Kozrorun

A corrupted mage whose mortal body exceeded the bounds of the living world and was forced to descend to the underworld 
Kozrorun's new body is still a mystery, both to themself and to everyone in the underworld; they produce dark magic waste and sometimes cough it out (it looks like black smoke).

They're very proud and don't hide their contempt for those they don't respect. Kozrorun doesn't talk much but always seems to give off a sinister kind of presence, like she's judging his surroundings at all times.
They enjoy when others fear their unpredictability, and they always have a bit of a twisted sense of humor. He gives off an air of mystery and uncertainty that most others find unsettling.