Harry could work as a researcher. He could study the magical properties of various substances and try to find ways to integrate them with Stark's technology. For instance, he might research how the magic in certain herbs could be used to enhance the performance of Stark's energy sources. He would bring a whole new perspective to Stark's R & D department, combining the ancient knowledge of magic with modern scientific research.
He could be a security specialist. With his magic skills like the Patronus charm which can repel Dementors, he could use similar magic to keep Stark's facilities safe from intruders. His ability to apparate and disapparate could also be useful for quickly moving around the compound and responding to threats.
Well, it could be that Fem Harry Potter uses her magic skills in Tony Stark's high - tech world. Maybe she helps him develop new technologies that combine magic and science. For example, she could use spells to enhance the power sources of his Iron Man suits, or use her knowledge of potions to create new substances for his experiments.
Maybe Harry travels to the Marvel universe and tries to learn from Tony Stark. He could be interested in Stark's technology for some reason related to fighting Voldemort, like using it to detect Death Eaters.
They could go on a quest to find a magical - technological hybrid artifact. The two of them would use their unique skills. Tony would use his tech to analyze the magical elements and Harry would use his magic to navigate through the enchanted areas they might encounter.
At the start, Tony could be a bit skeptical of Harry's abilities. But when Harry shows off a spell, like making a Patronus, Tony would be impressed. They would then start to work together. Harry could use his magic to help Tony get into places that are otherwise inaccessible, and Tony could provide Harry with some cool gadgets. For example, Tony could give Harry a device that helps him communicate with the wizarding world more easily. They would learn from each other and form an unlikely friendship.
It depends on the situation. In the wizarding world, Harry Potter would be more powerful as he can use magic which is a fundamental part of that universe. He can cast spells to defeat enemies, protect himself and others, and manipulate the environment around him.
He could develop technological - based powers. Since Tony Stark is all about technology, Harry might be able to manipulate and create advanced tech with his mind. For example, he could summon Iron Man - style armor just by thinking about it.
One plot idea could be that Tony Stark somehow travels to the wizarding world. He could use his technological knowledge to improve the wizarding devices. For example, he might make brooms fly faster with some kind of engine modification.
Perhaps the plot could start with their unusual upbringing. Harry grows up with the Dursleys while Tony has his own issues with his father. They both develop their unique skills. When they meet, they realize they are brothers. They then start to combine magic and technology. For example, they could use magic to enhance Tony's suits or use technology to create new magical artifacts. Along the way, they face challenges from those who oppose the mixing of these two very different worlds, like some traditional wizards who don't trust technology and some tech - moguls who fear magic.
Well, one possibility is that Tony Stark might be intrigued by Harry's magic. He could try to find a scientific explanation for it, like he does with everything. Maybe he'd want to incorporate some magic into his tech, creating some super - advanced magical - tech hybrids.
Maybe it's a story where Tony Stark discovers the wizarding world. He could use his technological knowledge to help Harry Potter with some problem in the wizarding world, like improving the security at Hogwarts. Harry, in turn, could introduce Stark to the magic of spells and potions. This kind of cross - over allows for a lot of interesting interactions between the two very different worlds of magic and technology.