His confidence would probably soar. Knowing he has his parents, who are likely strong ninjas, supporting him would make him feel more secure. He might become a bit less reckless as he now has people who care about him deeply and he wouldn't want to worry them.
Naruto would probably want to introduce his parents to all his friends. It would be a big moment for him to show off his family, especially to Sasuke. His relationship with Sasuke could also be affected in a positive way as Naruto now has a more complete family.
Well, one thing that could happen is that Naruto would be overjoyed. He has always longed for a family, and to suddenly find out his parents are alive would be a dream come true. He'd probably have a million questions for them about his past, why they had to be away, and what their lives were like. And his relationship with his friends might change a bit too, as he now has this new family aspect to his life.
In such a fanfiction, Harry would likely be in shock. His world view has been centered around their deaths for so long. He could be hesitant to trust this new reality. But once he does, he'd have a whole new support system. His parents could teach him magic they've learned in their 'hidden' years. This would make him even more powerful and give him a different standing among his peers.
Well, it would be a huge shock for Naruto. In the original, he had no idea about his family. If they were alive, Naruto might not be so eager to gain recognition from the village. His family could teach him things he didn't learn from the academy or from Jiraiya. And his family might have secrets or powers that could help him in battles. Maybe his father could teach him some advanced space - time jutsu. It would also add a new layer of family drama to the story, like dealing with family expectations and reuniting with long - lost relatives.
She might be overjoyed. After all, Naruto is her son. She could immediately rush to find him and embrace him tightly, tears of happiness streaming down her face.
Well, one possibility is that Dark Naruto would be overjoyed. After all, Kushina is his mother. But at the same time, he could be very conflicted. His dark side might make him suspicious of her motives. He could test her in various ways to see if she's really who she says she is. And Kushina, on her part, would probably be heartbroken to see what her son has become.
Some fanfictions might have a plot twist where Naruto's family is alive but has lost their memories. So Naruto has to help them regain their memories while also dealing with the fact that they are his family. Another common twist is that his family has been living in another dimension all this time. And when Naruto finds out they're alive, he has to find a way to bring them back to his world. There could also be a twist where his family was actually kidnapped and held captive by an enemy, and Naruto has to rescue them.
Naruto's personality could become more confident and stable. With a mother figure in his life, he would have someone to turn to for emotional support. He might not be as impulsive as he was before because Kushina could give him advice based on her own experiences. For example, when dealing with conflicts in the village or with other ninja, he would think twice instead of jumping into action right away.