As a young girl, Cammy was kidnapped by Shadowloo. Aside from the fact that she's English, the details of her past and her abduction are still shrouded in mystery. Shadowloo used her as a guinea pig in their super soldier experiments, subjecting her to all sorts of tortures. However, it worked! The mad scientists of Shadowloo modified her DNA, giving her super-human strength, speed, healing, agility, etc.
Once that was done, they brainwashed her, trained her, and turned her into what they thought was perfect soldier.
Bison was so impressed with Cammy's skill and loyalty that she earned a spot at his side as his most trusted servant.
Personality: Cammy is quick-tempered and generally easy to irritate, although there are times she can remain level-headed and collected, showing little emotion. Prone to moody moments, you never know when she may shift in attitude or personality. She's also very stubborn, and trying to talk her out of something she's decided on is like trying to talk to a wall. She also has a very soft spot: Having a strong weakness for cats.