Maybe it's an original Uchiha character created specifically for the fanfiction. This character could have a combination of traditional Uchiha characteristics like the Sharingan and a more modern - day, kind - hearted nature that Naruto falls for.
There's also a possibility that it could be a distant Uchiha relative who has been living in hiding. Naruto stumbles upon her during one of his adventures and they gradually develop feelings for each other. Their relationship would then be a journey of discovery as Naruto learns more about the Uchiha heritage through her.
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.
In some versions of this fanfiction, perhaps the Uchiha Naruto marries is a long - lost relative of Sasuke. This would add an interesting dynamic as Naruto and Sasuke already have a complex relationship. It could also involve Naruto having to prove himself worthy to the Uchiha clan in order to marry into it.
Another possibility is Sakura. Although she has feelings for Sasuke in the original, in this fanfiction, the story could be rewritten so that she realizes her true connection with Naruto and they end up getting married at 12. Their dynamic would be quite different from the original, with Naruto having to prove himself in a new way to Sakura.
In some fanfictions, Naruto's mother might be a character related to the Uchiha clan in a unique way. It could be someone who was secretly in love with an Uchiha and had Naruto as a result. Maybe she was a long - lost relative of the Uchiha who was trying to protect the clan's secrets through Naruto.
One possible plot could be that Naruto discovers he has some Uchiha blood in him. This revelation would change his perspective on himself and his place in the ninja world. He might then start to train more intensively to master Uchiha abilities.
It could be a self - made queen from a far - off land. Maybe she is a powerful magic user who has united her land through her own strength and wisdom. When she meets Naruto, she is intrigued by his unique ninja abilities and they fall in love.
It could be an original character created specifically for the fanfiction. Maybe an empress from a far - off land that Naruto discovers during one of his adventures.
Maybe Tsukuyomi could be the goddess Naruto marries in fanfiction. Tsukuyomi is associated with the moon. Naruto, with his connection to the Nine - Tails, could have an interesting dynamic with a moon - related goddess. Her powers could help Naruto in controlling the Nine - Tails better or even give him new abilities related to the moon, like enhanced night - time combat skills.
The princess might be from a land that was once at war with the Hidden Leaf. Her marriage to Naruto could be a symbol of peace and unity. She could be a strong ninja in her own right, with skills in stealth and combat, and her personality could be a mix of grace and fierceness.
It could be a long - lost heir to a powerful, almost forgotten dynasty who resurfaces. This heir, being royalty, might have some special powers or knowledge. And Naruto, being the hero he is, could be drawn to her because of her unique qualities and the potential she holds for bringing about positive change in the world.
In this fanfiction, the antagonists might be a group from Koneko's world who oppose her relationship with an outsider like Naruto. They might fear that Naruto will bring chaos or change their traditional ways. They could try to separate them by any means necessary, including using their own unique powers against Naruto. Also, some of the rogue ninja from Naruto's world who are jealous of Naruto's new relationship could also cause trouble.