That's the beauty of FF6, any of the characters can be the main character if you want them to be. I always like the fact that no one character is the main character because it let's each person identify with the character that they want to be a main character.

Plus by not having the story spoon fed to you you can use your imagination to fill out the rest of each character's story that you never see in the game, which I think makes it much more enjoyable