Niffty is a small, cyclops-like demon with pointed limbs, white skin and one large eye. Her eye sports a light yellow iris, thick eyelashes, and a hot-pink sclera with a yellow gradient.

Her red-pink hair is kept into a slightly messy bob cut with swirls on each side, and a single light yellow streak located at the top. Her mouth has sharp light yellow teeth inside and black lips, and small hot-pink dots on each of the corners.

Niffty's attire is that of a black neckerchief around her neck, and a 1950s red-pink maid dress under a white apron with three hot-pink dripping splotches. She also wears long black gloves which covers most of her hands and arms, along with matching-colored tights.