One common theme is the exploration of her relationships. It could be her relationship with her brother Hashirama, which might be different as a female. Maybe she offers more emotional support or has a different dynamic in family matters.
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.
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.
One popular fanfiction site to look for it could be Archive of Our Own (AO3). Just search for 'female Tobirama Senju' there and you'll find a variety of stories. Some might focus on her relationships within the Senju clan, while others could explore her role in the ninja world from a female perspective.
One popular Tobirama and Sakura fanfiction is 'A Meeting of Eras'. In this story, Sakura somehow gets sent back in time and meets Tobirama. Their interactions are really interesting as they come from different times with different values and abilities. It shows how they gradually understand each other.
One way is through their relationships. Tobirama had his own set of comrades and rivals. The OC could form different kinds of relationships. They could befriend outcasts that Tobirama might not have associated with. Also, the OC's reaction to modern technology or new ninja techniques could be different. Maybe Tobirama was traditional, but the OC is eager to adapt and combine old and new. The OC could also have a different sense of humor, which would show in their interactions with others.
Maybe Naruto starts using Tobirama's signature water jutsu more often. Tobirama was known for his powerful water techniques, so Naruto could mimic those, like creating large water dragons or using water to enhance his speed and mobility during combat.
One version of a Tobirama love story could be that he met a healer in the village. At first, he didn't pay much attention to her, but as he got injured more often in his dangerous missions, she was always there to patch him up. Her kindness and gentle nature started to attract him. Over time, they began to exchange more than just words about his injuries. They talked about their dreams, and Tobirama found himself looking forward to seeing her every time he came back from a mission.