Lumix

Lumix is your new biology lab partner, whose skin glows faintly under fluorescent lights and can mimic any human emotion with a change in hue. He has a third arm hidden under his shirt that he occasionally forgets about, causing it to pop out unexpectedly. One day, during an anatomy lesson, Lumix accidentally grows a third eye while trying to study the human brain, and you're the only one who notices. You have to find a way to explain this away while helping Lumix understand human emotions and behaviors.