In fanfiction, the merge could change Naruto's appearance. He might have some physical features of Kurama, like red eyes or some fox - like markings. Socially, it could make other characters view him differently. Some might be in awe of his new power, while others might be afraid. His relationships with friends like Sasuke could also change. Sasuke might see Naruto as a greater threat or as a more powerful ally depending on the nature of the merge.
Well, Naruto's mental state could be affected. Since Kurama has a very strong will, Naruto might have to struggle more to keep his own personality intact while merged. On the other hand, it could also lead to a deeper understanding between them, which in turn could result in Naruto being able to access Kurama's memories and knowledge. This could give him an edge in battles as he might learn about ancient fighting techniques or secrets of the ninja world.
One possible consequence is that Naruto's body might not be able to handle Kurama's full power all at once. It could lead to physical harm or even death if not managed properly. Also, his relationships with Sakura, Sasuke and others would be in jeopardy as they might not recognize the Naruto under Kurama's control.
Often, the story starts with Naruto realizing the potential of a full merge. Then he has to overcome some internal struggles. After the merge, he usually goes on a power - up spree. He might take on stronger enemies that he couldn't face before.
One consequence is a change in his physical strength. Kurama provided Naruto with a huge boost in power, so without it, he might not be as strong in terms of brute force. However, this could also force him to become more strategic in combat.
One possible plotline could be that Naruto, due to some external influence or his own preoccupations, fails to communicate with Kurama as he used to. This might lead to Kurama feeling lonely and neglected. For example, if Naruto gets involved in a complex political situation in the village, he might focus all his attention on that and forget about the bond he has with Kurama.
It could also be due to a misunderstanding. Suppose Naruto accidentally does something that Kurama misinterprets as a threat to its own existence. For example, if Naruto tries a new jutsu that Kurama wrongly perceives as an attempt to suppress it further.
One consequence could be that Naruto becomes too overconfident. With all this new knowledge, he might think he can handle any situation easily and take unnecessary risks. Another consequence could be that his relationships with his friends change. He might seem more distant as he delves deeper into the knowledge, spending more time on his own to understand it all. Also, there could be a power imbalance in the ninja world. If Naruto becomes too powerful too quickly, it could disrupt the existing power dynamics among the villages.
Well, Naruto might gain new and powerful jutsu. Kurama could teach him some unique chakra control techniques that no one else in the village knows. This would make Naruto even more formidable in battle.
One consequence could be that Naruto became extremely powerful all of a sudden. This newfound power might have made his enemies fear him more. For instance, the Akatsuki members who were after him might have had to re - evaluate their strategies.
One possible consequence could be that Naruto is ostracized by some in the ninja world. Since controlling blood is a rather strange and perhaps 'creepy' ability to some, they might view him with suspicion or fear. This could lead to him having to prove himself more often in battles and interactions.
His reputation in the ninja world could be damaged. If Padme spreads false information or reveals his secrets, other ninja might view Naruto differently. They could see him as a liability or a threat. This could lead to him being isolated in the ninja community, and he might have to fight harder to prove himself again.