There could be. Since fanfiction writers love to create unique and unexpected crossovers, the idea of Harry Potter being the brother of Tony Stark is an interesting concept that might have been explored. However, it's not a very common or mainstream crossover, so it might take some digging to find. You could also check some specialized fanfiction communities or forums where people might discuss or share such works.
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.
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.
It would be a very unique blend. Maybe Harry would use some of Tony's technology in the wizarding world. For example, he could use Stark - made gadgets to enhance his magic or to fight against dark wizards in a more modern way. And Tony, on the other hand, might be introduced to the magical world through Harry and be fascinated by spells and potions.
In fanfiction that combines Harry Potter and Tony Stark, 'petal' could potentially be used in a variety of ways. It might be part of a magical plant in the Harry Potter aspect, like a petal from a rare flower used in a potion. In relation to Tony Stark, perhaps it could be part of a new technology he's developing that has an aesthetic inspired by a petal's shape. However, without more context, it's hard to be certain exactly how it would be incorporated.
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.
In this fanfic, Tony Stark would interact with Harry Potter in a very interesting way. At first, he might be a bit overbearing, trying to control every aspect of Harry's life because he wants to keep him safe. But as he gets to know Harry better, he'd start to respect Harry's independence. Tony would also be fascinated by Harry's magical abilities. He might try to find a scientific explanation for it, and in the process, he and Harry would have many deep conversations. Harry would learn from Tony's confidence and self - assurance, while Tony would learn about the power of magic and the importance of things that can't be measured by science.
Yes, there are quite a few fanfictions out there that combine the worlds of Tony Stark from the Marvel universe and Harry Potter. Writers like to explore crossovers where the genius of Tony Stark might interact with the magic of Harry Potter's world. It can be really interesting to see how his technology would mesh with magic spells and wizardry.
Another aspect could be the family dynamic. Since Tony is known for his brash and confident personality, he might be overprotective of Harry as his nephew. Harry, on the other hand, is used to dealing with the wizarding world's challenges on his own. This could lead to some interesting conflicts and growth for both characters. For instance, Tony might try to keep Harry away from Hogwarts, thinking it's too dangerous, but Harry would be determined to go and learn magic.
There is definitely some great tony stark and harry potter fanfiction out there. One interesting aspect in some of these fics is how the characters' personalities interact. For example, Tony's quick - wittedness and Harry's sense of justice can lead to some really engaging dialogues. You might want to check out Archive of Our Own as well for such fics.