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.
In this fanfic, Naruto might leave Konoha to protect his loved ones from potential threats in the village. When he gets married, it could be to a character like Hinata. They might start a new life in a peaceful place, away from the chaos of ninja battles. Maybe Naruto will teach his children the values he learned on his own journey.
One possible storyline could be that Naruto leaves Konoha to explore the world and on his journey, he meets a kind - hearted and strong - willed woman. They fall in love gradually as they face various challenges together. Eventually, they decide to get married. Maybe they have a simple ceremony with friends from his travels and old friends from Konoha coming to celebrate.
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.
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.
It could be a rogue ninja from another village who has a vendetta against Naruto. This ninja might spread false rumors about Naruto in Konoha, which eventually leads to Naruto leaving. So, this ninja would be the main antagonist as he is the root cause of Naruto's departure.
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.
Iruka could also be important. Since he was one of the few people who showed some kindness to Naruto in the original story. He might feel guilty about Naruto leaving due to neglect and set out to find him. His presence could add an element of emotional depth to the story as he tries to make amends.
It could be some of the more conservative village elders in Konoha. They might see Naruto Namikaze's unorthodox ways and growing power as a threat to their traditional way of running the village. So they create situations that make Naruto feel unwelcome and eventually lead to his departure, making them the antagonists in the story.
Another possibility could be a new character. For example, a foreign ninja who has different skills and a unique personality. She could meet Naruto during his travels, and they could share a deep connection based on mutual respect and admiration for each other's abilities. This could lead to them falling in love and getting married.