In these types of fanfics, a frequent theme is the exaggeration of Sasuke's flaws. His actions might be blown out of proportion to justify his banishment. Also, there could be a theme of Naruto's superiority being emphasized, with the idea that he has the moral high ground and the power to make such a drastic decision regarding Sasuke. This can sometimes lead to a rather unbalanced view of the relationship between the two characters compared to the original Naruto series.
I'm not really into bashing fanfics as they often promote negative and unkind portrayals. However, you can try searching on popular fanfic platforms like Fanfiction.net or Archive of Our Own. Just type in the keywords 'naruto banished sasuke bashing' in their search bars and see what comes up.
They're popular because they offer a new take on the Naruto story. People like seeing how the relationship between Naruto and Sasuke changes when Sasuke is banished.
One possible plot could be that Naruto and Sasuke are wrongly accused of a serious crime against Konoha. For example, they might be framed for conspiring with an enemy village. As a result, they are banished. Naruto, with his unwavering spirit, might start thinking about how to prove their innocence from outside the village. Sasuke, on the other hand, could initially be more bitter and focused on getting revenge on those who framed them. Together, they embark on a journey to find the real culprits while also facing various challenges outside Konoha, such as dealing with other ninja clans who see them as outcasts and potential threats.
At first, Naruto is probably shocked and confused. He might not understand why the village would take such a harsh step just for hurting Sasuke. He may feel betrayed, especially if he thought he had friends and allies in the village.
One common plot element could be Naruto being unjustly banished from the Hidden Leaf Village. Then, in the crossover aspect, he might end up in a different world or situation where he has to prove himself. Regarding Sasuke bashing, Sasuke could be portrayed as a villain or someone who betrays Naruto more severely than in the original story.
I'm not sure of specific fanfics with this exact theme off the top of my head. However, you can try searching on popular fanfic websites like FanFiction.net or Archive of Our Own. Use the relevant keywords in the search bar to find stories that might fit this description.
There's also 'Sasuke's Exile: New Beginnings'. In this fanfic, the banishment of Sasuke leads to a whole new set of alliances and power dynamics. It's great because it delves deep into the characters' emotions and how they react to this unexpected turn of events. The crossovers in it add an extra layer of intrigue as well, like when characters from other anime worlds start to interact with the Naruto characters due to Sasuke's banishment.
Perhaps Danzo could be the main antagonist. He was always a bit of a shadowy figure in the original Naruto series. In this fanfic, he might see Naruto and Sasuke as a threat to his own control over Konoha. So, he uses his influence to have them banished. He could be secretly working with external forces to further his own agenda while keeping Naruto and Sasuke away from Konoha.
There could be an outside force, like a neighboring village that wants to keep Naruto and Sasuke away from their own village. They might be afraid of the potential power and influence Naruto and Sasuke could bring back if they return. So, this neighboring village sends their best ninjas to hunt down Naruto and Sasuke during their banishment, making them the main antagonists in the fanfiction.