A two-doll set where the colour does the work, and why they are bought together.
Two dolls
The Wicked crochet doll set is Elphaba and Glinda — one in green and black, one in pale pink and silver, and the contrast is the whole point.
Colour as structure
These two are built on similar bodies, so unlike most sets here the difference is carried almost entirely by colour and costume rather than by shape. That puts the weight on the yarn: the green has to stay deep rather than turning grey under a shelf light, and the pale one has to stay clean-looking against it.
A pair, in practice
Almost nobody buys one. Ordered at the same size they stand as a pair; ordered at different sizes they read as two unrelated dolls that happen to share a shelf.
Which size
10 or 12 inches. The dress detail on both is where the work is, and it needs the room.
Where they come from
Two witches were friends at school long before anyone called either of them good or wicked, and the story is how they ended up on opposite sides of it.
Which is why nobody buys one. The pairing carries the meaning, and a single doll on a shelf is half a sentence.
See it at Wicked crochet doll set, another two-doll set at Kiff-Barry crochet doll set, and more in cartoon crochet dolls.