Short answers, pulled from the story.
Cammy debuted in 1993 in Super Street Fighter II: The New Challengers as a British agent of Delta Red. She was originally designed by Noritaka Funamizu to fill a roster gap but was given a tragic backstory involving her creation from M. Bison's DNA.
Noritaka Funamizu created Cammy to serve as a new female fighter alongside Chun-Li. Her original role was as a brainwashed assassin known as Killer Bee, a clone of M. Bison who was part of the Shadaloo Dolls before she regained her memories.
Australian pop singer Kylie Minogue portrayed Cammy in the 1994 live-action film Street Fighter. Director Steven E. de Souza cast Minogue after struggling to find an actress who was both thin and tough enough for the role.
Cammy bears a scar on her left cheek as a physical reminder of the psychological warfare waged against her by the Shadaloo organization. She is a clone created from the DNA of M. Bison, which explains her immense speed and power despite her slender frame.
Cammy's original Delta Red outfit was a green sleeveless thong leotard with camouflage stains, which evolved into a turquoise blue leather jacket with a Union Jack in Street Fighter 6. Her appearance shifted from a sixteen-year-old brainwashed assassin to a mature woman with a bob haircut and red combat boots.
Cammy attempts to rescue other Shadaloo Dolls including Decapre, Marz, and Juni, who are all clones created from M. Bison's DNA. She works to free them from brainwashing and protect them from the trauma of their shared history as assassins.