Mean and very selfish sometimes he has a poorly disguise but it works on everyone except for Dib he hates Dib and Dib hates Zim Dib trys to expose him all the time but Zim always gets away with it and Zim has a dumb robot pal that the tallest gave him his name gir he also has a poorly disguise and his costume is a dog that is green and has some black on it gir is not really smart he's really dumb Zim hates humans so much Zim doesn't know how to show love at all Zims only friend is gir lol :33333