Ares could be a great antagonist. He might see the union of Black Widow and Wonder Woman as a threat to his plans of chaos and war. His god - like powers would pose a significant challenge to the two heroines.
One common theme is female empowerment. Both Wonder Woman and Black Widow are strong female characters, and in fanfiction, they often team up to show the power of women working together. They break gender norms and prove that they can be just as capable, if not more, than male superheroes.
One idea could be that they are forced to team up against a common enemy who has the power to manipulate time. Black Widow's espionage skills and Wonder Woman's strength would make for an exciting combination in a race against time to stop the villain.
Friendship or a deeper bond is also a common theme. Since they come from different backgrounds (one from the DC universe and one from the Marvel universe in the original canons), fan fictions like to play with how they form a connection. They might start as strangers but end up as great friends or even more, like sisters in arms, supporting each other through various battles and difficulties.
For Wonder Woman, you could explore her adapting to a more modern world in the fanfiction. Maybe she has to deal with new technologies and social norms that are different from her homeland. For Black Widow, you could show her past traumas affecting her actions in new ways. For example, her experiences in the Red Room could resurface when she's in a high - pressure situation with Wonder Woman.
One popular 'Black Widow x Wonder Woman' fan fiction might be 'Alliance of the Two'. It focuses on their team - up in a world where they have to face a common, powerful enemy. The story showcases their different fighting styles and how they complement each other.
One idea could be that they team up to take on a common enemy who has the ability to manipulate minds. Wonder Woman uses her strength and lasso of truth, while Black Widow uses her espionage skills to outwit the enemy.
One great piece of Wonder Woman Black Widow fanfiction can be found on Archive of Our Own. It's titled 'Alliance of the Amazons and the Widow'. In this fic, they team up to fight a common enemy. The story does a great job of showing how their different skills complement each other.
A fanfiction idea could involve Wonder Woman visiting Wakanda. She is amazed by the advanced technology and the unique culture. Black Panther shows her around and they start to exchange ideas about leadership and protecting their respective peoples. Then an outside threat arrives, perhaps in the form of a group of villains who want to steal Wakanda's vibranium. Together, they fight off the invaders and in the process, Wonder Woman and Black Panther become good friends and allies.
They could form an alliance when their worlds are invaded by a common enemy from another dimension. Black Panther uses his tactical mind and Wakandan resources while Wonder Woman uses her combat skills. Result? A badass team - up against the invaders.