Some background is in order here. See, there isn't just the Green Lantern, there are thousands of Green Lanterns, who make up the Green Lantern Corps. And there aren't just Green Lanterns, there are also Red Lanterns, Blue Lanterns, Orange Lanterns, etc. And they all represent a different emotion. Green is will power. Red, of course, is rage. And one of the Red Lanterns is a kitty:
Good kitty.