Well, he might encounter the Nightsisters. Maybe he'll have to learn their unique magic or face their trials. He could also form an unlikely alliance with them against a common enemy.
If Naruto ends up on Dathomir, he would be in for a wild ride. Dathomir is known for its dark and mysterious nature. Naruto, with his positive attitude and strong will, could try to bring some light to the place. He might start by trying to understand the local culture and customs of the Dathomirians. The Nightsisters, being the dominant force there, could either see him as a threat or a potential ally. If they see him as an ally, Naruto could help them in their battles or internal power struggles. He could also introduce some of his ninja skills to them, and in turn, learn their magic. This exchange of skills and knowledge could lead to some really interesting story developments in the fanfic.
In a fanfic where Naruto ends up on Dathomir, he would be surrounded by a very different kind of power compared to what he's used to in the ninja world. The Force - like powers that the Nightsisters possess would be both fascinating and dangerous to him. He could get caught up in their power plays. However, Naruto's ability to make friends and his sense of justice might make him try to find a way to balance the power on Dathomir. He may end up training some of the Dathomirians in his ninja ways, creating a new group of warriors with a blend of ninja and Dathomirian abilities.
He'd likely use his ninja skills first. His ability to quickly assess situations would help him understand the new environment.
Well, in such a fanfic, Naruto could find himself in a society where female leadership shapes everything. Maybe the fighting styles are more feminine - oriented. He could befriend female characters who are now in more dominant positions, and together they might fight against new threats that emerge because of this different power structure.
Well, he might join a magic guild. Since Naruto is strong and has his own set of skills like ninjutsu, he could easily adapt to the magic battles in Fiore. Maybe he'd learn some magic too, combining it with his ninja abilities to become an even more formidable fighter.
Well, he might be completely confused at first. New York is so different from the Hidden Leaf Village. He could end up using his ninja skills to fight crime in the city, like a new kind of superhero. Maybe he'd team up with some local heroes or get into trouble with the police who don't understand his powers.
He would probably be very confused at first. The tall buildings, the busy streets and all the strange technology compared to his world in Konoha would be overwhelming.
Well, one possibility could be that Naruto is exposed to some extremely powerful and corrupting jutsu that slowly drives him insane. Maybe he starts seeing hallucinations of his friends turning against him and that messes with his mind big time.
This is a rather dark and unethical concept for a fanfic. Naruto is a character associated with values like friendship and freedom. However, if such a fanfic were to exist, perhaps it could involve some sort of dark magic or curse that forces Naruto into a situation where he has to deal with slaves. But this goes against the original spirit of the Naruto series.
One possible plot is that Naruto arrives in America and is initially confused by the different culture. But then he starts to adapt. He could use his chakra to perform amazing feats at a local circus or fair, becoming a local sensation. He might also encounter some villains who are after his ninja powers and he has to fight them off while trying to keep his identity a secret.
Maybe Naruto is sent to Africa on a mission by the Hidden Leaf Village. Once there, he discovers a new world full of different cultures and challenges. He could encounter magical creatures or powers that are unique to Africa in this fanfic. And he has to use his wits and ninja powers to either protect these newfound elements or to stop an evil force that is threatening both Africa and his own village back in Naruto's world.
One possible plot could be Naruto exploring the modern technology on Earth. He'd be amazed by things like cars and phones which are completely different from what he has in his own world. He might use his ninja skills in unexpected ways, like using his speed to compete in track races and becoming a local celebrity.