Wanting to discredit Harry Potter, Madam Undersecretary Dolores Umbridge ordered two Dementors to Little Whinging in order to silence his claims on Lord Voldemort's return. Harry managed to drive the dementors away with a corporeal Patronus, thus saving him and his cousin, but was punished by the Ministry regardless.
It had mostly to do with the fact that Umbridge didn't believe Harry Potter was the Chosen One, but that he was actually in the way of some greater plan Cornelius Fudge had for the wizarding world, of which Umbridge believed both Harry and Professor Dumbledore stood in the way with their claims that…
After Voldemort's defeat by Harry at the Battle of Hogwarts and the restoration of the Ministry of Magic by the new Minister, Kingsley Shacklebolt, Umbridge was sentenced to life imprisonment in Azkaban for her crimes against Muggle-borns.
A theory posted on Reddit suggests Dementors were drawn to Harry because they could sense the piece of Voldemort's soul living in him. Harry is an “accidental horcrux”, created when the killing curse casted by Voldemort backfired, fragmented his soul, and sent a piece of it to Harry's body.
The HIDDEN Truth Behind Harry's Dementor Attack - Harry Potter Theory
Was Umbridge a death eater?
In turn, Umbridge acts in the open, from a position of power, being the Minister of Magic's right hand. She's not a Death Eater masquerading as a government official — she's just an awful person taking advantage of being in a top position.
Apparently, Umbridge's mother was a Muggle and her brother was a Squib – a source of huge embarrassment for the family. Perhaps their abandonment and retreat back into the Muggle world had such a huge impact on Umbridge that it became the catalyst for her Muggleborn-targeted cruelty later on in life.
Wanting to discredit Harry Potter, Madam Undersecretary Dolores Umbridge ordered two Dementors to Little Whinging in order to silence his claims on Lord Voldemort's return. Harry managed to drive the dementors away with a corporeal Patronus, thus saving him and his cousin, but was punished by the Ministry regardless.
However, Harry was convinced talking about the punishments he was forced to do wasn't a good idea. He stubbornly clung to the belief that this was a private battle of wills between himself and Umbridge. He didn't want to give in or give her the satisfaction of hearing that he had complained about it.
Lupin explains that Harry is more deeply affected because Dementors work by extracting good memories, leaving nothing but the bad recollections, and Harry has a much grimmer history than anyone else.
If you have only seen the films, you might be surprised to hear that it wasn't Cho Chang who betrayed Dumbledore's Army to Professor Umbridge – it was Marietta Edgecombe. A friend of Cho's and a fellow Ravenclaw, Marietta (reluctantly) joined the DA.
Although she was very happy to go along with Voldemort's view of the world – she was very much a bigot – her predominant motivation seemed to be more about how much authority and influence she could secure because for Umbridge it was all about well… Umbridge.
With the fall of Lord Voldemort, Dolores Umbridge was put on trial for her enthusiastic co-operation with his regime, and convicted of the torture, imprisonment and deaths of several people (some of the innocent Muggle-borns she sentenced to Azkaban did not survive their ordeal).
Bellatrix was an unapologetic monster who utterly relished in the pain and torment she caused, Umbridge was a monster but a monster in a pink coat, she could hide her evil behind a fake smile and supposed civility.
Was Umbridge a terrible person because of the Horcrux?
Despite this, some feel that her extreme cruelty in Deathly Hallows was given to the influence of Slytherin's Locket as a Horcrux, but J.K. Rowling has affirmed that this isn't the case and that the Locket couldn't worsen Umbridge as she was already such a horrible person.
Dolores Umbridge was arguably the most evil character in the Harry Potter series, sometimes more so than Lord Voldemort, mainly Harry Potter and The Order of the Phoenix.
The only staff member who supported Umbridge whole-heartedly was the caretaker, Argus Filch, who grew to like her methods, as well as being given permission to torture students himself. She later fired Gamekeeper Rubeus Hagrid, as he was a half-giant.
They were ordered to register with the Muggle-Born Registration Commission, which convicted them of stealing magic from "real" wizards and witches (pure-bloods) and imprisoned them in Azkaban, though the entire trial was unfair and Muggle-borns were punished whether the evidence proved them guilty or not.
What happens to Umbridge after the Centaurs take her?
Umbridge was ultimately rescued by Dumbledore, although she was apparently left with a significant fear of centaurs afterwards, reacting violently at even the sound of hoof-beats.
Well, in Umbridge's case, while she may have been working for the bad guys of bureaucracy, she was never under Voldemort's thumb. She was allied with the Death Eaters and definitely enabled them, she was never an official part of the organization.
When Dementors attacked, they often caused victims to relive their worst memories. Even though Dudley was unable to acknowledge their presence, the creatures were able to manipulate his mind.
Umbridge climbed the ranks at the Ministry of Magic by stealing credit for others' work and manipulating those in power, like Cornelius Fudge. Despite believing she was on the side of good, Umbridge's ruthless actions eventually led to her imprisonment in Azkaban for the false imprisonment and deaths of Muggle-borns.
Although Umbridge was not a Death Eater, and had no direct contact with Lord Voldemort, she showed that she was fairly in line with their goals. This was due to Umbridge's callous nature and her prejudiced beliefs, both of which were similar to Death Eater behavior.
She persecutes Muggle-born wizards and witches under false accusations of stealing magic, sentencing them to be either kissed by Dementors or sent to Azkaban. While not a Death Eater like Voldemort or Bellatrix , Umbridge stands out as one the most loathsome characters due to how realistic her threat level is.
After Harry Potter stood up to Professor Umbridge by giving an interview to The Quibbler, edited by Xenophilius Lovegood, Trelawney showed her support by breaking her usual pattern of predicting horrible deaths for Harry, instead predicting that he would have a long life, become Minister for Magic, and have twelve ...
