If you've ever played FF4 for PS, one of the preloaders has Kain
walking to the center of the screen,in sprite form, doing that
exact same pose with a small 'Final Fantasy' surrounding him.

I think Kain is the main character, because
if you do beat the game you can tell,
and they do show him with his helmet off,
just the back of him though, and in sprite form...
yes, Kain is blonde...