Frozen is, naturally, one of the most prominent Disney films about sisterly love.
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However, originally the film did not involve Elsa and Anna being sisters at all!
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Originally, Elsa was just an evil Snow Queen and Anna was the unrelated heroine.
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Anna's role in the film was to convince Elsa to join the side of good.
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The problem, though, was that Elsa turned good too late in the film.
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Since she was evil most of the movie, the audience didn't care about her.
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Making her Anna's sister gave the audience a reason to care about her.
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'Let it Go' then convinced the filmmakers to stop making Elsa a villain period.
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