[Diamond squeaks in surprise and stares up at him in an open, curious bewilderment. Their hair seems rather solid, but it's as easily manipulated as real hair. Some...how...]

As long as the materials are compatible, I suppose anything could work. But generally there's only one of each of us that's fully formed... The place where we're formed often has many materials of the ones that don't form, so they're collected from there and our doctor will hold onto them until they need to fix us.

[So a little of column A, a little of column B]