He, like all the Justice League members, are there to help solves disasters of all sorts, such as any and all evil efforts by the Legion of Doom. He seems to be extremely confident in his own powers, not having to think twice before going to slice the fear toxin trees apart with ease.
Green Lantern or John Stewart is an African-American adult male He has a musclebound physique and wears the typical Green Lantern attire with a glowing symbol of such on his chest and obviously the green power ring. He has light blue-ish eyes, short black hair with grey on the sides and black eyebrows. When using his power ring, his entire body is covered in a light green aura.