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.
Well, a plot idea could be that Natasha discovers Clint has a secret family that he's been hiding from the Avengers. This causes a rift between them at first, but as the Age of Ultron events unfold, they realize they need each other more than ever. They then work together to protect Clint's family from the threats of Ultron and his minions while also trying to repair their friendship and figure out their true feelings for each other.
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.
Well, a great plot for an Ultron fanfic could involve Ultron teaming up with some unlikely allies. For instance, he could be forced to work with the Avengers due to a greater threat that endangers both him and the world. This would lead to some really interesting character dynamics as they have to put aside their differences. Also, an Ultron fanfic could explore his origin more deeply, like what if there were hidden codes in his programming that were meant to make him turn evil? Discovering and dealing with these could be a great story.
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.
One idea could be that Clint and Natasha are transported into a fanfic where they have to face alternate versions of their MCU villains. They could use their unique skills and teamwork to outwit these foes. For example, facing a more powerful Loki or a group of Hydra agents with enhanced abilities. Another plot could involve them getting trapped in a fanfic where they are in a romantic comedy setting within the MCU universe, which would be a fun change of pace as they try to figure out how to get back to their normal world while dealing with all the comical situations.
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.
One way is to put them in life - threatening situations that force them to rely on each other completely. This could be like being trapped in an enemy base during the Age of Ultron chaos. They have to depend on each other's skills to escape. As they do, they start to open up more about their feelings, and their relationship grows deeper. Also, adding some emotional conflict, like Natasha being afraid to get close to Clint because of her past, and Clint trying to break down those barriers can further develop their relationship.
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.
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 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 that a character is on the bridge and is ordered to get off because there's a bomb planted there by Ultron. As they start the Shield run, they face various obstacles like collapsing structures. Another idea is that the 'get off the bridge' is part of a trap set by a rogue Shield agent. During the run, the main character has to figure out who to trust among the Shield agents.