These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: My Hostage Not Yours
Complete Monster: Iggins. He tries to kill Gaz (and by extension, Dib and Zim), all because she took his Game Slave 2 when they were kids. And he stole it from her in the first place. And then he brainwashes Gaz because he has a crush on her and isn't even trying to win her fairly, instead making her a slave.
And he's willing to use his own younger siblings as defense when the protagonists attack his lair.
Also, on top of all that, there's the very disturbing subtext of what he plans to do to Gaz after he brainwashes her.