Greenie have no body. In fact, he mostly get around with his friend. Sometime, he would lose his voice , so there would be a text, like a game. Greenie don't do much, but he would go everywhere he want and he could teleport.
He have friend like him, the other place just look at him sometime. He can flow or fly so no one can do anything about him. Greenie can't die cause how he look and have no body, also his friend.