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.
Well, it could be that the Dragon King has a secret lair filled with ancient magical artifacts that Harry stumbles upon. These artifacts hold the key to solving a mystery that has been plaguing the wizarding world for centuries. Harry, with his inquisitive nature and Gryffindor courage, decides to team up with the Dragon King to figure out the mystery and in the process, they have to battle against those who want to use the artifacts for evil purposes.
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.
One plot idea could be that the fem dragon is a guardian of an ancient wizarding artifact. Harry discovers this and has to team up with the dragon to protect it from dark wizards. Another idea is that the dragon is an outcast in the magical world and Harry befriends it, leading to a story about acceptance and friendship.
One idea could be a story where a young wizard discovers an ancient dragon egg in the Forbidden Forest. He secretly raises the dragon and they form an unbreakable bond. As the dragon grows, they face challenges from Hogwarts faculty who fear the dragon's power. But together, they prove that the dragon can be a force for good.
One idea could be a story where Harry discovers he has an ancient dragon knight heritage. He then has to learn the ways of the dragon knights in secret while still dealing with Voldemort. Another could be that a dragon knight from the past is reincarnated as Harry, and he has to use his past skills to fight new threats at Hogwarts.
One idea could be a dragon guarding a mysterious puzzle that holds the key to an ancient magic. The main characters, like Harry and his friends, have to solve the puzzle while also taming the dragon. Maybe the puzzle is made of dragon scales and only a true Gryffindor can figure it out.
One idea could be a character who discovers they have a unique bond with a dragon that no one else in the wizarding world has. This could lead to them having to hide the dragon from authorities like the Ministry of Magic while also trying to understand the dragon's powers and how it can be used for good.
One idea could be a mage who can communicate with dragons and uses this ability to help Harry Potter in a secret mission. For example, the mage could get the dragons to guard Hogwarts during a big attack.
Well, perhaps a cool plot is that as a dragon, Harry discovers ancient dragon magic that has been long forgotten in the wizarding world. He then uses this magic to revive some of the lost magical creatures. Also, his interactions with other magical beings would be different. For example, he might have a unique bond with the centaurs as a dragon.
Well, in some fanfiction, the dragon fire might be used to create a new potion ingredient. For example, a young wizard discovers that by collecting the ashes of a dragon's fire when it burns a certain magical plant, it can be used to make a potion that gives temporary invisibility. Also, perhaps a dragon's fire could be used to melt a cursed object that no other magic can affect, leading to a whole new adventure for the characters.
One idea could be a new competitor from a far - off land enters the tournament. This person has unique magical abilities related to dragons that no one in Hogwarts has seen before. It would add an element of mystery and new challenges to the tournament.