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 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.
Maybe Harry leaves the wizarding world and uses his magical skills in the muggle world as a mercenary. He could be hired for dangerous jobs that require a touch of magic but need to be kept secret from the muggles.
A possible plotline could be that Harry's basilisk - related Animagus form is a result of some ancient magic that was dormant in him. The Ministry of Magic might see this as a threat and try to hunt him down. Meanwhile, Harry has to figure out how to use his new form to protect himself and his friends. He might meet other Animagi who have similar but different forms, and they could either help or hinder him. Along the way, he could also discover new spells or powers that are related to his Animagus form and use them to fight against the dark forces in the wizarding world.
A possible plotline could be that Voldemort has a change of heart. Maybe he realizes that Harry has some power or knowledge that he needs, so he decides to carry Harry away to a secret location to extract that information from him.
One possible plotline could be that a new strain of magical typhus breaks out in Hogwarts. The students and teachers have to figure out how to contain it while also dealing with the regular Hogwarts drama. Maybe Hermione tries to research a cure using both magic and Muggle medicine knowledge.