A third plotline could be that Harry's choice of electives attracts the attention of a new and mysterious teacher. This teacher has their own agenda and uses Harry's interest in the electives to manipulate him into doing things that may or may not be in his best interest. It could lead to a lot of self - discovery for Harry as he tries to figure out the teacher's true motives while also enjoying his electives.
One popular 'harry takes different electives fanfic' could be 'Elective Adventures of Harry'. In this fic, Harry decides to take some really unique electives like Ancient Runes and Muggle Studies at the same time. It shows his struggle to balance the workload but also his eagerness to learn different aspects of the wizarding world.
A possible plotline could be Harry being sent to a different school as part of an exchange program. At the new school, he has to prove himself all over again. He meets new friends and enemies. For instance, if it's Beauxbatons, he might be challenged by the students who think he's just a famous name from Hogwarts and not really that talented.
A possible plotline could be that they are on the run from the Ministry of Magic. Sirius knows some secrets about Harry's past that make it dangerous for them to stay in England. So, they head to a far - off magical land where they try to start a new life in hiding.
He might take classes like Ancient Runes or Care of Magical Creatures instead of the usual ones.
Another plot could involve Harry being tricked into taking the Dark Mark. He might think he's doing something else, like a magical experiment or a ritual to save someone. But it turns out it was a setup by a dark wizard. Harry then has to face the consequences, not only the physical and magical changes brought by the Dark Mark but also the change in how others perceive him, especially his friends who might be shocked and scared.
One possible plotline could be Naruto trying to find a way to visit the Harry Potter world. He might search for some kind of magical portal or a powerful spell that can transport him there. Another plotline could be Naruto using the ideas from Harry Potter books to improve his ninja techniques. For example, he could learn about the concept of wandless magic and try to apply it to his chakra control.
A plotline could involve Petunia having a change of heart due to a magical event. For instance, she might accidentally stumble upon some of Harry's magic or receive a message from the wizarding world about his importance. This could lead her to stand up against Vernon and protect Harry. She could then start to teach Harry about his mother's side of the family and the magic that runs in his veins in a more positive way than the Dursleys ever did. And perhaps she even helps him develop his magic skills secretly before he goes to Hogwarts.
One possible plotline could be that Harry, being a wizard from the magical world of Harry Potter, somehow gets involved with the dark and supernatural world of Hellsing. His magical abilities might be a source of both intrigue and conflict. Maybe he uses his magic to help the Hellsing organization in their fight against vampires and other dark creatures, and during this process, he falls in love with a character from Hellsing and they get married.
Perhaps the hickey is a result of a romantic encounter with a mysterious character. And the fic could revolve around Harry trying to figure out his feelings for this person while also dealing with the physical evidence of their closeness. The plot could also involve his friends noticing the hickey and teasing him or being concerned about him.
One possible plotline could be that Harry is cursed and slowly turns into a dragon. As he changes, he has to deal with the physical and mental challenges of this transformation. His friends would try to find a way to reverse the curse while Harry struggles to control his new instincts.