Her friends or comrades from the ninja academy or her ninja team can be main characters too. They might support her in battles or help her solve problems she faces in the story. For example, a loyal friend who always has her back during dangerous missions.
One great 'Kiyomi Uchiha fanfic' could be about her hidden powers. For example, she might discover a new jutsu that only she can use due to her unique Uchiha heritage. This could lead to her going on a solo mission to protect the village.
It could be Sasuke's sister, if there was one in the fanfiction world. She might share some of Sasuke's traits but also have her own unique personality that attracts Naruto.
Often, Naruto might be paired with Madara in some sense. Their opposing views on power and peace could create interesting interactions in the fanfiction.
It could be Sasuke. Since he is one of the most prominent Uchiha characters in Naruto. He has a strong connection to his clan's heritage and would be a likely candidate to be associated with a special Uchiha sword in a fanfic.
The main characters typically revolve around the Uchiha clan. It could be a fan - made Uchiha with extraordinary abilities that make them seem god - like. However, other important characters from the Naruto series also play a role. Naruto, as the protagonist of the original series, often has a significant part to play. His reactions to the Uchiha's god - like power and how he interacts with the Uchiha character are important aspects of the story. Additionally, characters like Hinata, Shikamaru, and others might also be involved in different ways, either as allies or opponents to the Uchiha in the fanfic.
Well, obviously Naruto and Sayuri Uchiha are the main characters. Naruto is the energetic and determined ninja from the Hidden Leaf Village. Sayuri Uchiha is a character created for the fanfiction, who is likely to be an Uchiha with her own set of skills and personality traits.
There might be a rival character. This could be another young ninja who is jealous of Sakura's new - found status as an Uchiha soldier. They could constantly challenge Sakura, both in terms of her skills and her place within the Uchiha - related military structure. This rivalry would add drama and tension to the story.
I think Naruto and Itachi could also be main characters in this fanfic. Naruto might look up to Itachi for his self - sacrifice and powerful abilities. Itachi could act as a mentor - like figure to Naruto in the context of the fanfic, guiding him in understanding the Uchiha clan better.
A new character could be created as the antagonist. For example, an Uchiha who has been corrupted by the power of the Sharingan and wants to use Naruto's special Uchiha - related abilities for his own evil purposes. This character could be jealous of Naruto's unique position within the Uchiha - related story and try to take it from him.