Well, it could be that there's a spell gone wrong that turns Harry into a werewolf. As a result, he is shunned by some in the wizarding world, but he also finds a community of outcasts, including other werewolves. Together, they work towards changing the perception of werewolves in the wizarding society and Harry also has to figure out how to control his new form.
One possible plot could be that Harry is bitten by a werewolf during one of his adventures outside of Hogwarts. He then has to struggle with his new identity as a werewolf. He might face discrimination from some in the wizarding world who fear werewolves. He could also try to find a way to control his transformations, perhaps with the help of his friends like Hermione who would research potions or spells to ease his condition.
Hermione would definitely be one of the main characters. She would be trying to research a way to either reverse Harry's transformation or help him control his werewolf side. Ron might also be there, at first a bit scared but then standing by Harry's side.
The Ministry of Magic could be a main antagonist. They have a history of being discriminatory towards werewolves. They might see Harry as a threat now that he's a werewolf and try to lock him up or restrict his movements. For example, they could pass new laws specifically targeting him, like making it illegal for him to attend Hogwarts as a werewolf.
The story could start with Harry having a near - death experience where a Dementor's kiss was almost upon him. Instead of being terrified, he becomes oddly fascinated. He begins to research their origin, their connection to Azkaban, and their role in the wizarding world. As he does this, he discovers some ancient magic related to Dementors that no one else knew. This knowledge could either lead him down a dark path or help him to change the way Dementors are perceived in the wizarding community.
Well, it could be that Harry discovers some ancient magic that transforms him into a god - like figure. He might gain powers like super strength, the ability to control the elements, and the power to see into the future. Maybe he uses these powers to protect the wizarding world from a new, even greater threat than Voldemort.
Maybe in the fanfiction, Harry becomes a prefect and it makes the Slytherins jealous. They start to plot against him, trying to get him removed from the prefect position. Harry then has to use his wits and newfound authority to deal with their schemes. He might also use this opportunity to improve relations between Gryffindor and other houses. He could start inter - house study groups which are initially met with resistance but eventually become a great success.
The plot of 'harry becomes a healer fanfiction' could be really interesting. Maybe Harry gets tired of all the fighting and danger after the big battles. He realizes that he wants to help people in a more positive and long - lasting way. So, he chooses to be a healer. He has to study hard, learning about all kinds of potions and spells for healing. He also has to deal with the politics within the medical field in the wizarding world. Some old - fashioned healers might not like Harry's new and innovative ideas at first, but he gradually wins them over with his skills and determination.
Well, perhaps Harry discovers some long - lost diaries or artifacts of the Marauders. This leads him to idolize them and want to follow in their footsteps. He might start using their prank tactics against his enemies at Hogwarts.
Well, perhaps Harry discovers the Avengers through some magical means like a spell gone wrong that transports him to the MCU world. He could be in awe of their powers and decide to learn from them, and then try to incorporate their fighting styles into his own magical battles.
In the fanfiction, it could be that Harry's transformation into a phoenix is related to some ancient magic. As a phoenix, he could be able to communicate with other magical creatures in a way he couldn't before. And his presence as a phoenix could have a significant impact on the wizarding world, perhaps bringing a new era of peace or change.