In 1920, following the death of her brother, Jackson, Fiona was called by her family to take up the mask of the Hunter and destroy Demona. Ten years later, she succeeded in tracking The Demon to Paris. Teaming up with her old flame, Joshua Sweet, and the rest of Team Atlantis, she attempted to stop Demona from destroying Paris and thus end the hunt once and for all. Her mission failed. ("The Last")
As of 1996, Fiona was still living at the age of 107. By this time she has largely retired as a Hunter. She is also a member of the Illuminati, and participated in an effort to recruit her niece Robyn and the rest of the Redemption Squad into the Society. ("Losers")
In 1920, Fiona was a tall, Valkyriesque woman with blonde hair braided into a thick rope. She also has three small scars above her left eye, given to her by Demona. By 1996, she had aged much, but was hardly frail. She still wore her hair in a thick braid and bore the scars above her left eye.