Friendship is also a major theme. Just like in the original Naruto series, the Kuchiki character forms bonds with the characters in the Naruto world. These friendships help the Kuchiki character understand the new world better and also contribute to the overall plot development as they face challenges together.
One common theme is self - discovery. Harry often has to figure out his place in the new world or situation he's in. For example, in many fanfictions, he discovers new powers within himself that he didn't know existed.
One common theme is the exploration of different cultures. Since Byakuya is from a specific fictional world, when he crosses over, there's a chance to compare and contrast different settings and ways of life.
Power and status also play a role. Since Byakuya is from a noble family in the Bleach universe, the OC may have to navigate the power dynamics. Sometimes, the OC has their own unique power that either challenges or complements Byakuya's.
One common theme is power and leadership. Since Byakuya is a powerful character in the original Bleach series, in the fanfictions with a female version, she is often depicted as a strong leader. Another theme could be relationships, whether it's her family relationships or romantic ones. For example, how she interacts with her sister in a different light as a female character.
One common theme is the clash of different worlds. Byakuya is from a very structured and traditional world in 'Bleach', while the OC often comes from a different background, so exploring how they interact and adapt to each other's worlds is a big part of many fanfictions.
One common theme is the clash of different worlds. Since Byakuya is from a noble family in the Soul Society and the OC is often an outsider, there's the theme of how they bridge that gap. For example, in many fics, the OC has to learn the strict rules and traditions of Byakuya's world while also making him see things from a different perspective.
One common theme is the exploration of Byakuya's reserved nature. Since he is a very stoic character in the original series, fanfics often focus on how the reader can break through that exterior. For example, in many fics, the reader is shown to be the one who can make Byakuya show his more vulnerable side.
Isolation is also a theme. Byakuya is often portrayed as a rather aloof character. So in love story fanfictions, his journey from isolation to opening up to love is a common plotline. For example, he might start off pushing away the person he has feelings for due to his solitary nature, but then gradually let them in.
One idea could be a crossover where Byakuya Kuchiki is somehow transported to the Naruto world. He might initially struggle with the different chakra system compared to the reiatsu he's used to in his own Bleach universe. His stoic and disciplined nature could make him an interesting character to interact with the more exuberant Naruto characters.
One common theme is character relationships. For example, exploring the deepening friendship between Naruto and Sasuke, or Naruto's romantic relationships with characters like Hinata. Another theme is the expansion of the ninja world. Writers might create new villages, new ninja clans, or new jutsu. Also, the idea of alternate universes is popular, where the events in the original 'Naruto' series take a different turn.