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.
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.
Another interesting plot could be a love story between them. In a fanfiction world, their dark natures might draw them together. They could struggle with their feelings while also dealing with the consequences of their existence in a world that often views them as outcasts. This would involve a lot of internal conflict and drama.
Hollow Ichigo's character development could involve him gradually learning to control his power in a more positive way. He could start to use his Hollow abilities not just for fighting but also for protecting. Dark Rukia could be developed by having her face the consequences of her dark actions. This could lead to a journey of self - discovery where she tries to find a balance between her dark and light sides.
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.
Well, a plot twist could be that one of them loses their powers right before the marriage. For example, if Ichigo loses his Soul Reaper powers, he might start to doubt if he can protect Rukia and their future together. Or perhaps Rukia is suddenly called back to Soul Society for an important mission that she can't refuse, and it's a mission that might keep her there for a very long time, putting their relationship to a hard test. Also, there could be a new character introduced who has a mysterious connection to either Ichigo or Rukia and tries to disrupt the wedding.
Well, Hollow Ichigo is wild and aggressive. Dark Rukia might be more brooding and reserved. In fan stories, their personalities could clash at first. For example, Hollow Ichigo might be impulsive and want to rush into a fight, while Dark Rukia would be more calculating. But as the story progresses, they could learn from each other.
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.
There are fanfictions where Ichigo and Rukia are in a modern-day high school setting. They still have their powers but have to keep it a secret. This type of fanfiction often focuses on their relationship development in a more normal, day - to - day environment, with some comical moments when they almost expose their powers by accident.
One interesting Ichigo and Rukia fanfiction could be about their adventures in a modern-day world where they have to hide their Soul Reaper powers. They might go to school together and face normal teenage problems while also dealing with Hollows that pop up in the city.