Cheetahs are badass. They are closer to a big house-cat than they are to other big cats like lions. I think they are also the biggest cat that can purr, which is another seperation from the classification of big cats, because the other big cats can't purr. And their personality and behavior is also very similar to a house cat, they are just more nervous. Cheetahs get eaten by all the other species of big cats, so they are naturally very nervous.
In many zoos, they raise the baby cheetah with a puppy, and it lives it's whole life with the dog. The cheetah acts like a cat, and plays like the dog. But the reason for the dog is to have the cheetah be calm. When the cheetah starts to get nervous, it looks at the dog and sees that the dog is very happy and calm, so then the cheetah becomes happy and calm too since he sees that everything is okay. The cheetah learns that people are his friends, so he lets the keepers come in with him, and people can play with the cheetah, rub it, lay down with it, and it acts just like a dog.
Cheetah is the only big cat species which is safe to have as a pet. They are naturally very friendly when they know that they can trust you, and they behave even better than many house cats.