Well, in a fanfic where Aizen joins the Shinigami, he might actually have a change of heart. Maybe during his time away, he had an epiphany. He could start using his intelligence and powers to actually help the Shinigami. For example, he could help in researching new ways to purify Hollows more efficiently. However, his past sins won't be easily forgotten by all. There would be those who constantly keep an eye on him, waiting for him to slip up. And his relationship with other key Shinigami characters would be very interesting. He might form an unlikely alliance with someone like Urahara, and together they could come up with some revolutionary ideas for the Soul Society, but also with a lot of tension and mistrust underlying their partnership.
Aizen joining the Shinigami in a fanfic could lead to a complete change in the power dynamics. Since he is a very powerful character, his addition might disrupt the existing balance. He could start training some of the younger Shinigami in his own way, which might be a blend of his devious methods and the traditional Shinigami training. This could create a new generation of Shinigami with a different perspective. Also, his past actions and the knowledge he has gained from his time as an antagonist could be used in unexpected ways. For instance, he might use his understanding of the Hollow world to create a new defense mechanism for the Soul Society against Hollows, but with a hidden agenda that only unfolds later in the story.
Some characters like Ichigo would be extremely suspicious. Given his past battles with Aizen, he would not trust him easily. Ichigo might keep a close eye on Aizen's every move, waiting for any sign of his old devious ways to resurface. On the other hand, some of the more naive Shinigami might be easily fooled by Aizen's charm. They could see his joining as a great opportunity and welcome him with open arms, not realizing the potential danger.
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.
Well, a plot twist could be Batman's technology being hacked by an unknown enemy. Since he is known for his high - tech gadgets and strategies, if his systems were compromised, it would put the whole Justice League in jeopardy. Maybe the hack reveals some of Batman's deepest secrets, which could either cause a rift within the League or bring them closer together as they deal with the fallout. Another idea is that Batman discovers a long - lost relative who has ties to one of the Justice League's main enemies. This would create a moral dilemma for Batman and add a whole new layer of complexity to the story.
One possible plot twist could be that Draco has to constantly prove his loyalty to the Order. Since he was a former Death Eater, the members might be skeptical at first. For example, they could give him dangerous tasks to test his commitment. Another twist could be his relationship with Harry Potter within the Order. They might start as reluctant allies but gradually become friends, which would be a huge shift from their school - time enmity.
In this fanfiction scenario, if Naruto joins Aizen, it could lead to a complete upheaval of the existing power dynamics. Naruto's strong sense of justice would surely clash with Aizen's more self - centered motives. However, they could also find common ground in their pursuit of power, albeit for different reasons. Naruto wants power to protect his friends and village, while Aizen desires power for domination. This conflict and potential for cooperation would make for a really exciting story.
One possible plot twist could be that Naruto has the ability to control the souls of the dead, inherited from his mother, the Fem Shinigami. This could lead to him being able to communicate with past Hokages in a more direct way than just through their chakra imprints. Another plot twist might be that Naruto has to face an enemy who is also related to the Shinigami realm and his connection to it is the key to victory.
Well, it could be about Naruto having some special powers or abilities related to being the son of a Shinigami. Maybe he can communicate with the dead more easily or has some sort of death - related jutsu.
Well, he might make some new and interesting friends. For example, he could meet other characters with unique powers and personalities. He would also have to learn all the rules and regulations of the Shinigami world, which could be quite a challenge for him as he's used to his own way of doing things. And of course, there would be a lot of training involved, which would help him become an even stronger Shinigami.
One possible plot twist could be that Draco has a hidden agenda all along. Maybe he's actually trying to protect a particular Horcrux for his own reasons. Another could be that he discovers a new Horcrux that no one else knew about, throwing the whole hunt into chaos.
Well, one plot twist could be that Ash is actually a double agent. He pretends to join Team Rocket to gather information for the good guys. Maybe he discovers a big secret plan of Team Rocket, like they're planning to steal all the Pokeballs in a certain region. This would completely change the power dynamic and put Team Rocket on high alert.