River - I guess that could work. Keep it vague enough that when/if Square finally does reveal the other continents, she can fit in regardless. Good idea.
Magellan - It is possible, IMO, to keep a vague backstory and still build a solid foundation for a character. Barring Square releasing only locations that have very rigid lore and cultural lines and whatnot, more or less any character can be molded to fit whatever new nation fits them best.
Besides, it's Square. You know how they can't resist a very Ivalice-y place, if not Ivalice itself.
Magellan - It is possible, IMO, to keep a vague backstory and still build a solid foundation for a character. Barring Square releasing only locations that have very rigid lore and cultural lines and whatnot, more or less any character can be molded to fit whatever new nation fits them best.
Besides, it's Square. You know how they can't resist a very Ivalice-y place, if not Ivalice itself.