Siberian tortoiseshell cats are generally nice cats and their personalities range across the board. Since they are a rare breed, and they are sweet-natured cats. You can expect them to be moderately active, gentle cats with personalities much like any domestics. These intelligent cats love a challenge, so their living environment should offer them toys and people to keep these fluffy cats active and entertained. When Siberian cats aren't playing and goofing around, they're more than happy to crawl up in your lap and relax for a while.