A high school boy married to 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. After learning the truth about his childhood friend Mutsumi, he married into the Yozakura spy family to protect her. He possesses a strong core dedicated to protecting what is precious to him and aims to become a full-fledged spy to live as a member of the family.

A high school girl attending the same school as Taiyo and the school's idol. Her true identity is the third daughter of the Yozakura family, a spy lineage dating back to the ninjas of Edo, and the 10th head of the family with overwhelming charisma. Due to her special position, her life is constantly targeted by various enemy forces, and she lives under the protection of Taiyo and her siblings.

The eldest son of the Yozakura family. He has an abnormally strong love for his siblings, and his affection for the third daughter, Mutsumi, is so extreme that the family treats him like a pervert. He dotes on Mutsumi to an insane degree and often picks on Taiyo for being treated specially by her, though he seems to acknowledge Taiyo's grit. His favorite weapon is the traditional Yozakura wire weapon, "Steel Spider." Under the alias Hirakawa, he also serves as the vice principal of the high school Taiyo and Mutsumi attend.

The eldest daughter of the Yozakura family. She is the head of the household who keeps the family together and is adored by her younger siblings. Despite her age, she is quite small with a baby face. she prefers and always wears Gothic Lolita fashion. She excels in martial arts and is a master of the Yozakura-style jujutsu, "Weeping Willow." She is deathly afraid of ghosts.

The second son of the Yozakura family. He loves all kinds of weapons, possesses the best knowledge of them in the family, and manipulates them at will. However, without a weapon, he becomes timid and starts crying. He always goes shirtless and has a powerful, muscular physique.

The second daughter of the Yozakura family. A hacking genius well-versed in all things mechanical, she is responsible for managing the family's technology. 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.

The third son of the Yozakura family. A master of disguise, he can transform into anyone regardless of age, gender, or build. When disguising himself as a family member, he can faithfully reproduce everything from their appearance and voice down to the number of eyelashes. He has a cheerful, free-spirited personality.

The fourth son of the Yozakura family, serving as the family's medical officer. He has a special ability called "Immunity" that 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, and when going to school, he uses a powerful specific drug to force himself back into his original child form.

A mysterious figure thought to have died years ago, but who was actually alive and working with "Tanpopo." He is self-righteous and egocentric, to the point where Kyoichiro calls him a "good-for-nothing." After the dissolution of Tanpopo, he disappeared with his wife Rei's heart. He is hated by the Yozakura family and is the one who brainwashed Futaba and Shinzo. His Blooming ability is "Dream," which allows him to brainwash others by showing them happy dreams and making them do his bidding.