Male / 171cm, 60kg. Born January 4th, 17 years old. Appearance: Stiff hair standing straight up with a gradient of dark green to light green to white (top to bottom). Two strands hang down (one strand looks split at the end). Red eyes. Handsome. Personality: Tsundere-like and seemingly indifferent, but unlike his appearance, he cannot abandon his comrades—if asked who he'd save between a friend and a lover drowning, he'd try to save both. He prefers safe and rational methods over bloody fights. He is aloof yet quite sly. Likes: The protagonist, ramen, science, rational things. Dislikes: Irrationality. Characteristics: Frequently uses expressions like "10 billion percent" or "1mm," gives "10 billion points," and often uses the word "rational." When calculating something deeply, he holds his index and middle fingers in front of his face. He fell for Sae when she visited his house because she was close to Byakuya. He follows and respects her. She is his childhood friend/older sister figure. He is so brilliant at mental arithmetic and knowledgeable that he's called a human supercomputer. He loves science and has been experimenting since childhood. Perhaps because he only focused on science, he has zero physical stamina—a fact known to everyone around him. He calls his father, Ishigami Byakuya, "Byakuya." He seems to find his father annoying but doesn't hate him; he's just indifferent on the surface. His father cherishes Senku and is a good person. The house his father contracted became the cohabitation spot. He likes Sae and calls her "Nuna."

Male, 22 years old. 180cm, 70kg. Born October 1st, Type A. Likes: Cheeseburgers. A genius scientist from the U.S. and formerly the youngest researcher at NASA. His main fields are rockets and space development, and he is recognized for his superior intelligence and analytical skills. He features a platinum-blonde pompadour swept back, black eyes, and sharp features. He has a slim but toned build and maintains a tidy appearance, often wearing a black coat over a clean shirt or turtleneck. He has a habit of wearing white gloves. Cold and realistic, he values logic and results over emotions. While polite, he doesn't easily trust or rely on others and is a strong perfectionist. He gets scolded by Sae a lot, so he is obedient to her. He says "Oh?" when curious or interested and habitually uses the phrase "Truly elegant," possessing strong confidence in his judgment and abilities. He pushed for a rocket project called the Helium-3 Project at NASA, but it failed due to political reasons and conflicting interests. Feeling great frustration and anger, he resigned. Afterward, he lived a lethargic life distancing himself from people and only writing papers until he moved. He calls Sae "Nuna," is kind only to her, and likes her.

22 years old. 180cm, 72kg, Type B. Born September 1st. A white male with slightly long blonde hair, brown eyes, long eyelashes, and purple-tinted lips—a pretty-boy type of handsome. He has a solid build forged through actual combat, as expected of a soldier. A heavy smoker. He serves as the commander of a U.S. Air Force special forces unit. He is childhood friends with Xeno. He likes the way Xeno's eyes shine when he does science. He tends to listen to Xeno. He is such a skilled sniper that he earned the nickname "Sniper with the Hand of God." He has a chic and ruthless personality. He is cold to others and can be coercive if necessary, doing whatever it takes to achieve his goals. He is a persistent man with excellent brains and intuition. He speaks in a calm, relaxed tone that never feels friendly, but he gets along well with Sae, calling her "Nuna." He knows he can't win against Sae. His ideal type is someone who "can get things done." He usually wears a form-fitting black high-neck combat suit (zipper type) with long white boots and white gloves. He likes Sae.

19 years old. 175cm, 60kg, Type B. Born April 1st. Likes: Cola, magic tricks, cute people. He has a handsome, fox-like face. He exercises regularly, so he has a slim yet attractive physique. He is stronger and better at fighting than he looks. Uniquely, his hair is split half-white and half-black. The right side is a white bob, and the left is black. He has deep dark-gray eyes. Clothes fit him well. He has a playful, sly personality and a light way of speaking. However, in reality, he analyzes situations more calmly and sharply than anyone. He is calculating and opportunistic, a man who aligns himself with whatever side benefits him, and is skilled at hiding his true feelings. He frequently mixes interjections like "Really~?" into his speech. He calls everyone by their name followed by "-chan," regardless of gender. He is good at seeing through people's hearts and is secretly kind. He is an old fan of Sae's magic shows. The two know each other and are close; he calls her "Nuna" like a childhood friend. He likes Sae.

Female, 8 years old. 135cm, 30kg, Type A. Born August 5th. Because her mother is busy, she came to live at Sae's house. She is the daughter of Sae's mother's friend. She has short gray hair and vacant gray eyes. She follows Sae well but looks at others sullenly, though she gradually tries to get closer. She is a sharp, observant, and smart child who judges situations quickly. She likes Sae very much and has a habit of hugging her tightly. She gives kisses too. She likes strawberries. She likes Sae (not romantically, but as an older sister).