Tuxedo isn't a breed but a bicolor coat pattern: usually black and white, with a white chest that looks like a shirtfront and often white paws, a white chin or a blaze on the face. Grey-and-white tuxedos exist too. The pattern comes from white spotting in the KIT gene, and it appears about equally in males and females. Most tuxedos are domestic shorthairs, though the pattern also shows up in breeds such as the Maine Coon and British Shorthair.
Color doesn't set personality, so stories about smart or bold tuxedos are fun but unproven. Tuxedos can be any age, energy level or coat length, from kittens to calm seniors. Spend time with a cat before deciding, and think honestly about your own routine: how many hours you're home, whether you rent, and how much play you can offer each day.