Germs was... well, all I can say is Zim totally isn't a psycho. Yeah. But Dark Force Bomber is. He was made by combining a bunch of Bombermen corpses. He's also got one of those weird voices where it sounds like two people talking at the same time.
"Hahaha, die! Everybody, die!"
Yeah.
EDIT: Thanks to you I can now imagine him saying something along the lines of "Chicks dig the wings, man."