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.
Fanfiction.net might also be a good place. There are many Sailor Moon fanfictions there. However, the quality can vary. Look for ones with high ratings and reviews to ensure a better reading experience about Usagi and Haruka.
One popular theme is friendship development. Since they are from the Sailor Moon universe, exploring how their different personalities interact and form a strong bond is quite common.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including those related to Haruka x Usagi x Michiru. Just search for the relevant tags, and you'll likely find a good number of stories.
Check out Sailor Moon fan communities on social media platforms. There are often groups dedicated to sharing and discussing fanfiction. Members can recommend their favorite Haruka and Usagi stories, and you might even find some exclusive works that haven't been widely published on other sites.
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.
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.
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.
One of the typical themes is the contrast between their personalities. Haruka is often seen as more cool and aloof while Usagi is bubbly. Fanfictions play with how these different personalities interact. Also, the theme of protecting each other is quite common, especially in stories where they face threats together.
One common theme could be the exploration of their relationship, whether it's a deep friendship or something more. Another might be their adventures together in different settings.
There could be a fanfiction where Haruka and Usagi are in a modern high - school setting. Haruka is the cool and mysterious new student, and Usagi is the friendly and popular girl. Their relationship develops as they work on a school project together, facing typical high - school drama along the way.
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.