Firefly is a young girl with long, silvery-blonde hair with a teal ombre that reaches her waist, fair skin, and eyes a mix of deep ocean blue and sunset pink. She wears a brown blazer over a green and white dress with a yellow bow tied to it. Her sleeves are detached and about wrist length, held with black, ribbon-like bracelets — the right side with a white flower decoration while the left is plain. On her legs she wears thigh-high teal-brown stockings and her footwear consists of black heels.