As egos collide, Black Widow—street name, Natasha Romanova—is the only character who does not throw a monstrous hissyfit. The only character to gather actionable intelligence against Loki from Loki. The character who not only literally kicks sense back into the brainwashed Hawkeye, but then absolves him of any sins performed while under the loony god’s spell.
You want fearless? When midtown Manhattan is swarming with thousands of robo-aliens, the dreaded Chitauri, Black Widow commandeers one of their slippery aero-sleds and flies it to steal Loki’s glowing phallic scimitar so as to save the world so Iron Man can blow up the aliens.