Hermione Granger often remains popular. In alternate fics, she might be portrayed as an even more powerful witch, leading new magical research or changing the way magic is taught. Harry Potter himself is also a common focus, maybe with different powers or a different role in the wizarding world.
Well, one interesting concept could be a different Sorting system in Hogwarts. Maybe instead of the traditional four houses, there are new ones based on different magical abilities. Another could be an alternate version of the Ministry of Magic, with different laws and regulations regarding magic use.
In a fanfic where Harry Potter is the King of Britain, he could revolutionize the legal system. Since he has seen the flaws in the wizarding world's laws, he would create new laws that are more just. He might also use his influence to promote the study of ancient magic. Harry would use his position to bring together different magical communities within Britain, such as the centaurs, the goblins, and the house - elves, and give them more rights and representation in the kingdom.
Well, it could be about Harry Potter having reasons to flee Britain during his first year at Hogwarts. Maybe he discovers some dark secret or faces a threat that makes him feel he has to leave. It might involve new magical elements not in the original books.
Obviously, Harry Potter would be one of the main characters since it's about him fleeing. Hermione and Ron might also be involved as they are his friends and could either go with him or play a part in his decision to flee.
Perhaps in the fanfiction, the Ministry of Magic in Britain is depicted as corrupt or ineffective. Harry Potter, being a hero who values justice, would be frustrated with such a system. He might then grow to hate Britain as a whole because of this broken system that's supposed to protect its magical citizens.
In some fanfictions, it might be through the over - expenditure on magical infrastructure related to Harry Potter. For example, building huge Hogwarts - like schools all over Britain could drain the economy. Also, the cost of magical creature conservation, which is highly emphasized in the Potter universe, could be exorbitant if implemented on a large scale.
In some fanfiction, the 'Harry Potter' world might be depicted as ruining Britain by changing its social structure too drastically. For example, if the wizarding world suddenly becomes fully exposed to the Muggle world in a fanfic, it could cause chaos. Muggles might panic at the existence of magic, and the established order in Britain, both in the wizarding and Muggle parts, could break down.
In certain fanfiction, the magical education system in 'Harry Potter' could have a negative impact on Britain. For example, if Hogwarts starts to produce poorly trained wizards due to a change in curriculum or teaching staff. These incompetent wizards might then go on to make mistakes in using magic in the real world, causing accidental damage to infrastructure and endangering lives in Britain.
In these fanfics, the theme of adaptation is quite common. Harry has to adapt to his new identity, whether it's a new name, a new magical ability, or a new social standing. Another theme is the exploration of different magical cultures. If his identity is changed in a way that he's associated with a different group, like a foreign wizarding community, it delves into different magical practices. And identity crisis is also a key theme. Harry may struggle with who he is now compared to who he was supposed to be in the original story.