I'm obviously far too obscure for my own good. The fandom was actually Babylon Five (though there's also a nod to The Man Who Was Thursday). Here are the headers:
Fandom: Babylon Five
Characters: OCs, Ulkesh Naranek
Rating: All ages
Word count: ~1900
Disclaimer: Ulkesh was created by J. Michael Straczynski.
Summary: In Victorian London, a working girl finds she's on the side of the angels.