In 'batman learns magic fanfiction', perhaps he teams up with magical characters. He could learn from Zatanna, for instance. Their combined skills would make for an exciting story as they take on threats that are both physical and magical in nature. Batman's logical mind might find new ways to apply magic that the magical community hadn't considered before.
Even Constantine could be a potential teacher. He has a lot of experience with the darker side of magic. He could show Batman how to deal with curses and dark magic that might be used against Gotham. Although their methods might not always align, Constantine's knowledge would be invaluable to Batman in his magic - learning journey.
Well, perhaps Percy discovers a hidden magic within himself that he didn't know he had. Maybe he starts off struggling with basic spells and then gradually masters more complex ones. For example, he could be trying to make objects levitate at first and later on be able to conjure powerful shields.
One interesting story could be Harry's initial struggles. He might face challenges like accidentally causing chaos as he tries to control his wandless magic. For example, he could make objects fly uncontrollably in the Gryffindor common room. Another aspect could be his secret training sessions. He might find a hidden place in Hogwarts, like an abandoned classroom, to practice without others knowing.
Perhaps in the fanfiction, Harry has an encounter with a mysterious magical creature early in his life that imparts special knowledge of magic to him. This early knowledge gives him an edge in his Hogwarts studies and adventures, like being able to solve complex magical puzzles with ease.
In this type of fanfiction, a great plotline could be that Harry stumbles upon a hidden family grimoire. Inside, he finds magic that was thought to be lost. For example, there could be spells for creating protective shields that are stronger than any known spell. Or perhaps he discovers family magic that is related to time - travel, which he then has to learn to control carefully so as not to disrupt the timeline. This discovery of family magic would add a whole new layer to his character development and his role in the wizarding world.
There are fanfictions where he learns elemental magic in a new way. For example, being able to combine fire and water magic in a unique and powerful way that was not explored in the original books. He could use this to create new defensive or offensive spells against dark wizards.
One interesting plotline could be Harry discovering a new and ancient form of magic that was lost for centuries. This could lead him on a journey to understand its origin and how to master it.
One great plot development could be that the elemental magic Harry learns is not part of the traditional Hogwarts curriculum. So, he has to seek out hidden mentors or ancient texts. This could lead to him exploring parts of the wizarding world that are long forgotten. As he delves deeper into elemental magic, he might also start to question the limitations of the magic he has been taught so far at Hogwarts.
In the fanfiction, it could be that Harry's learning of Black family magic unlocks a new power within him. This power could be related to his connection with the Black family through Sirius. He may then use this power to fight against the rising dark forces in the wizarding world, in a way that is different from the traditional magic he has been taught.
Perhaps it's a magical crystal that enhances his ability to communicate with magical creatures. This would be quite unique as it would give him an edge in dealing with things like thestrals or unicorns, and open up new storylines in the fanfiction. Harry could use this crystal to understand their needs and gain their help in various situations.