Does anyone have any recommendations for a provider/providers who cater to more "goth" sensibilities (i.e., sharp teeth, split tongue, etc., although I realize the latter of these two is probably somewhat rare)? I am going to post this in other regional boards, as well, but wanted to start here as I am not opposed to traveling.

I have not seen her but a good friend has and swears by her. She certainly has the goth look.

I've spent some time with her already thanks though!

Robin Ardeur has a split tongue.
http://www.meetrobinardeur.com/
http://www.kinkycompanion.com/
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If you like Asians, consider a gumiho, nine-tailed fox.
http://en.wikipedia.org/wiki/Kumiho
No split tongue, but a kumiho or gumiho can freely transform into a beautiful woman that will often set out to seduce men, and eat their liver or heart.
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As legend has it, the problem is that after eating your liver she's hungry an hour later. (rimshot)

She was very pleasant in conversation but I never sessioned with her. From her pix in the link you posted it looks like she's slimmer.

Kat Black has a split tounge and uses it well

I forgot to include Robin Ardeur's TER Profile:
http://www.theeroticreview.com/reviews/robin-ardeur-220336