Kristoff and Anna were originally children called Kai and Greta, which can still be seen in early concept art. Eventually as the story changed they were aged up to adults and renamed Kristoff and Anna. Kristoff himself is based on both Kai and the Robber Girl from the original tale, whereas Anna is based on Gerda and the Summer Witch, whom according to some adaptations of The Snow Queen, is the title Queen's sister.

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