It's not normal considering how much Harry hates Umbridge in the original series. However, fanfic often subverts expectations. Maybe the fanfic has rewritten Umbridge in a way that makes her more appealing. For example, it could give her a tragic backstory that makes Harry see her in a different light. But overall, from what we know of Harry's feelings in the original books, it's an unexpected preference.
In the context of the original Harry Potter story, it seems quite abnormal as Umbridge is a very unlikable character to Harry. But in the world of fanfic, anything can happen. Fanfic allows for different interpretations and character developments, so while it's not normal in the traditional sense, it's possible within the creative space of fan - created stories.
One possible consequence could be that she gets fired from her position. If Harry manages to expose her actions, the wizarding school or the Ministry of Magic might not tolerate such blatant abuse of power and take disciplinary action against her.
Another way Harry could respond is with a sense of shock and disbelief at first. Given that Umbridge is supposed to be in a position of authority, Harry might be momentarily stunned that she would go to such lengths. However, his Gryffindor courage would soon kick in, and he would likely start to resist, perhaps by using his magic in creative ways to protect himself or to disarm Umbridge, all while trying to uphold the values of the wizarding world that oppose such cruel and unjust treatment.
Perhaps in the fanfic, Harry teams up with the other students to stage a large - scale protest against Umbridge. Their united front and the chaos it causes might lead to the school board or the Ministry of Magic realizing that she is not fit to be in charge at Hogwarts. Or Harry could use his connections, like his friendship with Sirius or the Order of the Phoenix members. They could dig up some dirt on Umbridge from her past that makes it impossible for her to continue teaching at Hogwarts.
In 'umbridge abuses harry fanfic', often Umbridge is portrayed as a tyrant. She might verbally abuse Harry, constantly doubting him and his claims about the Dark Lord. For example, she could publicly humiliate him in front of other students, and try to isolate him. This all builds on the canon idea of her as a very unpleasant and unjust character towards Harry in the original story.
There might be some fanfics with this concept that are written in a non - inappropriate way. However, in the official 'Harry Potter' universe, such a situation of Umbridge spanking Harry is not part of the canon. Some fanfic authors might explore this in a more comical or alternative - universe - type of scenario that doesn't involve any adult or inappropriate content. For example, they could write it as a form of extreme disciplinary action in a very different Hogwarts where the rules are warped, but still keep it suitable for a general audience.
This could imply a lot of things. Fanfic is a realm of creativity where the normal boundaries of the original story can be bent. Harry liking Umbridge fanfic could be a sign of his growing maturity in the sense that he is willing to explore different perspectives, even of someone he dislikes in the original story. It might also be that the fanfic has a unique take on Umbridge, perhaps making her a more sympathetic character, and Harry is attracted to this new interpretation.
One interesting fanfic is 'The Dark Days of Hogwarts' where Umbridge's torture of Harry is depicted in a really intense way. It shows how Harry copes with the psychological and physical pain she inflicts.
It's highly inappropriate. The relationship between Umbridge and Harry Potter is one of oppressor and oppressed in the original story. Adding such a violent and inappropriate act like spanking in a fanfic not only distorts the characters' relationship but also may have a negative impact on fans, especially younger fans who look up to the series for positive values and role models.
In certain fanfictions, Harry could get out of trouble with Umbridge through the power of truth - telling spells. He might be able to prove his innocence by using a spell that forces the truth to be revealed. Also, there could be instances where magical creatures come to his aid. For example, if he has befriended some of the magical creatures on the grounds, they could cause a commotion that diverts Umbridge's attention long enough for Harry to get away. Maybe a group of pixies start causing chaos in her office, and while she's trying to deal with them, Harry slips away unnoticed.
One possibility is that Umbridge, despite her cruel nature, sees some potential in Harry for her own gain. Maybe she tries to mold him into a perfect little wizard according to her strict and often wrong ideas. She could isolate Harry from his friends and force him to follow her rules blindly, which would create a lot of internal conflict for Harry as he tries to resist her brainwashing while living under her roof.