Medea is an associate of Abraham Thorn.
She is "a young, beautiful" "black-haired" witch "with severe features."
When she turned back to the street, there was a woman standing there, a young, beautiful woman with severe features and dark hair. She wore blood-red robes beneath a black cloak. Alexandra gaped at the witch, who stared back at her with a cool smile, and then nodded slightly. Then she was gone. Alexandra winced – the witch had Apparated in plain sight! But the street was quiet and empty and no one seemed to have noticed. (SA16)