Fanfiction about Hollow Ichigo and Rukia: What are some interesting plot ideas?

Perhaps a plot twist where Dark Rukia discovers that Hollow Ichigo has a connection to her past that she was unaware of. Maybe he holds the key to unlocking a part of her memory that was sealed away, which changes their dynamic completely as they try to figure out what it all means.

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 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.

One idea could be exploring how Ichigo's hollow form affects his relationships with his friends. Maybe his hollow side makes him more aggressive towards them at first, but they gradually learn to accept and help him control it.

A plot could involve Ichigo being trapped in the Hollow world and having to find a way back. Along the way, he meets other Hollows with different personalities and motives, some of whom he befriends while others are enemies. He discovers secrets about the origin of Hollows and how it relates to his own powers.

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.

They could time travel to a period in Soul Society's history when there was a great war against a powerful enemy. Ichigo's modern fighting skills and Rukia's knowledge of Soul Society could be combined to change the outcome of the war. Or perhaps they travel to a time when Hollowfication was first discovered. They might be able to prevent some of the tragedies that occurred as a result of it. Also, they could time travel to an era where Quincy were more powerful and had a different relationship with the Soul Reapers. This could lead to new alliances or conflicts in the story.

One idea could be that their pregnancy is a result of some kind of magical or spiritual event in the Bleach universe. Maybe an ancient spell gone wrong or right, depending on how you look at it. For example, a spell that was meant to protect Soul Society actually ends up causing Rukia to become pregnant. Another plot could involve the two of them having to hide the pregnancy at first because it goes against some Soul Reaper rules or traditions. They then have to deal with the consequences of keeping it a secret while also preparing for the arrival of the baby.

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 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.