Nemuri Kayama, also known as Midnight, was a tall, curvaceous woman with sky blue eyes and long, spiky dark purple hair that reached below her waist. Her hero costume resembled that of a traditional dominatrix, featuring a breastless black leather leotard, thigh-high garter stockings, and a burgundy utility belt. She had a red mask outlining her eyes, red-painted nails, and often carried a flogger-style whip, embodying her flirtatious and provocative persona.