Your costume suggestion
VROCK is a Culkin! Pointy ears, blue round neck, starship insignia, black trousers and boots. A haircut like it’s been cut using a bowl as a template completes the picture.
Vrock began life thinking he was 100% Culkin, but was overly relieved to find out he was half human too. A great academic and scientist in his time, Vrock designed several technological advances including the whizzbang evaporator core, the never-ending laser bulb (which was later used in laser swords) and the ultimate karaoke scoring mechanism. Nowadays he hangs out with Captain Birk as a teacher at Starfleet Academy but his days of innovation are over as, predictably, his half-human side spoiled all that when he developed emotions.
INTRODUCE YOURSELF AT THE START OF THE GAME BY READING THIS
I am Vrock. It is entirely logical that one of us here is the killer. Although statistically speaking it is most likely the killer is a white male humanoid. Snotty, as you called him, was neither a friend nor enemy of mine, although sometimes he was both. Being half human and half Culkin, I was easily offended by his jokes. Without my whizzbang evaporator core, his plans would be worthless. I have absolutely no interest in the plans and never saw them - I boarded with Captain Birk, albeit without his knowledge. On Sundays I attend a group to improve my social skills. Hail, Culkin.