Carmella is the oldest child of Ricardo and Rosa Bettencourt, an immigrant family from Puerto Rico. She has two brothers, Mike and Joeseph (Joey). Ricardo (Ricky) was an NYPD officer who was killed in the line of duty by a street gang known as the 110th Kings.
Carmella is a member of the Monarch Industries Black Ops Omega team, with the code name of Harlem, and is trained in paramilitary skills with an emphasis on CQB and combat driving. She is a crack shot with pistol, SMG, and rifle, and uses a single edged short sword in wicked fashion.