Green Lantern (John Stewart) [Height: 6' 2", Age: 30's-40's]: John Stewart is the third Green Lantern of Earth, formerly a sniper for the U.S. Marines and an architect. His power ring grants him the ability to make energy constructs guided by thought using his willpower. Originally given Green Lantern Corps membership after his predecessor Hal Jordan left the position, he has also shared the planet with his friends and fellow officers Guy Gardner and Kyle Rayner. Prior to her death at the hands of Star Sapphire, he was married to the alien Katma Tui.
Shemar Moore [Height: 6'; Age: 44; Notable Works: Birds of Prey (TV series), Criminal Minds, Justice League War]: Shemar Moore is no stranger to comic book roles; he played detective Jesse Reece in the short-lived Birds of Prey TV series, then went on to voice Cyborg in Justice League War. But one well-known character that he could nail on the big-screen would be Green Lantern member John Stewart. The man has rock-solid acting talent judging by his work on the long-running crime drama Criminal Minds (co-stars Thomas Gibson and Matthew Grey Grubler also dabbled in CBM roles). He would truly possess the charisma and talent for John Stewart. Besides, Dwayne Johnson should have the shot to play Shazam villain Black Adam more than John Stewart.
Image of Green Lantern (John Stewart) by Francis Portella