One idea could be that Harry has to hide his new werewolf form from his friends at Hogwarts. He might struggle with the stigma associated with werewolves in the wizarding world, even though his friends know him well. Another could be that he discovers new magical abilities related to his werewolf form that help him in his fight against Voldemort. For example, enhanced senses that allow him to detect dark magic more easily.
In this fanfiction scenario, Harry becoming a werewolf could cause a rift in the wizarding community. Some might see him as a threat, while others, like the Weasley family, would stand by him. The story could focus on how he copes with this new identity. He could start to understand the werewolves' perspective more, and try to bridge the gap between the wizarding world and the werewolf community. He might also have to deal with the Ministry of Magic's attempts to control or eliminate him because of his new form.
One idea could be that as a girl, Harry has to deal with different social expectations in the wizarding world. For example, she might face more restrictions on certain adventures compared to when she was male. Also, her relationships with Ron and Hermione could change in interesting ways. Ron might be more protective, while Hermione could become a closer confidant as they share more 'girl - specific' experiences.
One idea could be a werewolf character finding their true mate among the Harry Potter characters. Maybe a werewolf who has always felt like an outcast in the wizarding world finally meets someone who accepts them completely. This could lead to a story of self - discovery and acceptance for both the werewolf and their mate.
Well, perhaps in the fanfiction, Harry becoming a werewolf leads to a rift between him and some of his friends who are afraid of him now. But then he meets other werewolves who teach him how to control his transformation and he uses this newfound control to his advantage in the fight against the dark forces. He could also form an alliance with the werewolves in the wizarding world, which changes the power dynamics.
The young werewolf could be the key to a mystery at Hogwarts. Maybe there are strange disappearances during the full moon and the young werewolf is wrongly suspected. The real culprit could be a dark creature using the werewolf's presence as a cover. Harry and his friends could believe in the young werewolf's innocence and work to clear their name. They might discover that the young werewolf has a unique power that can help defeat the real enemy.
One idea could be Harry Potter arriving in Skyrim and using his magic to combat the dragons. Maybe he teams up with the local mages and they learn from each other's magical techniques.
One idea could be exploring what would happen if a new, mysterious student joined Hogwarts during the Triwizard Tournament. This student could have a hidden agenda related to the Dark Arts and start influencing the events of the tournament in unexpected ways.
One interesting plot idea could be Harry's return to Hogwarts as a teacher. He could pass on his unique experiences and knowledge to the new generation of students.
One idea could be a dragon that forms a bond with Harry and helps him in his battles against Voldemort. Maybe the dragon has some special powers that are crucial for Harry to win.
One idea could be Harry and his friends exploring new magical realms that were previously unknown. Maybe they discover a hidden school of magic that has a different approach to teaching spells.