Another theme could be jealousy. In some fanfictions, Byakuya might become possessive when he sees Ichigo getting close to other characters. This jealousy can drive the plot forward and lead to interesting interactions between the two. For example, if Ichigo spends a lot of time training with someone else, Byakuya might feel threatened and act in a possessive manner.
A third theme is the exploration of their power dynamics. Byakuya is an older and more experienced Soul Reaper compared to Ichigo. In possessive fanfictions, this power difference can be used to create a relationship where Byakuya is in control, but Ichigo may be challenging that control. This can lead to a complex and engaging relationship dynamic within the story.
One good place to start looking for such fanfiction is Archive of Our Own (AO3). There are many talented writers in the Bleach fandom who might have written possessive Byakuya x Ichigo stories. You can search using the relevant tags like 'Byakuya Kuchiki', 'Ichigo Kurosaki' and 'possessive' on the site.
Another theme is the idea of breaking boundaries. In the context of the Soul Society, there are rules and hierarchies. A fanfic might focus on how their relationship defies these, like Byakuya being from a noble family and Ichigo being a human - turned - Soul Reaper. It's about them crossing those lines for love.
Power dynamics can be a theme too. Byakuya is a very powerful Soul Reaper, and Ichigo also has significant power. Their relationship in fanfiction often explores how they deal with power imbalances, whether it's in battles together or in their daily interactions within the Soul Society or in relation to the human world.
One common theme is friendship. Despite their differences, they often form a deep bond in fanfics. For example, in many stories, they start off as rivals but gradually become friends who support each other.
The theme of friendship and trust also often comes up. Being thrust into a time - traveling situation together, Ichigo and Byakuya have to rely on each other. Their relationship might start off rocky, but as they face challenges in different time periods, they gradually build a stronger bond of friendship and trust.
A lot of these fanfictions also focus on how Fem Ichigo's femininity affects the story. For example, she might face different challenges or be treated differently in the Soul Society. And of course, there are often themes related to self - discovery for both characters. Byakuya may have to reevaluate his views, and Fem Ichigo may discover new aspects of her power and identity. This creates a lot of interesting plotlines that deviate from the original narrative.
One common theme is redemption. Byakuya may have things in his past that he feels he needs to make up for in relation to Rukia. Another theme is family. Since they are related in the Soul Society context, the idea of family and how it affects their relationship is often explored.
One common theme is loyalty. Their loyalty to each other and to their respective duties often plays a big role. They are both committed to their positions in their world, and this loyalty sometimes clashes with their personal relationship.
One common theme could be the theme of responsibility. For example, both Ichigo and Byakuya having to step up and take care of someone new, whether it's a new life or just a new situation that is like having a new 'life' in their group. Another could be the theme of friendship. Their friendship might be strengthened as they go through this new experience together.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. These platforms usually have a large collection of fan - created works, including ones about Female Ichigo and Byakuya. Just use their search functions and type in the relevant tags like 'Female Ichigo' and 'Byakuya' to find the fanfictions you're interested in.