Even Naruto himself could be the main character in a dimension - travel fanfiction. He could be sent to different dimensions to spread his message of peace and friendship, and in the process, face new challenges and enemies that test his resolve and his newfound powers.
Sakura could be one of the main female characters. She has a long - standing relationship with Naruto in the original series, so it would be interesting to see how their dynamic changes in a harem - like situation in a different dimension. Hinata is also a likely candidate, given her deep feelings for Naruto. Her shy but determined nature would add an interesting element to the harem story.
One idea could be that the main character accidentally activates a forbidden jutsu that transports them to different dimensions in the Naruto universe. For example, they might end up in a dimension where the Akatsuki has successfully captured all the tailed beasts and rule the world. They then have to find a way to team up with some of the remaining shinobi to reverse the situation.
A group of rogue ninja from the other dimension could also serve as the main antagonists. They might be jealous of Naruto's power from his original dimension and want to steal it for themselves. They could be led by a charismatic and devious leader who has a personal vendetta against Naruto for some reason, like he believes Naruto will disrupt their way of life in the dimension.
It could be an alternate version of Orochimaru. Maybe in this new dimension, he has achieved ultimate power and is using it to control the different ninja villages.
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In this universe, the original mother star had already died. The heroes of the past, the powerful Awakened Ones, the eternal Eternals, and the lofty War Gods had also dissipated over the long years. However, the countless wars they led had driven out all the aberrations and gods. Their brilliant achievements would forever be remembered in human history. The civilization had thus been able to develop for a long time. Now, it was as vast as the galaxy, encompassing everything. At present, mankind had conquered countless galaxies, but the boundaries of the universe seemed endless. There were still a large number of unknowns that they had yet to come into contact with. At this moment, the universe was aging rapidly for unknown reasons. Even so, mankind would not give up on exploring the universe until the end of the world. 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One possible main antagonist could be a powerful being that controls the different dimensions and sees Naruto's hopping as a threat to his order. Another could be an evil version of Naruto from another dimension who wants to stop our Naruto from spreading his 'good' influence. Maybe a group of rogue dimension - travelers who are causing chaos in different dimensions and Naruto has to stop them.
The plot might involve Naruto having to adjust to the new world of RWBY while also dealing with his own godlike status. He could end up teaching the RWBY characters some of his jutsu, like the Shadow Clone Jutsu, which could be useful in battles against large numbers of Grimm. And perhaps there would be some sort of conflict where his powers are both a help and a hindrance, like attracting unwanted attention from powerful enemies in the RWBY world.
One possible fanfiction could be about Naruko traveling to different dimensions in the Naruto universe and meeting alternate versions of her friends and enemies. She might learn new jutsus or gain unique powers from these encounters.
One great 'Dimension Travel Naruto Fanfiction' is 'A New Path in Another World'. In this fic, Naruto gets transported to a different dimension where the ninja world has some unique and strange rules. It's really interesting to see how he adapts his skills to this new environment.
In dimension travel fanfictions, Naruto usually gains a broader perspective. When he sees different versions of his friends or different ninja cultures in other dimensions, he starts to question his own beliefs and values. This leads to his growth as he becomes more open - minded and understanding. He may also face new challenges that test his courage and determination in ways he hasn't experienced in his own dimension, which further hones his character.