With his mentor figures like Kakashi, they would likely try to guide Naruto on how to handle this new discovery. They would caution him about the potential dangers and help him understand the responsibilities that come with possessing such an ancient weapon.
His friends might be a bit wary of the sentient weapon at first. Sasuke, for instance, might be suspicious and think it could be a danger. But Naruto would try to convince them that it's okay. Over time, if the weapon proves useful, they could come to accept it.
In a Naruto finds ancient technology fanfiction, his relationship with his sensei, like Kakashi, could be affected in an interesting way. Kakashi would be both proud of Naruto for the discovery but also cautious. He would guide Naruto in understanding the technology. This would create a new dynamic in their relationship, with Naruto relying more on Kakashi's wisdom and Kakashi having more faith in Naruto's judgment as he deals with this new and powerful discovery.
If the weapon is a blade, it will probably make his taijutsu more lethal. He can combine his already impressive speed and strength with the weapon's sharpness. His attacks will be more precise and deal more damage.
If the summoning contract has a connection to a particular family in the village, it could improve Naruto's standing with that family. He might be invited to their family events and be seen as an honorary member. However, if the contract is related to a dark or secretive part of the village's past, some villagers might be afraid of Naruto and try to distance themselves from him.
It could strengthen his bonds with his friends. They would be intrigued by the alien technology and would want to work together with Naruto to figure it out. His relationship with Kakashi, for instance, could become more of a partnership in exploring the new technology. Kakashi's experience and knowledge combined with Naruto's new discovery could lead to some really interesting developments.
His relationship with Sasuke might change. Sasuke could see Naruto's new power as a challenge or something to envy. It might also make Sakura more attracted to Naruto because of his increased strength.
If the weapon is a chakra - enhancing tool, it will boost Naruto's existing jutsu. For example, his Rasengan could become more powerful, being able to break through stronger defenses.
If the scroll contains new jutsu, Naruto's training will take a new turn. He'll have to focus on mastering this new technique, which could be different from his usual Rasengan - based attacks. This might involve learning new chakra manipulation methods, which could be both challenging and exciting for him.
In this type of fanfic, Naruto's friends might become more protective of him. They see him as being alone in the love aspect and might try to fill that void in other ways, like by being even more supportive and spending more time with him. This could lead to some really heartwarming friendships.
On the positive side, it might inspire new technology in the ninja world. The unique energy and design of the lightsaber could give the ninja inventors new ideas. For example, they could try to create a similar type of weapon that uses chakra instead of the lightsaber's energy source.