Quote Originally Posted by HisuianMiqote View Post
would it be possible for hydaelyn or someone else powerful in the ffxiv universe to summon a person from a world that isn't part of the source/shards (or other FF universes)? for example: if hydaelyn Really Wanted To could she summon someone from our earth to the source?
There have been several incursions form other FF universes to FFXIV's, and the reasoning more or less comes from the Dissidia games; they're a connected multiverse, with the Interdimensional Rift between them. The only figure that's ever done that intentionally is Exdeath, and even he only really took a step into the Rift rather than any further destination; generally speaking, the Rift is depicted as too chaotic and incomprehensible to be plausibly traversed with a destination in mind. Even the gods of the Dissidia games themselves don't bother with actually reaching across to other worlds, they just copy figures from them.

Earth isn't actually part of any of those (the ending of XIII-3 notwithstanding), but here's the funky part: we actually don't need it, because we also already have it. 2B and 9S came from Earth, somehow, and a few mentions of stars in both AST weapons and Ultima Thule suggest that cosmically speaking, we are in the same universe as Earth, and not far away at that. Really the main hurdle is that, if we assume 2B and 9S to have made the trip with no unstated time jumps, then Earth is ten thousand years in the future and eradicated by countless wars against machines.

But if you just want to do an isekai, don't worry about that. Anyone who wants to reject that character concept isn't really going to be swayed by deeply-considered lore justification, the concept itself is something you're either into or you're not. I would steer clear of using Hydaelyn, girl's too strapped for aether to really be taking that sort of a punt, but other than that you're in 'sure why not' territory. We had Clive turn up, why not an accountant from Santa Cruz?