What are some interesting plot ideas in 'ichigo meets rias fanfiction'?

In 'The Parallel Worlds' fanfiction, the plot twist is that Ichigo and Rias are actually from parallel universes that are starting to merge. They have to figure out how to stop the merge while also dealing with their feelings for each other. This creates a very unique and complex situation for them to navigate.

The main characters are Ichigo and Rias. Ichigo is from the Bleach universe, a powerful Soul Reaper with unique abilities. He has a strong sense of justice and is always ready to protect those in need.

Maybe fem Ichigo has a different set of powers compared to Ichigo. In the fanfiction, they could train together to combine their powers in a unique way. For example, her powers might be more focused on defense while Ichigo's are on offense, and they learn to complement each other. This could lead to some interesting character development as they overcome their differences and work towards a common goal.

Perhaps Byakuya loses his powers and Ichigo has to help him regain them. This role - reversal would be very interesting as Ichigo becomes the teacher and Byakuya the student. They would have to work together in a whole new way, and Ichigo would have to prove himself to Byakuya in a different context.

One idea could be their married life facing challenges from the supernatural world. Maybe a new powerful enemy emerges that targets their relationship. Another could be a story about their attempts to start a family within the context of the supernatural realm, with all the unique difficulties that would entail.

Maybe a story where their marriage is threatened by an old enemy or a new threat that emerges. They have to fight not only to protect each other but also to save their marriage. This could lead to some intense action scenes and emotional moments as they reaffirm their love for each other.

One idea could be Ichigo struggling to control his new vampire instincts while still trying to protect his friends. He might have to hide his vampiric nature from his family, which adds a layer of secrecy and tension.

One idea could be Ichigo having to face new and more powerful enemies in his resurrected form. Maybe he discovers new powers that come with this resurrection and has to learn to control them quickly to save his friends.

One idea could be a story where Ichigo and Candice are forced to team up during a Hollow invasion in a new, unknown dimension. They start off distrusting each other but gradually learn to work together as they face stronger and stronger foes.

One idea could be exploring how they deal with the reactions from their families and friends. Another could be the challenges they face during the pregnancy, like Ichigo's changing body and emotions.