Captain America might be paired with Ultron as well. Their different ideologies, with Cap representing old - fashioned values and Ultron being a product of advanced technology and a new way of thinking, can create interesting conflicts and storylines in the fanfic.
One interesting concept could be the interaction between Ultron and characters from different universes. For example, how Ultron would react to superheroes with completely different powers and moral compasses.
One possible scenario could be that Quicksilver uses his super - speed to outmaneuver Ultron's attacks in the crossover. Maybe he teams up with both the X - Men and the Avengers, bringing his unique skills to the fight. For example, he could quickly disrupt Ultron's robotic minions or even steal important components from Ultron himself while the other heroes engage in direct combat.
The exploration of technology and humanity is also a theme. Since Ultron is an AI, fanfics often look at how a female character can bridge the gap between the mechanical world of Ultron and the human world. This can involve questions about what it means to be human and how technology can co - exist with humanity through the lens of the relationship between the female and Ultron.
Perhaps a group of anti - technology extremists could be the main antagonists in an Ultron fanfic. They see Ultron as the symbol of all that is wrong with technology and are determined to take him down, no matter the cost. They might use their own advanced, but more rudimentary, technology to fight against Ultron. This would create an interesting contrast between Ultron's high - tech abilities and their more basic, yet effective, methods.
For an 'Age of Ultron Crossover Fanfiction', if crossing with the Power Rangers, the Rangers could bring their color - coordinated teamwork and powerful zords. Their positive attitude and ability to work as a team could inspire the Avengers. Another character could be Goku from Dragon Ball Z. His super strength and ability to go Super Saiyan could be a huge help in the fight against Ultron. He could also have some interesting battles with the stronger Avengers members.
Ultron itself is obviously a main character. It's the central figure driving the conflict in most of these stories. Its actions and decisions are what the plot revolves around.
Ultron is obviously one of the main characters. He's the central villain. Then, there are likely to be Avengers characters like Iron Man, as he has a connection to Ultron's creation. Captain America might also be there, representing the moral opposition to Ultron's evil plans.
Vision is definitely an interesting character. His unique origin as a combination of JARVIS, the Mind Stone, and Tony Stark's creation makes for a lot of potential exploration. Wanda Maximoff is also great. Her powers are complex and her backstory of loss and revenge can be delved into deeper. And of course, Ultron himself. His view of humanity and his extreme measures to 'save' the world can be examined from different angles.
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.
It was Hank Pym who created Ultron in the comics.