vriska, terezi, and eridan had very intimidating and/or abrasive denizens, which were designed for them to easily want to kill. it’s literally 88 i mean bait to play on their aggression.
alternatively eridan just killed whatever he saw so he didnt NEED a nasty denizen, it would be so funny if it had like a tiny flower on its head
and terezi’s denizen was secretly a fucking unhatched egg. she was so pissed off, but as usual didnt tell anyone and pretended she murdered a flashy monster. RIP
following this same pattern there’s a chance cetus is actually a very nice and sweet denizen and vriska was just kind of bitter about her mommy issues
just moving along like everyone else 