Harry Potter villain (Dolores Umbridge) given back-story and follow-up to "Deathly Hallows" by J.K. Rowling

from posting at TODAY dot-com (NBC Morning show):
J.K. Rowling's thoughts on Dolores Jane Umbridge
Once, long ago, I took instruction in a certain skill or subject (I am being vague as vague can be, for reasons that are about to become obvious), and in doing so, came into contact with a teacher or instructor whom I disliked intensely on sight.
The woman in question returned my antipathy with interest. Why we took against each other so instantly, heartily and (on my side, at least) irrationally, I honestly cannot say. What sticks in my mind is her pronounced taste for twee accessories. I particularly recall a tiny little plastic bow slide, pale lemon in colour that she wore in her short curly hair. I used to stare at that little slide, which would have been appropriate to a girl of three, as though it was some kind of repellent physical growth. She was quite a stocky woman, and not in the first flush of youth, and her tendency to wear frills where (I felt) frills had no business to be, and to carry undersized handbags, again as though they had been borrowed from a child's dressing-up box, jarred, I felt, with a personality that I found the reverse of sweet, innocent and ingenuous.
I am always a little wary when talking about these kinds of sources of inspiration, because it is infuriating to hear yourself misinterpreted in ways that can cause other people a great deal of hurt. This woman was NOT 'the real Dolores Umbridge'. She did not look like a toad, she was never sadistic or vicious to me or anyone else, and I never heard her express a single view in common with Umbridge (indeed, I never knew her well enough to know much about her views or preferences, which makes my dislike of her even less justifiable). However, it is true to say that I borrowed from her, then grossly exaggerated, a taste for the sickly sweet and girlish in dress, and it was that tiny little pale lemon plastic bow that I was remembering when I perched the fly-like ornament on Dolores Umbridge's head.
I have noticed more than once in life that a taste for the ineffably twee can go hand-in-hand with a distinctly uncharitable outlook on the world. I once shared an office with a woman who had covered the wall space behind her desk with pictures of fluffy kitties; she was the most bigoted, spiteful champion of the death penalty with whom it has ever been my misfortune to share a kettle. A love of all things saccharine often seems present where there is a lack of real warmth or charity.
So Dolores, who is one of the characters for whom I feel purest dislike, became an amalgam of traits taken from these, and a variety of sources. Her desire to control, to punish and to inflict pain, all in the name of law and order, are, I think, every bit as reprehensible as Lord Voldemort's unvarnished espousal of evil.
http://www.today.com/books/j-k-rowling-writes-harry-potter-halloween-tale-profiling-malicious-1D80248516