In addition to Naruto and Mito, sometimes other characters from the Naruto universe might also play important roles in the fanfiction. For instance, Hashirama Senju, who was Mito's husband. His relationship with Mito could be explored further in relation to Naruto. Or characters like Kakashi Hatake could be involved if the fanfiction is set in a time when Naruto is interacting with the current ninja generation while also having his connection with Mito.
There could also be original characters in some Naruto and Mito Uzumaki fanfictions. These original characters might be created to add more depth to the story, like a new villain who targets Naruto and Mito because of their connection to the Uzumaki clan and the Nine - Tails. Or a young ninja who looks up to Naruto and Mito and becomes their apprentice, adding a new dynamic to their relationship.
Well, obviously Naruto and Mito Uzumaki are the main characters. Naruto, the protagonist of the Naruto series, is a powerful ninja with the Nine - Tails sealed within him. Mito Uzumaki was the first jinchuriki of the Nine - Tails in Konoha. In fanfiction, they are often the central focus, whether it's about their relationship, their powers, or their roles in the history of the ninja world.
Since it's about Uzumaki Mito, she is likely one of the main characters. There might also be other characters from the Naruto universe like Hashirama Senju, as he was related to Mito. Maybe some of the early villagers of Konoha could be in it too.
The main antagonists could be a group of rogue ninjas who are after the secrets of the Uzumaki clan. Since Naruto is Mito's brother, they might target him to get to those secrets.
Another possibility is that there are some sort of ancient evil forces. Maybe there are dark entities that were sealed away long ago and Mito's connection to the Nine - Tails somehow awakens them. These forces could be more powerful than the normal ninja threats and would pose a great challenge to Mito and the Hidden Leaf Village.
I'm not sure specifically as there could be many different interpretations in fanfiction. It might be about Mito Uzumaki and some sort of fury - related situation in the Naruto universe, perhaps her showing great power or facing a difficult challenge.
In some naruto x mito fanfiction, Kurama, the Nine - Tails, can also be a significant character. Since Mito was the first Jinchuriki of the Nine - Tails, Kurama's presence and his relationship with both Naruto and Mito can add depth to the story. For instance, Kurama might share some memories of Mito with Naruto, which could change Naruto's perspective on certain things.
Obviously, Mito would be one of the main characters. Naruto might also be involved as it has 'naruto' in the title, and perhaps they interact in some important ways in this fanfiction.
A group of dark sorcerers who are envious of the Uzumaki's unique powers. They see Naruto's godlike state and Mito's sealing abilities as a threat to their plans of world domination. So they team up to try and take down Naruto and Mito before they can fully utilize their combined powers.
One possible plot could be that Naruto, as Mito's brother, discovers some long - hidden family secrets. Maybe he finds out about a special power that has been passed down in the Uzumaki family but was lost over time. He then embarks on a journey to rediscover this power and use it to protect the village in a new way.
A common theme is the power of love across time. Since Mito was from an earlier era, the fanfictions often explore how love can bridge that time gap between her and Naruto. Another theme is loyalty. They both have a strong sense of loyalty in the Naruto universe, and in the fanfictions, this loyalty is often a factor in their relationship.
There's a fanfiction that delves into the backstory of Mito Uzumaki when she's brought back by Edo Tensei. It reveals secrets about the Uzumaki clan that even Naruto didn't know. The author does a great job of integrating her into the existing Naruto plotline.