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.
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.
“[Umbridge's] 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,” Rowling wrote.
"She has an affinity for this horrible object, which would help rather than hinder her" so, the horcrux's negativity actually affected in a good way for umbridge(in her perspective, not us ofc, she got worse!)and made her able to summon a patronus.
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.
Her prejudiced views toward Muggles were so vile that even Ministry workers with anti-muggle ideologies were shocked by her suggestions of how the non-magical community should be treated. Despised her Muggle mother and her Squib brother, considering them inferior to her and her father under the latter's influence.
Peter Pettigrew (a.k.a. Wormtail) is one of two Death Eaters known to have been in a House other than Slytherin (Gryffindor) while at Hogwarts. There, he was a close friend of Sirius Black, James Potter, and Remus Lupin, although he was the least intelligent and least talented of the group.
Peter Pettigrew a.k.a. Wormtail was a Death Eater and a Gryffindor. It is unknown whether there are Death Eaters from Hufflepuff or Ravenclaw. EDIT: And of course there were Death Eaters not from Hogwarts (Karkaroff for example).
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.
Umbridge is slightly worse than Bellatrix, because at least Bellatrix is devoted to someone other than herself. Umbridge is completely self-serving and self-absorbed. It's also the reason why Kieran Wilcox is less evil than his girlfriend/goddess figure Piper Shaw.
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.
Why did Harry's scar hurt when Umbridge touched him?
J. K. Rowling stated that the pain from Harry's scar on his forehead was caused by the piece of Voldemort's soul trying to leave his body through the wound it entered to rejoin its master's soul.
Yes, but Voldemort is convinced that no one knows he made Horcruxes. And that the Horcrux is safe in the cave. Besides, he would never allow anyone to wear the Slytherin locket. She kept lying to everyone that it was a family heirloom and that she was related to the Slelwyns.
Hagrid's half-giant status also meant that Umbridge was highly prejudiced against him, viewing him as a "filthy half-breed", and so she became quite determined to get rid of him. Umbridge's biased and insulting inspections of his classes made Hagrid rather nervous, and he was soon placed on probation.
Harry Potter had a few love interests during his time at Hogwarts. Though he eventually settled down with Ginny Weasley, he also had a thing for Cho Chang in his earlier school years. Then, of course, there's his secret love for Draco Malfoy…
In the books, Pansy Parkinson has a schoolgirl crush on Draco, and they went together to the Yule Ball. However, there was no true love between them. In the Cursed Child, Draco Malfoy's wife is Astoria Greengrass.
For example, Peter Pettigrew was in Gryffindor, yet he betrayed the Order of the Phoenix and joined Voldemort; Quirinus Quirrell, a Ravenclaw, also allied himself with the Dark Lord; and (albeit only in an alternate timeline) Cedric Diggory from Hufflepuff would become a Death Eater, whereas Slytherins such as Horace ...
They sought to save Cedric and created an alternate timeline where Cedric survived and became part of the Death Eaters, because of the humiliation they caused him when they tried to save his life. Cedric's original and heroic life and death was later restored.
Peter Pettigrew represents the worst Gryffindor in the entire Harry Potter series. Wormtail, as he was known among his friends, was thought to be a friend of the Marauders and a member of the Order of the Phoenix, but he was secretly working for Voldemort and committed the ultimate act of betrayal in the series.
Dolores Umbridge's horrifying personality was shaped by her upbringing and family history, including her disdain for her Muggle mother and Squib brother. Umbridge climbed the ranks at the Ministry of Magic by stealing credit for others' work and manipulating those in power, like Cornelius Fudge.
Umbridge was appointed to the D.A.D.A. teaching post not by Dumbledore, as was customary, but by the Ministry of Magic. She was sent to Hogwarts to monitor the school as well as Dumbledore due to fears that he would try to overthrow Minister Cornelius Fudge.
According to the fan theory (via Reddit), Dolores wants her family to lose their powers. After all, the gift of super hearing isn't necessarily as helpful as increased strength or instant plant life. Like Mirabel, Dolores also gets overlooked in her family.
