Only in that it was the one that one begins with in the game and who is a large factor in the main story - the other characters however take more of a leading role in the game, and each have their own storyline, which are given a lot more time than the characters in most post-XI games. XII's supposed main character (Vaan) played, relatively to the other characters in the story, a very small role, hence why I count that under the same category (albeit roughly).