One potential character could be a new - genin who has blood - bending abilities but is from a family with no prior history of such powers. They would be an outcast in their own family and among their peers. Another could be an older, jaded ninja who lost their way and turns to blood - bending as a last resort to gain power. And of course, a mysterious figure who seems to be a master of blood - bending and is secretly pulling the strings in the background of the Naruto world.
Naruto himself could be a likely main character. Given his determination and his ability to make friends, it would be interesting to see him in a harem situation within the Blood Prison. He could use his ninja skills to protect the harem members and try to break free from the prison's mysteries.
One idea could be a character who discovers they have blood - bending abilities in the Naruto universe and has to hide it from their village at first. Maybe they are from a non - water - based village and fear being ostracized. Another plot could involve a blood - bender using their power to heal instead of harm, which goes against the traditional view of blood - bending in other fictional universes. A third idea might be a blood - bender who gets caught in the middle of a war between two great ninja powers and has to decide which side to use their power for.
Definitely Sasuke. He has a complex relationship with Naruto, and in a gender - bender situation, that relationship could take on a whole new romantic dimension. Sakura could also be in the harem. She has always had strong feelings for Sasuke, but with Naruto's new form, she might develop different feelings. And then there's Hinata, who has always been in love with Naruto, and this gender - bender concept could add more depth to her feelings.
Sasuke could be one. He already has a strong sense of focus and discipline, which could be transferred to his musical pursuits. He might be a prodigy in playing some traditional shinobi musical instruments and use the music as a way to enhance his Sharingan abilities.
Obviously, Naruto is the central character as the one whose gender is changed. Sasuke is often a part of the harem, his brooding nature adding an interesting dynamic. Sakura might also be included, but in a different role, perhaps as a friend or a rival to the female Naruto. Kakashi could also show up, being a mentor figure who has to deal with this new situation.
A vampire scientist. This character could be researching ways to create a new type of vampire that is immune to the weaknesses of traditional vampires, like sunlight or silver. Their experiments could cause a stir among both the vampire and lycan communities.
Well, Naruto himself could be a part of it. His determination and unique abilities might draw the attention of the Saiyan or vice versa. Sakura could also be in the harem, with her medical ninjutsu skills and strong - willed personality. And of course, Sasuke. His cool and powerful Uchiha abilities might make him an interesting addition to the group interacting with the Saiyan.
Another potential character is Harry Potter. His wizarding skills and knowledge of magic could be a contrast to Naruto's ninja abilities. Imagine Naruto in Hogwarts, learning about magic while also showing off his ninja moves. They could also face a threat together, like a dark wizard who is trying to use both magic and chakra for evil purposes.
For Naruto side, Sasuke could also be a character in this fanfiction. His cool and mysterious demeanor might draw the attention of Skyrim characters. In Skyrim, there's Serana. She is a vampire with a complex personality, and she could be interested in a Naruto character. Additionally, Ysolda, the young merchant in Whiterun, could be part of the harem as she is friendly and open - minded, and might be attracted to the unique qualities of Naruto characters.
Boruto is an obvious choice. He and Sarada have a unique friendship in the Naruto universe, and their interactions can add a lot of depth to the story. They could go on missions together or have friendly competitions.