I'll be looking forward to it.
ALSO, for clarity, as this thread sort of got derailed a little: By 'dark/mature', I didn't necessarily mean evil. Noel, with how I have her set up, would be true neutral. Sure, Eorzea's society is very friendly and militaristic, but there's still crime. Hell, in Limsa's opening you're attacked by pirates. Limsa Lominsa was founded BY pirates. The game even mentions that Ul'dah has its own underground black market and is no stranger to shadier things.
Rather than cultists, villains, and chaotic evil characters, I'm wanting to get in touch with thieves, outlaws, assassins, and etc.
I'm honestly very surprised at the answers here! And I'm glad there is so much support behind the idea! Perhaps with everyone so hesitant, I'm more inclined to jump at the chance to start my own community. I have a lot of learning to do.