The son might have a very close relationship with his father's friends. For instance, if Edward has a best friend, the son could look up to that person as an uncle - like figure. They could go on adventures together and the friend could teach the son things that Edward might not be able to.
In some fanfictions, they might be portrayed as Edward's sons for the sake of creating unique family dynamics or exploring different storylines. However, this is not part of the original canon.
Yes, there are some interesting 'Edward is Roy's son' fanfictions out there. You can often find them on popular fanfiction websites. Some focus on exploring their relationship in a heart - warming family - like way, showing how Roy would be as a father figure to Edward and the growth of their bond.
One great Carlisle and Edward father - son fanfiction is 'The Bond Beyond Blood'. It delves deep into their relationship, showing how Carlisle's guidance has shaped Edward over the years. It has some really touching moments where they communicate on a deeper level about their vampire existence and the moral code they follow.
One possible storyline could be that Edward's son has some sort of special ability. Maybe he can communicate with animals like his father, but in a different way. For example, he can understand the thoughts of mythical creatures. This would lead to all sorts of adventures as he tries to keep these creatures' secrets while also learning more about his own powers.
One common theme is family bonding. It shows how they develop a father - son relationship. Another is the passing on of knowledge, like Roy teaching Edward about alchemy and military strategies.
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.
Maybe they would name their son after a family member. For example, if Edward had a great - grandfather he admired, they might name their son after him. It could be a name that has significance in the Cullen family history, like Carlisle was an important figure, so they could name him Carlisle Jr.
One common theme is identity. Harry has to figure out who he is now that he's Edward's son. Another is family acceptance. They both need to accept each other as family. Also, there can be themes of power inheritance if Edward has some special powers.
The theme of legacy also pops up often. Carlisle has certain values and a way of life that he hopes Edward will carry on. Fanfictions explore how Edward either embraces or struggles with this legacy. For instance, Carlisle's peaceful co - existence with humans is a legacy that Edward has to decide whether to uphold or not in different storylines.