What are some interesting plot ideas for 'Harry Potter King of Monsters' fanfiction?

One idea could be a story where the monsters in Hogwarts form an alliance to protect the school from a new dark threat. Maybe the trolls, centaurs, and merpeople work together with the students.

Perhaps there could be a tournament where the students have to combine their wizarding skills with Duel Monsters strategies. A character could be really good at using Fire - based spells and then pairs that with Fire - type Duel Monsters cards. They would need to learn how to balance the two forms of combat to win the tournament.

One idea could be that Harry, as king, uses his magical knowledge to create a new system of governance in the wizarding world. He could establish laws that ensure fair treatment of all magical creatures, for example, giving house - elves proper wages and rights. Another plot could involve him facing challenges from traditional pure - blood families who oppose his more inclusive style of ruling.

Perhaps the wolf king has a prophecy related to Harry Potter. It could be foretold that the wolf king will either help or hinder Harry in his fight against Voldemort. This would create a whole new dynamic where Harry and his friends have to figure out how to deal with this new element in their battle. They might need to seek out the wolf king and try to understand its motives.

The mafia king could be a new threat that emerges after Voldemort's defeat. He sees the power vacuum in the wizarding world and decides to take over. Harry, being the hero, has to gather his old friends and some new allies to face this new menace. The fanfiction could explore how the wizarding world has changed after the big war and how it copes with this new type of threat.

Perhaps a plot where the wizard king is from a different magical realm and comes to the Harry Potter universe. He has to adjust to the different magical customs here while also trying to solve a mystery that involves a powerful magical artifact that was lost long ago. This could involve him teaming up with Harry and his friends and teaching them some new magical techniques from his own realm.

One interesting plot idea could be the discovery of a hidden connection between Harry Potter and the Dragon King. Maybe the Dragon King has some long - lost magic that only Harry can unlock, leading to a whole new adventure in the wizarding world.

One idea could be that the Fairy King has a secret alliance with Dumbledore. They work together to protect a powerful magical artifact that Voldemort is also after. Another could be the Fairy King taking Harry Potter under his wing to teach him unique forms of magic not taught at Hogwarts.

One idea could be exploring Harry's journey in Azkaban in more depth, like how he copes with the dark and gloomy atmosphere. Maybe he discovers some long - forgotten secrets within the prison walls.

One idea could be that Harry discovers his connection to the demons due to an ancient family secret. Maybe his ancestors made a pact long ago. Another could be that he has to use his new 'King of Demons' powers to fight a dark wizard who is trying to control the demon realm for evil purposes. He could also face challenges within the wizarding world as they fear his newfound powers.