Board Thread:Character Discussion/@comment-14177453-20140930213744/@comment-1894786-20141102230833

No, Elsa is both Kai (the person who leaves) and the titular Snow Queen, while Anna is Gerda (the one who follows), with Pabbie being the troll, Kristoff being the Robber Girl, and Sven being Bae the Reindeer. Not that hard to figure it out. Once might bring Kai and Gerda as additional characters but in terms of Frozen canon, that's exactly who they are; Elsa and Anna.