Well, it could be about Ichigo's journey within Xcution. Maybe it shows how he struggles to understand their motives and powers. He might form new alliances or face new enemies while being part of Xcution.
One aspect could be the psychological impact on Ichigo. If he's being brainwashed, he might lose his sense of self and his usual heroic nature. His relationships with his friends like Orihime, Chad, and Uryu could also be severely affected. For example, they might not recognize the brainwashed Ichigo and think he's turned against them. This could lead to some really intense and emotional scenes in the fanfic.
One thing that can make it interesting is the potential for character growth. Ichigo is already a complex character, but being part of Xcution could expose him to new challenges that force him to evolve. Also, the relationships he forms with the members of Xcution could be very different from what we've seen before. He might have to trust people he's not sure about, or deal with betrayal. All these elements can add depth and excitement to the fanfic.
A possible plot development could be Ichigo being made to fight against his former allies. Under the brainwashing, he might believe that his friends are actually his enemies. Another development could be Xcution trying to extract Ichigo's power while he's in this brainwashed state.
In this fanfic, perhaps it focuses on the friendship between Chappy and Ichigo. Chappy might help Ichigo in some unexpected ways. For example, Chappy could use her unique abilities to guide Ichigo through a difficult part of Hueco Mundo. Their bond could also be a source of strength for Ichigo during tough battles, giving him an extra boost of motivation.
Well, it could be about their adventures together after the main events in Bleach. Maybe they go on a mission to a new realm and face new enemies while strengthening their bond as friends and comrades.
Maybe Ichigo's death occurs due to a curse that he unknowingly activated. In the fanfic, this could lead to a whole new set of rules in the Bleach universe. His friends might then have to search for a way to break the curse and resurrect him. It could involve traveling to unknown realms or making deals with mysterious entities.
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.
One possible reason could be to gain more power. In the Bleach universe, the dead often possess unique powers or knowledge. By raising the dead, Ichigo might be seeking to learn from them or use their power to fight stronger enemies.
In a Bleach Ichigo hot spring fanfic, Ichigo could be on a mission near a hot spring. He decides to take a break and soak in it. While there, he overhears some important information from other characters who also happen to be at the hot spring. This information could be crucial for his mission, and he has to figure out how to use it without blowing his cover.
Perhaps the fullbringers are being controlled by a new, unseen enemy. This enemy wants Ichigo out of the picture, so they use the fullbringers to brainwash him. Ichigo, while brainwashed, starts to cause destruction in the Soul Society. His actions draw the attention of the Soul Reapers, who are initially unaware that he's been brainwashed. As the story progresses, some of the more perceptive Soul Reapers figure out what's going on. They then team up with Ichigo's friends from Karakura Town to find a solution. This could involve a lot of exploration of Ichigo's mind and his past relationships to find the key to breaking the brainwashing.