In a fanfiction, Usagi Tsukino and Sasuke Uchiha could be brought together by a prophecy. They are both reluctant at first but as they face challenges like a powerful dark force that is trying to take over both the Sailor Moon world and the Naruto world. Their combined powers of Usagi's sailor crystal and Sasuke's Sharingan prove to be the key to victory. During this journey, a deep bond forms between them that goes beyond just friendship.
One plot idea could be that Usagi, with her lunar powers, gets transported to the Naruto universe. Sasuke, initially suspicious, gradually realizes she can be an ally. They team up to fight a common enemy that threatens both their worlds.
Well, Sasuke is a rather brooding character. Usagi, on the other hand, is very bubbly. Their relationship could start with Sasuke being dismissive of Usagi. However, when Usagi shows her courage and strength in battles, Sasuke would start to see her in a new light. As time goes on, they would share their past traumas and grow closer. For instance, Usagi could tell Sasuke about her struggles against the Dark Kingdom, and Sasuke could open up about his clan's massacre. This mutual understanding would strengthen their bond.
One plot idea could be the reborn character having all of Sasuke's memories from the start. This would allow them to quickly adapt and perhaps change some of the events that Sasuke went through in the original story. For example, they could avoid some of the more tragic moments or make different choices regarding his relationships.
One idea could be a fanfiction where Naruto and Sasuke have to team up again to face a new threat from an ancient evil that has been awakened. They have to put aside their past differences completely and combine their powers in a new way. For example, Naruto could use his Sage Mode along with Sasuke's Rinnegan to perform a super - powerful jutsu.
A great plot could be that Sasuke discovers a long - lost Uchiha technique and he and Sakura try to figure out how to teach it to their child in a safe and ethical way. It could involve a lot of family discussions and also some cool ninja training scenes. Or perhaps a story where the Uchiha family has to host a big shinobi gathering and Sakura has to deal with all the preparations while Sasuke is out on a mission, and then he comes back just in time to help her out.
One idea could be a crossover where Ayato Sakamaki, from the Diabolik Lovers universe, and Usagi Tsukino, from Sailor Moon, meet in a modern city. Ayato is intrigued by Usagi's positive energy and Usagi is both scared and curious about Ayato's dark allure. They could form an unlikely friendship and help each other face their respective challenges.
She could be a healer in the fanfiction. In the world of Naruto, healers are very important. Sasuke's sister OC could use her healing skills to help not only her friends but also enemies in need. This would create a lot of interesting situations where she has to make moral choices. For instance, should she heal a ninja from an enemy village who has information that could save her village? It would also put her in a unique position within the Uchiha clan as a valuable asset.
One great 'usagi tsukino crossover fanfiction' is 'Usagi Tsukino in the World of Harry Potter'. It's really interesting to see how Usagi's magical girl powers interact with the magic in the wizarding world. Another one could be 'Usagi Tsukino Meets the Avengers'. The idea of her joining forces with superheroes is full of potential for exciting storylines.
A significant theme is the idea of saving the new world she enters. Just as she protects Earth in the Sailor Moon universe, in crossovers she often finds herself in a position to help save the world she has crossed over into. This could involve fighting against new villains or resolving conflicts within that world. It shows her as a hero in different contexts and how her values are applied in various fictional settings.
You can try fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of fanfictions on various topics, including those related to Usagi Tsukino and Haruka Tenoh. Just use the search function and type in their names to find relevant stories.
A plot could revolve around their family planning. Maybe Sakura wants to start a family right away, but Sasuke is hesitant due to his past and the dangerous world they live in. This creates tension between them, and they have to work through their differences and communicate better. They could also face external pressure from the village elders regarding their family plans.