Since the sequel is coming out next year, here are my personal opinions whether another character with snow powers will be feature in the sequel and whether or not shall will be the protagonist or the antagonist.
She should be the Antagonist
I would love to see Anna and Elsa having a wicked relative, who is actually their aunt and even has ice powers.But unlike Elsa's, their aunt's ice powers is more powerful. Her main motive is set the whole of Arendelle on ice permanently, unfortunately her powers were remove by sisterly love.
Usually I don't post articles here any longer, because I have my own blogs to take care of. But this is a little project I did specifically for this club: Entry letters you can use every time you write an article.
Now, I first wanted to sort Disney Princess characters on letters, but I soon realised that there are way too many characters whose name start with A, B or P. I would have been impossible to include even all Disney Princesses if I had done it this way. So in the end, I decided to do a plant based alphabet. I hope you like the result.