Demiselle comes from Ireland, although she seems to make some interesting stops along the way. Her past is fairly muted, though it is implied that she once worked for The Order of the Golden Dawn. Well-versed in the art of warfare, Demiselle openly admits to being an assassin, but it is indicated several times that she was once a priestess, as well. When and how she fell from grace is still a mystery. Originally, she had no last name. Later, events in the verse changed that.