One possible plot could be that Ichigo and Halibel initially struggle to understand each other's worlds. Since Ichigo is from Karakura Town and Halibel is from Hueco Mundo. But as they spend more time together, they start to learn about each other's values and dreams. They might face opposition from their respective groups, like Ichigo's friends might be skeptical about his relationship with a former Arrancar. However, through their love, they gradually break down those barriers and build a new life together, perhaps even uniting the two worlds in some small way.
Well, it depends on what you consider 'good'. There are many out there, but the quality varies. Some might focus more on the action and power dynamics between Hollow Ichigo and Halibel, while others could explore a more emotional or romantic side of their relationship. It's best to read the summaries and reviews to find one that suits your taste.
Ichigo would develop a more patient side. Halibel's different way of thinking and her more reserved nature would force Ichigo to slow down and really think about his actions. He would also become more protective, not just of Halibel but also of the new relationship they are building. Halibel would start to open up more. She was always a bit of an enigma in the original story. But in this fanfiction, being married to Ichigo would make her more expressive. She would start to share her thoughts and feelings more freely, and her character would become more complex as she tries to balance her old self with the new self that is influenced by Ichigo and his world.
One common theme could be the exploration of their unique relationship. Since they are from different 'worlds' in the original context, fanfiction might play with how they interact and understand each other.
One common theme is power struggle. Given that both characters are quite powerful in their own rights, fanfictions often explore how they deal with each other in terms of strength. Another theme could be the exploration of the dark side of their personalities, as Hollow Ichigo is, well, hollow, and Halibel has her own complex nature.
I really liked 'Vasto Lorde Ichigo's Encounter with Halibel'. It's a shorter fanfic but it packs a punch. It focuses on a brief but intense encounter between the two. The dialogue is sharp and the action scenes are well - written. It gives a sense of the mystery and power that surrounds both characters. You should definitely check it out if you want a quick and exciting read about them.
One plot idea could be that Ichigo and Halibel are forced to team up against a new, powerful enemy that threatens both their worlds. They start off distrusting each other but gradually learn to respect and rely on one another's strengths.
A big challenge would be trust. Given their backgrounds as former enemies, it would be hard for them to trust each other at first. There could also be cultural differences between them. Ichigo comes from a more human - influenced world in the Soul Society, while Halibel is from the harsh and different world of Hueco Mundo. These cultural differences could lead to misunderstandings and arguments as they try to cooperate. Additionally, there could be external forces trying to keep them apart, like other Arrancars or Soul Reapers who don't want to see them together.
The contrast between Ichigo and Halibel makes it interesting. Ichigo is a hot - blooded and impulsive hero, while Halibel is more reserved and calculating. Their different personalities can create a lot of tension and drama in a fanfic.
There are quite a few 'ichigo x halibel' fanfics out there. Some focus on the power dynamics between them. For example, 'Power and Passion' shows how their different powers interact and how they come to respect each other's strength. It also delves into the cultural differences between their respective races in the Bleach universe and how they overcome those differences to form a connection.