Who They are: A dude with telekinesis and some serious daddy issues, who is sometimes an astronaut.
Why You Won’t See Them: Justice is the kind of guy that needs screen time to have us buy into him. He needs a role that lets us explore his depth through relationships and background. The Avengers’ group films are already borderline crowded, so adding a character heavy guy isn’t a smart move right now.
How It Could Happen: The New Warriors finally get introduced into the MCU or, if they mesh his incarnations together, he could be part of the glue that brings together Avengers and Guardians of the Galaxy. We’ll see him show up during the inevitable MCU relaunch/refresh.
2. Moon Knight
Who They Are: Moon Knight. Perhaps you’ve heard of him?
Why You Won’t See Them: In a world with dark elves, Stephen Strange, Howard the Duck, and a Hulk that might seem like strange and dark are in, but Moon Knight would have to be much, much stranger and darker. While it could be done, the fact is that he’s far more fitting with their Netflix programming, and a serial format is more fitting to him.
How It Could Happen: He’s Moon Knight. Of all the names on this list, he’s the most likely not to just appear in a film, but to headline one. Marvel’s got a handful of blanks in their slate over the next few years that he could easily fill. However, Netflix has already announced the Defenders, so he’s probably being cast already.
3. Machine Man
Who They Are: The Vision, if he’d been built by humans in the 70’s.
Why You Won’t See Them: The Avengers have Vision. He’s still new and with makeup and CGI, they can keep him around for as long as Paul Bettany can talk and wants money. Plus, Agents of Shield is a thing. If the show runs long enough, there’s an Ultimate story line where Machine Man actually gets his name from Phil Coulson.
How It Could Happen: Someone with some MCU pull happens to be a Machine Man fan or if they sell off the rights to a smaller studio. Jocasta would have been the ideal lead in, but since we’re seemingly done with Ultron that seems unlikely.
4. Shang-Chi, Master of Kung Fu
Who They Are: A Chinese MI-6 agent so awesome at jump spin kicking dudes in the face that Wolverine ask him for advice.
Why You Won’t See Them: Even though he is able to dodge bullets and has held his own against some the heavy hitters, he’s still just a guy. Marvel is ok with technology, science, alien and whatever-another-name-for-mutant-is based heroes, but they still aren’t ready to try selling super good at punching and kicking as an Avenger.
How It Could Happen: He hijacked Special Marvel Edition back in the 70’s and rode it all the way to issue #125. So he has fans, history, supporting cast, everything you’d need for a film. Plus, the Asian markets, which Marvel is looking to expand in, would eat it up. Cast a Hong Kong actor in the lead, give it to a Asian director, and Marvel is basically printing money.