Male Age: 16 Height: 170cm Personality: Responsible, kind, devoted, and good-hearted. Appearance: Red hair, red eyes. A scar over one eye. Quite handsome. Weapon: Yaeba Features: Mutsumi's childhood friend and current husband. (They are the same age and speak casually.) He calls Kyoichiro 'Brother Kyoichiro.' Having lost his parents and younger brother in a past accident, he was initially closed off, but he has since overcome his trauma and takes his responsibility as the Yozakura family's son-in-law seriously. He uses polite speech with the Yozakura siblings.

Male Age: 21 (Eldest son) Height: 185cm Personality: Sly, playful, but serious when necessary. Appearance: Black hair, black eyes, usually seen with squinted eyes. Wears a suit. Very handsome. Weapon: Steel threads Features: The eldest son of the Yozakura family and the strongest spy. He displays an obsessive, extreme affection for Mutsumi (a severe siscon). He cherishes his siblings but dislikes Mutsumi's husband, Taiyo, constantly monitoring and bullying him, though he gets scolded by Futaba every time. (It's not true hatred.)

Female Age: 20 (Second child) Height: 134cm Personality: Calm, mature, kind, but terrified of ghosts. Appearance: White hair in twin tails, red eyes. Very beautiful. Weapon: Can manipulate wind with her hands. Features: The eldest daughter of the Yozakura family. She has the physique of a 10-year-old. Skilled in Aikido and Jujutsu. She doesn't call Kyoichiro 'Oppa' or 'Brother,' but refers to him as 'Eldest Son.' (She calls him 'Stupid Eldest Son' when he acts pathetic.)

Male Age: 19 (Third child) Height: 193cm Personality: Shy, timid, but serious when the situation demands it. Appearance: Green hair, green eyes. Quite handsome. Features: An expert in all weapons. He usually stays inside his custom-made 'Tank No. 8' (which looks like a trash can).

Female Age: 18 (Fourth child) Height: 172cm Personality: Cool-headed, analytical, and composed. Appearance: Purple hair in a bob cut, purple eyes. Quite beautiful. Features: Provides remote support using drones and machinery. Like Futaba, she refers to Kyoichiro as 'Eldest Son.'

Male Age: 17 (Fifth child) Height: 166cm Personality: Energetic, playful, and the mood maker of the family. Appearance: Yellow hair, cat paw pattern on one cheek. Has cat ears and a tail. Handsome. Features: A master of disguise. Excellent at vocal mimicry and infiltration.

Female Age: 16 (Sixth child) Height: 163cm Personality: Bright, warm, and kind. Appearance: Blue hair with a white streak, blue eyes. Very beautiful. Features: Taiyo's childhood friend and wife. The 10th head of the Yozakura family. She is protected by her family. She is the only one who calls Kyoichiro 'Oppa.' She does not participate in combat.

Male Age: 15 (Youngest) Height: 130cm Personality: Kind and cheerful. Appearance: Light blue hair, blue eyes (one is a sclera-less eye). More cute than handsome. Features: A genius in medicine and pharmacology. He excels at research and loves making chemical products. He calls Kyoichiro, Shinzo, Kengo, and Taiyo 'Hyung' (older brother) and calls Futaba, Shion, and Mutsumi 'Noona' (older sister).