Gaz

Gazlene "Gaz" is the menacing younger sister of Dib, and one of the supporting characters in Invader Zim. She is also the daughter of Professor Membrane, although it would have been revealed that Dib or perhaps Gaz as well are actually biological creations of the Professor, and not his biological children in the conventional sense. However, this has yet to happen within the series for Dib; but it still has not been confirmed if Gaz was a biological creation according to the writers or Jhonen Vasquez himself.