He could marry Mikasa from Attack on Titan. Just think about it. Naruto's positive and determined personality would contrast with Mikasa's more stoic and protective nature. They could meet through some sort of interdimensional accident. Naruto would be fascinated by the Titans and the world outside his own, and Mikasa might be intrigued by Naruto's ninja abilities.
In a crossover fanfiction, Naruto could marry Asuna from Sword Art Online. Naruto, being from a world of ninjas and battles, would find Asuna's skills in the virtual world of SAO quite interesting. They could get married after Naruto somehow gets trapped in the virtual world. His ninja skills would give him an edge in the virtual battles, and they could go on adventures together, fighting virtual monsters and building a relationship.
Perhaps Naruto could marry Kagome from Inuyasha. Given that both come from worlds with a lot of magic and supernatural elements, their relationship could be really interesting. Naruto could help Kagome in her quest to collect the shikon jewels with his ninja techniques, and they could fall in love along the way. Their marriage would be a union of two different but equally exciting fictional universes.
He could marry Hinata. Even though he's banished, Hinata might follow him because of her deep love for him. Their relationship could develop further outside the village, and they could get married and start a family.
He could marry Hinata. They have a pre - existing relationship in the original series. Hinata has always had feelings for Naruto, so it would be a natural choice. In the fanfiction, their relationship could progress more quickly, leading to an early marriage.
Maybe he marries an OC (original character). The author of the fanfic could create a whole new character with unique qualities that attract Naruto during his time away from Konoha.
Another possibility is that Naruto marries a completely new character. This character could be from a far - off land that Naruto visits during his departure from Konoha. She could be a powerful ninja in her own right, with unique abilities and a personality that attracts Naruto, leading to their marriage.
If it's a crossover with Attack on Titan, Naruto might be married to Mikasa. Given Mikasa's strong and protective nature and Naruto's never - give - up attitude, they could be a formidable pair. They would face the Titans together, with Naruto using his ninjutsu and Mikasa her combat skills.
One possible plot could be Naruto getting married to a character from another anime, like Sakura from his own world crosses over to the world of One Piece and marries Luffy. This would create a lot of chaos as Naruto tries to adapt to the new world while also dealing with his new relationship. He could use his ninja skills in the pirate world, and there would be a lot of comical and action - filled situations.
He could marry an original character created specifically for the fanfiction. This character could be a powerful mage from a far - off place who crosses paths with Natsu during one of his adventures.
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.
It could be a completely original goddess created by the fanfiction writer. This goddess might have unique powers like the ability to control the elements in a way different from the ninja in Naruto's world. She could be the goddess of light, for example, with the power to banish darkness and heal the sick.
There's a possibility that she marries a Pokemon ranger. A ranger who has saved Jessie from a dangerous Pokemon situation. He shows her a different side of the Pokemon world, the side of protecting and co - existing with Pokemon. And when they get married, all the Pokemon in the ranger's protected area come to celebrate and offer their gifts, like rare berries or shiny stones.