Well, Naruto is a complex character. Initially, he may feel a sense of confusion. He might wonder why he is being forced when he has his own ideas about what he wants to do. He could also feel a bit of fear, not really knowing what being a ninja fully entails. He might be worried about whether he can meet the expectations that come with this forced role.
Naruto would face the challenge of self - discovery. Being forced into the ninja life, he has to figure out if he can actually find something positive in it. He also has to face the danger that comes with being a ninja. With his initial reluctance, he may not be as prepared as those who willingly entered this path. And there are the political aspects within the ninja world that he'll have to navigate, which can be especially difficult when he didn't choose to be part of it.
Well, often in fanfiction, Naruto's growth as a better ninja comes from his increased understanding of the nature of chakra. He might discover new ways to manipulate it, like fusing different types of chakra in a more efficient and powerful way. This could lead to him developing new and stronger ninjutsu, making him a more formidable ninja.
His relationship with Sasuke would likely become more strained. Since Naruto is forced to be a ninja, Sasuke might see him as being part of the system that he resents. Naruto's friends like Sakura would also be worried about him. They might try to find a way to free Naruto from whatever is forcing him to be a ninja. His relationship with his teachers, like Kakashi, would also change. Kakashi might be conflicted between following the rules that are forcing Naruto and protecting Naruto from harm.
At first, Naruto might be angry. He's put in a lot of effort to get into the ANBU and prove himself. So being forced out would feel like a slap in the face. He might go on a rant about how unfair it is.
Well, in many such fanfics, Naruto might achieve it through intense training. He could focus on mastering new jutsus, like some super - rare or advanced ones. Also, he might gain a deeper understanding of the ninja way, perhaps by facing and overcoming some really tough moral dilemmas.
At first, Naruto would be in disbelief. She has always seen Sasuke as a friend or a rival, not a marriage partner. So, she would likely be very vocal about her opposition. She might gather her friends, like Sakura and Kakashi, to support her cause. She could also try to appeal to Sasuke's sense of justice. Since Sasuke has his own code of ethics, he might also not be happy about this forced situation. Naruto could use this to try and find a way to break free from this unwanted marriage.
A plot twist could be that Naruto is forced to be a ninja not in the normal sense, but in a virtual reality created by an enemy. In this virtual world, if he fails as a ninja, something bad will happen to his real - world friends. So he has to quickly learn the rules of this new 'ninja world' which is full of glitches and strange challenges. Also, he could be forced to be a ninja by a curse that was placed on him. This curse makes it so that if he doesn't complete certain ninja tasks, he'll slowly lose his chakra or even his life. It would be a race against time for Naruto to figure out how to break the curse while still fulfilling his forced ninja duties.
In the fanfiction, Naruto might overcome his blindness through his extraordinary sense of hearing. He could learn to detect the slightest movements and sounds, using it to his advantage in combat. For example, he could sense the wind direction changes when an opponent attacks, and dodge accordingly.
Their partnership is a game - changer for Naruto's growth. Kurama's presence not only provides raw power but also a different perspective. Naruto has to learn to control Kurama's power, which means he has to master his own emotions and inner self. This self - control and the understanding of his inner power lead to his growth in ninjutsu, strategy, and overall as a shinobi.
The ninja community's reaction would be quite mixed. Some, like Naruto's close friends such as Shikamaru and Kakashi, would be supportive. They would likely offer their protection and assistance to Naruto during his pregnancy. However, there would also be those who are more traditional and might view Naruto's pregnancy as a weakness or something that goes against the norms of the ninja world. They could try to isolate Naruto or even oppose Sasuke's relationship with him because of it.