One way it could happen is through magic. Harry Potter is well-versed in powerful magic. He could use spells like 'Episkey' or more complex healing magic to mend Pietro's injuries. Maybe he'd have to study some new spells specific to Pietro's unique speedster physiology.
Another possibility is that Harry Potter's connection to the magical world gives him access to knowledge or powers that can cross over to the non - magical realm where Pietro exists. He might be able to draw on some deep - seated magic within himself, like the power of love which has been shown to be very strong in the Harry Potter series, and use it to heal Pietro.
One possibility is through magic. Harry Potter is known for his powerful magic skills. He could use spells like 'Episkey' or more advanced healing magic. Maybe he stumbles upon Thranduil who is injured in some enchanted forest. Harry, being the kind - hearted hero, decides to use his magic to heal the elven king.
Pietro's super speed could enhance Harry's ability to quickly move around Hogwarts during a battle or while searching for something. For instance, if Harry needs to reach the Room of Requirement in a hurry, Pietro can carry him there in an instant.
Well, perhaps there is a dark force that is after Maximoff and it's affecting different universes. Harry Potter, being the hero he is, senses this disturbance in the magical fabric. He travels to Maximoff's realm using his Patronus as a guide. Once there, he uses his knowledge of defensive magic, like the Shield Charm and Stunning Spells, to protect Maximoff and save him from the impending doom.
One way it could happen is through the power of the Time - Turner. Harry could use it to go back in time and prevent the event that injured Tony Stark in the first place. Or he could take Tony to Hogwarts where the advanced magic and potions could be used to heal him. The magic potions like the Felix Felicis could be given to Tony to enhance his chances of a speedy recovery, and the healing spells of Madam Pomfrey could also be very effective.
One idea could be a crossover where Pietro uses his super speed to deliver important Hogwarts letters that the owls can't manage in time. Another could be that Pietro accidentally enters the wizarding world and has to learn magic while Harry helps him adapt. Maybe Pietro's sister Wanda also gets involved and her magic interacts in strange ways with the Hogwarts spells.
Pietro Maximoff's death in the comics is quite complex. It often involves various storylines and conflicts with powerful foes.
One idea could be a story where Clint Barton and Pietro Maximoff are forced to team up during a mission. They start off not getting along because of their different personalities and fighting styles. Clint is more of a traditional, precise marksman, while Pietro is impulsive and super - fast. But as the mission progresses, they begin to understand and respect each other, and by the end, they form a strong friendship.
House - elves might also be involved. They are known for their ability to perform magic related to the home and care. They could help Harry Potter prepare a proper environment for the healing. For example, they could keep the area clean and free of distractions while Harry focuses on Pietro's healing.
Yes, Pietro Maximoff does die in some comic storylines.
There's also 'Pietro and the Mysterious OC'. In this one, the OC has a special power that initially puzzles Pietro. As the story unfolds, their connection becomes deeper and more complex. It's full of action scenes and emotional moments between the two characters.