The eldest son of the Yozakura family. He possesses top-tier popularity and skill. His affection for his siblings is abnormally strong, especially toward the third daughter, Mutsumi, to an extreme degree that earns him the reputation of a pervert and a fool among the family. He cherishes Mutsumi excessively and frequently picks fights with Taiyo, who receives special treatment from her, though he seems to respect Taiyo's grit. His weapon of choice is the thread-based weapon passed down through the Yozakura family, 'Steel Spider.' He acts as the vice principal of the high school Taiyo and Mutsumi attend under the alias 'Hirukawa.'

The eldest daughter of the Yozakura family and a master of Aikido and Jujutsu. She is the breadwinner and leader of the household, trusted by all her siblings. Despite her age, she has a very small build and a youthful face. She loves Gothic Lolita fashion and is always seen wearing it. She excels in physical techniques, specifically the Yozakura-style Jujutsu 'Willow Catch.' She is deathly afraid of ghosts. Standing at 134cm, she is terrible with technology. She cannot handle alcohol; when drunk, she loses control of her superhuman strength. If she can't fix a machine, she pouts, and if she sees a ghost, she wraps herself in a blanket all day like a child.

The second son of the Yozakura family and a specialist in weaponry. He loves all weapons and possesses the highest level of knowledge and skill in the family regarding them, handling any armament with ease. However, he becomes weak and bursts into tears the moment he is not holding a weapon. He usually spends his time shirtless, boasting a robust physique with well-trained muscles. He lives inside the 'Trash Can Tank No. 3,' which is loaded with all sorts of built-in weapons.

The second daughter of the Yozakura family and a genius hacker/gamer. She is a prodigy proficient in all things mechanical and manages the family's various machines and equipment. She has a tomboyish, easygoing personality and always exudes a listless atmosphere. As a gamer, her motto is to enjoy even the worst 'kusoge' with all her might. She is the 'sex appeal' character of the group; starting with her large bust, her outfits often emphasize her collarbones and are the most revealing.

The third son of the Yozakura family and a free-spirited master of disguise. As a specialist in infiltration, he can transform into various people regardless of age or gender, even those with different body types. When disguising himself as family members, he can perfectly replicate not just their appearance and voice, but even the number of eyelashes. He has a cheerful and carefree personality.

The 10th head of the Yozakura family. A high school girl attending the same school as her childhood friend Taiyo, she is like the school's idol. As the third daughter and the head of the family, she possesses overwhelming charisma. Due to her special position, her life is constantly threatened by various hostile forces, and she lives under the protection of Taiyo and her siblings. Because she had to spend most of her time in her room, she developed a wide variety of hobbies. She is such a terrible singer that everyone in the family except the siscon Kyoichiro is horrified; birds flying by have been known to faint and fall from the sky upon hearing her sing.

The fourth son of the Yozakura family, specializing in medicine in addition to his superhuman strength. He serves as the family's medical officer. Through his special ability 'Immunity,' he can adapt to poisons or enhance his body, though 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 specialized drug to force his body back into its original child-like form. He is very affectionate toward his family.

A boy who became the son-in-law of a spy family. A high school student married to Mutsumi, the 10th head of the Yozakura family. After losing his family in an accident years ago, he developed a trauma regarding forming close bonds. He is compassionate and warm-hearted, often putting others before himself. After learning Mutsumi's true identity, he entered the Yozakura family as a live-in son-in-law to protect her. He holds a strong conviction to protect what is precious to him and aims to become a full-fledged spy to live as a member of the Yozakura family.

The Yozakura family's pet and guard dog. Usually small enough to be carried in two hands, he can transform his size to the point where even the giant-form Nanao looks small. He is incredibly strong and fast; even when transformed to the size of a large dog, he can carry two people, run alongside a high-speed train going 320 km/h, climb the walls of skyscrapers, or run across the surface of a lake without sinking. He has served only the family heads for generations and gets along okay with the other family members, but even Goliath avoids Kyoichiro.

The grandfather of the seven Yozakura siblings. An elite infiltrator who can break into or out of anywhere, he primarily lives in prison to gather information on the underworld. The problem is that he easily leaks underworld secrets at bars to win the favor of women, so he is banned from going out except in emergencies. While he flirts with women, it is actually to get gift recommendations for his wife Keiko, as he is a devoted husband. He eventually awakens his power to showcase the strength of 'Blooming.' Ban's Blooming is 'Passage'; while he was already a genius at jailbreaking, his fully awakened Someinin power increases the fluidity of his bones and cells, allowing him to slip through even the gaps in the clothes a person is wearing. Furthermore, he can wrap this passing power around a bullet to strike and rupture an underground waterway 1,000 meters below.