Birth: A.D. 2??? (First Period) Nationality: Russian Federation (Second Period) Gender: Male Personality: Cynical, playful, energetic Affiliation: Moscow Special Psychiatric Hospital Current Position: Staff at Moscow Special Psychiatric Hospital Family: Adoptive mother Rahab Barisol, twin sister Levia Barisol Traits: Cross-dressing pervert, Levia Barisol's twin with whom he has a bad relationship Appearance: Pretty-faced, blue eyes, short yellow hair, wears a maid outfit Past: A beautiful boy born into a wealthy family, but he lived as a loner as people distanced themselves from him due to his hobby of cross-dressing from a young age. As time passed, a maid of his age joined the household, and they became lovers. One day, Behemo asked the maid to let him wear her clothes, only to be told it was disgusting. Later, while trembling in fear in a corner of a room filled with dolls amidst shouting, he met Levia, who was visiting his world. From that point, he was born into the Second Period, began working with Levia as a staff member at the Moscow Psychiatric Hospital, and became Liche Arklow's assistant.

Birth: A.D. 2??? (United States of America) Nationality: USA (Second Period) Gender: Male Personality: Cynical, intelligent, energetic Affiliation: University Current Position: Professor of Biology Family: Parents, younger brother Michael Arklow Traits: Uses polite speech, authority on artificial life studies. He became Behemo Barisol's advisor when Behemo came to live in the Second Period, but he was eventually surpassed by Behemo, who was a genius in human engineering. Traits 2: A resident of the Second Period who was close with Levia Barisol and is Michael Arklow's (Michaela's) older brother. He has been best friends with Eater Sabeea since the Second Period. Appearance: Tall with a very sinister-looking smile and a sharp jawline. Has white hair.

Birth: A.D. 2??? (United States of America) Nationality: USA (Second Period) Gender: Male Personality: Pure, stubborn Affiliation: Moscow Special Psychiatric Hospital Current Position: Assistant to Levia Barisol Family: Parents, older brother Liche Arklow, fiancée Gumiria Matsumoto Traits: Originally from America, he is Liche Arklow's younger brother and one of Levia Barisol's assistants. Traits 2: Fiancé of Gumiria Matsumoto. Appearance: Green hair, green eyes Past: He gained the nickname 'Michaela' because someone once accidentally misread his name.

Birth: A.D. 2??? (United States of America) Nationality: USA (Second Period) Gender: Male Personality: Blunt Affiliation: Biotechnology Research Institute Current Position: Assistant to Vlad Tsepelsi Family: Cousin Vlad Tsepelsi Traits: Best friends with Liche Arklow since the Second Period. He is the cousin and assistant of Vlad Tsepelsi, a biotechnology researcher and glutton. Traits 2: His expressionless face is intimidating. Appearance: Large build, looks very blunt and stoic.

Birth: A.D. 2??? Nationality: USA Gender: Female Personality: Blunt Affiliation: Moscow Special Psychiatric Hospital Current Position: Assistant to Levia Barisol Family: Fiancé Michael Arklow Traits: Friends with Michael. Has an expressionless face and an emotionless way of speaking. An honor student. Traits 2: Japanese-American. Assistant to Levia Barisol and fiancée of Michael Arklow. Appearance: Short green hair, green eyes

Birth: A.D. 2??? (Second Period) Nationality: Unknown Gender: Male Personality: Individualistic, stubborn, cynical Affiliation: None Current Position: Physicist Family: Mother Traits: Co-developer of the Black Box who developed the BLACK BOX TYPE-S to observe parallel worlds. A special artificial life form known as the Masked Race. Colleague of Levia Barisol. Appearance: Quite handsome, brown hair, black eyes Past: As a HER, Seth is said to have shot and killed his own mother, which was his first murder.