One possible consequence is new and unexpected abilities. For instance, if his DNA is changed to incorporate some sort of spirit energy, he could gain the ability to communicate with the dead. Another consequence could be changes in his appearance, like his hair color or eye color changing. This can also lead to social isolation as his friends might not recognize him at first.
Naruto's view of himself and his purpose in life could also change. He might start to question his identity as the Jinchuuriki of the Nine - Tails. With new DNA - based powers, he could feel like he has a different role to play in the ninja world. He might explore new ways to use his powers for the greater good, which would be a significant development in his character.
One idea could be that Naruto gains new powers. For example, if his DNA was changed to have some Uchiha traits, he might be able to use Sharingan - like abilities. This could completely change the way he fights and strategizes in battles.
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.
If his education is sabotaged, Naruto may also face difficulties in understanding the complex political and social aspects of the ninja world. This could lead to him making wrong decisions or being easily manipulated by others who are more informed. He might struggle to form alliances or navigate the power dynamics within the Hidden Leaf Village and among other ninja villages. Moreover, his relationships with his peers could be affected as they might progress faster in their training while he lags behind due to the sabotaged education.
In fanfiction, it could also attract unwanted attention. If Naruto summons Rashomon in a public place or during a battle, it might draw the eyes of even more powerful enemies or villains who would then target him specifically because they see him as a threat with this newfound ability. For example, some secret organizations might see him as a potential tool or a danger to their plans and start to plot against him.
Well, in fanfiction, the Naruto and Kyuubi fusion could lead to a change in how the ninja world views Naruto. He would be seen as an even greater threat or an even more powerful ally. For example, other villages might be more hesitant to engage in conflict with him. Also, his relationship with his friends could be affected. They might be in awe of his new power but also a bit worried about the Kyuubi's influence on him. And on a physical level, his appearance might change, perhaps taking on some of the Kyuubi's features, like his eyes or his hair color getting a more reddish tint.
One consequence could be a strong backlash from the Naruto fan community. Fans who love the original positive themes of Naruto will likely be outraged. Another consequence might be facing legal issues if it violates any anti - hate speech laws or if it uses copyrighted Naruto elements inappropriately in the context of promoting Nazi ideology.
One consequence could be that it disrupts the natural balance. If Naruto isn't careful, his weather control might cause floods in some areas or droughts in others. For example, if he overuses his power to create rain, it could lead to excessive flooding.
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.