Harry Potter would surely interact with her. Given their history of animosity, he would be one of the first to notice and oppose her new 'dark lady' ways. He would try to protect Hogwarts and his friends from her schemes.
Hermione Granger would also be involved. She's smart and resourceful, and she'd likely be researching ways to counter Umbridge's new powers. She might try to expose Umbridge's actions to the wizarding community, gathering evidence and rallying support against her.
Dumbledore would be a key character in this scenario. As the headmaster of Hogwarts and a powerful wizard, he would be in a position to directly oppose Umbridge. He might try to guide the students and other teachers on how to deal with this new, darker version of Umbridge, using his wisdom and magic to keep Hogwarts safe.
In this fanfiction, perhaps Umbridge becomes a dark lady and forms an alliance with other dark forces. She could use her knowledge of the Ministry's inner workings to help them. This might lead to a big conflict where the good guys, like Harry and his friends, have to figure out how to stop her and her new allies. It would be really exciting to see how the characters react to this new, more dangerous Umbridge.
Hermione is a must. Her intelligence and extensive knowledge of magic and Hogwarts rules would be invaluable. Ron would be involved too. He's Harry's close friend and has a bit of a mischievous streak himself. Fred and George Weasley are very likely to be part of it. They are known for their love of pranks and their dislike of authority figures like Umbridge. Luna Lovegood could also be included. She has a unique perspective and might come up with some really out - of - the - box ideas for Harry's revenge on Umbridge. Plus, her presence would add an interesting and somewhat dreamy element to the whole revenge plot.
Fred and George Weasley are also favorites. Their mischievous nature can be amplified in fanfictions. They could create new and even more spectacular magical pranks specifically aimed at Umbridge, like turning her office into a never - ending maze of trick stairs and hidden rooms filled with various magical creatures that drive her crazy.
Obviously, Harry Potter is one of the main characters. He is the central figure in the fight against Umbridge, using his courage and leadership skills. Hermione Granger would also be a main character. Her intelligence and knowledge of magic are crucial in coming up with plans to oppose Umbridge.
Some of the older students like the Gryffindor prefects could support Harry. They understand the importance of a just Hogwarts environment. Neville Longbottom could also be a strong supporter. He has grown a lot in courage throughout the series, and this would be his chance to show his loyalty to Harry and fight against Umbridge's unfair treatment of the students.
It could be Harry Potter himself. He has been a victim of her tyranny and might finally find a way to expose her once and for all.
It might be. There are a lot of fans who like to see different takes on the relationships between characters in the Harry Potter universe. If the fanfiction is well - written and the idea of Harry having 'fun' with Umbridge is presented in an interesting way, it could attract a fair number of readers.
The Weasley twins, Fred and George, are often the main instigators. They have a reputation for their mischievous pranks in the original series, so it's natural that they would be at the forefront of pranking Umbridge in fanfiction. Their creativity and disregard for authority make them perfect for coming up with elaborate and hilarious pranks against her.
However, Umbridge can also be a popular character in these fanfictions in a different way. She is the perfect villain. Her over - the - top cruelty and her self - righteous attitude make her a great antagonist. Writers can really explore her nastiness and how the other characters react to her, especially Snape who has his own way of dealing with her.
Yes, there are some. Some fanfictions might focus more on the emotional and mental struggle Hermione goes through rather than extreme physical torture. They might show how she overcomes Umbridge's oppression through her intelligence and the support of her friends.