CG Midlander

[Catapult]

Also, I actually think its highly possible that it's Siren in that poster of primals during the last IV live letter broadcast.

No. You don't make a list of elemental summons that includes ifrit and ramuh but excludes shiva. It would become a huge "WTF SE?" moment, especially given the emphasis on fanservice.

I seriously don't get this obsession with Siren. It started when the collector's edition box art was published, making people ask "who might that be" and snowballed from there (yes, I've been around that long to have witnessed this), but that has since turned out to be Garuda.

All the uses of the term "siren" in-game have not only been more mundane, but notably plural. If anything the sirens of yore, as supposedly slewn by Mistbeard decades ago, would be a class of the Sahagin tribe.

If you have to assign where our talent for the Echo came from, it is most logically the Twelve, or more specifically, Althyk the Keeper (of time and space).