Hermione could also be a main character. Since she loves to study and research, she might help Harry in his search for the lost arts. She could be the one to find the initial clues or books related to these arts.
Ron might be involved too. He may not be as enthusiastic as Hermione about the lost arts at first, but his loyalty to Harry would make him join in the adventure. There could also be some new characters introduced, like an old wizard who teaches Harry the lost arts or a rival who also wants to get hold of these powerful and forgotten magics.
Obviously, Harry would be one of the main characters as it's about him learning lost arts.
It could be about Harry Potter learning some long - forgotten or lost magical arts. Maybe he discovers ancient spells, potion - making techniques that have been lost for centuries, or unique forms of divination that are no longer practiced in the wizarding world.
Obviously, Harry Potter is the main character. He is the one who is learning the Dark Arts. Then there might be his friends like Hermione Granger and Ron Weasley. They could be either supporting his new path or trying to stop him. There may also be new characters created specifically for the fanfiction, such as a secretive Dark Arts master who takes Harry under his wing.
In the 'Harry Learns Alchemy' fanfic, Harry is the central figure. He is on a journey of learning alchemy. Hermione would be a key character as she is very studious and would be eager to help Harry understand the complex concepts of alchemy. There could be a mysterious old wizard who acts as a mentor to Harry in his alchemical studies. And Ron, as Harry's best friend, would be around, maybe not fully understanding alchemy but being supportive in his own way.
There could be his arithmancy teacher as a main character too. This teacher might be strict but also very knowledgeable, guiding Harry through the difficult subject.
Obviously, Harry Potter is one of the main characters as it's about him learning magic. He is the central figure around which the story revolves.
Obviously, Harry would be one of the main characters. Since it's about him learning family magic.
Since it's about Harry learning the old ways, Harry Potter is surely one of the main characters. There might also be some old - time wizards or witches who teach him the old ways.
Obviously, Harry would be one of the main characters. Since it's about him learning about the Force. There might also be some Star Wars characters if it's a crossover. Maybe a Jedi like Obi - Wan Kenobi could be there to teach Harry about the Force, or a Sith to show him the dark side.
Obviously, Harry is a main character. Hermione might also be there as she is good at potions and can help Harry. And Snape could be a prominent figure as he is the potions teacher.
Obviously, Harry is one of the main characters since it's about him learning parselmagic.