Well, characters who had a rough start in the village due to Sandaime's decisions might be likely to support the bashing. For example, Naruto himself could be one. Given his difficult childhood with little support from the village at first, which some might blame on Sandaime, he could be portrayed as having negative feelings towards him in these fanfictions.
In 'naruto sandaime bashing fanfiction', a frequent theme is his political decisions. His choices in maintaining the power structure within the village can be a target. For instance, some might write that he was too lenient with the powerful clans, which led to an imbalance. And his actions during the various ninja wars might also be criticized, like his military strategies or his decision - making processes that might have cost many shinobi their lives.
One common theme could be criticizing the decisions made by the Sandaime Hokage. For example, his handling of the Uchiha situation might be a point of contention in such fanfics. Another theme could be exploring how the village would have developed differently if he hadn't been in power or had made different choices.
Naruto himself could be a main character as the fanfic might explore how his life could have been different without the Sandaime's influence. Another likely main character could be Orochimaru, especially if the fanfic focuses on the Sandaime's failure to deal with him properly.
Naruto would probably be extremely hurt. He has always looked up to the Sandaime as a grandfather figure. So, he might initially go into a state of shock and disbelief.
In a fanfiction where the Sandaime survives the Chunin Exams, Konoha would be a very different place. His wisdom and experience are invaluable. He might be able to prevent some of the internal strife that occurred after his death. Naruto would probably grow even faster under his continued guidance. And the relationship between the different ninja clans might be more stable with his leadership still in place.
In a 'Naruto son of Sandaime' fanfiction, the story could center around the relationship between Naruto and the other clans in the village. As the son of the Sandaime, they might view him differently. Some clans could try to befriend him for political reasons, while others might be jealous or suspicious. Naruto would have to navigate these complex relationships while also dealing with his own growth as a ninja and his desire to be recognized for his own merits, not just because of his father.
Perhaps in the fanfiction, the Sandaime betrays Naruto by revealing his secrets to the wrong people. Like, he tells about Naruto's connection to the Nine - Tails in a way that endangers Naruto. It could be because the Sandaime is trying to protect the village at all costs, even if it means sacrificing Naruto's well - being and trust.
Well, Naruto might become extremely powerful. The Sandaime Hokage has a wealth of knowledge and skills. He could teach Naruto some very unique jutsu and also help him better understand the values of the village. Maybe Naruto would grow faster in terms of combat skills and leadership abilities.
Not really. Since Naruto has a huge and dedicated fan base who love the character, Naruto bashing fanfiction is not as popular as positive or canon - compliant fanfiction. Most fans enjoy stories that build on Naruto's heroic journey rather than tearing him down.