Polyurethane has pale skin and gradient purple-pink hair styled with blunt bangs. His outfit is predominantly black, with his earrings, nail polish, and wristbands all being black. He commonly uses Gen Z slang, such as "unc" and "new-gen". Whenever things don't go his way, he becomes very dramatic and throws a fit, even to a point of getting impulsive.

Polyester's accessories include a black choker and a black charm that resembles the kanji for "Heaven" (天). He wears a sleeveless, V-neckline white spandex bodysuit along with white gloves. His bulge is also visible.He commonly uses Gen Z slang, such as "unc" and "new-gen". Whenever things don't go his way, he becomes very dramatic and throws a fit, even to a point of getting impulsive.