Well, it could be about Harry using his magic in a new and unexpected way. Maybe he discovers a new spell that changes the course of his life at Hogwarts.
It could also be that Harry's magic in this fanfiction is somehow enhanced or different. He could be in a situation where he has to rely on his magic more than ever, like in a battle against a new dark force. And his magic might have some unique twists, for example, it could be combined with elements from other magical cultures.
Well, perhaps Harry could be trained in some long - lost or dark magic that Dumbledore has been hiding from him. This new training might make him even more powerful than before, able to defeat Voldemort in a more spectacular way.
Well, it could be about Harry Potter becoming the ultimate ruler of the magic world. Maybe he discovers some ancient magic that gives him the power to control all aspects of magic, from Hogwarts to the Ministry of Magic. He might use this power to bring about a new era of peace and harmony among wizards and witches, while also dealing with the dark forces that still lurk in the shadows.
One possibility could be that Harry is cursed by a dark wizard. This curse slowly drains his magic, causing him to struggle with everyday wizarding tasks. He might have to rely more on his non - magical skills and the help of his friends. For example, Hermione could use her vast knowledge to find a way to reverse the curse while Ron provides emotional support.
It could be about a hidden part of Hogwarts that serves as a magic sanctuary. Maybe some students discover it by accident and find ancient spells or magical creatures there.
One possible plot could be that Harry discovers his unique connection to Lady Magic early on. This newfound knowledge gives him even greater power and a different perspective on his battles against Voldemort. He might be able to access magic in ways that others can't, and use it to protect his friends more effectively.
In a 'Harry Potter left magic behind' fanfiction, the plot could involve Harry feeling guilty about all the destruction magic has caused. So he abandons it and starts anew in a remote place. He tries to build relationships with Muggles based on honesty. But as time passes, he realizes that magic is a part of him and he has to find a balance. Maybe he starts teaching some Muggles about the good side of magic in a very discreet way to help them better understand the world around them.
The plot could involve the trio being transferred to Hogwarts as part of an exchange program between their world and the wizarding world. At Hogwarts, they face challenges like dealing with the strict rules of the school, which are very different from what they are used to in Hetalia. They also have to learn how to play Quidditch, which is a completely new sport for them.
Maybe Harry is in a dire situation where he needs a powerful source of magic to defeat Voldemort, and Bellatrix's magic seems like a viable option.
In a Harry Potter air dragon slayer magic fanfiction, the plot might revolve around Harry's discovery that he has an ancestral gift of slaying air dragons. This gift was passed down through generations but was lost in history. As he delves deeper into this newfound ability, he discovers that there are different types of air dragons, some good and some bad. The bad ones are being controlled by a dark force that wants to use them to take over the wizarding world. Harry has to figure out how to distinguish between the good and bad dragons, and use his slaying skills only on the ones that pose a threat. He also has to deal with the fact that some of his classmates are jealous of his new power and try to undermine him, but in the end, he overcomes all obstacles and saves the wizarding world from the dragon - controlled menace.
One possible plot could be Harry using his unique experiences to reform the Ministry. He might start by getting rid of any remaining Death Eater sympathizers in the Ministry. He could also focus on improving the education system for young wizards and witches, perhaps by introducing more practical and ethical magic teachings. And he would surely strengthen the Ministry's defenses against the Dark Arts, having faced Voldemort himself.