J.K. Rowling revealed the inspiration for Harry Potter's nemesis, Dolores Umbridge from her "Harry Potter" series on Halloween. She wrote on her website, Pottermore, that the villain idea came from a teacher she loathed, it was hate at first sight.

The award-winning author wrote a profile of Umbridge, one of the most vicious characters in the "Harry Potter" series, in celebration of Halloween.

Rowling says that the instructor is not the real Dolores Umbridge and does not share the same vicious views. She didn't know the teacher well enough to know her views or preferences. But, when she illustrated Umbridge with the fly-like ornament on her head, it was the teacher's pale lemon plastic bow that she thought of.

Yet, some traits of Dolores' bad thoughts also came from one of J.K. Rowling's former coworkers. She once shared an office with a woman who had covered the wall space behind her desk with pictures of fluffy kitties. The same woman was, "the most bigoted, spiteful champion of the death penalty," Rowling says.

"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."

Even the name of the character played a role in her hideous traits. Dolores means sorrow, which is what Umbridge inflicts on many people around her. The name Umbridge comes from the British saying, 'to take umbrage' which means to take offense.

Dolores Umbridge is a vicious teacher in the "Harry Potter" series. She bans Harry Potter from playing Quidditch at Hogwarts and forces him to write the words, "I must not tell lies" on the back of his hand.