A very emotional one is 'Hisana's Legacy'. It shows how Byakuya still holds onto Hisana's memory and how that affects his relationship with Rukia. The pain and longing that Byakuya feels are palpable throughout the story.
There is a fanfic named 'The Unspoken Ties'. In this, it focuses on Rukia's growth and how her connection to Byakuya and the memory of Hisana play important roles. It's a really engaging read as it explores the emotional depth between them. Rukia's journey of self - discovery while dealing with her past and present relationships is well - portrayed.
Another common theme is regret. Hisana's regret for leaving her sister is often a central point. Fanfics might show how this regret affects her relationship with Byakuya or how Byakuya deals with her past.
One common theme is family. Even though they are not related by blood in the traditional sense, Byakuya has been like a family figure to Rukia. So, fanfics often explore this family - like bond and how it affects their decisions. Another theme is loyalty. Both are loyal to the Soul Society, but their loyalty to each other can sometimes be in conflict with the rules of the Soul Society. This creates interesting plotlines in fanfics.
One great Byakuya Hisana fanfic is 'A Bond Beyond Death'. It beautifully explores their relationship and the unspoken emotions between them. The writing is very descriptive, making you feel as if you are in the Soul Society with them.
Love is a very common theme. Since their relationship was based on deep love, fanfictions often explore different aspects of their love, like how it started and how it endured. Another common theme is sacrifice. Hisana sacrificed a lot, and this is often explored in the fanfictions. For example, how her sacrifice affected Byakuya.
One possible plot could be that rukia and byakuya accidentally end up taking care of a baby. They initially struggle as they are not used to this situation. Byakuya with his strict nature tries to impose order while rukia is more lenient. As they care for the baby together, they start to understand each other on a deeper level and their relationship grows stronger.
One good storyline could be about their cultural differences within the Soul Society. Byakuya comes from a noble family with strict traditions, while Rukia has a more free - spirited approach. A fanfic could explore how they navigate these differences and learn from each other.
You can start by looking at popular fanfic platforms like Archive of Our Own (AO3) or FanFiction.net. On AO3, you can simply use the search bar and type in the names 'Byakuya', 'Ichigo' and 'Rukia' to get a list of relevant fanfics. FanFiction.net also has a good collection. Additionally, some anime - related forums might have threads dedicated to sharing and discussing such fanfics.
The fact that Byakuya was willing to risk his reputation and position for Rukia is very touching. When she was facing execution, he had an internal struggle. His loyalty to the Soul Society's rules was challenged by his love for her, and in the end, he couldn't just stand by and let her die.
Love is a very common theme. Their love story, which was complex and filled with sacrifice, is often explored in more depth. Another theme is loss. Since Hisana is no longer alive in the main Bleach storyline, fanfics often deal with Byakuya's sense of loss and how he copes with it.