Natasha Romanoff is the little black dress of The Avengers fandom. Maybe it is just her inherent awesomeness, but I can imagine her with everyone from Clint to Steve to Maria. The Black Widow has close ties to every member of the team (except maybe Thor, but he's all wrapped up in Loki…err, I mean Jane), but could she ever be with the one man who truly frightens her, Bruce Banner, AKA The Hulk? The Avengers: Age of Ultron trailers suggest a special bond may be brewing between Bruce and Natasha, and you know what? It makes sense.
Stay with me now. Natasha has a dark past of her own. As she famously said in the first Avengers, “I've got a lot of red in my ledger; I'd like to wipe it out.” Comic book fans know Natasha was subjected to brainwashing in the Red Room as a child, and as a result she became a killer. Unlike the squeaky clean Steve or god of thunder Thor, Natasha's past is dark, and complicated by acts she had no control over.