Well, losing an arm would definitely have a huge impact on his ninja abilities. His ability to perform hand seals would be severely hampered. For example, complex jutsus that require multiple and quick hand seals might become impossible for him to execute. Also, his balance in combat could be affected as he's used to having two arms for movement and defense. He'd probably have to rely more on his legs and other non - arm - related skills.
With his friends, it might strengthen their bonds. They would be more protective of him and help him in his daily tasks. For example, Sasuke might become more empathetic towards Naruto's situation. His relationship with Hinata could also change. Hinata would be very concerned and would constantly be by his side, offering emotional support.
It could make Sasuke more protective of Naruto. Sasuke has always had a complex relationship with Naruto, and seeing him lose an arm would stir up some deep emotions. He might feel guilty, especially if he was somehow involved in the incident that cost Naruto his arm. This could lead to Sasuke staying closer to Naruto and being more open about his feelings.
His combat abilities are severely affected. Naruto is known for his physical combat skills combined with his chakra - based attacks. Without his right arm, his punches and grappling moves are limited. He can't hold his kunai or shuriken as effectively in combat, which reduces his ranged attack options.
Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.
It could enhance his ability to customize his ninja tools. For example, he might be able to make kunai that are sharper and more durable, giving him an edge in combat. Also, if he can smith special tools that can better channel his chakra, like a new type of shuriken, his ranged attacks could become more powerful.
In some fanfictions, Naruto's growth spurt might make him more physically powerful. He could have increased strength and speed, which would enhance his taijutsu skills. For example, his punches could become more forceful, allowing him to take on stronger opponents more easily.
His relationships would shift in many ways. With his family, if he has one by that point, they would be deeply concerned and try to help him adjust. His comrades in the Hidden Leaf Village would be more watchful over him. Enemies would likely underestimate him at first, which could be both a danger and an opportunity for Naruto. His relationship with the tailed beasts might also change, as they might be sympathetic towards his new disability and offer different kinds of support or advice.
Losing his real arm is a major turning point for Bucky. He was used to his body being a weapon, and now a part of that weapon is gone. This forces him to confront his own mortality and limitations. He might become more empathetic towards others who have disabilities or who have suffered loss. It also gives the writers of the fanfic a chance to explore his resilience. He can either let this loss break him or use it as a springboard to become a more complex and well - rounded character.
Well, it could potentially enhance his balance and agility. Just like a real monkey, the tail might act as an extra limb for Naruto. He could use it to swing from trees or structures in the ninja world more easily, giving him an edge in forest - like battle terrains. Also, it might be used for some unique jutsu combinations, like using it to direct the flow of his chakra in a more precise way.
Maybe he was protecting someone in Wave. He's always the self - sacrificing type, so he could have put himself in harm's way to save a villager or a friend.