Power corruption is also a theme. In these fanfictions, Rukia might be exposed to a new kind of power that starts to corrupt her. Maybe it's a power that she thought was good at first, but as she delves deeper into it, it starts to change her for the worse. This can create a really interesting dynamic as she tries to fight against this corrupting influence while still dealing with the other challenges in the dark world she's in. The story then becomes about her journey to either overcome this corruption or succumb to it.
Another theme is isolation. The dark circumstances might make Rukia feel alone, cut off from her friends and allies. For example, she could be in a situation where she is the only one who can face a certain threat, and no one really understands what she's going through. This can lead to her feeling like she has to handle everything by herself in a very dark and difficult world. It also gives the writer a chance to explore how she copes with this extreme loneliness.
A common theme is friendship evolving into something more. Their initial respect for each other as comrades in Soul Society often develops into deeper emotional bonds in fanfictions.
Self - discovery is another theme that could be present. Rukia might be on a journey to understand herself better, her powers, and her place in the story's world. This self - discovery can be intertwined with the relationships she has in the fanfiction.
Friendship across universes is also a popular theme. Naruto and Rukia come from different fictional universes, so the idea of them forming a strong bond despite their differences is often explored. They learn from each other's values and ways of life, like Naruto teaching Rukia about the importance of never giving up in the face of adversity, and Rukia showing Naruto the more spiritual side of things.
One common theme is family. Since Byakuya is Rukia's adoptive brother in the Bleach universe, many fanfictions explore the complex family dynamics between them. It could be about Byakuya's over - protectiveness or Rukia's struggle to fit into the Kuchiki family.
The theme of sacrifice is quite common too. Renji may be willing to sacrifice his own well - being or position for Rukia's sake. Also, the theme of self - discovery. Through their relationship, they both discover new aspects of themselves. For instance, Rukia might discover a stronger side of herself because of Renji's support, and Renji might discover his capacity for deep love.
One common theme is the adjustment to married life. They come from different backgrounds, so seeing how they adapt to living together is popular. Another is the support they give each other in battles and in dealing with the various hierarchies in the Soul Society.
Growth is also a big theme. As they interact more, both rukia and tatsuki grow as individuals. For example, they might become more confident or learn new skills. And sometimes, there's a theme of sacrifice, where one is willing to sacrifice for the other in the story.
One common theme is the exploration of an unlikely relationship. Since they are from different groups in the original story, seeing how they interact and form a bond is popular.
Romance can also be a common theme. Writers might imagine a relationship between them, showing how they might fall in love, overcome obstacles together, and build a relationship. Another theme could be adventure, where they go on adventures together and their relationship develops during those experiences.
One common theme is the 'opposites attract' concept. Naruto is very energetic and loud, while Rukia is more reserved. Another theme could be about them overcoming differences between their two worlds. For example, Naruto's ninja world and Rukia's world of spirits.