The person I dislike the most is Umbridge. Her and her decrees got me so over excited. I was saddened to see that she still works at the Ministry. Umbridge personifies the elements of sheer evil unlike anyone else in the book (with the exception of Voldemoert), but at least he has the excuse of poor upbringing, nobody to love him etc. I get the feeling that Umbridge has had a pretty comfortable life, she has no excuses for her behaviour.