Obviously, the female version of Tobirama would be a main character. The baby would also be a central figure. And perhaps some of Tobirama's old comrades like Hashirama could be important characters too. Hashirama might offer his support and wisdom to the female Tobirama during her time with the baby.
One possible plot could be that in a world where Tobirama has a female counterpart, she discovers she is pregnant. The story could then focus on her journey through the pregnancy while also dealing with the political and ninja - related challenges in the Hidden Leaf Village. She might face doubts from the villagers, but with the support of her friends and allies, she prepares to bring new life into the village.
One common theme is revenge. If something bad happened to her family or clan, she might be on a path of revenge. There's also the theme of leadership. As a strong female character, she could be taking on leadership roles in her clan. Additionally, friendship can be a theme. She might form deep friendships with other female shinobi or even male shinobi who respect her, which is a contrast to the often - male - only friendships shown in the original context.
Well, Mito Uzumaki could be a very popular supporting character. She was Hashirama's wife. In a fem Tobirama fanfic, she could be a friend or an ally to the fem Tobirama. Danzo Shimura might also be included. His shady nature and his different views on the village can create conflict and tension. And don't forget about Jiraiya. His flamboyant personality and his skills as a shinobi can add some humor and action to the story when paired with a fem Tobirama.
Well, in some fanfictions, Tobirama's character develops by learning from the mistakes of his past life. For instance, if in his past he was too strict with his rules, in his reincarnated form, he might be more lenient. He could also develop by forming new relationships that he didn't have in his previous life. Maybe he befriends someone from a lower social class in the ninja world and this broadens his perspective.
In a 'naruto and tobirama fanfiction' fight, it depends on the circumstances. If Tobirama was able to set up his water jutsu traps and strategies beforehand, he might be able to hold his own against Naruto. But overall, Naruto has shown the ability to overcome seemingly impossible odds and opponents much stronger than Tobirama. He has a wider range of abilities, from his Rasengan variations to his ability to sense and counter attacks. Tobirama would put up a good fight, but Naruto's power and experience from facing some of the toughest foes in the ninja world would probably give him the upper hand.
One of Tobirama's students, like Kakashi's father, Sakumo Hatake, could be a main character. He would be eager to prove himself by finding a way to heal his teacher. He could face many challenges and grow as a character throughout the process of trying to save Tobirama.
Yes, there are likely fanfictions with this concept. The Naruto fandom is vast and creative, and the idea of Naruto being Tobirama reborn is an interesting one that some fans may explore in their writing. However, the quality and availability of such fanfictions can vary greatly. You might need to search on popular fanfiction websites like FanFiction.net or Archive of Our Own to find them.
In fanfiction, anything is possible. So, Naruto could be Tobirama's reincarnation. Some fanfic authors like to play with the idea of reincarnation to bring new elements to the story. They might make Naruto inherit some of Tobirama's chakra nature or jutsu. This can create unique scenarios where Naruto has to deal with the memories or expectations that come with being Tobirama's reincarnation. It can also change the dynamics between Naruto and other characters, like Sasuke, as they might view Naruto differently if he has such a connection to an important figure from the past.
Tobirama would probably be both amazed and a bit skeptical at first. He'd be amazed at the power and convenience of modern ninja tools like explosive tags that are more powerful than the ones in his time. But he might be skeptical about relying too much on them, as he was used to more traditional ninja skills.