One common theme is the power of friendship. Naruto often uses the bonds he has formed with his friends as a source of strength to defeat Sasuke. Another theme is self - improvement. Naruto typically has to grow and develop new skills to be able to overcome Sasuke.
One common theme is Naruto's growth. He often overcomes Sasuke because he has developed as a person and a ninja more than Sasuke. For example, in many fics, Naruto has a stronger sense of purpose and friendship which gives him an advantage.
One common theme is the struggle against fate. In Naruto, Naruto himself is constantly fighting against the fate that the village has set for him as a jinchuriki. In Angel Beats, the characters are all dealing with their past traumas and trying to find peace in the afterlife, which is also a form of fighting against their fates.
One common theme is competition. Naruto and Sakura are often shown competing in some form, like a ninja battle or a test at the academy, and Naruto comes out on top. Another theme could be growth. Naruto's victory over Sakura might be a catalyst for her to grow and improve herself. Also, friendship is sometimes a theme. Even though Naruto beats Sakura, it doesn't damage their friendship but rather strengthens it in some way.
Another theme is the power - up or new abilities. Naruto's already powerful ninja skills can be combined or compared with the abilities of the characters in Angel Beats. It's exciting to see how the characters develop new powers or use their existing ones in new ways in these fanfictions.
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.
In fanfictions about Naruto beating Sasuke in the Chunin Exams, the story could take a different turn for their relationship. Usually, Sasuke is the more skilled one in the early parts. But if Naruto wins, it could lead to Sasuke being more envious and determined to surpass Naruto in a different way. Naruto, feeling proud of his victory, might also be more motivated to keep getting stronger to maintain his edge over Sasuke.
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.