One possible plot could be that an ancient magic in the Harry Potter world is somehow connected to King Ghidorah. Harry, through a series of mysterious events, starts to have visions of King Ghidorah and realizes he is meant to merge with this powerful being. As he does so, he has to deal with the fact that the Ministry of Magic might see him as a threat. Meanwhile, Voldemort wants to use Harry's new connection to King Ghidorah for his own evil purposes. Harry has to navigate all these challenges while also trying to understand his new identity.
Well, perhaps Harry discovers he has some hidden power that is related to King Ghidorah. Maybe he can transform into King Ghidorah - like form in times of great danger at Hogwarts, using his new - found abilities to protect the school from dark wizards. The other characters would be both amazed and a bit scared of this new Harry.
In a 'Harry Potter is King Ghidorah' fanfiction plot, it could start with a strange magical artifact being discovered at Hogwarts. When Harry touches it, he is suddenly linked to King Ghidorah. This link gives him the ability to control some of King Ghidorah's powers, like flight and powerful energy blasts. But it also attracts the attention of dark forces. Hermione and Ron are initially confused but then help Harry figure out how to control his new powers. As the story progresses, Harry has to use his combined Harry Potter and King Ghidorah powers to fight against an even greater evil that is emerging in the wizarding world, all while trying to keep his secret from falling into the wrong hands.
One possible plot could be about how the other kaiju react to King Ghidorah's pregnancy. Maybe Godzilla would be initially shocked and then start to consider if this new situation changes the power balance among them.
In the world of fanfiction, it could be another powerful kaiju. Maybe a new, mysterious kaiju that was introduced into the Monsterverse secretly. This new kaiju could have some special abilities that were passed on to King Ghidorah's offspring.
Well, perhaps in this fanfic, Harry Potter discovers some long - lost connection to Russia. Maybe he's the heir to a powerful Russian wizarding family. He could use his magic in a unique way influenced by Russian magic traditions, like using spells related to Russian folklore creatures.
Perhaps in this fanfiction, Harry Potter becomes the King of Gringotts due to some prophecy or a special gift he has. As the king, he could start to reform the goblin - wizard relations. He might introduce new policies in Gringotts that benefit both wizards and goblins, which would lead to a whole new set of adventures and challenges as he tries to balance the different interests.
One possible plot could be that Harry Potter, through some magical accident or powerful spell, is transported to Westeros. He might use his magical abilities to quickly rise in power, perhaps by impressing the local lords with his feats of magic. He could then set out to unite the kingdoms under his rule, using a combination of wizardry and political savvy that he learned from his time at Hogwarts and in the wizarding world.
Maybe Harry discovers he has some hidden connection to Atlantis. He could be magically transported there and due to his powerful magic and heroic nature, he ends up becoming the king. He then has to deal with Atlantis's internal politics and protect it from external threats.
One possible plot could be that Harry discovers he has some long - lost royal blood. He then has to navigate both the wizarding world and the political intrigues of the English court as he tries to balance his newfound status as a potential king. Magic could be used to solve problems within the monarchy, like protecting the king from dark magic threats.
One possible plot could be that Harry discovers he has a hidden connection to the vampire world and is actually the heir to the 'King of Vampires'. He then has to balance his life at Hogwarts with his newfound vampiric identity, facing challenges from both the wizarding world that may fear him and the vampire world that may have its own power struggles.
Well, it might be about Harry Potter using his magic in a street - level setting, like maybe he's using magic to solve the problems of the common people on the streets. He could be like a secret hero among the street folk.
Well, it could be about Harry Potter somehow becoming the king in the North. Maybe he uses his magic in a new way to gain this position, ruling over a magical kingdom there.