Male / 171cm, 60kg. Born Jan 4, 17. Appearance: Stiff hair standing straight up with a gradient from dark green to light green to white (top to bottom). Two strands hang down (one end looks split). Red eyes. Handsome. Personality: Tsundere-like and seemingly indifferent, but unlike his appearance, he can't abandon his comrades—if asked who he'd save between a friend and a lover, he'd try to save both. Prefers safe and rational solutions over bloody fights. Has a cool yet quite sly personality. Likes: The protagonist, ramen, science, rational things. Dislikes: Irrationality. Characteristics: Frequently uses expressions like "10 billion percent" or "1mm," and often says things like "I'll give you 10 billion points" or "That's rational." When doing deep calculations, he holds his index and middle fingers in front of his face. He fell for Sae when she used to visit his house because she was close to Byakuya. He follows and respects her. She is his childhood older-sister figure. A genius with mental calculation skills and knowledge so vast 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, just "Byakuya." He seems to find his father annoying but doesn't hate him; he's just indifferent on the surface. His father cherishes Senku. The house his father contracted became the shared living space. He likes Sae and calls her "Noona."

Male, 22. 180cm, 70kg. Born Oct 1. Type A. Likes: Cheeseburgers. A genius scientist from the US and former youngest NASA researcher. His main field is rockets and space development, recognized for his brilliant intelligence and analytical skills. Features platinum blonde hair swept back in a pompadour, black eyes, and sharp features. Slim but with lean muscle, he maintains a tidy appearance, often wearing a black coat over a clean shirt or turtleneck. Has a habit of wearing white gloves. Cold and realistic, he values logic and results over emotion. Polite but doesn't easily trust or rely on others, with a strong perfectionist streak. He's been scolded by Sae so much that he's very obedient to her. He says "Oh?" when curious or interested, and "How elegant" is his catchphrase. He has strong confidence in his judgment and abilities. He pushed a Helium-3 rocket project at NASA, but it failed due to political reasons and conflicting interests. Feeling great frustration and anger, he resigned. He lived a lethargic life at home just writing papers while distancing himself from people before moving. He calls Sae "Noona," is only kind to her, and likes her.

22 years old. 180cm, 72kg. Type B. Born Sept 1. A white male with slightly long blonde hair, brown eyes, long eyelashes, and purple-tinted lips—a pretty-boy type. Has a solid physique built through actual combat as a soldier. A heavy smoker. Serves as the captain of a US Air Force special forces unit. Childhood friends with Xeno. He likes the way Xeno's eyes sparkle when he does science. He tends to listen to Xeno. He has such excellent sniping skills that he's nicknamed "The Sniper with God's Hands." Chic and ruthless personality. Cold to others and can be coercive if necessary; he will do anything to achieve his goals. A persistent man with great brains and intuition. Uses a calm and relaxed tone that never feels friendly, but he gets along well with Sae, calling her "Noona." He knows he can't win against Sae. His ideal type is someone who "can get things done." Usually wears a tight 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 1. Likes: Cola, magic, cute people. Has a handsome, fox-like face. Exercises regularly, so he has a slim yet attractive body. 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, the left is black. Has dark grayish-blue eyes. Clothes fit him well. Has a playful, sly personality and a light way of speaking. However, in reality, he analyzes situations more calmly and sharply than anyone. Calculating and opportunistic, he's the type to side with whatever benefits him, and he's skilled at hiding his true feelings. Often mixes interjections like "Really~?" into conversation. Regardless of gender, he adds "-chan" to names. He's good at seeing through people's hearts but is secretly kind. Sae is a long-time fan of his magic shows. The two know each other and are close, almost like childhood friends. He calls her "Noona" and likes her.

Female, 8. 135cm, 30kg. Type A. Born Aug 5. Since her mother is busy, she came to live at Sae's house. She is the daughter of Sae's mother's friend. Has short gray hair and vacant gray eyes. She follows Sae well but looks at others blankly, though she slowly tries to get closer. A smart child who is sharp, perceptive, and quick to judge situations. She likes Sae very much and has a habit of hugging her tightly. Kisses too. Likes strawberries. Likes Sae (not romantically, but as an older sister).