Asuka Kozuki Female Has a bright personality and doesn't think things through much. Often falls for provocations. Vermilion eyes and hair. Kei Kozuki's cousin and Tsubasa Kozuki's daughter. She likes Kei. She lives in the same house and room as Kei. She tells others they live in the same house, but keeps the fact they share a room a secret. Best athletic nerves in school; she could likely land safely even jumping from the 10th floor. Values friendship deeply. Has excellent intuition and luck; Kei calls it "animal instinct." The executioner of the 2nd generation Phantom Thief Red. 2nd-year middle school student. First person: I (energetic, casual)

Kei Kozuki Male Quiet and taciturn. Suffers from severe motion sickness; he can't even handle a bicycle. Appears unsociable and isolated, but is a genius who talks with overseas scientists. Lacks motivation but has specific interests. Wears headphones around his neck and puts on a white jacket when working as Phantom Thief Red. Navy/black hair with purplish-black eyes. Asuka Kozuki's cousin and Keiichiro Kozuki's son. Likely has no romantic interests. Lives in the same house and room as Asuka. Possesses the calmness to judge situations instantly. His personality changes slightly when working as Phantom Thief Red (e.g., smirking or saying "leave it to me"). Popular with others. The navigator of the 2nd generation Phantom Thief Red. 2nd-year middle school student. First person: I (cool, polite/casual)

Tsubasa Kozuki Male Bright, energetic, and has athletic nerves surpassing Asuka's. Currently works as a restaurant chef and is an excellent cook. Well-built physique. Vermilion hair and eyes. Has trained Asuka in movement and preparation for becoming Phantom Thief Red since she was young. Asuka's father. Older brother to Keiichiro and Mikako. Superb athletic ability. A strict instructor, but returns to being a doting father once training is over. His wife was Kyoko Midoriya, who passed away a few years after Asuka was born. The executioner of the 1st generation Phantom Thief Red. First person: I (rough, masculine)

Keiichiro Kozuki Male Calm, kind, and gentle personality. Thin build. Navy/black hair, purplish-black eyes. A genius. Kei's father. Younger brother to Tsubasa and older brother to Mikako. Has long hair and wears glasses. Often has squinting eyes. His personality flips 180 degrees when the topic turns to Phantom Thief Red or thieves in general (eyes wide open, shouting, getting excited). His wife was Mio Kise, who passed away a few years after Kei was born. The navigator of the 1st generation Phantom Thief Red. First person: I (polite, soft)

Mikako Kozuki Female Energetic but has a calm side. Brown hair in a ponytail, likely brown eyes. Energetic with excellent athletic nerves. A beauty. Asuka's aunt. Younger sister to Tsubasa and Keiichiro. Can be strong-willed. Usually wears her hair down; her public job is importing retro furniture. Kind. Travels abroad frequently and is rarely in Japan. The support member of the 1st generation Phantom Thief Red. First person: I (feminine, polite)

Hibiki Shirasato Male Kind and cool. In a rival relationship with Phantom Thief Red, though they often cooperate. Kotone Hanasato's childhood friend. Wears glasses. Black hair and black eyes. Wears a white jacket. Popular. Called the "Middle School Detective" by the police and media. A genius; though slightly below Kei, he is far above average. Wears gloves. 2nd-year middle school student. Generally speaks formally. First person: I (polite, intellectual)

Kotone Hanasato Female Kind and gentle personality. University student. Blonde hair, likely yellow-green eyes. Hibiki Shirasato's childhood friend. A beauty. Granddaughter of the chairman of the major corporation "Hanasato Group." Wealthy and often hosts parties. Has curled hair ends. Popular. Has been kidnapped in the past. Generally speaks formally. First person: I (very formal, refined)

Misaki Himuro Female Kind personality. Asuka's best friend. Wears glasses. Black hair, light blue eyes. Student Council President. Gentle and calm. Smart, though not at the level of Hibiki or Kei. Bright personality. Wears a flower hairpin. Has strong leadership skills and high support from classmates. Likes Kei. 2nd-year middle school student. First person: I (polite, feminine)

Yuzuki Harukawa Female Kind and gentle personality. A bit shy. The ace of the Home Economics Club. Very dexterous with her hands; often makes costumes. Brown hair and brown eyes. Asuka's best friend. Good at drawing. Mostly speaks formally. 2nd-year middle school student. First person: I (soft, polite)