One common theme could be redemption. Even though Naruto is 'destroying' Sasuke, it could be seen as a way to save him from a path of self - destruction. Another theme might be power struggle. The idea that Sasuke's pursuit of power has led him astray and Naruto, with his own power, has to put an end to it. Also, friendship could be a theme. Naruto might be doing this out of a sense of love for his friend, that he can't let Sasuke continue down this dark path.
The theme of consequences is often present. Sasuke's actions have consequences, and Naruto is the one to enforce those consequences. Another theme could be the cycle of hatred. Sasuke's actions are part of a cycle that Naruto wants to break, and by 'destroying' Sasuke in a sense, he is trying to end that cycle. Additionally, the theme of heroism is there. Naruto is seen as the hero who has to do the difficult thing of taking on his friend to protect the greater good.
One possible theme could be revenge. If the writer is bashing Sasuke, they might have Naruto seek revenge on Sasuke for his actions in the original story, like when Sasuke left the village. Another theme could be power display, showing Naruto's overwhelming power as he destroys Sasuke.
Yes, there might be such fanfics out there. In the Naruto fandom, with a large number of fans creating various types of stories, it's possible that some would write a story where Naruto destroys Sasuke in a way that could be seen as Sasuke - bashing. However, these kinds of fanfics may not be in line with the overall spirit of the original work which focuses on their complex relationship and growth.
One common theme is friendship. Their bond is often explored, from how it started to how it endures through all the difficulties they face.
Themes like loyalty are very frequent. Naruto's unwavering loyalty to Sasuke and vice versa is often explored. Family also plays a part. Given their complex family backgrounds, fanfics may touch on how they create a new kind of family with each other. And of course, the theme of rivalry - how they keep pushing each other to be better, even when they become friends.
Often, it might revolve around the idea of betrayal. Since Sasuke left the village, Naruto could be seen as taking extreme measures in the fanfic to make Sasuke pay for his betrayal. This could involve physical or mental torture. Also, themes of redemption might be present. Naruto might be trying to 'torture' Sasuke into seeing the error of his ways so he can be redeemed and return to the village.
One of the themes is growth. Naruto helps Sasuke grow both as a ninja and as a person. They might go on adventures together where Sasuke learns important life lessons from Naruto. Also, friendship is a big theme. Even though Naruto is in a more guiding role, their friendship deepens in these fics.
One common theme is the exploration of their deep - seated emotional bond. In many fanfics, the kiss is a physical manifestation of the intense connection they've had since childhood, which was often masked by their rivalry.
Common themes in 'naruto and sasuke brothers fanfic' include understanding. They try to understand each other's motives and feelings more deeply. For example, Naruto might understand Sasuke's need for power in a different way. Another theme is redemption. Sasuke, who has made some wrong choices in the original story, often has a path of redemption in these fanfics. And unity is also a theme. They come together to face common enemies or challenges, showing that together they are stronger as brothers.
Love is also a big theme. There are often stories about the love triangle between Naruto, Sasuke and Sakura. Also, redemption is common. Sasuke's actions in the original series sometimes need redemption, and fanfics often explore how he can make up for his past deeds. These themes are intertwined in many interesting ways, for example, love can be a driving force for redemption and growth in relationships.
Friendship is a big one. Often, these fanfics build on the strong friendship between Sasuke and Naruto and then develop it into love. Another theme is redemption. Sasuke's past actions and his journey towards redemption are intertwined with his feelings for Naruto.