A great plot idea is that Wanda Maximoff finds a hidden power within herself that is related to the Mind Stone but was never fully unlocked. As she tries to unlock it, she starts to have visions of an ancient civilization that had similar powers. She then has to convince the Avengers to help her find the remnants of this civilization. Along the way, they face many challenges, like dealing with other groups who also want to get their hands on this power. Wanda also has to deal with her own inner demons as she is afraid that this new power might be too much for her to control.
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.
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.
To develop Wanda's character more, we can focus on her relationships. For example, her bond with Vision could be explored deeper. Show how they grow closer and how they influence each other's view of the world. Also, her relationship with the other Avengers, especially those who were initially skeptical of her like Stark. Have her earn their trust through acts of self - sacrifice and kindness.
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 interesting storyline could be Wanda and Pietro exploring their powers further. They could discover new abilities and use them to protect their newfound friends in the Avengers. For example, Pietro could use his super - speed in creative ways during battles, like disarming enemies before they even realize what's happening. Wanda, on the other hand, could delve deeper into her mind - control powers and use it to turn the tide in difficult situations. Another storyline might involve their backstory before joining the Avengers. Maybe they encounter an old enemy from their past that forces them to confront their history and grow as characters.
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.
Steve Rogers could be an interesting pairing for Wanda. The contrast between his old - fashioned values and her more chaotic powers could create a lot of interesting storylines. They could learn from each other, with Steve teaching her about leadership and Wanda showing him the power of her unique abilities. Hawkeye could also be a good match. He has a family, and Wanda, who has lost so much, could find a sense of family and stability with him.
Another plot could involve Wanda accidentally getting trapped in one of Tony's experimental virtual realities. Tony has to enter the VR world himself to rescue her. Along the way, they learn more about each other's past traumas and form a deeper bond as they fight their way out.
One plot idea could be that the male OC is a new Avenger and he and Wanda start off as friends. They train together and gradually develop feelings as they face various threats side by side. Another could be that the male OC has a special power that can calm Wanda's chaos magic when it goes out of control. This creates a unique bond between them. Or perhaps the male OC is from a different dimension and he and Wanda meet during a multiverse - related event and have to navigate their relationship while also dealing with the chaos of different universes colliding.
One plot idea could be that Wanda and Shuri team up to create a new type of technology using Wanda's magic. They combine their skills to make a device that can detect threats from other dimensions. Another idea is that they get into an argument over how to handle a powerful artifact that has been discovered. Wanda believes it should be destroyed due to its unpredictable power, while Shuri wants to study it to unlock its secrets.