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.
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.
It depends on the specific fanfiction. In some stories, Superior Iron Man might be more powerful because he's willing to push the limits of his technology and his morals further. But in others, Iron Man could be more powerful due to his experience and his ability to work well with others.
In a Spider - Man vs Ultron fanfiction battle, Spider - Man has a good chance of winning. He's extremely agile and has his spider - sense which can help him avoid Ultron's attacks. His web - slinging also gives him an edge in mobility.
One interesting plot twist could be that Ultron hacks into Spider - Man's suit. This would put Spider - Man at a huge disadvantage as Ultron could control his movements or disable some of the suit's functions.
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.
In some fanfictions, they might team up against a common enemy that requires both their unique skills. For example, a new super - villain who has the ability to hack into Iron Man's technology and also has super - strength that Spider - Man has to counter with his acrobatic fighting style. They would have to learn to work together, with Iron Man respecting Spider - Man's instincts and Spider - Man learning to trust Iron Man's strategic plans.
In some fanfictions, the winner isn't really about who is more powerful physically or technologically. It could be about who has the stronger will or the better moral compass. For example, if Iron Man realizes that he's in the wrong during the fight, he might back down, making Spider - Man the 'winner' in a sense. Or if Spider - Man is able to convince Iron Man of a greater good, the fight could end without a clear physical victor.
Thanos could also win in a fanfiction. He has incredible strength and the power of the Infinity Stones at his disposal. In a lot of fanfictions, the power levels are often exaggerated. Thanos could simply use the Reality Stone to make Iron Man's weapons ineffective or use the Time Stone to freeze Iron Man in time and then defeat him. His brute strength alone is enough to overpower Iron Man in a direct confrontation. And his experience in battles across the universe gives him an advantage over Iron Man who mainly operates on Earth.