"For all the people who seem really excited about Riri Williams, who's going to take on the role of Iron Man, there were letters over the course of the week, which all said, 'I am a long-time reader, I'm 50-something years old, why are you destroying all the characters that I love? I can't find a character that looks like me anymore,'" says Tom Brevoort, Marvel's senior VP of publishing on the company's efforts to appeal to an underrepresented audience.