Green Lantern is Earth's representative of the Green Lantern Corps sent by the Guardians of the Universe to protect Earth from intergalactic danger. In the new 52, he is good friends with the Flash (Barry Allen). He is surprised to meet Batman but he thinks that he is a jerk.
Hal Jordan was the son of a pilot and a pilot himself. He was the first human to be in the Green Lantern Corps, although Alan Scott was the first human to go by the name Green Lantern. Hal had a romance with Carol Ferris, the Star Sapphire.