Black Widow can be a key character. She is a skilled spy and fighter. In fanfiction, she could be the one to infiltrate Ultron's network to gather intelligence. Her relationship with Iron Man could also be explored further, like how they strategize together to take on Ultron and the challenges that come with their different personalities and approaches to problem - solving.
Pepper Potts often plays an important role. She might be involved in helping Iron Man deal with the Ultron situation, either by providing moral support or using her business acumen to handle the fallout of Ultron's attacks. For example, she could be the one to secure resources for Iron Man to build new defenses against Ultron.
Vision is also quite popular. Since he has a connection to Ultron, fanfictions might explore his role in a different light. Maybe he has some hidden abilities that he discovers while trying to stop Ultron. He could also be in a moral dilemma, being part Ultron but also siding with the Avengers, and this internal struggle could be a central part of the story.
In some fanfictions, there might be a storyline where Iron Man and Ultron merge their consciousnesses. This could happen due to a freak accident in a battle. As a result, they have to learn to co - exist and control the combined power. It creates a very unique situation where the genius of Iron Man and the raw power of Ultron are united, and they have to figure out how to use it for good while also dealing with the internal conflict of two very different minds in one body.
Ultron could be made more menacing by targeting Iron Man's loved ones. He could kidnap Pepper Potts or Rhodey and use them as bait or threats. This would make Iron Man more desperate and also show how cold - hearted and cruel Ultron can be. He could also spread false rumors about Iron Man, turning the public against him so that Iron Man not only has to fight Ultron but also deal with public hatred.
There are the villagers. They are the ones who are initially afraid of the Iron Man. They have to deal with his presence and the chaos he brings at first. For example, they worry about their metal supplies being eaten up by him.
There are often the farmers and the people in the village. They are the ones who first encounter the Iron Man and are affected by his presence.
In Iron Man 2 fanfiction, Tony Stark stands out as the most popular. His charm, intelligence, and superhero persona draw a lot of attention. Pepper Potts comes in second, as she is an important part of Tony's life, both personally and professionally. Writers love to explore their relationship dynamics. Additionally, Ivan Vanko, the villain in Iron Man 2, is also a popular character in fanfiction. His backstory and his vendetta against the Stark family make for interesting storylines.
Tony Stark is definitely one of the most popular. Since he is the main character in the movie and has such a complex personality, he offers a lot of room for fanfiction writers to explore different aspects of him. Pepper Potts is also popular as she is an important part of Tony's life.
Obviously, Spider - Man and Iron Man themselves are extremely popular. They are the main draws as they are the two iconic heroes. But characters like Pepper Potts might also be popular as she could be involved in stories related to Iron Man's actions in the fanfiction.
One idea could be Ultron taking over the armor of Iron Man and using it for his own evil purposes. He could then start attacking the city while people think it's Iron Man gone bad.
Spider - Man could use his agility. He could quickly dodge Ultron's attacks and find a weak spot in Ultron's armor. Since he's so fast and nimble, he could get in close and plant some sort of disabling device he made with his scientific knowledge.
In some fanfictions, Ultron might team up with one of Spider - Man's villains, like the Green Goblin. They could create a plan to take over New York. Spider - Man would then have to face this powerful alliance. He might seek help from other superheroes he's associated with, like Iron Man or Daredevil, to combat this new threat.