6) Silver Sable
As a mercenary and hunter of various war criminals, Silver Sable has clashed with various Marvel heroes in the past due to her fairly unforgiving methods and motives. In more recent years, however, she has been seen to be strongly allied with the likes of Spider-Man and Daredevil and has even once proved to be a romantic foil for the former.
As a citizen of the fictional state of Symkaria, she has a longstanding understanding with Dr. Doom, and was subjected to a harsh training regime by her Nazi-hunting father after the death of her mother. As a result, she dedicates herself to being subjective and ultimately emotionless, though sometimes this latter ideal is overcome in the heat of battle.
Silver Sable is by no means a simple character, however, and shares several parallels with the already-seen Black Widow. If nothing else, her future inclusion in the MCU could provide a little growth and focus for Natasha Romanoff, as she bonds with a kindred spirit in later plotlines.
Lord knows the Hawkeye stories aren’t doing it.
