The Genoese Fortuneteller, Rose
Rose is a fortune teller from Genoa and sensed that Doomsday was approaching, and knew a person of great evil was causing it. She found the source of the evil in Bison and defeats him, thinking she has rid the world of him for good. Unfortunately, by reading her tarot cards she discovered Bison was still alive.
In Street Fighter Alpha 3, she faces Bison once again and finds out that she and Bison share the same soul. Bison outmatches her as he takes total control of her body. There she lay unconscious where Guy (who she meets earlier on when he goes after Shadoloo) finds her. When Bison is killed by Charlie (who sacrificed his own life in the process), Bison's soul went to his new host, Rose.
Bison stayed in and controlled Rose's body until a new, albeit weaker, body was made for him during the time of Street Fighter II. Akuma killed Bison during the second World Warrior tournament, sending his soul to hell with the Shun Goku Satsu. What became of Rose after this is still in question.