He might meet a powerful wizard who is the ruler of that dimension. This wizard could initially be hostile towards Natsu, seeing him as an intruder, but later they could become allies.
Well, perhaps Natsu could find himself in a dimension where magic works completely differently. He might have to learn new ways to use his fire magic or even discover new types of magic altogether. Maybe he meets alternate versions of his friends who have different personalities due to the different environment of that dimension.
One possible plot twist could be that in the other dimension, Naruto finds out that all his friends have different personalities. For example, Sasuke could be a peaceful scholar instead of a brooding avenger. Another twist might be that the chakra system works completely differently in this new dimension. Maybe instead of using hand signs, they use some kind of mental power to perform jutsus. Also, Naruto could discover that the Akatsuki in this dimension are actually the good guys, fighting against an evil ninja clan that wants to take over the world.
His relationship with Sasuke would be very different. In the new dimension, Sasuke might not have the same vendetta against his brother. So Naruto wouldn't have to worry about Sasuke going off the rails. With Sakura, she could be a powerful ninja in a different way, like she might be more focused on medical ninjutsu and Naruto would see her in a new light. And his relationship with Kakashi could change too. Maybe Kakashi is a strict military - like leader in the other dimension instead of a laid - back teacher.
One common theme is self - discovery. When Natsu meets another version of himself, he often learns new things about his own capabilities and personality. Another theme is cooperation. Since they are essentially the same person, they have to learn to work together despite their initial differences.
A time-traveling novel usually referred to the protagonist traveling to a fictional two-dimensional world to experience various adventures and stories. These novels often involved anime, comics, games, and other cultural elements. Some of them had become classics, such as The Master, Battle Through the Heavens, and Grave Robber's Chronicles. The novels about time travel had become a very popular genre and were welcomed by the majority of readers.
There's a great piece of 'natsu meets natsu dimension travel fanfiction' where Natsu travels to a parallel dimension and meets another version of himself. This other Natsu has different magical powers. They end up teaching each other new spells and techniques while trying to find a way to close the rift between their dimensions. It's really exciting to read how they interact and grow together.
In reality, fictional characters aren't real in another dimension. They are just figments of our creativity, existing only in the stories we tell and the minds that conceive them. There's no scientific evidence to suggest they have a real existence elsewhere.
One potential ally could be a wise old wizard from a magical dimension. They might have vast knowledge of the multiverse and help Robin navigate through different dimensions. Another could be a street - smart thief from a dystopian dimension. The thief's skills in sneaking around and getting out of tight spots could come in handy. And a friendly alien from a technologically advanced dimension could also be an ally, providing Robin with advanced gadgets and knowledge about different technologies.