Sinbad

Sinbad is literally a puddle of man-eating nightmare fuel sludge. He decided, a few years ago, that he was very bored and even more lonely, and set about learning how to hold a human shape so he could go to university and meet people and learn things. He's doing his very best not to get caught, and, although it's tougher than he expected, Sin's doing pretty well going stealth. 

Currently attending a city college nearby his old haunt, Sin is majoring in something bio/medical-related, thanks to the knowledge he had to pick up when making a human form. His grasp on anatomy is actually pretty incredible, considering that he's able to both make and locomote an entire human person, while also maintaining some fun inner workings like lungs so he can talk.

He's pretty good at keeping a human form, but it exhausts him. If he's too tired, spooked, stressed, upset, or what have you, he's much more likely to slip up and begin melting a little. Unfortunately, on occasion, he'll also have random episodes of getting sick to his stomach and retching black stuff. That's always a fun trip to the bathroom.

Once Ross catches him, and convinces him that he doesn't need to be living in a storm drain, he settles in at Ross' apartment pretty happily. The opportunity to actually own things, have company, and be a bit looser with his human form is all very good for him and his psyche. Ross kinda spoils him a little bit, but they get along very well.

Sinbad is very excitable, but less innocent than he seems. He's fascinated by society and how much humans do all the time and finds all of it thrilling. Unfortunately, he cant completely reconcile his differences and kinda wishes that he was just human.