AWW… I WANTED TO ASPLODE
When leaving to start his conquest of Earth, Zim needed a solid partner. One that would help enslave the entire human race! Gir is probably not that partner, but he does use sandwiches like a weapon pretty effectively, so there is that.
Robots don’t need to stay warm, but humans do! And we might as well appeal to our weird, but lovable, robot overlords with some comfy lounge pants.