There is no such appropriate fanfiction. In the Star Wars universe, which Anakin belongs to, there are certain values and moral codes. This kind of plot would completely shatter the integrity of the story and the characters, and it's not something that the fan community or the general public would tolerate.
Yes, there are many Naruto fanfictions that focus on positive family relationships. For example, some fanfictions explore Naruto's relationship with his father, Minato, and how Minato's legacy affects Naruto. Others might focus on Naruto's bond with his friends as an extension of his family. You can find these on fanfiction websites by filtering for family - friendly tags.
Yes, there are likely some 'Naruto Gets Pregnant' fanfictions out there in the vast world of fan - created content. However, such concepts often deviate from the original source material in very extreme ways.
It's a very bad and unethical idea. It might be the product of a person's deviant mind, but this has no place in the world of fanfiction. Fanfiction should be about building on the positive aspects of the original work, exploring character growth, relationships in a proper way, not creating such immoral and repulsive scenarios. In the case of Anakin, his story is about his fall to the dark side and redemption, not something as immoral as this.
He might discover a new type of chakra control method. His mother could have been an expert in chakra manipulation, and the scrolls could hold the key to a more advanced or unique way of using chakra, which would be a great asset for Naruto.
One potential antagonist could be those within the village who oppose Naruto's relationships. They might see his harem as a threat to the traditional values of the village and try to cause trouble for Naruto and his partners.
Another aspect could be how the village reacts to Naruto having a large family on the way. There could be both positive reactions, like seeing it as a sign of Naruto's strength and legacy, and negative ones, perhaps from those who are jealous or worried about the resources needed for such a large family. In this fanfiction, it might also explore the relationships between Naruto and each member of his harem as they navigate this new phase of their lives together.
This is a very disturbing and unethical concept. Incestuous relationships are not acceptable in society and violate basic moral principles. In the context of Naruto, which is a popular and family - friendly franchise, such a plot would go against the positive values it usually promotes.
I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide range of very creative and sometimes out - of - the - ordinary ideas, but this one seems rather unusual. You might try searching on some large fanfiction websites to see if it exists.
I'm not sure if there is a single 'popular' one in the sense that it's widely known. Fanfiction is a vast world with so many different stories. Some people might write this type of fanfiction for the shock value or to explore a different relationship dynamic. But it's likely that most Naruto fans are more focused on the canon pairings or more established fan - created pairings. So it might be a bit of a niche within the Naruto fanfiction community.