On a personal level, Naruto would finally get the family he always wanted. But it might also bring some confusion and adjustment issues. His parents would be from a different time, and they'd need to adapt to the new world Naruto lives in. For example, they might be shocked by the new technology and the changes in ninja warfare.
One possible reason could be that they are too involved in their own shinobi duties. The world of ninjas is full of dangerous missions, and they might be constantly away on important tasks, leaving Naruto feeling neglected.
One aspect could be that the fanfiction shows Naruto's heartbreak in a very visual and emotional way. For example, he might see his parents in a dream - like state and then they disappear, leaving him feeling more alone than ever. It's a way to dig deeper into his character's vulnerability, which was somewhat masked in the original series by his determination.
It could be that in a special mission, Naruto discovers a hidden jutsu that allows him to communicate with the spirits of his deceased parents, leading to a touching reunion.
In this fanfiction, the reception could be mixed. On one hand, the older generation who remembered Minato and Kushina would be very glad to see them return. They were important figures in Konoha's history. But on the other hand, some of the younger shinobi who didn't know them might be a bit cautious at first. Still, once they learn about their heroic deeds, they would likely warm up to them.
The city of Gotham would also be affected. Batman has been a symbol of fear for criminals. Without his dark past driving him, there could be a power vacuum in the fight against crime. This might lead to an increase in criminal activity until new heroes or law enforcement methods emerge. Also, Batman's relationship with his villains would change. Some villains like the Joker might not have the same 'fun' without the brooding Batman they know.
His father could be Ash from Pokemon. Ash has had so many adventures and it would be interesting if he somehow ended up in the Naruto world and had a child with a Naruto - world character. His mother could be a random ninja who had a connection with Ash.
The Third Hokage, Hiruzen Sarutobi, would be a very important character. He was around when Naruto's parents were alive. He could have hidden records or memories that he might share with Naruto. Another possibility is Jiraiya. He was Minato's teacher and Naruto's godfather. He would have a wealth of knowledge about Minato and Kushina, and he could be a key figure in helping Naruto learn about his parents.
In many fanfictions, Naruto might start to discover information about his parents through a chance encounter. For example, he could find an old scroll or meet someone who knew his parents. Maybe he stumbles upon a hidden room in the Hokage's office that has some clues about his father, Minato. It could also be that an older ninja decides it's time to tell Naruto the truth after seeing his growth and determination.