The fem Naruto stands out as a very interesting character. Her character development can be really unique. For example, she might face different challenges in terms of romance and acceptance in the ninja community. Another interesting female character could be Anko. In these fanfics, she could be a sort of anti - hero figure who helps the fem Naruto in unexpected ways. She has her own dark past and secrets, and when she teams up with the fem Naruto, it can create some really exciting story arcs. And Tenten could also be a great character. She might get more spotlight in fem Naruto reincarnation fanfiction, showing off her skills and having more interactions with other female characters in a more prominent way.
Gaara could be an interesting addition too. Since he has his own complex backstory with power and isolation, he might see fem Naruto as a kindred spirit in a way. He could approach her to learn more about how she's handling the power and status, and perhaps they could form an alliance based on their unique positions in the world.
The main character who is reincarnated is often very interesting. They bring a fresh perspective to the Naruto world. Also, any characters that interact with the reincarnated one in a unique way, like an old - school ninja who is skeptical of this new 'reincarnated' concept.
Sakura is often a common supporting character. She can be a great friend or even a rival to fem Naruto in these fanfictions. Sasuke is also very common, as his relationship with Naruto in the original series can be re - imagined in interesting ways with a female Naruto. Kakashi could also play a crucial role, perhaps as a mentor to fem Naruto on her journey to become Hokage.
Naruto himself is obviously a key character in this type of fanfiction. Then there's Sasuke. Given his popularity and complex personality, he can add a lot of drama to the harem situation. Shikamaru is also likely to be part of it. His laid - back but intelligent nature can create interesting interactions with Fem Haku. Another one could be Gaara. His past and his new - found path of friendship could lead to him having feelings for Fem Haku in the fanfiction.
Definitely Harry Potter and Naruto themselves are very popular. People like to imagine Harry in the Naruto world using his magic skills and adapting to ninjutsu. And Naruto in Hogwarts, using his ninja abilities and his never - give - up attitude in the wizarding world. Hermione is also a popular choice. Her intelligence would be very interesting to see in the Naruto world, perhaps she could use her smarts to study chakra in a new way.
Often, the main oc character can become quite popular. If they have a really interesting backstory, like being a reincarnation of a powerful but misunderstood figure from another world, readers tend to like them. Also, characters who interact well with the original Naruto characters, like befriending Naruto himself or having an interesting rivalry with Sasuke, can gain popularity.
Rimuru is definitely one of the most interesting characters. As the protagonist who was reincarnated as a slime, his journey from a powerless slime to a powerful being is captivating.
The side characters who oppose the protagonist can be quite interesting too. They often represent the status quo or the forces that the protagonist has to overcome. Their motives and the lengths they go to stop the protagonist add depth to the story.
Definitely Iron Man. His charisma and technological genius make him a popular choice even in reincarnation fanfics. People like to imagine him coming back in different forms or with enhanced abilities.
Ruby is often very popular in RWBY Reincarnation Fanfiction. Her innocent yet powerful nature makes for interesting reincarnation scenarios. Fans like to explore how she would adapt if reincarnated with new powers or in a different situation. Weiss is also popular as her complex family background can be further explored in reincarnation stories. Another popular character is Blake, especially when it comes to exploring her past and how reincarnation could change or expand on it.