One idea could be that the OC is a powerful mage from a far - off land who comes to Arendelle during a time of new danger. The OC meets Elsa and they initially have a bit of a clash due to their different ways of using magic. But as they face the new threat together, they start to understand and respect each other more. Eventually, they combine their magical powers to save Arendelle and in the process, form a deep friendship or even more.
Maybe the OC is a lost traveler who stumbles upon Elsa in the forest. The OC has no knowledge of magic at first. Elsa is hesitant to show her powers, but as the OC shows kindness and acceptance, Elsa begins to open up. The fanfic could then explore how the OC helps Elsa become more comfortable with her powers in different situations, like using her ice powers for fun instead of just for protection. And they could go on adventures together around Arendelle and its outskirts.
The OC could be a healer from a neighboring kingdom. When Elsa accidentally injures herself while exploring her powers further, the OC is brought in to help. They start off with a doctor - patient relationship. But as Elsa heals, they discover that they both share a love for nature in different ways. The OC shows Elsa how to use her powers to help the plants and animals in Arendelle, and this new connection between them blossoms into a relationship that is both heartwarming and magical.
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