I am a great beleiver that a character will reveal themselves in the writing, and that writing my characters will show me more about them than just trying to write their character profiles. But there's this one who just refuses to develop and I don't know what to do with her.
I think part of my problem is that she is a plot device- Miranda is the protagonists sister and heir to powerful magic which, conveniently, has not yet developed to a point of usefulness. She is kidnapped by the villain, a distant relative who plans to kill her, take her magic and use it to remake the world as it was in his youth. The story follows two threads: her brother's quest to save her and Miranda's own captivity as she explores the world of the antagonists, their motivations, histories and goals. And, while I find many of the villains interesting, I hate writing from Miranda's POV. She's just so flat and nothing has presented itself that will improve her.
Does anyone have any advice on coming up with dimensions for characters who seemingly refuse to expand?