Quote Originally Posted by MsQi View Post
Head canon would be stuff that doesn't actually happen within the fictional context.

Games have to have flexible canon, because you have choices. Did the WoL become a Black mage or not? There is no absolute there. You are the WOL in your universe where I am just another adventurer. and vice versa.
Yes, "flexible" canon exists for gameplay reason, but that doesn't mean everything in the game is canon. There are optional contents that affect the MSQ or add to the lore of the world of Eorzea and there are other contents that don't.