One possible plot could be them adjusting to married life while still dealing with the spiritual world threats. Maybe Ichigo is trying to balance his duties as a protector and a husband, and Yoruichi is using her experience to guide him in both aspects.
The main characters are obviously Ichigo and Yoruichi. Ichigo is the protagonist with his orange hair and powerful soul reaper abilities. Yoruichi is a former captain and a very skilled fighter with her cat - like form being quite unique.
Chad would be excited and happy for them. He's always been a loyal friend to Ichigo, and he would see Yoruichi as a great match for him. He might even offer to help with the wedding preparations.
They could be rivals at first. Hollow Ichigo is a powerful and chaotic force, and Yoruichi is a strong and independent character. Their initial meetings might be full of tension as they test each other's strength.
One possible plot could be that Ichigo and Yoruichi are thrown into an alternate dimension where they have to team up to find a way back home. Along the way, they discover new powers within each other and face powerful enemies together.
In fanfiction, the relationship between Ichigo and Yoruichi can be very diverse. Some may depict them as close friends with a deep bond. Yoruichi, being an experienced and powerful figure, often serves as a mentor or guide to Ichigo in many stories. Their relationship might also be portrayed with a sense of mutual respect and admiration, as they both have their own unique powers and personalities that complement each other in the fictional narratives.
One plot twist could be that they face opposition from the Soul Society. Since Ichigo is a substitute Soul Reaper and Yoruichi has a complex history there, the elders might try to stop the marriage for political or traditional reasons.
A plot twist could be that an old enemy of Yoruichi resurfaces, seeing their marriage as an opportunity to get revenge. This enemy could be someone from her past in the cat clan or a Shinigami she had crossed paths with before. Now, Yoruichi and Ichigo not only have to plan their wedding but also defend themselves and their loved ones from this new threat.
It could be a group of Quincy who have decided that Ichigo and Yoruichi are a threat to their new order. They believe that Ichigo's hybrid nature and Yoruichi's knowledge and power are things that could disrupt their plans to reshape the spiritual world. So, they start a campaign to eliminate them. This group of Quincy is led by a fanatical leader who is willing to do whatever it takes to achieve their goals, even if it means using dark and forbidden Quincy techniques.
Yes, there might be some out there. Fanfiction websites like FanFiction.net or Archive of Our Own could potentially have such stories. You can search for 'ichigo and yoruichi pregnant' on those platforms and see what comes up. However, the availability may vary depending on how popular this particular concept is among the fanfiction writing community.