Some of them could be entertained. For those who are more open - minded, like Yoruichi, she might find it fun to see the different interpretations of their world and the characters in it. However, others, like Byakuya, might be more critical and think that the fanfiction distorts the original values and stories of the Soul Society.
Fem Ichigo would likely be a very influential figure in Soul Society. As Byakuya's mother, she would be part of the Kuchiki family. She could be involved in the family's decision - making processes, perhaps having a say in matters regarding family honor, alliances, and the training of the younger members. Her unique abilities, which we assume she has from being an Ichigo - like character, could also be used to protect Soul Society from threats. For example, if there are Hollows attacking, she could use her sword skills to fight them off.
At the start, Ichigo would be defiant. He would not show any fear in front of Aizen. He might taunt Aizen, trying to get him to reveal his true intentions. As time goes on, he would start to feel a sense of isolation, but this would only strengthen his resolve. He would use his inner Hollow powers more freely, as he has no other option. He would also be constantly thinking about ways to turn the tables on Aizen and escape, and would be ready to take on any challenges that come his way during his captivity.
Ichigo would likely be defiant. He's a fighter and would not easily submit to Aizen. He'd probably be constantly looking for a way to escape and would be sizing up Aizen's every move, trying to find a weakness.
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.
Some characters might be shocked at first. For example, her close male friends might feel a bit betrayed or confused, especially if they had a certain type of relationship with her when they thought she was a boy. But then they could come to accept and support her.
Ichigo might go into a state of self - reflection. He would wonder if there is something he has unknowingly done to cause this. He would try to analyze his past actions during the time travel. He might isolate himself from his so - called betrayers for a while to think things through. But ultimately, he would not give up on his friends. He would strive to find a way to regain their trust and set things right, because he values his relationships with them deeply.
If Ichigo and Yoruichi get married, it could change the power dynamics in Soul Society in many ways. Ichigo has human and Hollow powers, and Yoruichi has her own unique abilities. Their combined strength would be a force to be reckoned with. This might make the Gotei 13 more cautious about dealing with them. They could also inspire a new generation of shinigami to be more open - minded about relationships between different races, like humans and shinigami. Which in turn could lead to new power blocs forming within Soul Society.
The characters in DxD would be quite shocked at first. Ichigo's appearance and his powers are so different from what they are used to. For example, Rias Gremory would probably be intrigued by Ichigo. She might try to form an alliance with him, seeing his potential as a powerful ally. Issei, being the main character in DxD, would likely be both jealous and in awe of Ichigo's abilities, and might challenge him at first but then learn from him over time.
Korra would likely be very cautious at first. She's used to dealing with powerful opponents, but Hollow Ichigo's otherworldly nature would be something new. She might try to communicate with him, but if he showed aggression, she'd be ready to fight. Asami would probably be more strategic, trying to figure out his weaknesses. Mako and Bolin would be a bit more intimidated. Mako might use his lightning - bending as a first line of defense, while Bolin would be thinking of ways to use his earth - bending to either trap or slow down Hollow Ichigo.