Stan Lee was more humble than the public might believe, according to Marvel Studios president Kevin Feige, but he did encourage Marvel executives to follow his lead. One way in which that directive will continue for the comic book media company after Lee's death this week: more diversity in character and storytelling. "People would talk about the importance of the movie [Black Panther] and what a brave thing it was for Walt Disney Studios to spend this kind of money on an almost entirely African-American cast — which is entirely true," Feige recently told Variety. "But look at what Stan Lee and Jack Kirby did in the 1960s, creating that character in the center of the Civil Rights movement."

Stan Lee, founder of Marvel Entertainment Inc., poses for a photograph with a life size model of his superhero Spider-Man while in his office in Beverly Hills, California, U.S., on Thursday, Dec. 18, 2008. Jonathan Alcorn | Bloomberg | Getty Images

Feige recently said the comic book movie studio's films are better when they are more diverse, and the box office returns from "Black Panther" — as well as from DC Entertainment's "Wonder Woman" — back that up, not just in terms of audience approval, but measured in huge box office grosses. "Black Panther" grossed over $1.3 billion, according to Box Office Mojo; "Wonder Woman" grossed over $800 million worldwide. Marvel's next slated film, "Captain Marvel," will feature "the most powerful" superhero in the Marvel Cinematic Universe, according to Feige.

Avengers is coming to an end

Marvel's most-profitable superhero blockbuster franchise is still Avengers, and it will reach its conclusion this summer and after that is expected to be shelved, at least for some time, by Disney and Marvel Studios, leaving some big decisions to be made about the next stage in Marvel's brand identity. The Avenger films have grossed a combined total of over $4.9 billion worldwide for Disney and Marvel, according to Box Office Mojo, representing about 28 percent of the Marvel Cinematic Universe's global box office success. Overall, the Marvel Cinematic Universe of characters is still majority white, but Marvel Studios has been expanding its representation. "If you're in a position of power and you're the one doing the hiring, we have learned — on our last number of movies and a number of movies that haven't come out or haven't been announced — that the more diverse the group of people around the table, the better the movie," Feige recently said. Actor Frank Grillo, who has appeared in Captain America and Avengers films, suggested that the next Captain America can be a different race or gender. "I don't know, but there have been rumors that Captain America could be African American. It could be a woman. You know? So they're looking," said Grillo, who played the Captain America villain Crossbones in 2016's "Captain America: Civil War" on Larry King Live. There has been some speculation that Anthony Mackie, who plays Falcon, could eventually become the new Captain America after "Avengers 4", which would pick up a story line that was tried out in the comic book form, according to Screen Rant.

New featured characters in films are rare

But there are risks associated with changing the race and identity of iconic characters, according to Brian Schutzer, owner of Sparkle City Comics. "People don't want Captain America to be anyone but Steve Rogers. They don't want Thanos to be anyone but Thanos," said Schutzer. "Just like Falcon (Anthony Mackie). In the comics, when Falcon became Captain America sales plummeted after the initial issue. So there is the evidence that it would not benefit Marvel." It has proven difficult for Marvel to establish new characters and turn them into valuable film franchises. "Deadpool and Venom are the only two Marvel characters created in the last 40 years to have been featured in a Marvel movie. That should illustrate how hard it is to create a character," Schutzer said. Feige said last summer that more characters from the LGBT community are on the way. "Both ones you've seen and ones you haven't seen," Feige told The Playlist, according to ScreenRant. "Thor: Ragnarok" actress Tessa Thompson confirmed on Twitter last year that her character Valkyrie is bisexual. "Thor: Ragnarok" grossed over $850 million, but a scene that confirmed Valkyrie's sexuality was cut from the film.

Actress Tessa Thompson at the world premiere of Marvel Studios' 'Thor: Ragnarok' at the El Capitan Theatre on October 10, 2017 in Hollywood, California. Rich Polk | Getty Images Entertainment | Getty Images

"Most fans are absolutely onboard with the idea of more representation among Marvel's leading characters, and I think the studio is of the same mind," said Shawn Robbins, chief box office analyst for boxoffice.com. Karie Bible, box office analyst for Exhibitor Relations, said diversity remains a problem and the words are still coming faster than the deeds to back them up. "I would love to see an LGBT character in a Marvel film. Representation matters and Kevin Feige has said that it will happen. That said, studios are still reluctant to do it, as they don't want to risk alienating audiences or get shut out of key foreign markets like China or Russia," Bible said. "These films are costly to make, market and distribute, so they have to deliver. I hope someday in the future that films will be so diverse and inclusive that it will no longer be an issue. Unfortunately we aren't there yet." Marvel Studios and Disney declined to comment. Schutzer noted that Marvel already has successfully established LGBTQ characters in comic books, but not films, and often through supporting characters rather than leads. "They have introduced LGBTQ characters, popular ones too like Angela, formerly of Spawn and Ms America. Angela is a fun character who was dating a 'being' who can switch between male female and other. It was entertaining, but like most characters in comics, not everyone is a star," he said. But Schutzer added that creating new characters in comic books and seeing which catch on with readers is an important step. "Seeing what sells high and low in comics is like seeing the future in movies."

Comic books sales have faced a challenging period

Comic book sales have experienced recent ups and downs. According to a report by Comichron, a website that tracks sales figures for comic books and graphic novels, 2017 brought a record three-month stretch in declining sales for the industry. This year has seen an increase in sales, but the best-selling comic books were in the core "Fantastic Four" and "Infinity Wars" story lines, which include several popular Marvel characters, such as Dr. Strange, and Captain Marvel. Marvel's Fantastic Four characters were created in 1961 and have had three films since 2005, making a combined total of over $786 million worldwide, according to Box Office Mojo. Last year's "Avengers: Infinity War" grossed over $2 billion. Marvel is dealing with some tensions in the market as it attempts to broaden the Marvel Cinematic Universe. The moviegoing public has shown through recent successes like "Black Panther" that it wants more diverse characters featured, but within the traditional comic book fandom there are worries about how straying too far from core characters may influence sales.

Stan Lee and Chadwick Boseman, star of Marvel Studios' Black Panther, speak onstage at the Hollywood Foreign Press Association's Grants Banquet at the Beverly Wilshire Four Seasons Hotel on August 2, 2017 in Beverly Hills, California. Kevin Winter | Getty Images Entertainment | Getty Images