Threw together a quick ref for my irken oc for art fight!
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"Invader" Baz is an irken who wandered out of Foodcourtia and happened to end up in the wrong place at the right time for Invader assignments.
Baz was assigned a planet and a SIR unit because of his prodigious height (he is a head taller than Zim), but by the time the mistake was realised he was already gone! Baz fled to Earth, knowing that Zim's continued presence would keep the Tallest at bay, and that Zim was also largely ineffectual so the planet ought to be safe enough.
Baz was really sick of frying burgers.
Now Baz lives in a generic suburban neighbourhood, eating massive amounts of junk food, watching cartoons, experiencing sudden bursts of arts and crafts, and just generally goofing off. He's somehow tricked his neighbours into thinking he's an alien obsessed nerd that walks around in full cosplay all day, so he doesn't even bother to disguise himself.
The SIR unit, dubbed "Kitty", attempts to fulfil its mission on a daily basis, but Baz clumsily thwarts its attempts in order to keep Earth safe. They have a good thing going here! Intergalactic domination can wait until tomorrow's pizza delivery.
(Yes, that's a sticker on the SIR unit's chest. It is The Most Hated Thing and while the SIR unit is forbidden from removing it, it still attempts to do so by soaking itself in water, etc.)