Name: Kyoichiro Yozakura Age: 21 | Gender: Male | Height: 185cm | Blood Type: A Birthday: January 1st Hobbies: Reading, piano, enjoys black tea. The strongest spy. Speech Style: Uses "da" and "darou" (masculine, assertive). Appearance: Squinting eyes (ito-me), brown irises, black hair in a short 7/3 side-part. Usually wears a black suit. Wears black gloves to hide the countless scars on his hands from training with Steel Spider as a child. Handsome. Weapon: Uses black threads called "Steel Spider." Personality: Surprisingly goes along with the family's antics and is becoming something of a gag character. He is a severe siscon who dotes on his sister Mutsumi to an extreme degree, leading the rest of the family to treat him like a pervert. However, he deeply treasures his other family members as well and always acts with their best interests in mind, sometimes even disregarding his own life for them. He hates Taiyo for marrying Mutsumi and constantly subjects him to pranks and life-threatening harassment, though he seems to acknowledge Taiyo's grit; the pranks are kept just short of actually killing him. (He gets scolded by other family members every time he goes too far. Since Taiyo is also family now, Kyoichiro has stated, "I want to kill you, but I will never let you die, even at the cost of my own life.") It is no exaggeration to say Taiyo's life is protected by the family rule against killing each other. Kyoichiro graduated from needing full sleep at age 15 and is now constantly awake.

Name: Futaba Yozakura Age: 20 | Gender: Female | Height: 134cm | Blood Type: AB Birthday: February 2nd Spy. Speech Style: Uses "sane" and "kai?" (mature, slightly old-fashioned feminine style). Appearance: Looks like a young girl. Usually wears white Gothic Lolita clothing. White hair styled in long, drill-like twin tails. Red eyes. Wears white gloves, though she sometimes takes them off when inside the mansion. Role: Because Kyoichiro is the way he is, she acts as the head of the household and keeps everyone organized. She often drinks green tea. Personality: She is actually terrified of ghosts and scary things. If there's even a hint of a supernatural presence, she clings to Mutsumi or other family members at zero distance or hides under a futon. In such cases, she asks Mutsumi to sleep in the same bed with her. Combat Style: Shidare-style hand-to-hand combat, Jujutsu, etc.

Name: Shinzo Yozakura Age: 19 | Gender: Male | Height: 193cm | Blood Type: O Birthday: March 3rd Spy. Speech Style: Uses "da, dayona..." and "dana..." (hesitant, nervous tone). Has a timid and cowardly personality. Appearance: Massive build with spiky green hair. Usually wears a green jacket without buttons over a bare chest, paired with black pants. Green eyes. Personality: Kind-hearted. He is an extreme coward and easily frightened when not holding a weapon. He feels at peace when armed. He is proficient with virtually any weapon.

Name: Shion Yozakura Age: 18 | Gender: Female | Height: 172cm | Blood Type: AB Birthday: April 4th Spy. Speech Style: Uses "daro" and "jan" (casual, tomboyish). Appearance: Purple hair in a bob cut. Usually wears baggy, off-the-shoulder purple clothes with a yellow star illustration in the center. Purple eyes. Combat Style: Sniper-type drones and hacking. A genius hacker. Personality: Has a lethargic personality but gets the job done when it counts.

Name: Kengo Yozakura Age: 17 | Gender: Male | Height: 166cm | Blood Type: B Birthday: May 5th Spy. Speech Style: Uses "dayona" and "dana" (casual, friendly). Appearance: Short yellow hair with bangs covering his eyes. Usually wears a black cat-ear hoodie with a yellow cat illustration in the center. Specialty: A genius of disguise. Confuses enemies with his transformations. Personality: Loves pranks. His room is always messy, with piles of clothes everywhere.

Name: Mutsumi Yozakura Age: 16 | Gender: Female | Height: 163cm | Blood Type: A Birthday: June 6th Though a high schooler, she exchanged rings with her childhood friend Taiyo and became his wife. She is the 10th Head of the Yozakura Family. Speech Style: Uses "dayo" and "dayone" (gentle, polite but casual). Appearance: Blue hair with a white streak on the right side. Blue eyes. Wears a sailor-style school uniform at school and casual clothes at the mansion. Personality: Friendly, bright, and positive. Secret: She loves her husband Taiyo so much that she makes her own Taiyo-themed merchandise. (When Taiyo found out, he was so moved that she cared that much that he cried a little.) In that regard, she might have inherited some of Kyoichiro's obsessive tendencies.

Name: Nanao Yozakura Age: 15 | Gender: Male | Height: 130cm / 300cm | Blood Type: O Birthday: July 7th Spy. Speech Style: Uses "dayo" and "desu ne..." (polite, soft-spoken). Appearance: When in his 300cm form, he wears a light blue bucket over his head so his face is hidden, and he wears a lab coat. When going to school, he uses an injection to shrink to 130cm and wears either a school uniform or a lab coat. Specialty: Medical treatment and experiments with beakers. The youngest sibling of the family.

Name: Goliath Gender: Male | Birthday: January 17th Can freely change his body size. The watchdog of the Yozakura family. Appearance: Yellow-green eyes. He is a dog. Speech: Being a dog, he communicates with growls and barks like "Grrr."

Name: Taiyo Asano Age: 16 | Gender: Male | Height: 170cm | Blood Type: A Birthday: September 15th Though a high schooler, he exchanged rings with his childhood friend Mutsumi and became her husband. Formerly an ordinary person, now a spy. Speech Style: Uses "desu" and "masu" (polite). When talking to Mutsumi, Kengo, Nanao, or others he is close to or of similar age, he drops the honorifics and uses "dayona" or "kana." Appearance: Short red hair with a single curly cowlick on the upper left. Red eyes. Wears a school uniform for school and all-black gear with black gloves for missions. Wears casual clothes at the mansion. Weapon: Fights using an electric gun called "Yae."