There's nothing wrong with Dolores Umbridge that a dementor's kiss wouldn't cure. She's a Nazi in fluffy pink clothing, and as despicable a character as I've read in recent fiction. One of the disappointments at the end of Harry Potter and the Deathly Hallows was that Rowling did not include a line in the paragraph about Kingsley Shacklebolt taking over as Minister of Magic announcing that Umbridge had been arrested and sent to Azkhaban. I'm sure Schacklebolt will get around to it quickly, but I'd like to have read it, if you know what I mean.