For Naruto, there could be consequences in his own world too. Using such a powerful ability to resurrect people from another universe might attract unwanted attention. Maybe some evil forces in Naruto's world might want to use his new - found ability for their own gains. Also, the act of interfering in another universe's natural order could create some sort of karmic backlash, and Naruto might have to face some challenges related to that in his future adventures.
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.
Well, in fanfiction, anything can happen. Maybe Naruto has some sort of super - ninjutsu that can cross dimensions and time. He could use chakra in a unique way to bring back the dead. For example, he might find a way to access the same magic or energy that created the Lazarus Pit in Batman's universe and use his own ninja skills to manipulate it for resurrection.
Emotionally, Naruto would have to deal with a whole new set of family relationships. He grew up without his parents, and now having them back would be a huge adjustment. He might struggle to fit into a 'normal' family dynamic, and there could be some friction as they all get to know each other again.
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.
First, Naruto would experience a new level of happiness. This would make him more positive in his outlook. He would no longer carry the same sense of loneliness that had shaped him in the past. In terms of his ninja skills, he might become more strategic, following Minato's guidance. Emotionally, he would be more balanced. He wouldn't be as quick to anger or jump into dangerous situations without thinking. His relationships with others would also change. He could be more of a role model for the younger generation in the village, inspired by his parents' example. And his sense of purpose might shift slightly. Instead of just seeking to be recognized, he would want to make his parents proud, which would add a new dimension to his character development.
He would probably become very distrustful. After all, if your own parents betray you, it's hard to trust anyone else. He might isolate himself from others in the village, thinking that if his parents could turn on him, anyone could.
His relationship with his parents would be loving. Minato would be a strict but fair father, teaching Naruto about ninjutsu and the responsibilities of being a shinobi. Kushina would be the warm, affectionate mother, always there to comfort and encourage Naruto. They would support his dreams and be proud of his every achievement.
The parents' relationship could also set an example for Naruto and Hinata. If Kushina and Hinata's mother had a strong, loving relationship, Hinata might be more inspired to be as loving and supportive in her relationship with Naruto. Similarly, Naruto could learn from his father's respect for Hinata's family and carry that forward in his relationship with Hinata.
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.
In the 'Banished Naruto's Parents Revealed Fanfiction', his parents could be presented as having been part of a group that was at odds with the village leadership. Maybe they were trying to bring about some kind of change that the elders didn't like. So, when Naruto was born, they were seen as a threat, and Naruto was made to suffer as a result. This would be a departure from the more heroic and straightforward view of them in the original series.
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.