Well, one possible plot could be that Ichigo is turned into a neko by a powerful magical being as a form of punishment. He then has to learn to live with his new feline features while still trying to protect his friends and fight against the Hollows. Maybe he struggles with his new instincts like chasing after small moving objects at first, which could add some comical elements to the story.
His personality might become more curious, like a cat. He could be more easily distracted by shiny things or new scents. Also, he might become a bit more independent, as cats tend to be, but still hold onto his strong sense of justice and protectiveness for his friends.
One possible plot twist could be that Ichigo, now as a girl, has to deal with different power dynamics. Maybe her reiatsu (spiritual pressure) is affected in a new way. For example, it could become more refined or have a different color, which would attract different kinds of Hollows or Soul Reapers. Another twist could be in her relationships. Her friends might initially be shocked and not know how to interact with her. Uryu, for instance, might be more hesitant to be around her at first. Also, the Soul Society's reaction could be interesting. They might be suspicious of this change and think it's some kind of new threat or a trick by the Quincy. Overall, the story could explore how Ichigo's personality remains the same despite the physical change, but she has to adapt to the new social and power - related situations.
Well, her Zanpakuto's abilities might change. Zangetsu could have new powers that are more in tune with a female form. For example, it could have powers related to healing or protection in addition to its normal combat abilities. Her physical strength might be replaced with a more strategic and cunning approach to battles. She could use her surroundings and the enemy's weaknesses more effectively. And her connection to the Hollow inside her could also be different. It might be more of a partnership rather than a constant struggle for control, and this could lead to new combined forms with different power sets.
Her fighting style might become more fluid. Since, generally, female bodies have different centers of gravity compared to male bodies, she could adapt a more acrobatic and graceful fighting style. For example, she might incorporate more spins and flips into her attacks, using her new - found agility to her advantage.
I think his family would be the first to help. His sisters could bring him cold compresses to reduce the fever, and his father would use his medical skills. And from the Soul Society, Renji might come to check on him, as he and Ichigo have a sort of friendly rivalry. He would want to make sure Ichigo gets better soon so they can have their next sparring match.
Ichigo would also experience a period of sadness. He values his relationships, and when one is broken through betrayal, it would hurt him deeply. He might isolate himself for a while, brooding over what happened. But ultimately, he would use this experience to become stronger. He'd learn from it and be more cautious in future relationships, while still maintaining his core values of loyalty and trust.
His friends Orihime and Chad would probably be main characters. Orihime could be very motherly towards baby Ichigo, always making sure he's comfortable. Chad would be the strong protector, making sure no harm comes to the baby.
There could be some very strange and out - of - the - ordinary fanfictions out there that might have such a plot. However, this kind of plot goes against the normal character relationships and storylines in the original Bleach series. Usually, fanfictions tend to focus on more traditional themes like battles, friendships, and power - ups rather than such extreme and uncharacteristic situations.