Typically, Naruto himself would be a central character as he is the main protagonist of the Naruto series. Then there would be female characters from the Naruto universe who form the harem. This could include Sakura, Hinata, and maybe some other kunoichi like Tenten. The characters with rinnegan powers, such as Nagato, could also be involved in some way, either as a source of inspiration for the main character's rinnegan or as a rival.
One interesting plot point could be how the rinnegan powers are incorporated into the harem dynamics. For example, the character with the rinnegan might use its abilities to protect the members of the harem. Another could be the relationships that develop within the harem due to the unique situation of the naruto universe and the presence of the rinnegan.
The main features? Firstly, the rinnegan is a big deal. It can change Naruto's status in the Naruto world and how others perceive him. As for the harem, it's not just about love. It's also about friendship and loyalty among the harem members. These fanfictions may also feature unique story arcs that are related to the rinnegan and the harem. For instance, Naruto might have to use his rinnegan to protect his harem members from a common enemy, which would involve battles and strategic planning, all while dealing with the complex relationships within the harem.
One interesting storyline could be the main character with the Godlike Rinnegan exploring different relationships within the harem. Maybe he uses his powers to protect the members of the harem from various threats in the Naruto universe.
I know a 'naruto rinnegan harem fanfiction' named 'Naruto: Rinnegan's Harem Quest'. In this story, Naruto's rinnegan gives him abilities that lead to unexpected encounters and relationships. It combines elements of adventure, mystery, and of course, the harem aspect. The character development is also quite good as Naruto navigates through his newfound situation with his harem members.
Naruto himself is often included as he has a central role in the Naruto universe. Also, characters like Hinata, Sakura might be part of the harem. And Sasuke could also be involved in some way, either as a rival or an ally to the main character with the Godlike Rinnegan.
In certain fanfictions, the use of Rinnegan - powered time travel could lead to the discovery of hidden secrets in the Naruto world. As for the harem, the main character might find himself in situations where he has to protect multiple female characters during his time - traveling adventures. This protection and shared experiences could then lead to the formation of the harem. For instance, he travels to a time when the Akatsuki is more active and saves some female ninjas from their attacks, and they fall for him.
The Rinnegan's time travel can completely change character relationships. For example, if a character travels back in time, they might meet their friends or enemies at a different stage of their lives. In a harem fanfiction, this could mean that a male character meets a female character before she has certain prejudices or before she has fallen in love with someone else. So, the time travel allows for a fresh start in the relationship.
One popular one might be those that explore how Naruto's new power of the Rinnegan changes his relationships in the harem. For example, it could show how he uses the Rinnegan's abilities to protect the various characters in his harem during battles, adding a new layer of drama and action to the story.
One implication is that he becomes much more powerful. The Rinnegan gives him access to powerful abilities like the Six Paths techniques, which would change the power dynamics in battles in the fanfiction. He could now face stronger enemies more easily.