Tin Woodman
"The Wonderful Wizard of Oz" shows an early example of the problem: although the Tin Woodman does not die when his limbs and head are severed, the two wicked witches are killed (the Wicked Witch of the East could be explained that she was simply crushed and not really dead, but could not do anything anyway, and in "The Oz Odyssey", the Wicked Witch of the West comes back to life). One theory brought forth as to why the Tin Woodman does not die is discussed in Edward Einhorn's book "Paradox in Oz", where King Oz says that the Tin Woodman (then Nick Chopper) would have died were it not for his time magic. When the Tin Woodman rescues the Queen of the Field Mice by chopping off the head of a pursuing wildcat, it seems unlikely the cat's unjoined head and body continue to live independently of each other, although this goes unmentioned. Again, although the Tin Woodman survived losing all his body, prior to that, he had grown up and lost his parents in a manner inconsistent with later descriptions of Oz. Again, in "Ozma of Oz", Jack Pumpkinhead was described as "a little overripe", and in "Dorothy and the Wizard in Oz", he does not appear at all, although all the other characters do reappear; the implication is that he spoiled, as he feared from his creation. It is unlikely, however, since, according to the previous book, while a pumpkin which serves as Jack's head can spoil, it can be replaced, which was done several times without a problem.