have to learn to fend for himself, which could make him tougher both physically and mentally. Maybe he'd be more distrustful of others initially because he's been abandoned. But as the story progresses, he could learn to open up again through new friendships, like he did with Sasuke and Sakura in the original series, just in a more complex and painful way.
Well, there could be characters like Iruka - sensei. Since Naruto has been forgotten by his parents, Iruka might play an even more important role in Naruto's life, becoming like a surrogate father figure. Another character could be Sasuke. Sasuke, who also has his own family issues, might either be a source of understanding for Naruto or a contrast to his situation.
One common theme is self - discovery. Naruto has to figure out who he is without the guidance of his parents. Another is loneliness, as he would feel isolated from the family bond he never had. There's also often a theme of revenge or at least a desire to understand why his parents neglected him.
Well, identity is a common theme. Percy has to re - establish his identity without the memories others have of him. Another is the theme of revenge in some cases. If he was wronged by those who forgot him, he might seek revenge. And the theme of growth is there too. He grows as a person, becoming more self - reliant and wiser as he deals with the situation of being forgotten.
It could be Orochimaru. He's always been interested in experimenting and causing chaos. Maybe he wants to use Naruto's parents' forgetfulness as a way to study the Uzumaki clan's mental state or something related to their chakra. He might see Naruto's vulnerability in this situation as an opportunity to get closer to his goals.
One possible reason could be a curse. Maybe some enemy put a curse on Naruto's parents that made them forget about him. It could be a way to get back at them by targeting their most precious thing, which is their son.