Controversial opinion among Dune book fans maybe, but I loved the changes they made to Chani's character. Making her a fedaykin who is already an experienced fighter before Paul arrives was a brilliant choice. Dune Part Two is a war movie, and this puts her at the center of the action, side by side with Paul, and gives her a much more active role than she has in the book.
We got a hint of where things were going in the beginning of Dune Part One. The first thing we ever know about movie Chani is that she's a fighter. She serves as a voice for the Fremen, telling us the story of their struggle from her point of view. I wrote here about the difference this change makes compared to other adaptations of Dune, what a perspective shift it is to have the world of Arrakis introduced not by an outsider, describing it as a dangerous but valuable colonial prize, but by one of its native inhabitants, who tells us before all else that it's beautiful, her home that she's fighting to liberate. I am so, so glad that the second movie followed up on this characterization.
