In a fanfic scenario, Harry Potter's magic could be integrated in various ways. He could use the Summoning Charm to quickly retrieve weapons or supplies during combat. His magic could also be used to manipulate the environment. For example, he could make the terrain more difficult for the enemy to traverse by using magic to create obstacles. This would give the Marines an upper hand in battle situations. Also, his ability to read minds, if he were to develop it further, could be used for intelligence gathering within the Marines' operations.
Well, Harry could use magic to protect the Marines from harm. He could create a magical shield around their camps or during battles, much like the protective spells used in Hogwarts. Also, he could use magic to communicate over long distances without the need for technology, similar to the way wizards communicate with Patronus messages.
His magic could be integrated by using spells for combat. For example, 'Stupefy' could be used to incapacitate enemies quietly. And for reconnaissance, he could use 'Alohomora' to unlock doors and access areas without being detected.
His magic could be used for stealth. For instance, the invisibility cloak could be a great asset for MI6 agents on secret missions. They could move around unseen by the enemy.
The magic in Harry Potter could be seen as a different form of chakra. Spells could be chakra - based techniques. For instance, the levitation charm could be a chakra technique that Naruto or other ninjas learn. It could be used in combat or just for everyday tasks like moving heavy objects.
It could be that the character who is the Master of Death in the fanfic is seen as a prophesied figure in the Warcraft universe. Since the Master of Death has conquered death in the Harry Potter world, in Warcraft they might be seen as a being who can bring new life or restore balance. For example, they could use their power to heal the war - torn lands in Warcraft, much like how they might have used their power to protect or revive in the Harry Potter realm.
The magic system in Harry Potter could be integrated by having characters from Highschool DxD learn spells. For example, Issei could learn the Wingardium Leviosa spell to lift objects during battle, giving him an unexpected advantage. The Portkey concept could also be used to transport characters between the two worlds quickly.
One way to integrate it could be through time - travel. Suppose a wizard from the future where Gundam technology exists travels back to the Harry Potter era and brings with him the blueprints for the Black Magic Gundam. This causes a stir as different factions in the wizarding world either want to use it for their own gain or fear its power and want to prevent it from being built.
The magic in 'Harry Potter' could be used to deal with the werewolf problem in 'The Howling'. For instance, spells like the Patronus Charm could be used to fend off werewolves when they are in their dangerous state.
Magic could be used as a way to control or enhance the Quantum Leap process. For instance, a spell could be cast to ensure a more accurate leap or to protect the leaper from the potential dangers of leaping. The wands could be used as a sort of key or activator for the Quantum Leap device.
Raven could be integrated by having a common enemy. Let's say there's a powerful being that wants to conquer both the magical world of Harry Potter and the superhero - filled world of the Avengers. Raven, with her own set of powers that combine elements from both worlds, is the key to stopping this enemy. In the Harry Potter side, she could teach the students some new ways of combat magic that she learned from her experiences in the Avengers' world. And in the Avengers world, she could use her knowledge of Hogwarts' magic to create new defenses against threats that are related to magic.
The magic system can be integrated by having spells affect the Quantum Leap process. For example, a spell like 'Apparition' could be used to quickly move between different leaps or locations within a leap. Portkeys could also serve as a means to initiate a leap or to travel to a specific time - related destination during a leap.