Sasuke Uchiha is one of Naruto's finest fighters and among the most important characters in the story. Being an Uchiha, Sasuke was destined for greatness from the beginning, and the fact that he was a main character only made him that much more relevant. Kishimoto, Naruto's author, often describes Sasuke as the Yin to Naruto's Yang, meaning their importance to the story was almost equal and when one got stronger so did the other.