The magic of transfiguration could be very useful. Harry could transfigure objects into barriers to stop the zombies from advancing. For example, he could turn a simple stick into a large, impenetrable wall. Also, his ability to Apparate would allow him to quickly move around the battlefield, dodging zombie attacks and getting to strategic positions.
His basic spells like Stupefy could be used to stun the zombies. It would give him time to figure out a more permanent solution.
The magic of Aphrodite could interact with the protective spells in Hogwarts. Maybe her love - based magic could make the protective spells stronger by creating a positive emotional bond between the castle and its inhabitants. On the other hand, if her magic goes out of control, it could weaken the spells as the strong emotions she brings might disrupt the delicate balance of the existing magic.
Well, Harry's magic can give him an edge in many ways. For instance, he could use a simple levitation charm to make Dudley's feet leave the ground, which would be quite disorienting for Dudley and put Harry in a position of power.
He would become more humble. Losing his magic would make him realize that he's not invincible. He'd start to value the people around him more. For instance, he'd be more grateful for Hermione's intelligence and Ron's loyalty.
His magic would probably be seen as something very strange. Most students and teachers would have no idea about magic, so they might think he's just doing really elaborate magic tricks at first. But if he ever had to use his magic to protect someone, it would be a real shock to everyone.
Harry Potter's magic is based on incantations and wands in his world. In Equestria, magic seems to be more instinctive for the ponies. So when Harry arrives, his magic could be seen as very foreign. His magic might not function properly without the right magical environment. For instance, the magic that he uses to apparate might not work in Equestria because the space - time continuum there could be different. He would have to figure out how to make his magic work within the framework of Equestria's magic system, which could be a long and interesting process in the fanfiction.
His magic might be seen as very different. Japanese magic could have its own style and rules, so Harry's spells might seem strange at first. But also, his powerful magic from fighting Voldemort would likely earn him respect.
Harry's magic would be a game - changer. He could use Apparition to quickly move around the battlefield and surprise the enemy. His ability to communicate with snakes (Parseltongue) might also be used to gather intelligence if there were any snake - related codes or secrets in the Axis powers. Plus, his experience in fighting dark wizards like Voldemort would give him the strategic edge in combat against the Axis leaders.
Harry's bravery, which was one of his most prominent traits, would be very useful in the often - dangerous world of Westeros. He might be more willing to take risks than the average Targaryen. His kindness too would play a role. He could be the one to show mercy in a world where mercy is sometimes seen as a weakness. He would probably adapt his Hogwarts - learned values to fit the different cultural context of Westeros.
Harry might have an easier time with spells related to transformation. Just as Poseidon can change the form of water, Harry could be more adept at transfiguration spells. He could also have a natural ability to breathe underwater and perform magic while submerged, which would be a huge advantage in certain situations. This would open up new possibilities for him in both the wizarding world and any underwater adventures he might have.
His magic might develop in a more instinctive and self - taught way. Without the guidance of Hogwarts professors, Harry would have to figure out his magic on his own. He might use it more for survival and self - defense against the threats that Jason's world presents. For example, he could use magic to create barriers or traps to keep enemies at bay.