- "I know what you'd say. That after all these years we're still using people. All we're doing is helping them play the roles they so desperately want."
- ―Sophronia Fairweather[src]
Sophronia Fairweather, more commonly known as Sophie, was a witch and the sister of Lavinia and Edna. Unlike their sister Edna, Sophie and Lavinia didn't join the Watchers' Council and chose to use their talent for magic to preserve their youth and pursue hedonistic, carefree lives.
By the time their grandnephew Rupert was a young boy dreaming of becoming a fighter pilot, Sophie and Lavinia approached Edna and her son to ask them for the Shard of Stronnos, a mystical artifact that could convert matter into energy and viceversa, so they could restore their lovers, which an unidentified light demon had transformed into beings of light and trapped in mirrors.
Edna gave the Shard to Sophie and Lavinia after young Rupert intervened and inadvertently made the light demon corporeal, and vulnerable to be killed.
Decades later, following the end of magic, Sophie and Lavinia sought the help of Angel and Faith to protect them from a large number of demons with whom they had made deals to remain eternally young, beautiful and athletic. The end of magic gave these demons the chance to demand the debts to be payed.
The two had also heard of Angel's plans for resurrecting Rupert and used the Shard, which they had kept for decades, to restore a Rupert's essence as a child and his innocence, which, according to Lavinia, he had lost the moment he activated the Shard's power.
Sophie and Lavinia stayed at Rupert's manor, though each of them had a different agenda. While Lavinia supported Angel's plan to resurrect Rupert, whom she considered necessary for the world, Sophie feared the possible consequences of Angel's plan and told Faith to stop the vampire should he go too far.
Both Sophie and Lavinia also became acquainted with Willow Rosenberg during her time with Giles and the Devon Coven while she was recovering from her addiction to dark magic. Left behind with her sister while Angel and the gang are journeying to Quor'toth, Sophie is faced with Whistler, Pearl, and Nash. Looking for Angel, Whister tells them to inform him of his arrival so he could talk with him once he returned.  The sisters were also present for to help Angel, Faith and Alasdair Coames to ressurect their nephew. When Whistler manage to launched a magical plague who affect and mutate mass people, they help by rescuing and guiding people on their new powers.
- Live Through This, Part One (only in portrait)
- Live Through This, Part Four (only in portrait)
- Women of a Certain Age
- Family Reunion
- Death and Consequences, Part One
- Death and Consequences, Part Two
- Death and Consequences, Part Four (Only mentioned)
- Spike and Faith
- What You Want, Not What You Need, Part Two
- What You Want, Not What You Need, Part Three
- What You Want, Not What You Need, Part Four
- What You Want, Not What You Need, Part Five
- Where The River Meets The Sea, Part One
- Old Habits
- United, Part One
- United, Part Three
- United, Part Four
- Fight or Flight (Only mentioned)
- Freaky Giles Day
- A Little More than Kin, Part One
- A Little More than Kin, Part Two
Behind the Scenes
- Sophie, along with Lavinia, was originally intended to appear in Joss Whedon's planned, but aborted, Ripper spin-off, and would ideally have been played by one of Anthony Stewart Head's daughters. Based on likeness, she would appear to be modeled on Emily Head.