Sometimes, there could be other characters added in the fanfiction, like new villains that the Avengers and Jarvis have to face together. These villains can be original creations or lesser - known characters from the Marvel universe, which add new twists and turns to the story.
However, it might also be one of the Avengers. For instance, Iron Man could be important as he has the closest connection to Jarvis in the original lore. His relationship with Jarvis, both in the fanfiction and in the general Marvel universe, could drive the plot forward, especially if there are elements related to his father, Howard Stark.
Obviously, the two JARVISes are the main characters. They are the ones who will drive the story forward through their interactions.
One interesting scenario could be Jarvis helping the Avengers with a complex mission by providing real - time data analysis. For example, when they are facing an enemy with unknown powers, Jarvis quickly scans the situation and gives advice on how to counter the powers.
Well, obviously the Avengers like Iron Man, Captain America, Thor etc. would be main characters from the Avengers side. And from the Seven, whoever those characters are in that particular fictional context would be the main ones as well.
One interesting story could be that Edwin Jarvis uses his old - fashioned charm and knowledge to outwit a new enemy that the Avengers are facing. He might offer some insights based on his long experience with Howard Stark and the early days of S.H.I.E.L.D., which the Avengers find invaluable.
Obviously, Peter (presumably Peter Parker, Spider - Man) would be one of the main characters. And of course, the Avengers members like Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye are likely to be main characters too as they are the ones 'meeting' Peter.
Obviously, Rhodey and the Avengers members like Iron Man, Captain America, Thor, Hulk, etc. would be the main characters.
In addition to the obvious ones, sometimes other characters like Happy Hogan or Pepper Potts might also make an appearance. Happy could be the one who arranges some of Peter's meetings with the Avengers. Pepper might be involved in providing resources for Peter's new tech or helping Iron Man manage his relationship with Peter. But the core always remains Peter Parker and the Avengers.
Well, obviously Tony Stark is one of the main characters. Then there are the other Avengers like Captain America, Thor, Hulk, Black Widow, and Hawkeye. Sometimes characters like Pepper Potts, who is important in Tony's life, also make an appearance. Rhodey, Tony's friend, might also be included as he often plays a significant role in stories related to Tony.
The main characters could also be some villains. They might target Peter's sister to get to Spider - Man. So, villains like Vulture or Mysterio could be in the story, which would then force the Avengers to step up and protect her. In this case, the dynamic between the good guys (Avengers and Peter's sister) and the bad guys would be the central focus of the fanfiction.