The interaction of their powers would be fascinating. Harry's magic could be used to heal Spider - Man if he gets injured during a fight. Spider - Man's Spider - Sense could alert Harry of any oncoming danger, even magical threats that Harry might not be aware of immediately. Also, Harry could use spells to create distractions while Spider - Man uses his stealth to approach enemies unnoticed. This synergy between magic and superhuman abilities would create a very unique and exciting dynamic in the fanfiction.
Harry would probably be a bit of an outcast at first. The other students at Hogwarts might not understand his strange powers. Hermione would be curious and try to research if there was any magical explanation for it. Ron might be a bit jealous at first but then come around. And the teachers, like Dumbledore, would be very watchful. He would likely try to guide Harry in using his powers for good and not let them cause chaos in the wizarding world.
In a more cooperative scenario, Spider Man's web - shooting could be used in combination with Female Carnage's shape - shifting. For example, she could transform into a large structure and Spider Man could use his webs to anchor it or create a web - based mechanism around it. Their powers could also clash in a way that creates interesting visual and story - based effects, like when Spider Man's web gets caught in Female Carnage's symbiotic mass and she uses it against him.
Supergirl's super strength and invulnerability could provide a good defense for Spider - man. When they face really tough opponents, she could take the brunt of the attacks. Meanwhile, Spider - man's agility and ability to climb walls could help them access hard - to - reach places during their adventures. His spider - sense could also give them an early warning of danger that Supergirl might not detect right away with her normal senses.
Scarlet Witch's powers of chaos magic could potentially enhance Spider - Man's reflexes. Her ability to manipulate reality on a small scale might make Spider - Man's movements even more unpredictable to his enemies. For example, she could create a reality where Spider - Man's webs are stronger or his jumps are higher.
A possible way for a crossover to work is through a shared villain. Let's say a powerful dark wizard somehow gets hold of some Stark Industries tech and combines it with dark magic. This new threat catches the attention of both Spider - Man and Harry Potter. Spider - Man would bring his scientific knowledge and superhero skills, while Harry and his friends would contribute their knowledge of magic. They would have to learn to work together, with Spider - Man having to adapt to the strange rules of the wizarding world, like not being able to use his phone or other Muggle technology in Hogwarts.
Scarlet Witch could potentially enhance Spider - Man's physical abilities using her magic. She could make his strength even greater or his speed faster for a short period. In return, Spider - Man could protect Scarlet Witch from close - range physical threats. His ability to swing around the city quickly could also be useful in getting her to different locations where her magic is needed.
Spider Man would probably be very protective. He'd use his agility and strength to keep the kid out of danger. For instance, if they were in a fight scene, he'd quickly web - sling the kid to a safe place.
The characters could interact in a very interesting way. For instance, Hermione could be fascinated by Peter Parker's web - shooters and try to figure out the science behind them, using her vast knowledge. At the same time, Peter could be in awe of the magic Hermione can do. They could exchange ideas, with Hermione perhaps trying to find a magical equivalent to the web - shooters, and Peter helping her understand some basic principles of physics that might be related.
Well, for instance, Peter Parker (Spider - Man) could be invited to Hogwarts as a special guest lecturer on the concept of 'great responsibility' which he could relate to his own superhero experiences. He could show the students his web - shooters and how he uses them to protect the city. The Hogwarts students, especially the Gryffindors, would be very interested in his stories.
A possible plot could be that Harry's existence is a secret known only to a few. A group of evil forces, both from the wizarding world and the world of super - villains, learn about him and plan to capture him. Harry has to go on a journey to discover more about his origins and powers. He trains with both wizards and some of Spider - Man's allies. As he becomes more powerful, he finally faces off against the combined forces of evil to protect both his worlds.