Elsa in one of the protagonists and Anna's sister she is based on the snow queen from a novel written by Hans Christian. Thou one of the heroes of the story she was originally going to the main villain in early drafts there's even a deleted scene of her as the bad guy, (see http://www.youtube.com/watch?v=_ah3zQOVims) First there wasn't going to be any relation between her and Anna, but later she would be made her sister who would later redeem herself making her the 3rd main Disney villain to do so, (the other two would be Denahi from Brother Bear and John Silver from Treasure Planet). She was replaced by Hans as the main antagonist

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