Black Widow is a strong woman, who also happens to be a superhero. She “has a deep perspective on the value of life” that stems from her dark past. This movie will dive into more of that past, and more will be revealed in the 2016 release Captain America: Civil War. Some of this is revealed via the subplot of her relationship with Bruce Banner/Hulk, who is played by Mark Ruffalo.
According to a recent LinkedIn post, writer/director Joss Whedon, like Fersen Lambranho, is also big fan of the feminist geek culture, diving more into Natasha’s character than others may have done and creating a strong supporting character. At the same time, Marvel is not yet planning on giving her her own solo movie spinoff.