The storyline could start with Naruto somehow ending up in Aizen's world. At first, he would be confused and on guard. But as he gets to know Aizen, he might see some potential in him. Naruto would try to change Aizen from the inside. Aizen, on the other hand, might see Naruto as a useful tool or an interesting experiment.
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.
There could be. Given the creativity of fanfiction writers, it's not at all surprising that someone might come up with a concept where Naruto has some sort of connection to Sosuke Aizen. It might be a story where Naruto, with his ninja skills, encounters Aizen's devious plans and tries to thwart them, or perhaps a more complex story where their powers merge in some strange way.
The Soul Reapers would be very confused at first. They are used to Aizen being a certain way, and Naruto's different personality would be a shock. Ichigo might be curious and see Naruto - Aizen as an ally against the common enemies. Orihime could be one of the first to trust Naruto - Aizen because of his kind - hearted nature that she would sense. And the Espadas would probably be on high alert, not knowing what to expect from this new Aizen.
They might have a mentor - student relationship. Aizen, with his vast knowledge and power, would be in the position of a mentor, guiding Naruto. Naruto, being eager to learn and grow stronger, would be the student. However, there could be some tension as Naruto has his own sense of justice which might conflict with Aizen's more self - serving motives at times.
Naruto would probably be very cautious around Aizen at first. He's used to facing powerful enemies, but Aizen's deceptive nature would be a new challenge. Aizen, on the other hand, might see Naruto as an interesting specimen, someone with a strong will and great power that he could potentially manipulate.
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.
Well, in a Naruto - Overwatch crossover fanfiction, Naruto's presence would shake things up. His determination and never - give - up attitude would inspire the Overwatch team. His ninjutsu could be adapted to fit the Overwatch universe. For example, he could use his chakra control to enhance the power of some of the existing Overwatch weapons. Also, his relationships with the other characters would be interesting to explore. He might form a strong bond with Tracer due to their similar energetic natures.
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.
Another idea is that Aizen somehow ends up in the Naruto universe during the time of the Fourth Great Ninja War. He could try to manipulate both sides for his own gain. But Naruto, with his ability to see the good in people, might try to reason with Aizen and show him a different path. It could be a story of redemption or a great battle if Aizen refuses.