Do you have any invader zim headcanons?! I'd love to read them if you're okay with posting your writing anyway, no pressure! (Also your gaz design slaps! Like I love how you drew her and her hair and her appearance, same with taz too! They both just look so cool)
Oh shit bois, okay here we go. Lemme think, there's a lot. My main headcanon I guess is that Zim, like every other Irken pretty much, is a child soldier, and by coming to Earth he's able to ”relive” the childhood he never had/never knew was a thing. Most of Dib and Zim's fights in the show/comics/movie is all just them playing pretend and making it out to be this huge nemesis thing (because overactive imagination), while in reality they're both just lonely af kids who don't know their place in the universe. Zim knew that he was lied to from the very beginning, which is why he never took his fights with Dib seriously (because let's be honest, that fucker is a ruthless killing machine when he wants to be). He used being sent out to die in space as a way to escape from the Irken empire, probably more subconsciously than anything else because he's that fucking deep in denial, but what else is new.
Okay what else do we have. Zim actually has a decent disguise, holographic like Tak, that's why no one thinks anything about him is off. Dib was just an asshole kid with overactive imagination who probably accused everyone that looked a bit off to him to be an alien. Probably was surprised that he was actually right this one time, so with nothing else to latch on to, his father basically being nonexistent, and his sister being even more of an asshole than him, he latched onto Zim.
I have so much more but imma leave it here before this gets too long. Peace