Which one comes first; the story of animation or the characters?

Ever asked yourself which one comes first, characters or story? Take, for example, Woody, in the Toy Story. Was he born before the whole story or Toy story was written all in once and then some changes had been made in the characteristics?
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https://dreamfarmstudios.com/blog/which-one-comes-first-the-
story-of-animation-or-the-characters/