For 'Age of Ultron Crossover Fanfiction', a crossover with the DC universe would be epic. Superman and the Avengers could join forces to take on a greater threat that combines the villains from both universes. Or, a crossover with the Transformers. The Avengers could work together with the Autobots to stop Ultron from getting his hands on the powerful technology of the Transformers. This would lead to some amazing battles and team - up moments.
One idea could be an Ultron crossover with the Avengers in an alternate universe where Ultron teams up with a younger version of Tony Stark to fix his mistakes. They could use their combined intelligence to create a new form of technology that benefits all of humanity.
One idea could be exploring how Ultron's advanced technology interfaces with Sigma's unique abilities. Maybe Ultron tries to assimilate Sigma's powers for his own evil plans.
Well, a fanfiction might explore Spider - Man's relationships within the Avengers during Age of Ultron. He's the new guy, so there could be some tension or bonding moments. For instance, he could have a heart - to - heart with Captain America about what it means to be a hero. Or he could have a friendly rivalry with Thor, competing to see who can take out more Ultron bots in a given time.
One idea could be exploring the backstories of the new characters introduced in the movie in more depth. For example, Wanda and Pietro Maximoff. Maybe write about their lives before they got their powers.
A great plot idea is Wanda having to face off against a new villain who is specifically targeting her because of her powers. This villain could be trying to manipulate her powers for their own evil purposes. Also, a plot where Wanda teams up with other female superheroes from the MCU to form a sort of sisterhood and take on threats that are being ignored by the male - dominated superhero groups. It would show her growth and ability to form new alliances.
Well, a cool plot might be that Wanda accidentally creates a rift in time while trying to master her powers. She then has to team up with a younger version of herself to close the rift before it causes chaos across the multiverse. Or perhaps she forms an unlikely alliance with a villain from the Age of Ultron who has a change of heart. They then work together to stop a new, more powerful enemy that is emerging. Also, a story where she uses her powers to enter the minds of the Avengers and discovers their deepest fears and insecurities, which she then uses to strengthen their bond.
One idea could be exploring Clint and Natasha's past missions more in - depth. Maybe there were some unspoken feelings that emerged during a particularly dangerous mission before the events of Age of Ultron. Another could be a fanfic where they get separated during the chaos in Age of Ultron and their journey to find each other again, facing new enemies and challenges along the way.
One idea could be exploring the backstory of a minor character in the movie. For example, what if one of the Sokovian citizens had a special power that was awakened during the chaos of the battle. Another could be a different take on the relationship between Vision and Wanda. Maybe Vision struggles more with his new - found emotions and Wanda has to help him understand humanity better. Also, a fanfic could focus on what would happen if Ultron had a change of heart midway through his plan due to some unforeseen event or encounter.
One plot idea could be Natasha and Steve having to go undercover together during a mission related to Ultron's early schemes. They could pretend to be a couple, which would lead to some awkward yet heartwarming moments as they navigate their feelings while also trying to stop Ultron. Another idea is that Natasha discovers a hidden past of Steve that is somehow connected to the creation of Ultron and they have to deal with the revelations together.
One idea could be a crossover with 'The Lion King'. The Ice Age characters could end up in the Pride Lands. Sid might make friends with Timon and Pumbaa, while Manny and Diego have to deal with the lions. Another could be a crossover with 'Finding Nemo'. The Ice Age gang could somehow find themselves in the ocean, trying to help Marlin find Nemo. It would be a really wacky and fun adventure.