In this fanfiction, Draco would flaunt his family's signature spells. His magic would be more calculated and strategic, like setting up magical traps before the duel even starts. Harry's magical abilities would be more about his connection to his friends and the positive energy that gives him. He could use magic that is enhanced by his loyalty and friendship, like a spell that gets stronger the more he thinks about protecting those he cares about. During the duel, both of them would have to constantly adapt their magical abilities to counter each other's moves.
Well, perhaps Draco has some new-found knowledge or a secret weapon that gives him confidence to take on Harry for the Lord Black title. Harry, on the other hand, may be initially reluctant to engage in the duel but is pushed into it to protect the legacy of the Black family. During the duel, they both could discover things about the Black family history that changes their perspective on the whole matter.
If Harry is Salazar, he might have enhanced Parseltongue abilities. Salazar was known for his connection with snakes, so Harry could communicate with a wider variety of serpents and perhaps even gain more control over them. For Draco as Godric, he could have a stronger affinity for Gryffindor - like magic, such as a more powerful Patronus, perhaps in the form of a lion, representing Godric's courage.
His magical abilities would likely be developed in a more archaic and powerful way. The founders had different areas of expertise, so Harry could inherit a wide range of skills. Maybe he'd be a master of defensive magic like Salazar Slytherin was known for some aspects of it, and also be proficient in charms like Helga Hufflepuff was with her kind magic.
Well, Morgana has a deep understanding of magic that is far more ancient than what is taught at Hogwarts. When she and Harry interact magically, her knowledge could enhance Harry's abilities. Maybe she could show him how to use magic without a wand, which is something she might be proficient in. In return, Harry's unique connection to the magic of love (as seen with his mother's protection) could have an impact on Morgana's magic. It could start to soften some of the darker aspects of her powers.
Harry's Patronus charm could be a very interesting element when it comes to interacting with Davy Jones. Since the Patronus is a positive and powerful form of magic, it could have an effect on the dark and cursed nature of Davy Jones and his crew. Maybe it could temporarily stun them or even start to break the curse on the crew. And Davy Jones' power over the kraken could be used against the wizarding world, but wizards could use their magic to either tame the kraken or create barriers to keep it at bay.
In many fanfictions, when Draco finds out Harry is Lord Black, it often leads to a shift in their dynamic. It could make Draco more envious or it might force him to re - evaluate his views of Harry. For example, in some stories, Draco realizes that Harry has more power and influence in the wizarding world than he initially thought, which makes him both jealous and a bit intimidated.
Since Harry has a lot of experience with defensive magic, and the female elf might have her own unique elven magic. When they are together, their magic could work in synergy. For instance, in a battle, the elf could use her nature - based magic to create barriers made of vines and trees, and Harry could then strengthen those barriers with his defensive spells. Their combined abilities could also be used in a more domestic setting, like using their magic to create a beautiful and enchanted home that combines wizarding comforts and elven natural elements.
If raised by Newt, Harry's ability to sense the emotions and needs of magical creatures would be enhanced. This is because Newt has a great understanding of these aspects. Harry might also develop unique magical abilities that are specific to interacting with the habitats of magical beasts, like being able to create or modify suitable environments for them with magic.
Well, Doctor Strange's magic is more about manipulating energy and dimensions. His spells are based on gestures and incantations from the Marvel universe. Harry Potter's magic is more about using wands and specific spells like 'Expelliarmus' or 'Lumos'. If they were to interact, Doctor Strange might be able to enhance the power of Harry's spells by adding his own energy manipulation. For example, if Harry were to cast a shield charm, Doctor Strange could use his magic to make it stronger and cover a larger area.
Morgana's magic was often associated with nature and the elements in the old legends. Harry, having grown up in a more structured magical world, might find her ability to manipulate the elements in a raw way quite fascinating. Their combined magic could potentially create something entirely new. For example, if they were facing a powerful dark wizard, Morgana could call upon the power of the wind and rain to weaken the wizard's defenses, while Harry could use his Patronus charm to attack the wizard directly. Their magical abilities could complement each other in a fight, with Harry providing the precision and Morgana the brute force.