If shounen were a library, Sasuke wouldn’t just be a standout book. He’d be the very shelf on which all the others are organized. While deuteragonists like Vegeta, Bakugou, or Zoro (if you want to consider him one, which he actually isn't, but let's make an exception) shine in their own ways, Sasuke transcends comparison—because his narrative isn’t just a side story, but the thematic backbone of Naruto. He’s the deuteragonist against which all others are measured.