Cute! My goddaughter has a rag doll cat with that colouring.
When I was a student, we found a young feral kitten in our backyard in winter. It hissed and spat until it figured out that inside was warm and it went crazy when we fed it some canned shrimp. You could tell that besides its mother's milk, it had lived on dried twigs. With proper nutrition, the scraggly grey kitten became a little black kitten.
I'm glad the outcome was good. I'm still trying to figure out what is the right food to bribe this little one with. Oddly enough, it's not in poor condition and not that keen on all the foods that worked so well with my other ferals