Well, in the world of fanfiction, all kinds of wild ideas are explored. So it's possible that there is a fanfic where Ichigo is Aizen's son. But in the actual Bleach series, their characters are developed independently, with Aizen being a major antagonist and Ichigo being the main protagonist. Their story arcs and character backgrounds in the official story don't suggest any such family connection. It's really a creative and non - canonical idea that fanfic writers might play around with for the sake of creating new and interesting stories.
There might be fanfics out there with this premise. Fanfic communities are known for their creativity and bending of established lore. But in the Bleach anime and manga as we know it, Ichigo has his own family background with Isshin as his father. Aizen has his own role as a powerful and devious villain. The idea of Ichigo being Aizen's son is a radical departure from the original narrative. It could be an interesting concept in fanfic to explore how such a relationship would change the existing plotlines, character dynamics, and power structures within the Bleach universe.
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.
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.
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.
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 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.
You can try searching on popular fanfic platforms like Fanfiction.net or Archive of Our Own. Just use the keywords 'Aizen - Obsessed Ichigo Rukia' in their search bars, and you might find relevant fanfics.
Aizen might be motivated by power. Ichigo has a very unique power set that Aizen may want to harness for himself. And Rukia, being from Soul Society, could be used as a way to gain information or leverage against Soul Society.
One great fanfic where Ichigo is injured is 'The Road to Recovery'. It shows how his friends and allies support him during his healing process. The author does an amazing job of portraying Ichigo's struggle with his injury, both physically and mentally.
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.
One possible fanfic could be about Ichigo going to a hot spring to relax after a tough battle. He might meet some old friends there, and they could share stories and memories while enjoying the warm water.
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.