Perhaps the Muggle Prime Minister is accidentally affected by a spell that makes him see magical creatures everywhere. He then has to deal with the chaos while also trying to keep it a secret from the public. He might start to question his own sanity until a wizard comes to his aid.
In a more complex plot, the Muggle Prime Minister could be visited by Dumbledore who warns him of an upcoming threat that will endanger both the wizarding and Muggle worlds. The Prime Minister has to then make difficult decisions about how much he can involve his Muggle government in a magical crisis without causing mass panic. He has to balance the secrecy of the wizarding world with the safety of his own people.
A cool plot could be that a wizard decides to study at a Muggle school to understand Muggle culture better. He might struggle with basic Muggle things like using a calculator or writing with a pen instead of a quill. Meanwhile, he could use his magic in very subtle ways to help his Muggle classmates, like making a wilted plant in the classroom come back to life. This would create a lot of humorous and heartwarming situations as he tries to fit in.
One idea could be a Muggle-born wizard who tries to hide their magical abilities in Muggle society while also secretly helping other wizards in need. For example, they could use magic subtly to fix things around their Muggle neighborhood, like making a broken streetlight work again without anyone suspecting it was magic.
Hermione Granger could be involved. She's smart and might take an interest in how the Muggle government operates. She could help the Prime Minister understand the wizarding world better. Another character could be Arthur Weasley. His fascination with Muggle objects would make for some humorous interactions with the Prime Minister and also help bridge the gap between the two worlds.
One interesting fanfiction could be where the Prime Minister has to deal with a magical crisis in the Muggle world that is somehow connected to Hogwarts. Maybe the dark forces are using Muggle technology against the wizarding world and the Prime Minister has to work with the Ministry of Magic to stop it.
Well, one possible plot could be that Harry uses his magic to combat various threats to the country that normal politicians can't handle. Like using spells to stop terrorist attacks or natural disasters. He might also have to hide his magic from the public while still using it for the greater good.
I'm not sure specifically if there is a well - known 'Harry Potter is the Prime Minister' fanfiction. But given the vastness of the fanfiction community, it's entirely possible. Fanfiction allows for all kinds of crossovers and alternate universes. So, someone might have written a story where Harry Potter, with his magical abilities and heroic nature, steps into the role of the Prime Minister to solve both magical and non - magical problems in a unique way.
There could be a fanfic where the Prime Minister discovers he has some latent magical ability due to his close association with the wizarding world. In this story, he could start learning basic spells and charms, all while trying to keep it a secret from the public. This would add an interesting twist to the typical relationship between the Muggle and wizarding worlds.
Perhaps in a fanfiction, the Minister of Magic is under the influence of a powerful dark charm, and Harry Potter has to find a way to break it without causing chaos in the wizarding world. He might have to team up with unlikely allies from different houses at Hogwarts. This could involve a lot of character development and exploration of the relationships between different wizarding factions.
One possible plot could be that the Prime Minister has to seek help from the wizarding world led by Harry Potter to deal with a dark magic threat that is seeping into the Muggle world. For example, strange magical creatures are starting to appear in London and causing chaos. Harry Potter and his friends then work with the Prime Minister's office to figure out a way to send these creatures back to their proper magical realm and also put up wards to prevent further incursions.
If Harry Potter became prime minister, the interaction between the wizarding world and the Muggle government would be quite complex. First, Harry would have to keep the wizarding world's secrets. He might create a special liaison team of wizards and witches who are well - versed in Muggle affairs to communicate with the Muggle government departments. For example, they could work on issues like preventing magical accidents in Muggle - populated areas. Second, he could introduce some magical concepts to improve Muggle life in a discreet way, like using magic to clean up environmental pollution without revealing magic's existence.