There are also fanfictions that focus on them facing challenges together. Maybe it's a threat that spans across their two universes, and they have to combine their powers and knowledge to overcome it. This theme allows for a lot of action and adventure in the stories.
One common theme is the exploration of their different worlds. Draco from the Harry Potter universe and Usagi from Sailor Moon have very distinct magical worlds, and fanfictions often play with how they interact.
Love and sacrifice is a common theme. Mamoru would sacrifice his time and energy to take care of Usagi. Another theme could be the power of friendship. Their friends would likely come to their aid during this difficult time. Also, the theme of hope. Despite Usagi being sick, there is always hope for her to recover and have a healthy baby.
Common themes include the power of love. In many fanfictions, their love is so strong that it can conquer all difficulties. There's also the theme of protection. Usagi is often depicted as protecting misaki from various threats, whether it's from jealous rivals or difficult situations. And the theme of acceptance is also prevalent, as they accept each other's flaws and grow together in their relationship.
One common theme is the clash and then the fusion of two different worlds. Harry comes from a world of wizards and magic, while Usagi is from a world of sailor senshi and lunar powers. Fanfictions often explore how these two disparate worlds interact and combine.
Love is a very common theme. Since Usagi and Mamoru have a strong romantic connection in the original story, fanfictions often expand on their love, like how they overcome obstacles to be together.
Some fanfictions may focus on the challenges they face during the pregnancy. This could involve health scares, financial concerns, or work - life balance issues. It's also common to see themes of love and commitment being strengthened through the experience of expecting a child together. The idea of building a family and the future they envision for themselves and their baby are often explored as well.
One common theme is friendship. Rei and Usagi have a strong friendship in the original series, and fanfictions often expand on that. They might go through challenges together and come out stronger.
Another theme is cultural exchange. Goku is from a more action - oriented, martial - arts - based culture in Dragon Ball, while Usagi is from a magical girl anime with a different set of values. Fanfictions may play with how they introduce their respective cultures to each other.
One common theme is the 'forbidden love' aspect. Since Jadeite is often an antagonist in the Sailor Moon universe and Usagi is the protagonist, their relationship goes against the natural order, which makes for an interesting and often angsty story. Another theme could be 'redemption'. Jadeite might be shown as trying to redeem himself through his relationship with Usagi.
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.
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.