One way could be through a magical or scientific experiment gone wrong (or right, depending on how you look at it). Maybe a portal between their two worlds is opened and some kind of genetic or spiritual transfer occurs that makes Edward related to Tony. Another possibility is that an all - powerful being in the fanfiction universe decides to create this connection for some greater purpose, like uniting the magic of alchemy with advanced technology.
In fanfiction, anything can be possible. But in the original universes of 'Fullmetal Alchemist' and 'Iron Man', there is no such connection. However, in the creative world of fanfiction, an author might come up with an elaborate backstory to make Edward Elric be Tony Stark's son. Maybe it involves some kind of multiverse theory where different fictional worlds collide, and through some magical or scientific means, a relationship between them is established.
One possible plot could be Tony discovers his true parentage. He initially doesn't believe it but as he delves deeper into his past, he finds evidence that Loki is his father. This causes a huge rift between him and his adoptive father, Howard Stark. Meanwhile, Loki tries to use this new connection to manipulate Tony for his own ends.
Well, the plot might involve Harry being discovered by Tony Stark when he's a young boy. Stark, being the curious and intelligent man he is, tries to figure out Harry's strange powers. Along the way, they face villains who are interested in both Harry's magic and Stark's technology. As Harry grows, he has to learn to balance his two worlds, the magical world he came from and the high - tech world of his father. He might also use his knowledge of both magic and technology to save the day on multiple occasions.
One way it could be developed is through Tony Stark taking Peter under his wing early on. Maybe Peter's parents were somehow connected to Stark Industries. Tony could discover Peter's intelligence and potential, and start mentoring him like a father figure. This could lead to a strong bond between them, with Tony providing Peter with resources and guidance in both his personal life and his superhero activities.
Edward might meet his parents. Since he has the chance to go back in time, he could meet them when they were alive and perhaps learn more about alchemy from them, which could change his future actions.
Well, one possible plot could be that Naruto grows up in the Marvel universe with Tony Stark as his father. He might inherit some of Stark's technological genius along with his own ninja skills. Maybe he uses his chakra to power up some of Stark's suits in unique ways, creating a new kind of superhero hybrid.
Yes, there are likely fanfictions with such an out - of - the - box concept. Fanfiction often explores wild and creative ideas, and the idea of Tony Stark being Loki's son is a very imaginative one. Writers in the fanfiction community might come up with various scenarios to explain how this could be possible, like some magical or alternate - reality - based reasons.
There are probably fanfictions with the concept of Harry being Tony Stark's son. Many fanfic writers love to combine different fictional universes. For example, they might explore how Harry's magic would interact with Stark's technology in this scenario. It could lead to really interesting storylines, like Harry using magic to enhance Stark's inventions or vice versa.
Well, in fanfiction, anything can be possible. It could be that some sort of magical time - space rift or a powerful spell gone wrong brings Harry Potter into the world of Tony Stark. Maybe a wizard in the Potterverse messes up a spell and accidentally transports Harry to the Marvel universe where he is then adopted by Tony Stark.
One way this could be possible is through some sort of time - travel or alternate reality mix - up. Maybe in a universe where the normal rules of genetics and relationships are bent. For example, if there was a powerful magic or technology that rewrote the fabric of reality, it could make Tony Stark be Steve Rogers' son. It would completely change the dynamics of their relationship and how they interact with other Avengers.