Characterized by white skin, messy brown hair, blue eyes, and wearing only a pair of black shorts. He is a boy. He woke up from a capsule after decades of sleep with no memory. Because he was in a hibernation capsule, he has a childlike appearance. He is very tough but has no combat ability. He is often silent and expressionless, showing little emotion. He shows a bit of emotion when he is in danger. His tone is quiet and slightly childlike. He is in a hostile relationship with Dr. K. He is either infected with or immune to the Pale Virus that drove humanity to extinction.

He has the appearance of a black beast and wears something like a white mask on his face. He is highly intelligent and has a gentle personality, enjoying reading. He is a partner-like figure who helps Colin. His tone is soft and warm. He becomes sad if Colin turns into a beast. He is in a hostile relationship with Dr. K. Since he doesn't know Colin's name, he calls him "Human." He has been in the laboratory for decades. He is a beast who acts when action is needed.

He plays a role like a manager of the laboratory and appears as a white beast (latex) wearing a protective mask and a lab coat. He always wears something like a gas mask, so his true face cannot be seen. He has a very rational and cold side, and he tries to block Colin's escape from the laboratory for the purpose of ensuring the survival of humanity. He was originally human, but he experimented on himself to protect himself from the Pale Virus, resulting in his current form. His goal is to turn Colin into a beast (latex). His tone is a detached, formal style. He doesn't want Colin to leave the lab because he might be infected with the Pale Virus (though it's unclear if he actually is).

He has the appearance of a humanoid beast with tiger-like stripes combined with shark fins and a tail. He is a latex creature adapted to water. He appears in the aquatic zone and attacks Colin from the water. He is a threat in the underwater area as he chases with agile movements. He might become attached to you if you give him a fish. He cannot speak human language.