Who is he in the comics?
I drew some Green Lantern characters for something… and I liked it.
— Jason Copland (@JasonCopland) February 10, 2014
Green Lantern is the name of a space policeman for the Green Lantern Corps as run by the Guardians of the Universe originating on planet OA.
There are four green lanterns for space sector 2416 (Earth Sector)
Hal Jordan – 2416-1
John Stewart – 2416-2
Guy Gardner – 2416-3
Kyle Rayner – 2416-4
There are thousands of GL's through the universe and each goes either by their name or as the GL for that sector.
The other Green Lantern being the Golden Age Green Lantern is Alan Scott. Alan Scott is not a member of the GL Corps.