I have a tortoiseshell cat, and she is fairly friendly... well, she doesn't scratch me or bite me unless she is really freaked out, although she also tends not to like my younger sibling and her friends, but they're all really loud. I, however, can't speak for everyone, I'm sure there are some tortoiseshell cats that aren't friendly at all. 'Tortoiseshell' is just the color of their fur, I think there can be friendly and not so friendly tortoiseshell cats, but I know mine isn't mean.
They are almost always females
Cat food!!!! Tortoiseshell cats eat just the same as all other cats.
Willowbreeze and Heathershine are RiverClan cats that are tortoiseshell in coloration.
Well, tortoiseshell cats' fur are in dappling patterns, sort of all blended together, and tabby cats' are usually in stripes.
No by what I am aware tortoiseshell cats are not aggressive.
Tortoiseshell is a specific coat pattern and color. Some breeds of cats may naturally have this, but it tends to show up in mixed breed or "barn" cats. They can be found in any country that has a feral population of cats.
A tortoiseshell cat is a coat color where the cat is a molted brown cat with black, reddish, or orange patches. They can also have white paws. Tortoiseshell cats have unique genetics. The vast majority of tortoiseshell cats are female, because two X chromosomes are required to produce black, gold and orange coloring. Male cats only have one X and one Y chromosome, so technically it's genetically almost impossible for a male to inherit the tortoiseshell coloring. A male tortoiseshell has an extra X chromosome, making it an XXY. According to a study by the College of Veterinary Medicine at the University of Missouri, only 1 in 3000 tortoiseshell cats is male.
b/c all Tortoiseshell cats are born as females. It is just part of the breed.
No, Redtail was a ginger tomcat with a distinctive red tail. Tortoiseshell cats have a coat pattern with a mix of black and orange colors.
human food
Tortoiseshell cats are not predisposed to gain weight more than any other breed of domesticated cat. All cats will gain weight if fed too much food and not are inactive.
Warm-blooded
If you mean, what are you most likely to encounter with tortoiseshell cats in particular, then one thing I can say, is that if it's a longhair tortoiseshell (there are also shorthair tortoiseshells), you should comb or brush them every day to remove loose fur, to reduce the amount of fur they swallow as they groom, and thus reduce their hairballs. They're going to get hairballs anyway, which they will vomit up, sometimes every few days, but combing or brushing them will reduce that.Other than that, most of the tortoiseshell cats I've encountered (including the one I currently have), are friendly and affectionate, and like variety.