At first, Naruto might be a bit hesitant. He's not used to having something so personal from his parents. But then, his curiosity would get the better of him, and he would slowly unroll the scrolls, his hands trembling slightly as he realizes that he's about to learn things he has always dreamed of knowing about his parents.
In the fanfiction, the scrolls could reveal a lot. For example, they might disclose the circumstances of Naruto's birth. Maybe there are prophecies written in them about Naruto's future. There could be stories of his parents' love and how they made sacrifices for the village and for Naruto. It could also be that the scrolls contain some sort of training method that was unique to his family, which would help Naruto become even stronger as a ninja.
It could speed up his training significantly. If the jutsu scrolls contain advanced techniques, Naruto can learn from them and gain new skills faster than just relying on his regular training with Kakashi. For instance, if there's a jutsu for enhanced strength, he can add it to his arsenal and become stronger in combat.
He might be initially very confused and hurt. Naruto has always longed for a connection to his parents, and finding out they gave away his birthright could make him feel like he was unwanted or that they didn't trust him with it. He could go through a period of self - doubt, wondering if he is really worthy of being their son.
The scrolls could hold secret jutsu. Uzumaki clan was known for unique abilities, so it might be something like a powerful sealing jutsu. Maybe Naruto discovers a new way to enhance his Rasengan using the knowledge from the scrolls.
Iruka could play a role. He was Naruto's first teacher who believed in him. He might have some small piece of information that starts Naruto on his journey to find his parents. Then there's Tsunade. As the Hokage, she has access to a lot of secret files. She could either be an obstacle, not wanting Naruto to dig too deep, or she could be a helper, providing him with crucial information. And of course, the Nine - Tailed Fox. It was sealed inside Naruto by his father, so it might have some memories or knowledge related to Naruto's parents that it could share with Naruto.
Well, it could be that Naruto is on a mission and accidentally uncovers a powerful jutsu that has the power to show the past. And through this, he sees his parents. His father might give him some advice on how to become a better ninja or how to handle the power within him. His mother could tell him how much she loved him and why they had to sacrifice themselves. Then Naruto could use this new understanding to face his enemies more bravely.
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.
In some fanfictions, Naruto may become extremely bitter. He could feel a deep sense of betrayal and this might fuel his determination to become stronger, not for the sake of the village at first, but more for self - vindication. He might isolate himself from others and struggle with his identity.
If the scrolls contain difficult knowledge or a great responsibility, Naruto might become more serious. He would have to grow and adapt to handle whatever new situation the scrolls present. For example, if there are dangerous jutsu in the scrolls, he has to be more cautious and mature in his decisions regarding their use.
Well, Naruto could have a range of reactions. On one hand, he might feel a sense of isolation, thinking that he's different from all the other ninjas he knows. But on the other hand, his adventurous spirit could also make him curious about what this new part of him means. He might start to wonder about his powers and how they relate to his demon heritage. He could also be a bit scared, especially if he has been taught to fear demons in the ninja world.