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Porcelain dolls can have joints. older ones could be both cloth body with porcelain head and limbs, as well as fully Porcelain. Newer BJD dolls aimed at adults take this to the next level.
Now Buzz on the other hand; there's no way he could have the folding pop out wings AND the karate chop action button on his back at the same time. Not to mention the karate chop arm is the same one with the light and sound wrist lazer.