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.
Merlin's magic is very old and powerful. It could make Harry more attuned to the natural elements of magic. For example, he might be able to control the weather more easily during battles. His spell - casting could also become more instinctive and less reliant on wands as Merlin's magic was less wand - centric.
Batman's brooding and serious personality would likely make Harry more cautious. Batman is all about planning and preparation, and Harry would pick up on that. For example, Harry might start to analyze magical situations more thoroughly before acting, instead of just relying on his instincts.
Deadpool's irreverent personality would likely make Harry less uptight. Harry has always been under a lot of pressure, but Deadpool's carefree and often inappropriate humor could make Harry see the lighter side of things more often.
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.
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.
Asoka's culture is rich in values like non - violence and wisdom. In the fanfiction, Harry could be influenced by these values. For example, he might try to find non - violent solutions to problems in the wizarding world first, rather than immediately resorting to magic spells. His understanding of power and leadership could also be shaped by Asoka's example. He might become a more inclusive leader among his peers, rather than just being a hero figure. This would change the way he interacts with his friends, teachers, and even enemies in Hogwarts.
Kreacher is a very traditional character. His influence on Harry could mean that Harry is more into the old magic. He might be taught spells and incantations that are not commonly known in modern wizarding society. Also, Kreacher's loyalty to the Black family could make Harry more protective of the remaining members of the family and their heritage.
His magic could give him an advantage in intelligence - gathering. For example, he could use a spell like 'Alohomora' to open locked enemy files or doors without leaving a trace. Also, his ability to apparate (if he could find a way to do it secretly) would make him extremely mobile on the battlefield. But he would have to be very careful not to be caught using magic, as it could lead to chaos in the Muggle military world.
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.
Maybe Harry's magic gives his cousin a sense of security. If the cousin was always in some kind of danger, Harry could use magic to keep him safe. This would make the cousin less fearful and more adventurous. He could start to explore the world around him more, knowing that Harry has his back with magic. In addition, the cousin might develop an interest in magic himself, which could change his whole perspective on life.