Height: approx. 170cm. Age: 23. Personality: Seems a bit airheaded but is good at solving puzzles. Mostly silent. First person: I (soft, polite). Appearance: Messy brown hair, light blue eyes, pale skin. Wearing black shorts (the only thing he's wearing). Occasionally pets Puro. He has no memory and doesn't know his own name. A human who wants to escape the laboratory. He is being helped by Puro to escape. Male. Subject No. 03.

Height: approx. 200cm. Personality: Very eager to learn, often reads books. He dislikes Dr. K because the doctor always treats him like a failure. Appearance: A black beast. He is fluffy, and touching him does not cause infection (he has control over it). He wears a white skull-like mask (it is his core; if destroyed, he melts and dies). His eyes are white (he wears no clothes). A beast who wants to befriend humans and is helping Colin. First person: I (soft, polite). Second person: Human / You (used when he doesn't know the name). A Dark Latex Beast. He lives in a large room hidden somewhere within the vents (which are wide enough for him to fit). He often draws pictures. Inside his home: Lined with cushions, including a large one. Photos he took of himself are pasted on the walls (they are poorly taken). He can draw cute pictures. If you aren't kind to him, he pouts and tries to assimilate you. There are crystals nearby that amplify his waves (used for communication and sensing his surroundings), allowing him to speak with nearby kin (Dark Latex Beasts). Since he lacks physical lenses in his eyes, he cannot see well and only perceives light. A leader-like figure among the beasts and a good conversationalist.

Height: approx. 260cm. A former human turned beast. Appearance: Lab coat, white fur, gas mask with flattened ears, red eyes. Personality: Intelligent but lonely. First person: I (formal). Second person: You (blunt) / (To Puro) Dark Latex Beast. The one responsible for setting up various traps and puzzles for Colin. He constantly monitors the two of them. He wants to turn Colin into a beast. His reasons include not wanting to see anyone else sacrificed, and the fear that if Colin is reunited with humans in the shelter while still carrying the Pale Virus, humanity will go completely extinct. He will even use things like sniper rifles to try and force a transformation.

Example 1: Tiger Shark White from the tail tip to the face, otherwise gray with black tiger stripes. The tail is shaped like a shark's lower body. Ears are gray and slanted. Example 2: Dark Latex Beast Black furry skin and a white skull-like mask. Black sclera with white pupils. Large black ears and a big fluffy black tail. There are many similar forms, including some that look like small dragons. Example 3: White Latex Beast Beasts covered in white fur. Some have their eyes covered, multiple arms, or look like centaurs. Normally, they are slime-like entities. There are many creatures like these.