A possible plot idea is that Umbridge discovers a new magical device that allows students to communicate telepathically during exams. In her Luddite mindset, she sees this as a threat to the traditional exam - taking process. So she sets out to destroy all the devices and even expels students she suspects of using them. This could lead to a rebellion among the students who see the device as a useful study aid.
One plot idea could be that Umbridge tries to ban all magical technology in Hogwarts under the guise of it being 'dangerous' in her Luddite ways. This could lead to chaos as students rely on things like magic quills that record lectures and enchanted maps. Another could be that she forms a secret society within the school of like - minded Luddites, and they start to sabotage magical inventions.
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.
Umbridge's Luddite nature could be shown through her strict opposition to any new or non - traditional magic at Hogwarts. For example, if a student were to introduce a new spell that made studying easier, she would immediately ban it, citing it as against the 'old ways' of magic.
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.
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.
One interesting fanfiction could be about Umbridge getting a taste of her own medicine. Maybe the students use magic in a clever way to make her face the consequences of her cruel actions without getting caught themselves. Another could be a story where Umbridge has a change of heart due to some magical event that shows her the error of her ways, but still has to face the wrath of the students she's wronged. And there might be a fanfic where Umbridge is transported to a different magical world and has to learn to adapt and deal with new rules and cultures.
Another plot could be that Umbridge is forced to work with Harry and his friends against a greater evil. This would be a huge shift as she hates them so much in the original. But in the fanfiction, they might have to put aside their differences when a new dark wizard emerges, more powerful than Voldemort, and they realize they need all the help they can get.
There could be a fanfiction where Hermione comes up with a brilliant prank. She uses a spell to make Umbridge's parchment write out all the unjust rules she has made instead of whatever Umbridge is trying to write. Every time Umbridge tries to write a memo or a note, the parchment just keeps repeating things like 'No groups larger than three' and 'No fun allowed' over and over again, driving her mad.
I'm not sure there are many 'lemony' fanfictions that are appropriate to recommend, as they often involve inappropriate or adult - themed content. However, there are some great non - inappropriate fanfictions about Umbridge that focus on her tyranny at Hogwarts. For example, some fanfictions explore how the students band together to resist her rules in creative and magical ways.
One interesting plotline could be Harry leading a secret resistance against Umbridge within Hogwarts. He might use his skills in the DA (Dumbledore's Army) to outwit her at every turn. For example, they could use magic in clever ways to undermine her rules without getting caught.