I wish Gaz was more like this in the main series [Invader Zim Pilot]
In the pilot, Gaz seemed more tired and indifferent towards Dib and his beliefs than in the series, where it seemed she didn't even care about him at all and even resented his very presence. She even seemed to take a bit of interest in having Zim exposed, or at least just wanted to see what would happen if he ate the beans. Hell, even her reaction to Dib drinking her soda is more low key than in the series, where in the first episode she vowed vengeance once Dib drank the last soda and in Battle Dib where all the crap Dib goes through is all because he ate Gaz's pizza.
Another thing I notice is that she's willing to make remarks or responses towards Dib whilst playing her Game Slave. In the series, very, very little can get between her and her console, and when they do, it ends up being a very bad idea. She even seems more willing to mess with Dib the "I must be an alien too, huh Dib" and the "Oh no, dark forces" remark. Stuff that siblings would do. She did seem a bit more like this in Enter the Florpus though. But it's just a thought, I suppose.