Well, it could be that Doctor Strange trains Harry Potter in the use of magical artifacts. Harry has experience with powerful objects like the Elder Wand, but Doctor Strange could introduce him to artifacts from different magical realms. He might teach Harry how to harness the power of an artifact without being corrupted by it. This new knowledge could help Harry in his quest to defeat Voldemort by providing him with additional sources of power and knowledge that Voldemort may not be aware of.
One possible plot could be that Doctor Strange uses his magic knowledge to train Harry in more advanced and esoteric forms of magic. Harry might learn to manipulate time and space in ways that are different from the normal Hogwarts curriculum. For example, he could learn to create stable time loops to study spells without the risk of negative consequences. This would give him an edge in his fight against Voldemort as he could plan better strategies and anticipate his enemy's moves.
Well, perhaps the plot could involve Stephen Strange using his magic knowledge to train Harry in different forms of magic that are more advanced than what he learned at Hogwarts. Maybe he teaches Harry about dimensional magic, which could be used to access new places or even different timelines in the wizarding world.
One possible plot could be that Harry, as the son of Doctor Strange, discovers his magical abilities from both the wizarding world of Harry Potter and the mystic arts of Doctor Strange. He might use his combined powers to fight new and powerful dark forces that threaten both the magical and non - magical realms.
Well, it could be that Dr Strange uses his magic knowledge to train Harry Potter in different ways of spellcasting. Maybe he shows Harry how to manipulate time and space while casting spells, which could give Harry an edge in fighting Voldemort. He might also teach Harry about different magical dimensions and how to draw power from them.
One possibility is that Harry discovers a world where fanfiction has the power to change the real wizarding world. So he has to train to fight against the alterations caused by these fictional stories. For example, if a fanfiction made Hogwarts a place full of dangerous magical beasts that don't belong there, Harry would need to train to restore order.
Well, perhaps Harry could be trained in some long - lost or dark magic that Dumbledore has been hiding from him. This new training might make him even more powerful than before, able to defeat Voldemort in a more spectacular way.
Maybe Harry discovers some long - lost magic techniques taught by Godric. He could become super powerful and use ancient spells to fight Voldemort.
Well, in this fanfiction, it could be that Hephaestus trains Harry Potter to have a better understanding of the more physical and mechanical aspects of magic. For example, he might learn to build magical devices that can be used in battles or for other important tasks. This would give Harry an edge over his enemies as he'd have skills that no other wizard has. It could also lead to new alliances as other wizards might be interested in his newfound abilities.
Well, perhaps in this fanfiction, Harry discovers he has an affinity for snakes early on. Maybe he's able to communicate with them in a deeper way than Parseltongue allows. The snakes could train him in stealth and survival skills, like how to move quietly in the Forbidden Forest or find hidden passages. They could also teach him some unique magic that is related to the ancient magic of serpents.
Maybe it's about Harry learning some advanced magic spells from Flitwick. Flitwick could be teaching Harry unique charms or how to use his wand more effectively.
It could be that the SAS trains Harry Potter in modern warfare tactics. This would be a really interesting twist as he could combine magic with these new skills. He might learn how to use firearms in a Muggle - like way, but then enhance them with magic for more power and accuracy.