Ok, so. I've been having this idea floating around in my head ever since I first saw him.
Rhitahtyn Sas Arvina, the boss from Cape Westwind, used shields that have what seem like large 5- or 6-shot revolvers mounted to them. Once I saw him, and how his fight style works, I almost immediately thought, "Huh. That would make a pretty sweet tank class. I'd definitely play it." It would be a very unique class and, as far as I know, FFXIV is the only Final Fantasy game that has something like that.