Here is some info about the Green Lantern:
Real Name: Kyle Rayner
Occupation: Freelance Artist
Base of Operations: New York City
Group Affiliation: Justice League of America
Past Group Affiliation: New Titans
After Hal Jordan went mad, killing most of the Green Lanterns and Guardians of the Universe, the last surviving Guardian formed a new Green Lantern ring and went to Earth in search of a replacement. Appearing in an alley and finding two men, one of whom was a drunken bum, he chose to give it to the other, a struggling artist named Kyle Rayner.
Kyle became the new Green Lantern, fought Hal as Parallax, and went on to join first the New Titans and then the Justice League. When he first met the Flash, they were immediately hostile toward each other. Wally thought Kyle was an amateur, and Kyle thought Wally was arrogant. As Kyle developed his skills, and Wally realized he actually had skills, the animosity faded, and after working together in the JLA they’ve actually become friends—but they remain extremely competitive.
Kyle’s ring differs from the standard Green Lantern rings in that it is not vulnerable to yellow, and it needs to be recharged based on how much energy it uses instead of just every 24 hours.
There is even a Green Lantern Homer!