Its witch is fascinated by games. All witches are, and play games as easily as they breathe, but those are the time-old games of body and soul, motion and Stillness, thought and Not.
This witch plays those games, of course. But she is fascinated by mortal games as well. Such pretty lights and sounds! All those tidy little bundles of story and system that she can't wait to cut open and feast upon!
The problem is that she is terrible at them. All of them. (Perhaps it comes of playing too many of her own, where she always wins.) You would laugh to see it, though it might be your last laugh as you are now.
But a witch's problem are a doll's life, and she has a doll for this one too. She did not shape a new body or mind for this, but retasked her second-favorite maid as a sort of ludic buffer. Now it plays the games for her.
It sits in near-Stillness in its lovely dress, the screenlight glinting on glass eyes, the only motion its cleverly jointed thumbs. The witch watches over its shoulder, in glee, demanding this passage be explored, or that skill unlocked.
The doll misses the kitchen and the laundry. It changes the player avatar in all of the witch's games to have the witch's likeness. The witch thinks this part of its service, but in truth, it enjoys watching her die, over and over and over.