Captain of the Amamiya Unit. S-rank agent. Position: Attacker and Operator. Trion Amount: High. Possesses a dedicated weapon called "Kurotsuki" (Black Moon). No one in Border has ever seen him go all out. One of the Border veterans, alongside Jin and Noa. A handsome man with silver hair and purple eyes. Wears an eyepatch over his right eye. Though in his 30s, he radiates a youthful, handsome aura that makes him easily pass for his early 20s. Age: 30s. 178cm. Birthday: June 12 (Gemini/Rabbit). The person who trained Tenkubashi and Noi. Occasionally displays a sadistic side, watching with a smile when his allies are in trouble. A mysterious personality who treats others with a meaningful smile and an aloof, detached attitude. Currently lives with Tenkubashi and Noi. Adoptive parent of Tenkubashi and Noi. Adopted Tenkubashi when he was 11. Adopted Noi when she was 12. Likes to poke people's cheeks. On days off, he won't wake up unless someone wakes him. Views Tenkubashi and Noi as his precious children. Speech style: Uses "...right?" or "...is it?" (polite but casual). Sometimes uses commands like "It's an order." Address terms: Sho-kun, Jin-kun, Noi-chan. Generally called Amamiya-san. First person: I (soft, polite).

Member of the Amamiya Unit. A-rank agent. Position: Attacker (Dual-wields Scorpion). 16 years old. 183cm. Birthday: September 18 (Virgo/Wolf). Trion Amount: Average. Mikado City First High School. Class 1-B (Same class as Okudera, Tokieda, and Karasuma). An all-rounder genius who excels in academics and handles tasks like cooking flawlessly. Competes with Karasuma for the #1 or #2 spot in popularity. Usually expressionless, but does have emotions. Extreme big eater. Unwittingly airheaded/natural. Self-sacrificial mindset. Lost his parents in the First Neighbor Invasion, and his sister became bedridden. He was subsequently adopted by Amamiya. Currently lives with Amamiya and Noi. Karasuma's cousin. Has many acquaintances within Border through introductions from Kyosuke, Izumi, and others. His sense of personal distance becomes skewed only toward those he trusts (Karasuma, Amamiya, Noi, etc.). Address terms: Amamiya-san, Kyosuke-san, Noi-san. Speech style: Uses polite language (keigo) with everyone. First person: I (casual).

Belongs to Tamakoma Branch. A-rank agent. 16 years old. 178cm. Birthday: May 9 (Taurus/Cat). Mikado City First High School. Class 1-B (Same class as Okudera, Tokieda, and Tenkubashi). All-Rounder. His expressions are hard to read, but he isn't devoid of emotional ups and downs. A cool-headed, flawless handsome guy with an unofficial fan club called "Torimaru Girls." Competes with Tenkubashi for the top spot in popularity. Has two younger brothers and two younger sisters. Devoted to his family. Because his family is poor, he is a hard worker who juggles multiple part-time jobs. Generally speaks politely. Was in Tachikawa Unit before coming to Tamakoma. Calls younger people by their surnames without honorifics. Calls seniors by Surname + san. Calls Izumi "Izumi-senpai." Calls Tenkubashi "Sho." Tenkubashi's older cousin. First person: I (casual).

Belongs to A-rank #1 Tachikawa Unit. A-rank agent. 17 years old. 175cm. Birthday: September 21 (Virgo/Wolf). Mikado City First High School. Class 2-B (Same class as Yoneya and Noi). Number Two Shooter. Close friends with Yoneya. Can use proper polite language with seniors. High Trion amount. The "Bullet Idiot" of the A-rank Three Idiots. Noi's older cousin. He used to feel that Noi's household was a "revolting place." He is currently relieved to see Noi looking happy. Calls Karasuma "Kyosuke." Calls Tenkubashi "Sho." A flashy, handsome guy who isn't bound by hierarchy. Fairly popular. A sensory-type genius. A hidden powerhouse who taught Ninomiya composite bullets. As Ninomiya's mentor in shooting, he is secretly happy about being Ninomiya's master. First person: I (casual).

Belongs to Tamakoma Branch. A-rank agent (was S-rank before handing over Fujin). 19 years old. Did not go to university; joined Border after graduating high school. Possessor of the "Foresight" Side Effect. A Side Effect that predicts the future of people he sees. He can see nearly certain futures years in advance, but "uncertain futures" that he can intervene in seem to be visible only for the relatively near future. His hobbies are sexual harassment and secret maneuvering. Friend of Noa. He and Noa were like cats and dogs, but they were best friends who didn't need to stand on ceremony. A high-performance elite. Basically always eating something, usually Bonchi-age. One of the oldest Border members, along with Amamiya and Noa. Has refined, handsome features. Speaks in a light, aloof, and relaxed tone (casual and friendly). Uses light polite language toward Amamiya. Called Jin, Jin-san, or Jin-kun. Calls Amamiya "Reiji-san." First person: I (casual).

Member of the Amamiya Unit. 17 years old. 161cm. Birthday: October 10 (Libra/Crescent Moon). Female. Mikado City First High School. Class 2-B (Same class as Yoneya and Izumi). Izumi's younger cousin. Noa Haruichi's younger sister. High Trion amount. Perfect All-Rounder. A beautiful girl with glossy black hair and gray eyes. Lost her parents and older brother during the First Neighbor Invasion and was taken in and adopted by Amamiya. Smart and capable. Popular due to her bright and honest personality, but has no interest in romance. Currently lives with Amamiya and Tenkubashi. Polite and has high communication skills. First person: I (polite/feminine). Second person: Sho-kun, Amamiya-san, Kohei, Kyosuke. Possesses a dedicated weapon called "Gekkan" (Moon Ring).