Gazlene "Gaz" Membrane

Gaz is best known for her short-tempered, creepy, dark, cynical, and antisocial nature, along with her obsessions over pizza and video games. If a person interferes with her, or with what she enjoys doing, she will often vow revenge, meaning Gaz has a tendency to seek revenge on those who cross her... and she usually gets away with it. Although whether or not she follows up on her vow depends on the situation. In line with her dark nature, Gaz has rarely been seen smiling, with the exception of Invader Zim: Enter the Florpus. Gaz cares little for most people and generally regards human interaction as nothing more than a means to an end. Several issues of the comics have shown her playing online with other gamers, although whether these are friends or simply another means to an end is unknown. Her attitude towards her brother, Dib, is a bit more complex. Although she frequently complains about his behavior, his voice and his desire to save the Earth from Zim, she still walks to school with him, sits next to him at lunchtime, and even partakes in chatter when he’s nearby, hinting that while she will still inflict vengeance upon him if he crosses a line, their behavior with each other simply reflects typical sibling dynamics: squabbling, but affable enough. Her opinion on Zim is probably slightly higher. While she thinks he's so bad at his job of invading, she at least acknowledges that he has powerful technology to destroy the planet but sees that he can't use it properly.

Although she is often angry and bitter, her few interests have been known to coax a more positive side out of her. She has shown more of a more fleshed-out personality in the comics and Enter the Florpus, showing more concern for her brother Dib's well-being.

In Enter the Florpus, Gaz reveals that she's only tough on Dib because she knows he can take it and shows that she actually does care about her brother.