The Soul Reapers in the Soul Society would see Ichigo as a major threat. They would likely mobilize their forces to either capture or eliminate him. Captains like Byakuya would be disappointed as he had come to respect Ichigo to some extent, and now would see him as a traitor.
Aizen ended up being confined and his powers were controlled. He was no longer a threat. This conclusion came after a long and intense battle, showing that justice prevailed in the Bleach universe.
Rukia would probably be very critical at first. Since she is quite serious, she might nitpick the inaccuracies in the fanfiction. But she might also secretly enjoy the ones that show her in a positive light, like those highlighting her friendship with Ichigo. In the Bleach universe, characters are used to their own stories, and fanfiction would be a whole new and unexpected take on their lives. The zanpakuto spirits might also have interesting reactions if they could read, as they have their own personalities and might be offended or flattered by how they are depicted in the fanfictions.
One interesting 'Bleach Female Aizen Fanfiction' could be where she has to navigate the complex power structure in Soul Society differently from the male Aizen. Maybe she uses her charm more subtly to gain allies. Another aspect could be how her relationships with other characters, like Ichigo, would change. Since she's female, the dynamic might be more of a mentorship or a different kind of rivalry.
He might become more empathetic. Seeing the past versions of characters he once used or manipulated could make him question his own motives. He could start to value relationships more, rather than just seeing people as pawns in his grand scheme. For example, he might try to protect characters he previously endangered during his time - traveling adventures.
At the moment of meeting Aizen, Naruto would be full of questions. He would wonder about Aizen's abilities, his goals, and why he is in Naruto's world. Naruto's first reaction would likely be one of excitement as well. He loves to meet new and powerful people. But as he starts to interact more with Aizen, he would begin to pick up on the more sinister aspects of Aizen's personality if they exist. Naruto would then have to decide whether to trust Aizen or oppose him. And this decision would be based on his own judgment of Aizen's actions and words, as well as any advice he gets from his friends in this fanfiction - based encounter.
Well, one possibility is that Aizen somehow convinces Ichigo that his way is the only way to protect his friends. Maybe he shows Ichigo a false future where all his friends die if he doesn't side with Aizen. Ichigo, being desperate to save them, might then join Aizen, thinking he can change things from the inside.
A popular trope in 'Bleach Female Aizen Fanfiction' is the 'Gender - Bending Consequences'. Since she's female instead of male, how does this change the power dynamics in Soul Society? Also, the 'Hidden Agenda' trope is often used. As Aizen, she's always scheming, but as a female, her hidden agenda might be related to issues like gender equality in the spirit world. And there's the 'Outcast' trope, where she's treated differently because she's a female with such great power.
Character insights. When a fanfic focuses on the characters' reactions, it allows readers to see deeper into their personalities. For example, seeing how Ichigo reacts to a new Hollow threat in a different way than in the original story can be very captivating.
One interesting plot could be Aizen traveling back in time to prevent his own downfall. He might use his knowledge of future events to outwit his enemies before they even become a threat. For example, he could manipulate the events that led to his discovery by the Soul Society, thus ensuring his continued rise to power undetected.