There could be. Fanfics often explore really wild and creative ideas. Since both Naruto and Rukia are from very popular anime series, some fans might be intrigued by the concept of them being related. It would open up a whole new set of storylines, for example, how their different upbringings in their respective worlds would still lead to a brother - sister bond. Maybe Naruto would introduce Rukia to ramen in this fanfic world.
Naruto would probably be very curious about Rukia. He'd ask her a lot of questions about where she's from and what her powers are. Rukia, on the other hand, might be a bit guarded at first but would gradually warm up to Naruto's friendly nature.
One idea could be a crossover where Naruto and his friends are transported to the Soul Society. Naruto's positive attitude and determination might inspire the Soul Reapers in a new way. He could learn some of their techniques, and in return, teach them about chakra and his own ninja skills.
A fanfiction might explore the idea of Rukia training Naruto in the ways of soul reaper powers. Since Naruto is already a powerful ninja, learning new abilities could create a whole new level of strength for him. This could also lead to some interesting interactions between Naruto and the other characters in the Bleach series.
Naruto's loyalty and his belief in friendship can be deepened in the fanfic. When he meets Rukia, he could start to understand different types of loyalty, like Rukia's loyalty to Soul Society. Meanwhile, Rukia's sense of justice might be challenged and broadened by Naruto's more free - spirited approach to right and wrong. This interaction would lead to the development of both characters in new and interesting ways. Naruto might also start to show a more mature side as he realizes the weight of Rukia's responsibilities, and Rukia could become more in touch with her own emotions as she experiences Naruto's passion.
It would be quite interesting. There would likely be a lot of culture shock as Naruto comes from a world of ninjas and Rukia from a world of Shinigami. They would probably have to learn about each other's worlds. Naruto might be shocked by the existence of Hollows and Soul Reapers, while Rukia would be intrigued by Naruto's chakra and jutsu. Their relationship could start off rocky as they try to understand their new - found family connection.
Good rukia fanfic usually stays true to her character. For example, her strong - willed and kind nature should be maintained. It also often has an engaging plot, like a new adventure or a mystery she has to solve. For instance, a fanfic where she's on a quest to find a lost soul reaper power would be interesting.
Yes, it can be quite popular among fans who enjoy crossover fanfictions. The idea of bringing together characters from 'Naruto' and 'Bleach' (where Rukia is from) in a romantic context offers a fresh and exciting take on the characters. Fans like to explore how their different personalities, powers, and backstories would interact in a romantic relationship.
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.
Yes, there are quite a few. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'naruto and rukia love' and you'll likely find some interesting stories. Some might be more focused on adventure while also having a romantic sub - plot between them.