Tortoiseshell describes a coat, not a breed. A tortie's fur blends black-based and orange-based colors in patches or a fine mottle, usually with little white. Add large white areas and the cat is called a calico instead. Dilute torties look soft gray and cream. Because the orange gene sits on the X chromosome, nearly all torties are female, and the rare males usually carry an extra X.
Most torties in Winston-Salem homes are domestic shorthairs, though the pattern also shows up in Maine Coons, Persians and many other breeds. Shedding is moderate, so a weekly brushing keeps furniture manageable. Personality depends on a cat's age, history and socialization far more than on color, so a tortie might be shy, bold, cuddly or aloof.