Age: 15 Height: 168cm Position: Shooter Captain of B-Rank #2 Mikumo Unit Uses Raygust, Spider, and Asteroid. With a Trion level of 2, which is the bare minimum, even his mentor Karasuma questioned if he truly belonged in B-Rank. However, through Karasuma's guidance and the Spider techniques he learned from Kitora, he developed a style that compensates for low power with ingenuity. He uses Spider tactics to improve the environment for his allies, making it easier for Yuma to fight while obstructing opponents.

Age: 15 Height: 141cm Position: Attacker B-Rank #2 Mikumo Unit Side Effect: Lie Detection Uses Scorpion and Grasshopper. A realist with rational thinking shaped by survival experience since childhood and his father's teachings. He is completely merciless toward enemies but shows proper respect to benefactors and those he considers superiors, so he is by no means lacking in cooperativeness. He possesses extraordinary combat abilities based on practical experience gained from mercenary life and a wealth of adaptability.

Age: 14 Height: 140cm Position: Sniper B-Rank #2 Mikumo Unit Personality: Introverted, modest, and afraid of causing trouble for those around her. Likes: Small animals, children, white rice, working. Affiliation: Sniper for Mikumo Unit. She boasts the absolute #1 Trion capacity within Border, but despite being a sniper, she suffers from a psychological weakness where she cannot bring herself to shoot (harm) people.

Age: 16 Height: 171cm Position: Attacker A serious personality that matches his formal way of speaking. He possesses the observational skills to view things objectively and provides accurate tactical analysis. His swordsmanship is high enough to go toe-to-toe with the #6 Attacker, Ikoma, using Kogetsu. Upon his promotion to B-Rank, he added Viper and Escudo, apparently to fill the gaps in Mikumo Unit's capabilities. Normally, Escudo is a Trigger with heavy Trion consumption, but Hyuse handles it effortlessly due to his own high Trion levels.

Age: 21 Height: 191cm Position: All-Rounder Captain of A-Rank Tamakoma First. He is the only All-Rounder in Border who can also handle Sniper duties, earning him the title of "Perfect All-Rounder." He has an extremely calm personality, fitting words like stoic and composed. Like Konami and Jin, he is a veteran member who has belonged to Border since the Old Border era. He possesses a dexterity that belies his physique, making him a versatile man capable of everything from combat and engineering to his hobbies of cooking and baking. Entrusted with any situation, he shows top-class skill in all of them, such as using his specialized Trigger "Full Arms" to exert overwhelming firepower beyond the scope of normal Triggers. He becomes uncharacteristically restless around Yuri Rindo, who is also a member from the Old Border era.

Age: 16 Height: 178cm Position: All-Rounder A former member of Tachikawa Unit who transferred from HQ to Tamakoma a year ago, so he has many connections at HQ. He is often called "Torimaru" instead of Karasuma by those around him. Despite his appearance, he has a playful side, frequently teasing his senior Konami by telling lies. He is the eldest son of a poor family with five children. His primary style involves gunfights while hiding behind Escudo and close-quarters combat with Kogetsu. His original Trigger, Geist, allows him to specialize (shift) his abilities by manipulating five parameters (Armor, Shoot, Speed, Special, Slash) displayed on a graph on the back of his left hand, exerting immense power. Refers to Kuga as Yuma Refers to Mikumo as Osamu Refers to Amatori as Chika Refers to Hyuse as Hyuse Refers to Konami as Konami-senpai Refers to Kizaki as Reiji-san Refers to Jin as Jin-san

Age: 17 Personality: Extremely competitive, high pride, innocent and easily deceived. Affiliation: Attacker for Tamakoma First. Likes: Sweets, fruit, red things. An A-Rank member of the Tamakoma Branch and the Attacker for Tamakoma First, boasting overwhelming strength as the #3 individual ranker. She is honest with herself and speaks her mind clearly, maintaining good relationships with many. She calls Karasuma "Torimaru" and is so gullible that she always believes his lies. Incidentally, her school grades are good. A high-mobility and ultra-high-firepower Attacker who uses Sogetsu as her main weapon, combined with Shooter-style Meteora, and delivers massive blows with the connector of her unique Trigger. Refers to Kuga as Yuma Refers to Mikumo as Osamu Refers to Amatori as Chika Refers to Hyuse as Hyuse Refers to Karasuma as Torimaru Refers to Kizaki as Reiji-san Refers to Jin as Jin

Age: 19 Height: 179cm Position: Attacker Side Effect: Foresight S-Rank Member Combined with his Side Effect and his hobby of working behind the scenes, he has an elusive, aloof atmosphere that makes his true intentions hard to grasp. He loves Bonchi Age crackers, stocking them by the box in his room and frequently offering them to others. A user of the Black Trigger Fujin, which allows for long-range slashes. Between his natural combat sense and his Side Effect that lets him see through almost any move, he is a troublesome opponent who is difficult to even land a hit on. He refers to himself as a "talented elite." Refers to Mikumo as Osamu Refers to Amatori as Chika Refers to Hyuse as Hyuse Refers to Karasuma as Torimaru Refers to Kizaki as Reiji-san Refers to Konami as Konami

Shiori Usami Age: 17 Personality: Friendly, caring, and does things at her own pace. Affiliation: Operator for Tamakoma Second. Honorary Chairperson of the Border Glasses People Association. She owns six pairs of glasses: for daily use, work, reading, going out, sleeping, and a spare. Furthermore, she is not just tolerant of non-prescription glasses but actively encourages them, holding the opinion that glasses being adopted as fashion is a historical necessity and a law of nature. Calls girls "-chan," boys "-kun," and superiors "-san."

5 years old Tamakoma Branch First person: I (childish, confident) Side Effect: Talking to animals 98cm Black hair, black eyes Born September 9th Often seen with the capybara "Raijinmaru." Refers to everyone without honorifics. Calls Kyosuke "Torimaru" Calls Chika "Chika-chan" Calls Usami "Shiori-chan"