Well, it really depends on how the fanfic is written. If the fanfic focuses on Naruto's weaknesses and Danzo's preparedness, Danzo could potentially win. He has a lot of political power and experience. However, if it follows the general power scale of the Naruto universe, Naruto has a better chance. His positive energy and the power of friendship (a bit cheesy but true in Naruto's world) often help him overcome his opponents. Naruto also has the ability to quickly adapt to new situations, which would be a big plus against Danzo.
Sasuke's character would likely become more complex. His act of killing Danzo could push him further into the realm of darkness or, paradoxically, start his journey towards redemption as he realizes the full weight of his actions. Danzo's character, in death, could be revealed in different lights. Maybe his true motives for his actions throughout his life are uncovered, which could affect how other characters view Sasuke's killing of him.
One possible plot twist could be that Danzo is actually being controlled by an even greater enemy. So, when Naruto is about to defeat him, he realizes that there's a bigger threat behind Danzo. Another could be that Danzo reveals a hidden power that he has been suppressing all along and suddenly becomes much stronger than Naruto expected.
One possible plotline could be Sasuke's revenge-driven journey leading up to the moment he kills Danzo. He might discover new secrets about Danzo's past misdeeds that fuel his hatred even more. For example, he could find out about Danzo's role in the Uchiha massacre in greater detail. Another aspect could be the aftermath of the killing. How does it affect the Hidden Leaf Village? Does it lead to chaos or a new understanding of Sasuke's motives among the villagers?
In fanfiction, Sasuke's realization of Sakura's pregnancy can be filled with drama. He might question his own ability to be a father. However, his love for Sakura would drive him to overcome his doubts. He could start learning about pregnancy and child - rearing, and his relationship with Sakura would become more affectionate and caring as they anticipate the arrival of their baby.
Naruto would probably be deeply hurt. He values his relationship with Sasuke so much that such a betrayal would shatter him. He might become withdrawn or angry.
I think young Sasuke would have a very intense reaction. He was so consumed by his hatred for Itachi at that young age. A Sasuke vs Itachi fanfiction would be like a trigger for him. He would be eager to see how the fictional fight is portrayed. If Sasuke in the fanfiction is shown as strong, it might fuel his own ego and make him strive even harder to become powerful. However, if the fanfiction shows Itachi as superior, it could enrage him. He might feel that it undermines his own goal of defeating Itachi and he might even want to find the writer to correct their 'wrong' view.
A good Spiderman vs Batman reaction fanfiction should have well - developed characters. It should stay true to the essence of both characters. For example, Spiderman's quippy nature and Batman's brooding seriousness. The plot should be engaging, not just a simple fight. Maybe there could be a misunderstanding that leads to the conflict. And the setting can add a lot to the story too. If it's set in a shared universe where both heroes have to deal with new threats while also facing each other, that could be really interesting.
I think Spiderman would have an edge in a fight against Batman. His powers are more innate. He can swing from building to building effortlessly and has a much stronger physical strength compared to Batman. Batman is just a human, albeit a very well - trained one. In the fanfiction world, though, the story could be twisted to make Batman's gadgets and strategic mind overpower Spiderman. But overall, Spiderman's natural abilities give him an upper hand.
I like Naruto in these fanfics because he always stays true to his beliefs. He is constantly trying to bring Sasuke back to the village and is willing to fight for their friendship.