Yes, there are likely to be such fanfictions out there. The world of fanfiction is vast and diverse, with fans often combining elements from different fictional universes like 'Harry Potter' and the concept of the Rinne Sharingan from 'Naruto'. You can try searching on popular fanfiction websites to find them.
Well, it depends on the specific fanfiction. There are countless Naruto fanfictions out there. Some authors might decide to give Naruto the Rinne Sharingan to make him even more powerful or to introduce new plot twists. For example, it could be a result of some special training or a mysterious power transfer in the fictional world of the fanfic.
Saber is often a symbol of honor and power, and in relation to Rin, they can be written in fanfiction as two characters who grow to understand and respect each other more. Rin's knowledge of magic can be a key factor in their interactions. However, when it comes to lemon fanfiction, it's not a proper area to explore their true characters as it usually involves vulgar content.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including ones for Rinne and Sakura. Just use the search function on the site to look for them.
One great rinne and sakura fanfic could be a story where they go on an adventure together in a magical realm. It could explore their relationship as they face challenges and rely on each other's strengths.
There are quite a few. A lot of fanfiction authors like to explore the concept of Naruto having the Rinne Sharingan. It often leads to some really interesting plotlines. For example, some stories might have Naruto use the Rinne Sharingan to rewrite the history of the ninja world, or he could use it to gain new jutsu that were previously unavailable to him. It's a really cool concept that many authors have fun with.
It can also change Naruto's relationships. His friends might be in awe or even a bit scared of his new power. Enemies would surely target him more. Also, it could mean new story arcs. For example, he might have to deal with the dark side of the Rinne Sharingan's power, like being tempted by its overwhelming abilities. And he may need to find a way to use it for good without succumbing to its potential negative influences.
Adventure can also be a theme. They might go on a journey together in the fanfic, facing various obstacles and growing closer through those experiences. For instance, they could be on a quest to save their world or just exploring a mysterious place. Another common theme is self - discovery. As they interact with each other, they might learn more about themselves and their own feelings in the fanfic.
A possible fanfiction could be about the origin of the Rinne Sharingan having some connection to the world of RWBY. Maybe there was an ancient civilization in RWBY's past that had a similar power, and through some sort of dimensional rift, it influenced the development of the Rinne Sharingan in Naruto's world. This would involve a lot of world - building and exploration of both universes' histories.