His abilities would be seen as god - like. His speed and strength would be far superior to most shinobi of that time. For instance, his ability to create multiple clones would be a very strange and powerful sight for them.
Naruto's abilities would be a game - changer in the Second War in the fanfiction. His chakra reserves are enormous compared to the shinobi of that time. This would allow him to keep fighting for long periods without tiring. His Sage Mode would be something completely unheard of. The shinobi of the Second War would probably be in awe of his power and try to either recruit him or figure out a way to defeat him. His ability to sense and track enemies using his chakra would also give him a huge advantage in battles.
If Naruto goes back to the Second War in fanfiction, his abilities would be both feared and respected. His Rasengan alone would be a terrifying jutsu for the shinobi of that era. They might see him as some kind of savior or a very dangerous anomaly. His ability to summon Gamabunta would also be something that would shock them, as giant summonings were not as common during the Second War.
If Naruto reincarnates in RWBY fanfiction, his abilities would be a source of great interest. His teleportation jutsu, like the Flying Thunder God Technique, would seem like magic to the RWBY characters. His chakra control could also be something that they would try to understand and perhaps learn from. Since the RWBY world is full of different powers, Naruto's abilities would add another layer of complexity and excitement. They might see his abilities as a way to gain an edge in their fight against the Grimm and other threats in Remnant.
It depends on the oc's abilities. If the oc has abilities similar to those in the Naruto world, like some form of chakra - based power, they might be seen as a normal, albeit new, addition to the ninja community. But if their abilities are completely different, like having some kind of technological power, they could be feared or highly respected. For example, if the oc can create advanced weapons with their technology, some ninja might see them as a threat to the traditional ways of fighting.
His abilities would likely be seen as very strange and powerful. The apes have never seen anything like Naruto's jutsus. His ability to run up walls and create clones would seem like magic to them. Some might fear him, thinking he's a threat to their way of life. Others, especially the more curious apes, might be intrigued and want to learn from him.
He might change the course of the war. Maybe he'd use his powerful jutsu to turn the tide for his side. For example, his Rasengan could be a very effective weapon against the enemies of that time.
Naruto's Rasengan would be a game - changer. In the Second Shinobi War, such a powerful and unique jutsu would be unheard of. He could use it to take out enemy strongholds or important leaders quickly.
His powers would be seen as extraordinary. The Rasengan alone would be a very powerful and unheard - of jutsu at that time.
His relationship with his father would be completely different. Instead of growing up without him, he could have a normal father - son relationship. His father could teach him ninjutsu from an early age.
His powers would likely be seen as very strange. The Naruto characters are used to chakra - based abilities, so Ichigo's spiritual powers would be a novelty.
His powers would be seen as extremely powerful and exotic. The ability to create multiple clones and use chakra - based attacks would be something completely new to the UA students and teachers.
If sent to the Third Shinobi War in fanfiction, Naruto's abilities would be crucial. His chakra reserves are vast, which means he could keep fighting for long periods. His ability to quickly learn new techniques could also be utilized. For instance, if he saw an enemy using a unique jutsu, he might be able to copy or modify it for his own use. His speed and agility, which he developed through his training, would allow him to dodge attacks and get into good positions for counter - attacks. Moreover, his strong willpower could inspire his comrades and make them fight more bravely.