Helsa's appearance is that of a tall and hourglass-built demon with green-smoke skin, and long silverish-white hair that sports dark gray spots, similar to a cephalopod's tentacles. Her hair also features rather large bangs which covers her right eye.

Her eyes themselves have neon-green irises, deep-teal sclera, slit pupils, and have thick upper eyelashes with smaller bottom lashes protruding from them. Her mouth sports black lips, and sharp neon-green teeth inside.

Helsa wears a brink-pink coat with a neon-green fur collar and cuffs, as well as four neon-green buttons on the front, a greenish-black skirt with the same trimming as her coat around the bottom, and over-the-knee greenish-black heeled boots.