Frozen 3 will need a villain to finish out the trilogy, and it should avoid the mistake of repeating the bad guys from its predecessors. As the third film in a wildly popular franchise, the expectations for Disney to deliver another breathtaking movie are high. A flop could potentially put a dark stain on the previous films and negatively impact the series' legacy. Therefore, the House of Mouse must tread carefully when choosing the plot and characters—especially the villain.
https://screenrant.com/frozen-3-sequel-villain-mistake-prince-hans-repeat/