Yes, there are quite a few. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Some fanfictions might explore Naruto having a special connection to Tobirama's ideals or techniques, perhaps even having Tobirama as a mentor figure in a different timeline.
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.
Also, Tobirama was a master of space - time ninjutsu. Naruto has some experience with space - time with his teleportation jutsu, but Tobirama's were more advanced. Naruto would need to understand and master these complex techniques if he wants to truly fight like Tobirama. It would take a long time and a great deal of effort to reach that level of proficiency.
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.
Well, in such fanfictions, we might see Naruto taking on Tobirama's more serious and calculating nature. He could be involved in complex political situations in the village, much like Tobirama was. Also, there could be some cool crossovers with Tobirama's era and Naruto's, like Naruto interacting with Tobirama's contemporaries. This would add a whole new layer of depth to the Naruto universe and show how Naruto would handle situations in a more traditional and strategic way, rather than his usual impulsive style.
One implication could be a change in Naruto's abilities. He might gain some of Tobirama's water - based jutsu or his talent for creating complex ninja techniques. Another is in his relationships. The village elders might treat him differently, perhaps with more respect or suspicion depending on their views of Tobirama.
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.
It could be Orochimaru. He's always been interested in the power of the Senju clan and the first Hokage. With Hashirama being reincarnated, Orochimaru might see this as an opportunity to either steal his power or use him for some dark experiment.
One interesting plot could be the reincarnated Hashirama having to deal with the modern shinobi world's politics. He was used to a different era, and now he has to adapt and use his old - fashioned values to try and bring about change. Maybe he tries to reform the way the villages interact with each other, based on his original vision of peace.
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.