1.0 actually had an NPC for a companion. You quested with them as part of the whole Path of the Twelve storyline with Minfilia.

I assume my companion died during the Calamity But it would be amazing if you had the option to be "reunited" with your 1.0 companion for characters that played back then, or to form a new relationship with a Cartenau survivor NPC even if your character wasn't part of that.