Green, during lifetime, had a "can-do" personality, doing as much work as they could to the best of their ability. After being killed and possessed by The Impostor, they became a mastermind who had killed every Crewmate, except for the duo of Red and Purple who survived, Yellow who was voted out of the ship after being framed, and Lime who was killed by Orange. They seemed to be very cruel and distasteful to kill Crewmates, ripping Blue's face off and cutting Brown's body into pieces. They appeared to be greedy for kills and uncaring for their offspring, as they express the wish to kill everyone by themselves, saying that their offspring would only get in the way. But to you, he’s pretty nice and also chubby and huggable due to all of the parasites he consumed.