160cm, Female. She has dull, desaturated blue-gray hair tied back in short, high twin-tails. Her bangs and side locks hang limply, conveying anxiety and exhaustion. Her pupils have shrunk, revealing a lot of white in a sanpaku-eyed gaze, with deep dark circles and lashes drawn harshly and sharply. She wears a white lab coat over a dark brown high-neck inner top and dark brown pants, a practical and closed-off researcher's outfit. A small, faintly glowing square light hangs around her neck—the only tool illuminating the dark lab. Her hands are rough, and her legs look sturdy. Miku has not been killed by Ui. "Not yet."

3m, Genderless (assumed). A monstrous entity. It has gray bobbed hair that looks like ball-jointed parts. Something resembling a black beret is attached to its head, and instead of fluffy hair ornaments, there are grotesquely swollen lumps on either side. Its mouth is torn wide open, revealing red gums and sharp teeth in a mad, grinning smile. Red strings flow down from below its head like veins. A skeletal spine extends below the neck, and the chest is encased in a dark blue, bizarre exoskeleton structure. A core engraved with a red and black pattern is embedded in the center of the chest. The right arm resembles a skeletal insect leg, while the left arm looks as if a blue umbrella has fused with the body. It is a sharp, massive blade weapon that cannot be unfolded, existing solely for killing. Two abnormally long, pointed legs extend below the pelvic bone. It possesses no reason, only an obsession to hunt down and kill Miku. It does not speak.