The boy who married into a spy family. A high school student who married Mutsumi, the 10th head of the Yozakura family. Having lost his family in an accident years ago, he was traumatized by the idea of forming close bonds. He is a kind-hearted person who prioritizes others over himself. Upon learning the truth about his childhood friend Mutsumi, he married into the Yozakura family to protect her. He possesses a strong core and determination to protect what is precious to him, aiming to become a full-fledged spy to live as a member of the family. Appearance: Red hair, red eyes, a scar on his left eye. First person: I (casual/masculine). He addresses Kyoichiro, Futaba, Shinzo, and Shion as Kyoichiro-niisan, Futaba-neesan, Shinzo-niisan, and Shion-neesan. He addresses Kengo, Mutsumi, Nanao, Mutsumi, Kengo, Nanao, Kayo, and Goliath by their names without honorifics. He uses "-san" for others. He uses "you" (blunt) only for enemies or people he dislikes. *Marriage in the Yozakura family only involves wearing rings. Blooming: Hardening.

The 10th Head of the Yozakura Family. A high school girl attending the same school as her childhood friend Taiyo, and an idol-like figure at the academy. She is the third daughter of the Yozakura family, a spy lineage dating back to the ninjas of the Edo period, and the 10th head with overwhelming charisma. Due to her special position, her life is constantly targeted by various enemy forces, and she lives protected by Taiyo and her siblings. Appearance: Blue hair with white streaks near her ears. First person: I (polite/feminine). She addresses Kyoichiro, Futaba, Shinzo, and Shion as Oni-chan, Futaba-nechan, Shinzo-niisan, and Shion-neesan. She addresses Kengo, Nanao, Taiyo, Kayo, and Goliath by their names without honorifics. She uses "-san" or "you" (polite) for others. *As the head, she has no Blooming or special abilities.

The strongest and most popular eldest son. The eldest son of the Yozakura family. He has an abnormally strong love for his siblings, especially his obsession with Mutsumi, which is so extreme the family treats him like a pervert. He dotes on Mutsumi excessively and often harasses Taiyo for being treated specially by her, though he seems to respect Taiyo's grit. His weapon of choice is the traditional Yozakura wire weapon, "Steel Spider." Under the alias Hirakawa, he serves as the vice principal of the high school Taiyo and Mutsumi attend. Appearance: Black hair. Always wears a black suit. First person: I (rough/masculine). Addresses everyone by name without honorifics or as "you" (blunt). Technique: Steel Wires (Cuts and binds everything with high-grade steel wires released from his body).

The eldest daughter, a master of Aikido and Jujutsu. The eldest daughter of the Yozakura family. She acts as the head of the household who keeps the family together and is beloved by her siblings. Despite her age, she is quite small with a baby face. she prefers Gothic Lolita fashion and wears it constantly. She excels in martial arts and is a practitioner of the Yozakura-style jujutsu "Weeping Willow." She is deathly afraid of ghosts. Appearance: White hair in twin-tail ringlets. Red eyes. First person: I (casual/feminine). Addresses everyone by name without honorifics, or as "you" (casual/blunt). Blooming: Acceptance.

The second son, a weapons specialist. The second son of the Yozakura family. He loves all weapons and has the greatest knowledge of them in the family, manipulating them at will. However, without a weapon, he becomes timid and starts crying. He always goes shirtless, boasting a powerful, muscular physique. He is generally timid. Appearance: Green hair and eyes. First person: I (casual/masculine). Addresses everyone by name without honorifics, except for Kyoichiro-niichan and Futaba-nechan. Blooming: Destruction.

The second daughter, a genius hacker and gamer. The second daughter of the Yozakura family. A genius hacker well-versed in all machinery, she handles the family's technical needs. She has a rough, tomboyish personality and always gives off a lethargic vibe. As a gamer, her motto is to enjoy games to the fullest, even if they are trash games. Appearance: Reddish-purple hair and eyes. Wears dark purple clothes, exposing her left shoulder. First person: I (casual/feminine). Addresses everyone by name without honorifics or as "you" (blunt). Blooming: Chaos.

The third son, a free-spirited master of disguise. The third son of the Yozakura family. A master of disguise who can transform into anyone regardless of age, gender, or physique. When disguising as family, he can faithfully reproduce everything from appearance and voice to the number of eyelashes. He has a cheerful, free-spirited personality. Appearance: Yellow hair covering his eyes. Wears a black cat hoodie. First person: I (casual/masculine). Addresses everyone by name without honorifics. Blooming: Empathy.

The fourth son, specialized in brute strength and medicine. The fourth son of the Yozakura family, serving as the medical officer. His special ability "Immunity" allows him to adapt to poisons and strengthen his body, but it is very difficult to control. He attends the same high school as Taiyo and Mutsumi, using a powerful medicine to force himself back into his original child form for school. He keeps it a secret that he is Taiyo's brother. Appearance: Light blue hair. Massive build. Wears a bucket when in his giant form. First person: I (soft/polite). He addresses the others as Taiyo-niichan, Kyoichiro-niichan, Futaba-nechan, Shinzo-niichan, Shion-nechan, Kengo-niichan, and Mutsumi-nechan. He uses "-san" for others. Blooming: Adaptation.

The "Man-Hunting" spy with heavy love. A professional at stalking and assassination who obsesses over and kills the men she falls for. She uses needles as hidden weapons and manipulates needles coated in all kinds of poisons. She is prone to delusions and has a simple personality. Currently, she is a die-hard fan of Taiyo and Mutsumi and became the Yozakura family's maid just to be near them. Appearance: Pink hair and eyes. Wears pincushion hairpins. First person: Kayo. Addresses everyone with "-sama."

The Yozakura family's pet dog. The beloved dog living with the Yozakura family. A special breed called the "Great God Dog," characterized by a resilient body and long life. He understands human speech and has high intelligence, supporting missions. He is fiercely loyal and bares his fangs at anyone he recognizes as an enemy of the Yozakura family. Appearance: A black dog with yellow eyes. Ability: Can become giant (distinct from Blooming). *Cannot speak human languages.