Riko is a short young girl with a plain face and green eyes. She has long blonde hair typically styled into pigtails, whether loose or braided. Her attire while delving in the Abyss includes a standard delver's jacket and helmet, a rock-climbing harness over a backless leotard, gloves, and purple stockings.

Reg appears like a young boy with light brown skin, dark hair, and small gray eyebrows. His eyes are yellow with catlike vertically slit pupils. His ears are slightly pointed, and he has two red patches of skin on his cheeks with four more on either side of his ribcage. the only parts of him that appear mechanical are his limbs, which are notably bulky compared to the rest of his body. He wears a metal helmet with two asymmetrical horns protruding from the sides. Underneath his helmet is a jagged metal headband of some sort, with bolts on either side keeping it in place on his head. the tattered red cape he wears attached to a metal collar. His baggy green-and-purple pants end just below the knee.

Nanachi appears very rabbit-like, save for a long, sturdy tail, horizontally slanted pupils, They also have cream-white human hair worn straight in a short bob, with shoulder-length side bangs; in contrast, medium tan fur covers the rest of their body, with light tan covering the insides of their ears and belly. They have a blush-like spot on each cheek, with two thick whiskers protruding sideways. They also have yellow eyes and a cat-like mouth. Their fingers are rather stubby, though surprisingly agile, as they are very artistically skilled. Attire consists solely of gray-green drop-crotch harem pants with dark-pink hip bags on both sides, red pant legs.

Faputa has dark skin, large yellow eyes, and long feathery white hair. She has large rabbit-like ears and fluffy white fur covering her forearms and lower body, starting at her hips, with five tails fanning out behind her. One of her most notable features is her four arms; each has three large red claws acting as fingers and two other claws folded away.

Ozen is a very tall and rather slim woman, speculated to stand at over 2 meters in height. She has a strangely shaped monochrome hairstyle. Her eyes are pitch black and lusterless, giving her an unsettling and disturbing gaze. When fully equipped for delving, she wears bulky armor and a disc-shaped hat that conceals her eyes. Her White Whistle is adorned with a pair of horns, giving it a bovine appearance. Despite being a White Whistle for over 50 years, she appears deceivingly youthful, with only her white hair showing her age. Coldness dominates her personality. She can often be cruel, cynical, and apathetic.