The main characters will most probably be Naruto and Sasuke as the title implies. However, other characters from the Naruto universe may also make an appearance. Characters like Shikamaru, who is known for his intelligence, could be involved in strategizing how to handle the situation after the fight. And Hinata, Naruto's love interest, might be there to support Naruto through his emotional turmoil.
Obviously, Naruto and Sasuke are going to be the main characters. Their relationship and how it develops after their fight is likely to be the central focus of the fanfic.
Naruto and Sasuke are bound to be the main characters in this fanfic. But also, their friends like Sakura, who has a deep connection to both of them, and Kakashi, their former teacher, could also be important characters. Sakura might be involved in the process of mending their relationship, and Kakashi could be the one guiding them towards a more positive future.