Another idea is a time - travel fanfiction. Harry goes back in time and has to deal with Umbridge when she was a student. He tries to change her path so that she doesn't become the horrible person she is in his time. This could involve him befriending her and showing her the value of kindness and freedom.
A great plot twist could be that Umbridge is actually an undercover agent for the Order of the Phoenix all along. She has been playing the role of the villain to get closer to the Death Eaters at Hogwarts. Harry discovers this accidentally and has to work with her in secret to take down Voldemort's supporters in the school.
It could start with Harry being forced to work with Umbridge on a special project at Hogwarts. At first, they're at odds, but as they work together, they gradually find common ground. For example, they might both be interested in a particular area of magic that is relevant to the project.
She would probably be outraged. Umbridge is a strict and rather narrow - minded character in the original series. Fanfiction often takes creative liberties that she would likely see as subverting the 'proper' order of the wizarding world she thinks she upholds.
One idea could be a scenario where Umbridge has a change of heart due to an encounter with Harry in a life - threatening situation outside of Hogwarts. Maybe they get trapped in a magical forest together and have to rely on each other to survive, which makes Umbridge see Harry in a new light.
Well, there could be a plot where Umbridge loses her memory and Harry has to take care of her while also trying to figure out what happened. As he takes care of her, he discovers that without her Ministry - influenced self, she has a different side to her. Meanwhile, the other characters are suspicious of Harry's actions. This could create a lot of tension and also explore the idea of redemption and how people are not always what they seem. It could also lead to a more in - depth exploration of Umbridge's character, which is often portrayed as one - dimensional in the original books.
There's also a possibility that it could be a minor Death Eater that we don't know much about from the original series. The author of the fanfiction could create a new character who was a Death Eater but is now having doubts. Hermione could be the one to find this person and start their journey of change. This would give the author a lot of creative freedom to develop the character's backstory and their relationship with Hermione.
Yes, there are many. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Search for the 'Harry Potter x Dolores Umbridge' relationship tag and then filter out the stories with adult or inappropriate content. There are often well - written, non - adult stories that explore their complex relationship in different ways, such as focusing on their ideological clashes or how they interact within the Hogwarts setting.
In this type of fanfiction, the relationship between Hermione and the Death Eater could be very complex. Maybe it starts as a hostile one, but as the story progresses, they might find some common ground or mutual understanding. It could also be a story of redemption for the Death Eater through Hermione's influence.