Well, Harry is the central figure for sure. But in addition to him, depending on how the story unfolds, there could be other characters from both the Harry Potter and Star Wars universes. For instance, Dumbledore could play a role, perhaps guiding Harry on how to incorporate this new knowledge of the Force into his life. And from Star Wars, Luke Skywalker could be another main character, mentoring Harry on the ways of the Force.
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.
The 'harry learns both sides of the force fanfic' might be a story where Harry is thrust into a situation where he discovers the duality of the Force. It could show his journey as he tries to understand the good and bad aspects of this powerful energy. For example, he might meet characters from the Star Wars universe who teach him about the Force, and he then uses this knowledge in his own battles or moral dilemmas back in the wizarding world.
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.
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.
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.
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 as it's about him learning lost arts.
Obviously, Harry would be one of the main characters. Since it's about him learning family magic.
Maybe a new exchange student from a far - off wizarding world where the concept of the Force exists comes to Hogwarts. This student notices Harry's strong magical abilities and decides to introduce him to the Force, starting his learning journey.
There could be his drill sergeant, a tough but fair character who helps shape Harry into a good air force member. Maybe a fellow recruit named Tom who becomes his best friend and they support each other throughout their training.
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.