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.
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.
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.
He might discover a new type of chakra control method. His mother could have been an expert in chakra manipulation, and the scrolls could hold the key to a more advanced or unique way of using chakra, which would be a great asset for Naruto.
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.
The scrolls might contain special jutsu. Maybe his mother was a great ninja with unique techniques that she recorded in those scrolls. Naruto could learn powerful moves from them, which would help him in battles against tough opponents.
Well, it could lead to him uncovering secrets about his family. Since he is an Uzumaki himself, these scrolls might have information about his parents or ancestors that he never knew before. This could give him a deeper understanding of his heritage and place in the ninja world.
He might find that the jutsu scrolls are not as straightforward as they seem. There could be some sort of hidden message or a requirement to unlock the full potential of the jutsus. For example, the scrolls could be protected by a chakra - based lock that only Naruto's unique chakra can break after he has passed certain trials. And once he does unlock them, the new jutsus could change the way he fights completely.
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.
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.
One possible secret could be about Naruto's real parents' untold past. Maybe there are hidden details about how his father and mother met that were not in the original story.