Well, his metal skin could enhance his defense greatly. Enemies' attacks like kunai stabs or basic jutsu blasts might be deflected or absorbed more easily. It could also add weight to his punches, making his physical attacks more powerful.
Maybe it was the result of some experimental jutsu gone wrong. Or perhaps he was exposed to a special kind of metal - based chakra.
It would likely boost his combat skills. Since metal is generally tougher than flesh, his strikes would be more forceful. For example, in close - combat situations, he could use his metal limbs to overpower opponents more easily. Also, he might be able to attach ninja tools or weapons directly to his metal limbs, making them more accessible during battle and increasing his overall combat efficiency.
The metal claws could enhance Naruto's close - combat capabilities. They would give him an edge in slashing and grappling. For example, he could use them to quickly deflect incoming kunai or shuriken. Also, they could be used in combination with his shadow clone jutsu. One clone could distract an opponent while Naruto himself uses the claws to strike from an unexpected angle.
One special ability could be enhanced strength. The metal arm might be able to deliver much more powerful punches than his normal arm, allowing him to break through tough defenses more easily.
Well, it could change the battles significantly. For example, he could use his metal - controlling ability to deflect enemy attacks made of metal weapons. This would give him an edge in combat and might lead to quicker victories, thus altering the course of the story.
If Naruto has adamantium bones in the fanfiction, it would likely enhance his combat in multiple ways. Firstly, his body would be more resistant to damage from blunt force. When he clashes with opponents, his bones wouldn't break easily. Secondly, he could use his bones as a weapon in a more aggressive way. For example, if he were to perform a head - butt or a bone - based jutsu, the adamantium would make it extremely effective.
Naruto's lightning affinity in fanfiction can give him an edge in combat in multiple ways. Firstly, he could develop unique jutsu. He might create a lightning - based Rasengan, which would be more penetrative and quicker than the normal one. Also, it could help him in terms of mobility. He could use lightning to move around the battlefield at lightning - speed, dodging attacks easily and getting into better offensive positions.
Chakra metal can significantly enhance a ninja's power. If a ninja wields a weapon made of chakra metal, it can amplify their chakra output. For instance, a kunai made of chakra metal might be able to carry a more powerful chakra - charged attack than a regular kunai.
The fox armor can significantly boost Naruto's combat abilities. It might increase his physical strength, allowing him to land more powerful punches and kicks. For instance, he could easily break through tough defenses that he previously struggled with.
Well, it could be that he got it as a gift from some super - advanced ninja technology group in the fanfiction world. Maybe they saw his need for an extra weapon or tool during battles and decided to equip him with a metal arm.