One potential consequence could be a loss of his sense of self. If he's raised just as a weapon, he might not develop his own values and emotions fully. He could become a tool for others' purposes without any real understanding of right and wrong. Also, his relationships would be severely affected. His friends might fear him or be used against him. And he may struggle with identity issues, constantly torn between being a weapon and a person with his own will.
Maybe in this fanfiction, Naruto is separated from his normal friends and mentors. Instead, he is surrounded by cold - hearted trainers who see him as nothing but a tool. They might even suppress his emotions so that he can be a more effective weapon. He could be sent on dangerous solo missions where the sole objective is to eliminate the target using his new - found combat skills.
The Hidden Leaf Village elders could be the main antagonists. They might see Naruto as a means to an end, a weapon to maintain the village's supremacy. So they push him to the limits without caring about his feelings or future.
He would be more cold - blooded. Instead of the warm - hearted Naruto we know, he'd be focused on combat and following orders. His personality would lack the playfulness and the drive to make friends.
He could have enhanced physical strength and speed. Since he's raised as a weapon, his trainers would focus on maximizing his physical capabilities. Maybe he can move so fast that he's almost a blur in battle. And his strength could be on a level where he can break through solid rock walls with ease. Also, his chakra control might be more precise, allowing him to perform complex jutsu with greater efficiency.
In the 'Naruto is raised as a living weapon' fanfiction, Naruto's personality would deviate significantly from the source material. He would likely lack the innocence that defines his character in the original series. Being raised as a weapon, he would be trained to suppress emotions that could interfere with his combat effectiveness. This could lead to a more reserved and calculating Naruto. He may view relationships as strategic alliances rather than bonds based on friendship and mutual respect. His sense of self - worth would be tied to his performance as a weapon, rather than his identity as a person or a ninja. This could also make him more prone to following orders blindly, at least initially, until he starts to question his purpose and break free from the constraints of being just a weapon.
In some Naruto fanfictions, Hinata could potentially be portrayed as a 'weapon' in a very metaphorical sense. For example, her Byakugan abilities might be exploited in unique ways that make her seem like a strategic weapon for a side or a cause. But in the canon Naruto story, she is a character with her own agency and not really a weapon.
Perhaps it's a unique staff. A staff could have different uses, like being a conduit for chakra. It could also have hidden compartments or be made from a rare material that gives Naruto an edge in battles. For example, it might be made from a metal that can absorb chakra attacks and then redirect them.
It could be an old sage. There are often sages in the Naruto world who have access to powerful artifacts. An old sage might see Naruto's potential and give him the weapon to help him in his fight against evil.
Naruto might be a staff - type weapon. He could use it for both close - range combat and to channel his chakra or soul power. The staff could have different forms, like it could extend or transform into other shapes depending on the situation, similar to how he can transform his Rasengan.