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 be furious at being captured. He would resist any attempts by Aizen to manipulate him. He might use his spiritual pressure to test the boundaries of his prison. And he would be constantly thinking about how to turn the situation around. He would not let Aizen's presence intimidate him, instead, he would be biding his time, waiting for the perfect moment to strike back or make his escape.
At first, Ichigo might be in shock at being captured by Aizen. But soon, his determination would kick in. He would start to analyze his surroundings, looking for any means of escape. He might also try to engage Aizen in conversation, not just to buy time but also to understand Aizen's intentions better. He would be thinking about his friends and how they might be affected by his capture, which would fuel his will to break free even more.
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.
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.
Well, in a fanfic where these characters are captured, there could be a lot of intense situations. Maybe Aizen, being the crafty character he is, would try to manipulate the situation to his advantage. Ichigo, on the other hand, would probably be looking for a way to break free and fight back. And Irukia might be using his cool - headedness to assess the situation and come up with a plan. They could also be forced to work together against a common enemy in the fanfic, which would be an interesting dynamic considering their different personalities and powers.
Aizen might be initially dismissive, thinking it's just another mortal event. But as he realizes the potential power the baby could possess, he could become envious or see it as a new pawn in his schemes. He might start observing from the shadows, waiting for the right moment to make his move.
Rukia would be extremely shocked and disappointed. She has always seen Ichigo as a force for good, and seeing him side with Aizen, who is the main antagonist, would be a huge blow to her. She might try to talk Ichigo out of it at first, and if that fails, she could become his enemy.
A plot twist could be that the place they are captured in is not what it seems. It could be a magical or illusionary prison created by an unknown force. This would make their escape much more difficult as they have to figure out the true nature of the prison. Also, it could turn out that their capture was a self - fulfilling prophecy. Maybe Aizen's actions in the past led to a chain of events that resulted in their capture, but in a way he didn't expect. And Irukia could be the key to their escape, but he doesn't realize it until later in the fanfic.
Many of the captains would be on the edge of their seats. They'd be closely observing every move Ichigo makes. Ukitake might be silently cheering Ichigo on, hoping that he can succeed where they might have failed in the past against Aizen. And Hitsugaya would probably be analyzing Ichigo's techniques to see how he can improve his own skills.
Well, in 'ichigo and fem aizen lemon fanfiction', Ichigo is often the more emotional and impulsive one. His reactions to Fem Aizen's actions and presence are key elements. He might be drawn to her in a way that challenges his sense of right and wrong. Fem Aizen could be depicted as having a seductive allure that she uses to her advantage. She might also have a more complex backstory related to her femininity in this fan - created world. Her relationship with Ichigo is usually full of tension and a sort of forbidden attraction due to their different natures and the history between Aizen and Ichigo in the original Bleach storyline.
One idea could be that Aizen kidnaps them to use Ichigo's power and Rukia's knowledge of Soul Society for his own dark plans. He might want to study Ichigo's unique Hollow - Shinigami powers up close and use Rukia as a bargaining chip with Soul Society.
In such a fanfic, the power dynamics would be completely shifted. Ichigo might inherit some of Aizen's abilities or his strategic mind. There could be a whole new arc about Ichigo trying to break away from Aizen's shadow or even being forced to side with him at first. Also, the relationship with other characters like Rukia and his friends would be re - evaluated. They might be suspicious of him or try to help him come to terms with his heritage. The story could also delve into Aizen's side, showing a different, more fatherly side perhaps, which is a huge contrast to his cold - hearted villain self in the original.