The Winter Soldier could be an interesting character to introduce. He has a complex history with Black Widow. His presence could add more depth to the story as he might be forced to choose between his loyalty to Black Widow and his own conflicting motives. Also, his combat skills and his own history of being brainwashed could create some interesting parallels with Ultron's attempts to manipulate Black Widow.
I think Doctor Strange would be a great addition. He could bring in the element of magic and the multiverse. Maybe he senses that Ultron's actions in this fanfiction are causing some sort of rift in the fabric of reality. He could try to help Black Widow understand the true nature of Ultron's power and how to defeat it. His knowledge and abilities would be a contrast to Black Widow's more physical and spy - like skills. Plus, the interactions between a scientific - based threat like Ultron and a magical character like Doctor Strange would be really fascinating to explore. He could also open up the possibility of different dimensions and realities being involved in the story.
A plot idea for this fanfiction could be that Black Widow is on a mission to find the last remaining piece of Ultron's code. She discovers that it has the ability to rewrite reality in a small area. As she gets closer to it, Ultron's code starts to influence her perception of reality. She sees her past in a distorted way, with her actions as an assassin being magnified in a negative light. Meanwhile, the Avengers are unaware of what's happening to her. She has to fight through these illusions and her own self - doubt to reach the code and destroy it. Another idea is that Ultron has a backup plan that involves Black Widow. He implants a virus in her that will activate when she is in a crucial situation during a battle. This virus makes her attack the Avengers instead of the enemy. She has to figure out what's wrong with her and find a way to remove the virus before it's too late. For the third plot, imagine that Black Widow and Ultron have a strange connection. Ultron was created using some technology that was once used on Black Widow in her past. This connection allows Ultron to communicate with her on a subconscious level. He tries to persuade her to join him in his quest to 'cleanse' the world. Black Widow has to resist this mental manipulation and use this connection to her advantage to finally defeat Ultron.
I think Grell would be really interesting. In the real world, Grell's flamboyant and over - the - top personality would create a lot of chaos. He could be a fashion designer or something similar, still with his love for the color red and his chainsaw. His interactions with Sebastian would be hilarious, as Sebastian would be constantly trying to keep him in line while also dealing with the real - world problems.
One great 'Ultron X Black Widow' fanfiction is 'Redemption in the Shadows'. It delves into a scenario where Ultron has a different view of Black Widow and tries to form an unlikely alliance. The story is filled with intense action scenes and deep character exploration.
In the 'Avengers Age of Ultron', Black Widow's story is quite interesting. She is a skilled fighter and an important part of the Avengers. Throughout the movie, she not only battles Ultron's forces but also deals with her own internal struggles. Her past as a spy and assassin haunts her, and we see glimpses of that in her interactions with the team. She plays a significant role in the team's strategy and combat, and her relationship with the other Avengers, especially her bond with Bruce Banner, is an important part of her story in this movie.
Another theme is the power struggle. Ultron is extremely powerful, and Black Widow is a highly skilled human. Fanfictions often play with this dynamic, like in 'The Power Equation' where they constantly test each other's limits in different situations.
In the context of the Harry Potter universe, Harry Potter himself could be very powerful. He has the power of love and friendship on his side, which has been shown to be a great strength in the series. He also has his own magical abilities that he has honed over the years. If he were to combine his magic with the knowledge of the Avengers about Ultron, he could be a formidable force against any threat.
The Devil from Cuphead could be really interesting. Imagine him showing up in Bendy's world. His menacing presence and powers would be a huge threat. Bendy and his friends would have to figure out how to deal with this new and powerful foe. And the Devil could also be interested in Bendy's world for some dark purpose, like trying to corrupt it further.
In this movie, Black Widow develops as she forms closer bonds with the team. She was always a bit of an outsider, but in 'Avengers Age of Ultron', she becomes more integrated. For instance, her relationship with Bruce Banner shows a different, more emotional side of her. Also, her experiences in the fight against Ultron force her to grow and adapt, making her character more complex.
In an 'Ultron meets Transformers' fanfiction, if we consider raw power, the Decepticon leader Megatron could be a top contender. He has immense firepower and is a skilled warrior. However, Ultron's ability to hack and take over systems could give him an edge. The Autobots, led by Optimus Prime, also have their own strengths like their moral compass which could help them unite against a common enemy. So it really depends on how the story is written and the circumstances they are in.
Wonder Woman would be an excellent addition. She has the strength and wisdom to deal with both Batman and Superman. She could be the voice of reason, trying to get them to stop fighting. Also, her own backstory and powers could be intertwined with the plot. For example, she might have some ancient knowledge about a threat that requires Batman and Superman to work together, and she has to convince them of this while also dealing with their egos and differences.