Well, Harry Potter's magic would likely have to be somewhat concealed in the RAF. But he could still use it in clever ways. His levitation charm could be adapted to help with loading and unloading equipment more easily. And his Patronus charm might be used as a distress signal in a way that only the RAF members in on his secret could recognize. Also, he could use spells to make the pilots more alert and focused during long flights.
His magic could be used for defensive purposes. For example, he could create magical shields around the planes to protect them from enemy attacks. Magic could also be used for navigation, like a spell that always points towards the base or the target.
In a fanfiction scenario where Harry joins the Royal Air Force, his magic would need to be integrated carefully. His ability to apparate could potentially be used in emergency situations, but it would have to be done secretly. His knowledge of spells for disguising himself could be used for undercover operations. His magic could also be used to analyze the composition of the air around the planes, which could be useful for predicting weather changes or detecting harmful substances. He would have to find a balance between using his magic to help the RAF and keeping it a secret from those who might not understand or accept it.
Well, he might use his magic in very unique ways within the RAF. Maybe he'd create some sort of magical protection for the planes or use spells to enhance the pilots' skills. It could be really interesting to see how his wizarding abilities interact with the military technology of the RAF.
Harry would likely struggle at first. He's used to the more egalitarian wizarding world, so the strict hierarchies of royal life would be a shock. He'd have to learn all the courtly etiquette, like how to address nobles and how to behave in formal ceremonies.
In this fanfiction, magic as 'the force' could mean that there are new ways of using it. Maybe instead of just waving wands and saying incantations, wizards can now use magic in a more fluid and internal way. Similar to how in Star Wars, the force can be used for things like mind tricks or enhanced physical abilities. Here, magic could be used for more than just the traditional spells. For example, a wizard could use this new understanding of magic as 'the force' to levitate themselves without a broomstick or communicate telepathically with other wizards. It could completely change the dynamics of how magic is used in the Harry Potter universe.
If Harry is reborn as Percy, his magic would likely be influenced by the water - based powers Percy has. He could use water to conduct his magic, similar to how Percy can control water. His magic could also be affected by the presence of Greek gods. They might either enhance or restrict his magic depending on their relationship with him.
He'd adapt well. Harry has always been a leader. As a professor, he'd be able to lead students in their studies. He's patient too. Remember how he helped Neville with his magic? That patience would serve him well when teaching students who might be struggling.
He'd first have to get used to the new technology. If there are new magical devices, he'd need to learn how to use them. For instance, if there are advanced wands with extra functions, it would take him some time to figure them out.
Harry Potter would adapt to Pandora in fanfiction by relying on his adaptability skills that he developed in the wizarding world. He'd have to figure out how his spells interact with Pandora's elements. For example, his fire - making spells might behave strangely. He would also need to adapt to the social structure of the Na'vi. He might use his invisibility cloak to spy on them at first to understand their customs better, and then gradually integrate into their society.
Harry would rely on his basic values. His loyalty and courage would still be his strong suits. He might join a group of young wizards who are working on some noble cause in the future magic world. Through interacting with them, he'd gradually understand the new rules and customs. For example, if there are new dueling regulations, he'd learn them in the process of joining friendly duels.
His magic might become more physical. Instead of just waving a wand, he could use ki to direct spells. For example, his Patronus charm could be charged with ki energy, making it stronger and more tangible. Maybe his spells would be instant like Goku Black's attacks, no need for long incantations.
He'd have to adapt his magic to fit in. Maybe he'd learn to use it more discreetly, as ninjas are all about stealth. He'd also need to get used to the ninja hierarchy and respect the local rules.