One possible plot could be that a powerful and secret organization kidnaps Naruto as a baby right from his parents' arms. They might have some dark motives like using Naruto's potential power for their own evil schemes. Maybe they plan to raise him in a way that turns him against the Hidden Leaf Village in the future.
The Akatsuki is also a possibility. They are after jinchuriki, and if they knew about Naruto's existence as a baby, they might try to kidnap him early. They could think that by having him from the start, they can better control the Nine - Tailed Fox within him.
Perhaps in this fanfiction, there is a prophecy about Naruto. Some people might believe that Naruto will bring great change, either good or bad, to the ninja world. Those who want to prevent the 'bad' change or those who want to accelerate the 'good' change might kidnap him from his parents. They think they can influence Naruto's upbringing and future actions according to their own desires.
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.
The plot could start with Naruto growing up in a happy family. He'd learn about the village and ninja ways in a more positive environment. His first missions might be more successful as he has his parents' advice. As he grows, he might face threats to the village earlier, but with his family by his side, he'd be better equipped to handle them.
Naruto might become more distrustful. Being kidnapped from his parents at a young age could make him question the intentions of others. He may grow up being more cautious around people and not easily trust those who seem friendly at first sight.
One possible plot could be that Harry grows up in a loving and magical home. He gets to learn magic from his parents at a very early age. His father, James, might teach him Quidditch skills right in their backyard. His mother, Lily, could pass on her knowledge of potions and herbology. They would also protect him from the dark forces that are still out there, perhaps leading to some epic battles where the family stands united against the remnants of Voldemort's followers.
In this fanfiction, Naruto finds himself in a parallel universe where his parents are not only alive but also play a significant role in his life. There are new adventures and challenges as he navigates this changed reality.
His reaction would depend on how the betrayal was presented. If it was a sudden revelation, he would be shocked and devastated. He may start to question his own worth, thinking that if his own parents could betray him, what was wrong with him? He could also become more reckless in his actions, not caring about the consequences as much since he felt like he had already lost the most important thing. This new Naruto could also be more empathetic towards the villains in the story, understanding their feelings of being wronged or betrayed in some way.
Well, one possible plot could be that Naruto and his friends immediately set out on a rescue mission. Naruto might use his shadow clone jutsu to search a large area quickly. Sasuke could use his sharingan to track the bandits. They would face various obstacles on the way, like traps set by the bandits. And when they find Ino, she could have used her mind - transfer jutsu to gather some information about the bandits' plans, which would help them in defeating the bandits and getting her back safely.