I mean, I suppose you could do it, if you wanted to. But there's no lore to support it, so it'd be 100% fanon. If it's fun for you, that's fine, but I wonder if you'd get enough players on board to make it really entertaining. In the past, when I played pen and paper games about vampires, the fun was mostly in their interactions with other clans of vampires. There are no vampires in FFXIV, so it'd really be a matter of getting a bunch of like-minded players to do vampire RP privately. But even so, like others have said, you might not find any because there's not much point in playing FFXIV for vampire RP when the setting doesn't support it in any way.
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AV by Kura-Ou
Wiki (Last updated 01/16)
My Balmung profile.
AV by Kura-Ou
Wiki (Last updated 01/16)
My Balmung profile.