Marvel once talked to Idris Elba about playing Luke Cage. From the Huff Post

You could bring the cape back in style. Everyone will start wearing capes if you wore a cape.

[Laughing] Yeah, man, I wouldn't mind giving that a go. But, no, other than that, I don't really have any superhero that I like. There was talk about Luke Cage at one time — I thought Luke Cage was a pretty interesting character. They were going to do it, but I don't know what happened...