Yes, there could be many fanfictions exploring different relationships between Ichigo and Halibel. Some might focus on their friendship, or them as allies in battles. Fanfiction writers often come up with creative scenarios that don't involve the more extreme or inappropriate concepts like pregnancy.
Sure. A lot of fanfiction authors like to explore the more platonic or adventure - based relationships between characters. In the case of Ichigo and Halibel, they could be written as having a mentor - mentee relationship, where Ichigo teaches Halibel about the ways of the Soul Reapers, or vice versa. There are countless possibilities that don't involve the pregnancy concept.
Their powers could be combined in a way where Ichigo's Zanpakuto spirit, Zangetsu, and Halibel's water - based powers merge. For example, Ichigo could gain the ability to use water - enhanced slashes that have the cutting power of his normal attacks along with the fluidity of Halibel's water attacks.
Perhaps a plot where Ichigo accidentally ends up in Hueco Mundo near Halibel's territory. She initially sees him as a threat but then discovers that he has no intention of harming her or her fracciones. This could lead to an exploration of their different worlds and cultures within the Bleach universe.
In a post - war scenario, their relationship could develop into a mutual respect kind of thing. They've both seen the horrors of war, and they understand each other's strength. They might start to meet occasionally to exchange stories and advice on how to keep their respective groups safe.
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.
Another theme could be the exploration of their different worlds. Ichigo is from the human world and Soul Society, while Halibel is from Hueco Mundo. Fanfictions might delve into how they bridge the gap between these two very different realms, perhaps through mutual understanding and cooperation. This can lead to interesting stories about cultural exchange in a sense, within the 'Bleach' universe.
Often, these types of fanfictions also delve into the emotional side of things. Yoruichi might have concerns about being a mother, and Ichigo could be trying to figure out how to be a good father. Their friends in the Bleach universe, like Chad or Orihime, would probably be excited and offer support in different ways.
To develop their relationship, start with small interactions. For example, the OC could save Halibel from a surprise attack by other Hollows. This would make Halibel curious about the OC. Then, have them exchange stories about their lives. Halibel could talk about her rise to become an Espada and the OC could share their origin story. Another way is to give them a common goal, like protecting a group of innocent Hollows from a cruel Arrancar. Working together towards this goal would bring them closer.
For Ichigo, he could develop a more nuanced view of the Arrancars. Through his interactions with Halibel, he might realize that not all Arrancars are pure evil. This could make him more open - minded in his future encounters with other Hollows. As for Halibel, she could start to see the value in the Shinigami way, especially Ichigo's sense of justice. It might make her question her own loyalties and purpose.
There are likely many fanfictions about Tsubaki and Blackstar that don't involve pregnancy. You can start by looking on popular fanfiction websites. Search for their names and then filter through the results to find ones that focus on their adventures, friendship, or other non - pregnancy related aspects.
It could include how they break the news to their friends. Maybe they have a small gathering with their closest allies in the Soul Society, and everyone's reactions range from shock to extreme joy.