One possible plot could be that Ichigo is somehow tricked by Aizen. Maybe Aizen convinces Ichigo that by joining him, he can gain greater power to protect his friends in a different way. Ichigo, being naive in some aspects, might fall for this and start following Aizen's lead. This would lead to a huge shift in the power dynamics in the Bleach universe as Ichigo is a very powerful character.
The plot might revolve around Ichigo's quest for truth. Aizen, being the master manipulator, tells Ichigo that there are deeper secrets in the world of Bleach that the Soul Society is hiding. Ichigo, eager to uncover these secrets, joins Aizen. As they journey together, Ichigo begins to realize that Aizen's methods are not entirely ethical, but by then, he is already in too deep. This could lead to a conflict within Ichigo, whether to stay with Aizen or break away and face the consequences.
Yes, there are likely some fanfics with this concept. Fanfic writers often come up with unique and sometimes out - of - the - box ideas. However, this goes against the original storyline of Bleach where there is no such relation between them in the official canon.
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.
In the manga, it's a tough call. Both Aizen and Ichigo have their moments of power and strength.
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.
Ichigo ultimately defeats Aizen in a hard-fought battle.
Maybe Aizen has created a false asylum as part of a new experiment. He lures Ichigo and Rukia into it, and they have to find a way to escape while also dealing with the illusions and traps Aizen has set up. In the process, they could learn more about Aizen's motives and past, and perhaps even find a way to defeat him once and for all.
Ichigo would probably win. He always finds a way to overcome tough opponents.
Ichigo would probably win. He has that raw power and determination that could give him the edge over Aizen.
It's hard to say for sure. Both Ichigo and Aizen are incredibly powerful. Ichigo has his raw strength and determination, but Aizen is highly strategic and tricky.
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.