Tortoiseshell is a coat pattern rather than a breed: black-based and orange-based colors blended in patches or a fine mottle, usually with little or no white. Dilute torties look soft gray and cream, and torbies add tabby stripes. Because the orange gene sits on the X chromosome, nearly all torties are female. Most are domestic shorthairs, though the pattern turns up in many breeds, from Maine Coons to British Shorthairs.
That means size, coat length and energy vary from cat to cat. The famous "tortitude" is folklore more than proven fact, and a cat's history, age and socialization say much more about personality than color does. In Tallahassee, the practical questions are about the cat itself: how it handles indoor life, whether it tolerates a carrier during storm season, and how much play it needs each day.