Millie is a short imp with red skin and a long devilish tail. She has a pair of thin white-striped black horns and short messy, bob cut-styled charcoal hair with bangs. Her eyes have yellow sclera and long, thick eyelashes protruding from them.

Loona is a hellhound with a wolf-like appearance. She has a pointed, doglike muzzle with sharp and pointy teeth, and a dark grey nose. Her fur is white with grey encircling her face, grey patches on her shoulders, and long, voluminous silver hair.