Whenever it happens, Frozen3 needs to be a bigger deal for Anna than for Elsa. The first 2 Frozen films had their plots primarily surrounding Elsa, her powers, and her inner conflict. Anna played a key supporting role in these stories, but Frozen 3 should be Anna's time to come to the forefront and receive the same care and character treatment that Elsa has now received twice.
In Frozen, Elsa's lack of control of her powers causes a major threat to Arendelle and she has to come to terms with the anguish of her childhood to save her kingdom from death and ruin. Anna is able to help her sister feel loved and serves as the impetus for Elsa to overcome her emotional issues. Frozen 2 goes further in this regard, showing Elsa's inner struggle with being Queen of Arendelle and setting her on a quest to save the kingdom once again—uncovering her own truth along the way and freeing herself from the expectations that held her back from being who she really is. Anna also helps Elsa here, serving as the other side of a spiritual bridge between the two sisters.
Related: Frozen 3 Should Make Elsa's LGBTQ Identity Canon (But Not With A Partner)
This said, Anna has been Elsa's support system enough in Frozen franchise. She's a great character with her own desires and motivations, and now, with Anna as Queen of Arendelle, it's time for Frozen 3 to focus on her and let Elsa take on a more supporting role. Anna has a new kingdom to run, a fiance to marry, and is an integral part of the Frozen franchise — meaning Frozen 3 is a bigger deal for Anna than Elsa.
The ending of Frozen 2 serves as true catharsis for Elsa. It answers questions about her powers, frees her from mindsets that were holding her back, and shows her embracing who she
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