A possible plotline could involve Harry being transported to the world of Alduin and being mistaken for Alduin at first. As he tries to figure out what's going on, he has to learn about Alduin's powers and how to control them. Meanwhile, the real Alduin might be on the loose and Harry has to either stop him or find a way to co - exist with him. There could also be a plot where Harry uses his knowledge from the wizarding world to bring about new changes in the world of Alduin, which might be met with resistance or acceptance from the natives of that world.
One possible plotline could be Harry struggling to keep up with his magical training due to his anemia. He might have to find alternative ways to gain strength for spells.
One possible plotline could be Harry struggling to accept hugs or physical contact from his friends, causing misunderstandings among them.
One possible plotline could be that Harry somehow gets transported to the world where Izaya exists and they form an unlikely alliance. Maybe they team up to solve a mystery that is plaguing both their worlds.
Well, a plotline might involve Harry being hunted by those who oppose the mixing of wizard and vampire lineages. Or perhaps he is the key to a prophecy that involves both the wizarding and vampire worlds. It could also be that he has to hide his newfound heritage from his friends at Hogwarts for fear of being ostracized. There could be a lot of internal conflict as Harry tries to understand his place in this new family tree and what it means for his identity.
One possible plotline could be Harry being easily tricked by dark wizards who take advantage of his naivete. For example, they might convince him to perform dangerous spells or go to forbidden places. Another could be that he misinterprets the intentions of his friends, causing some rifts in their relationships until he eventually learns the truth. Maybe he also gets involved with some new magical creatures that he wrongly believes are harmless because of his naivete.
Perhaps in some 'harry marries snape fanfiction', there could be a magical accident that binds their fates together. At first, they resist the connection, but as they get to know each other better, they find common ground and fall in love, leading to marriage. This could involve a lot of emotional turmoil and self - discovery for both characters.
One possible plotline could be about the Weasley family trying to improve their financial situation. Maybe they come up with a new business idea in the wizarding world, like a magical product that becomes a huge success and changes their economic status. Another could be a story about how the Ministry of Magic regulates the financial system in the wizarding world, and there are some characters who try to manipulate or reform it.
Maybe the plot could revolve around Harry's past life memories as Obito influencing his decisions in the Harry Potter series. For instance, his views on friendship and sacrifice might be altered. Also, it could be that he tries to find a way to bring back someone he loved, just like Obito did, but in the context of the wizarding world, perhaps trying to resurrect a fallen comrade like Sirius Black or Cedric Diggory.
One possible plotline could be Harry using his vegan lifestyle to promote animal rights in the wizarding world. He might start a club or campaign within Hogwarts to encourage others to be more conscious about their food choices.
One possible plotline could be that Harry, as a submissive dragon, is forced to follow the commands of a more powerful dragon or wizard. He might struggle against this submissive role and try to break free.