One possible plotline could be Peter using the arc reactor to enhance his existing abilities. For example, if he has spider - powers, the arc reactor could make them stronger. Another could be Peter having to protect the arc reactor from villains who want to steal it for their own evil purposes.
Maybe he found it in an abandoned Stark Industries facility. It could have been left behind during some chaos and Peter, being the curious and resourceful guy he is, discovered it and decided to study it.
In this fanfiction, perhaps there's a big misunderstanding. Bucky has been led to believe that the arc reactor is some sort of key to a greater evil. So, without fully understanding its importance to Tony, he rips it out. This could then lead to a chain of events where Bucky has to face the consequences and try to make amends while Tony is fighting for his life.
The arc reactor in fanfiction about Tony Stark is a really cool concept. It can be used to show the evolution of Stark's character. At the start, it might be just a technological marvel for powering his suit. But as the story progresses in the fanfic, it could become something more spiritual or emotional for him. It might represent his connection to his past, his father perhaps, and his journey to become a better hero. And the way different authors play with this idea in their fanfictions is really fascinating.
The arc reactor in fanfiction involving Stephen Strange can also be a source of conflict. Some might write that the energy from the arc reactor is disrupting the magical balance that Strange is trying to maintain. This could lead to a tense relationship between the two characters at first, but as the story progresses, they could find a way to work together to either control or utilize the arc reactor's power in harmony with magic.
Firstly, research. Writers should do more research on the arc reactor's concept from the original works. This way, they can better understand its functions and limitations, and thus write more accurately about it in their fanfics.
Well, one common issue could be the misrepresentation of the arc reactor's power source. In some fanfics, it might be depicted as having an unlimited power supply without proper scientific explanation, which goes against the semi - realistic nature of the original concept.