Well, the theme of transformation is quite common. The curse marks can physically and mentally transform Naruto and Sasuke. It can be a slow and painful process. Another theme is the search for a cure. Some fanfictions explore the idea that they want to get rid of the curse marks because of the potential danger they pose. But at the same time, they realize that the curse marks also give them an edge in combat and in protecting their village, so there's a conflict there.
One common theme is power struggle. The curse marks give them both great power, but they have to learn to control it. Another theme is the bond between them. The curse marks can be seen as something that ties them together in a unique way. For example, they might share similar experiences related to the curse marks that make their relationship more complex.
A prevalent theme is self - discovery. With the curse marks, Naruto and Sasuke have to figure out a part of themselves that they didn't know before. They also often face discrimination or fear from others because of the curse marks, which is another theme. This can lead to them feeling isolated at times and having to rely on each other more. And of course, there's the theme of using the curse mark's power for good or bad, which can create moral dilemmas for them.
One interesting fanfiction is 'The Curse Marked Bond'. It delves deep into how Naruto and Sasuke's curse marks affect their relationship. It shows how they struggle with the power of the curse marks and how it both unites and divides them at different times. They learn to control the curse marks together and use their combined power to face new threats in the shinobi world.
One type could be a fire - based curse mark. Given Sasuke's natural affinity for fire - style jutsu, a fire - based curse mark might enhance his existing abilities to an extreme level. It could make his fire jutsu more intense and uncontrollable at first. For Naruto, a wind - based curse mark could be interesting. Since he already has strong wind - style techniques, this curse mark might give him the ability to create more powerful and unique wind attacks, like a tornado - like jutsu with a dark twist.
The curse mark can change their physical abilities. For Sasuke, it might enhance his speed and strength, but also make him more prone to losing control. Naruto, on the other hand, might develop new chakra - related powers because of his exposure to Sasuke's curse mark. For example, he could gain the ability to sense the curse mark's energy better.
One common theme is redemption. Sasuke has done a lot of things that some might consider wrong, and in many fanfictions, Naruto is the key to his redemption. Another theme is friendship. Their bond is often explored in different ways, like how they support each other in tough times. Also, the idea of power and how they use it together or against each other can be a theme.
Another theme is redemption. Sasuke's actions in the original story make his path to redemption a popular topic. Fanfictions might show how Naruto helps him find his way back to the good side. For example, in some stories, Sasuke has to make amends for his past deeds with Naruto's support.
You can try some popular fanfic websites like Fanfiction.net or Archive of Our Own. Just search for 'Naruto Sasuke curse mark' on their search bars, and you might find some relevant fanfics.
One possible plot could be that they get the curse marks from a new, powerful enemy. They then have to figure out how to control the curse marks together without losing themselves to the dark power. Maybe they go on a journey to find a way to remove the marks while also facing challenges from other villages who see them as a threat because of the marks.
The theme of growth is very common. All three characters - Naruto (the adopter), Naruto (the younger self) and Sasuke - experience personal growth. They learn from each other, share their skills and knowledge. For example, Naruto might teach Sasuke some new jutsu, while the younger Naruto learns about the importance of friendship from Sasuke. This mutual growth is what makes these fanfictions interesting.
The theme of sacrifice also shows up a lot. Both Naruto and Sasuke are characters who are willing to sacrifice for the other in the original story, and this is often explored further in fanfiction. Writers might create scenarios where one has to make a big sacrifice for the other, which then tests and deepens their relationship.
Power and its limits is another one. In these fanfictions, we see them constantly testing their powers. Naruto might be trying to master new jutsus without losing himself. Sasuke could be grappling with the power of his Sharingan and how far he should go with it. Kakashi, with his Sharingan and his own unique skills, also serves as an example of someone who has learned to control and use his power effectively within certain limits.