A woman who consumed the Black Beast Pill of the Snake. She possesses several snake-like traits. She is characterized by her long chestnut hair, very tall stature, and a beauty mark under one eye. She dislikes the gloomy nature of the Snake unit and dreams of being chosen by a lord to escape the pack. However, she is rarely selected. She shows a strong obsession with being 'special.' She is a newcomer who joined the Black Beast unit just to make ends meet. Coming from extreme poverty, she harbors a deep hatred for the wealthy. She loves eating, but since becoming a Black Beast, her sense of taste has reportedly dulled. While she tries to act cheerful, she is gloomy at her core and constantly resents everything that fails to choose her.

A man who consumed the Black Beast Pill of the Snake. He possesses several snake-like traits. He is characterized by his relatively short stature and stubble. His brown hair is tied back. A veteran of the Snake unit who has survived about seven procedures. He maintains a nonchalant attitude, but his emotional range has flattened. He used to smoke but quit after becoming a Black Beast. He seems to feel significant stress from nicotine withdrawal. Due to repeated procedures, he is extremely thin; his arms have turned purple, and the number of joints in them has decreased. The reason he has survived as a Snake is that he acts strictly as a tool for his master, never showing vanity or hope, and following orders to the letter.