Well, perhaps the fanfic could focus on how their relationship evolves during the pregnancy. Rukia, being a strong Soul Reaper, might initially struggle with the idea of being more vulnerable due to the pregnancy. And Ichigo could be overly protective. They could also face opposition from the Soul Society, which adds a lot of drama to the story.
A great plot idea for this 'ichigo and rukia pregnant fanfic' could be that the pregnancy is a result of some sort of spiritual phenomenon. This could lead to the baby having special powers or a unique connection to the Soul Society and the human world. They would then have to figure out how to raise a child with such extraordinary circumstances, all while dealing with their own personal growth and the challenges of their relationship.
A possible plot is that Aizen uses his powers to send Ichigo and Rukia into an alternate dimension. In this dimension, they have to rely on each other to survive and find a way back. Along the way, they encounter strange beings and challenges that test their limits. They might also discover secrets about Aizen's past or his true motives for sending them there. This could be a journey of self - discovery for both Ichigo and Rukia as they face these new and difficult situations together.
Another plot could be that there's a powerful enemy who tries to use Rukia and Ichigo's feelings against them. They have to fight not only the external threat but also their own growing desires for each other, which leads to some tense and steamy moments in the fanfiction.
One popular plot idea could be an alternate universe where Ichigo and Rukia grow up together as normal humans and gradually discover their spiritual powers later in life. Another could be a time - travel plot where they have to go back in time to prevent a major disaster in the Soul Society. And a third could be a story where they are both sent on a secret mission to the human world together and have to pose as a married couple to blend in.
One idea could be that Ichigo and Rukia find themselves in an alternate universe where their roles are reversed. Rukia could be the one with the Shinigami powers from the start in Karakura Town, and Ichigo is a normal human who gradually discovers his own latent spiritual abilities to help her. Another could be that they are sent on a special mission together to a realm neither has been to before, like a dimension full of lost souls. There, they have to rely on each other more than ever to find their way back and complete their task.
One plot idea could be that Hollow Ichigo and Rukia are forced to team up against a new, powerful enemy that threatens both the Soul Society and the world of the Hollows. They start off distrusting each other but gradually learn to work together and understand each other's motives better.
One idea could be that Arrancar Ichigo has to protect Rukia from a new, powerful enemy in Hueco Mundo. Since he has Arrancar powers, he has a different fighting style and perspective, which could lead to some really intense battle scenes and a deeper understanding between them.
Yes, there might be some fanfics out there with such a plot. Fanfiction often explores different scenarios and relationships. However, it's important to note that these are fan - created works and not part of the official canon.
One idea could be that the baby has a unique power that combines Ichigo's Hollow powers and Rukia's Shinigami abilities. It could be a struggle for them to protect the baby from those who might want to use its power for evil.
One idea could be that Aizen kidnaps them to use Ichigo's power and Rukia's knowledge of Soul Society for his own dark plans. He might want to study Ichigo's unique Hollow - Shinigami powers up close and use Rukia as a bargaining chip with Soul Society.
One idea could be that Ichigo, Rukia, and Orihime discover a strange lemon - shaped spiritual artifact. They have to figure out its powers and how it relates to the Soul Society. Maybe it has the power to enhance their spiritual abilities, but also comes with a strange side - effect that changes their relationships in unexpected ways.