So I've been revisiting FF8 and 9 and it just occurred to me that some of the optional bosses there have just enough mystery surrounding them to give rise to some speculation about their origins.
For instance, Ultima Weapon in FF8. That whole epic build-up to his arrival was just great and it makes me wonder where he came from and what really happened on the Deep See Lab.
There's also Hades in FF8. Apart from a cool look and battle music, he has that additional dialog if you've defeated Ozma.
"Wh-What!? You've defeated Ozma!? I've come too far to retreat. Onward!"
Hades is clearly a valiant warrior and blacksmith. As to why he's in Memoria, not sure.
So yeah. Have you ever given any thought to where the optional super powerful guys come from? I know some have readily evident explanations but I'm sure not all of them do.