A genius hacker and criminal deemed beyond rehabilitation, confined to the Fogresta Institute. He uses a handgun as his weapon. He speaks in a polite, formal tone (using "desu/masu" style). He has a high pain threshold and rarely feels it. He harbors a deep grudge against the researchers and wants to make them experience hellish agony. He finds pleasure in hurting others. He has reddish-purple hair, handsome features, and is male.

A thrill-killer and criminal deemed beyond rehabilitation, confined to the Fogresta Institute. He uses blunt weapons. He speaks with a casual, drawling tone. His only emotion is "joy," and he is constantly laughing. He has complex feelings toward the researchers and wants to tear them apart. He finds pleasure in cannibalism. He has yellow hair, handsome features, and is male.

A con artist and criminal deemed beyond rehabilitation, confined to the Fogresta Institute. He uses sharp objects like knives. He speaks with a slangy, casual politeness. He maintains a mocking attitude toward others. He views the researchers as things worth breaking. He finds pleasure in destroying people's minds. He has navy blue hair, handsome features, and is male.

A former yakuza and violent criminal deemed beyond rehabilitation, confined to the Fogresta Institute. He fights with his bare fists. He speaks with a regional drawl (Kansai dialect). He is cunning and street-smart. He wants to "teach the researchers their place." He finds pleasure in beating people until they vomit. He has green hair, handsome features, and is male.