How would the story develop if Harry Potter takes over Umbridge in fanfiction?

Well, he might start by changing all the unfair rules she had imposed at Hogwarts. He could bring back the fun and freedom in the school, like allowing students to form their own clubs again.

Harry's character would face a huge transformation. He'd be constantly on edge, having to deal with Umbridge's strict rules and her mean - spirited nature. This would make him more empathetic towards those who are oppressed. He'd also become more resourceful, finding ways to communicate with his old friends and allies despite Umbridge's attempts to isolate him. His experience with Umbridge would be a crucible that forges him into an even more resilient and determined hero, ready to take on not only Voldemort but also the corrupt elements within the wizarding establishment.

His friends like Ron and Hermione would surely support him. They have been through a lot together, and they believe in Harry's leadership. Also, the Weasley family in general would be behind him. They have always been on Harry's side in his battles against the dark forces.

She could become even more vindictive. If she reads about characters who oppose her in the fanfiction, she might take it as a personal affront and start planning harsher punishments for any students who show signs of rebellion in the real Hogwarts, just like in the books.

Well, he might use his magic to solve Westeros' political problems. For example, he could use a spell to make the warring factions come to a peaceful negotiation. He might also introduce magic to the people of Westeros, which would completely change their way of life. And his skills in fighting dark forces could be useful in dealing with any threats in Westeros, like the White Walkers.

The development of their relationship in Harry and Umbridge lemon fanfiction can be quite diverse. It could be that Umbridge, in an attempt to control Harry more closely, gets drawn into his world in a way she didn't expect. Harry, on the other hand, might start to see through her tough exterior and find some vulnerability in her. This discovery could lead to a series of exchanges between them, some filled with tension, some with a strange sort of understanding, and over time, this shapes their relationship in the fanfiction.

She'd be appalled. Umbridge is all about following the rules and maintaining the status quo. Fanfiction doesn't adhere to the official canon she so firmly believes in.

Well, when Harry Potter takes over Hogwarts in fanfiction, he'll surely face the challenge of modernizing the curriculum. The magical world is evolving, and the old curriculum might not be sufficient. He also has to handle the different magical families' influence on the school. Some families might want special treatment for their children, which he would need to resist to ensure fairness for all students. And then there's the matter of dealing with any dark magic remnants that might still lurk in the school's corners.

The story could develop with Naruto becoming a villain of sorts. He might start attacking other villages or even his own, leading to a big conflict. His friends would then be on a mission to save him.

She would probably be outraged. Umbridge is a strict and conservative character in the original series. Fanfiction often contains ideas that deviate from the 'canon' she adheres to, and she might see it as a threat to the 'proper' understanding of the wizarding world she believes in.