A plot idea could involve Darcy getting kidnapped and Black Widow having to rescue her. Along the way, they discover a deeper connection between them, perhaps related to some hidden aspect of Darcy's past that ties into Black Widow's own history in the spy world. This could lead to a strong friendship or more in the fanfiction.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There's a large community there that writes various fanfics, and you can search specifically for Darcy Lewis and Black Widow. Another option is Fanfiction.net, although AO3 generally has a more organized tagging system for easier discovery.
Definitely not ethical. Fanfiction is a form of creative writing within the fan community, but when it comes to writing about abuse of a character, it crosses a line. Darcy Lewis represents certain qualities in the original work, and subjecting her to abuse in fanfiction goes against the spirit of the character and can have a negative impact on the fan community as a whole. It may also violate the unwritten rules of respect and positive contribution within the fanfiction world.
In many fanfictions, Darcy is shown as someone who can hold her own among the superheroes. She isn't intimidated by their powers and status. Instead, she uses her intelligence and charm to interact with them. For example, she might be the one to come up with a clever plan to outwit a villain when the Avengers are at a loss. Her presence also adds a touch of normalcy to the otherwise super - powered world of the Avengers.
Another theme is self - discovery. Darcy in some fanfictions is on a journey to find out more about herself, her capabilities, and her place in the world she's in. For example, she might realize she has leadership skills she never knew about before.
Another aspect is that they could be allies in various adventures within fanfiction. Darcy's scientific knowledge and Thor's physical strength would make them a formidable team. They might face off against villains or solve mysteries together, with their friendship or relationship growing stronger through these shared experiences.
Another theme is the support she gets from others. Her friends or colleagues often come to her aid, highlighting the importance of relationships in difficult times. In many of these fanfictions, the bond between Darcy and the other characters deepens because of her injury.
In fanfiction, Darcy Lewis can have various relationships with the Avengers. Sometimes she's a key figure in providing comic relief. For example, her quick wit and sarcasm can lighten the mood during intense Avengers situations. She might also be involved in scientific research that aids the Avengers in their missions, like helping Tony Stark with some new tech based on her own unique scientific knowledge.
One great 'Darcy Lewis Time Travel Fanfiction' is 'Darcy's Time - Hopping Adventures'. It has an exciting plot where Darcy jumps through different time periods in the Marvel universe, encountering various characters in unexpected ways.