I hope y'all can forgive the mildly juvenile, but still culturally relevant diversion: I had stopped regularly reading comic books by the time that John Stewart's Green Lantern appeared. But in a lot of ways I think he is the most refreshingly universal black science-fiction superhero. In most of sci-fi, whiteness is framed as universal, and blackness is framed as provincial and local. The advanced being from the next galaxy over is generally the authoritative-sounding white man with silly putty on his face. Most black characters, on the other hand, will sound and act as if they were from 125th and Lennox Ave (give or take a light year).
In contrast to the more "ghetto-centric" blaxploitation era superheroes like Black Lighting (and variations like Black Vulcan, Soul Power, Static and Juice) or Power Man, and even in contrast to the more Afrocentric heroes like Storm or Black Panther, John Stewart is on a whole other level. (A few others in the same ballpark, which come to mind from the world outside of comic books are Mace Windu and Benjamin Sisko).
Wikipedia: Green Lantern (John Stewart)
Book of Oa: The Unofficial John Stewart Biography
Wikipedia: List of Black Superheroes
Wikipedia: History of Black Superheroes
Wikipedia: African characters in comics
race and dc comics
black comic books
birth of a nation: a comic novel
"'x-men' is not a cleverly named documentary about the nation of islam..."
on the serious tip...
afrofuturism/rebirth of a nation