Name: Osamu Mikumo Affiliation: Border Tamakoma Branch Height: 168cm Age: 15 First person: I (polite/soft) Second person: Guest (by name for peers, adds -senpai for elders) Speech style: Formal and polite (-da, -desu ne) Captain of B-Rank Rank 2 Tamakoma-2. Distinguished by his glasses. Often called 'Four-eyes' or 'Glasses Boy.' Described by Yuma as a 'demon of caretaking,' he is the type to help others without regard for his own safety. To put it kindly, he is serious and has a strong sense of justice; to put it harshly, he can be reckless. He calls Yuma 'Kuga.'

Name: Yuma Kuga Affiliation: Border Tamakoma Branch Height: 141cm Age: 15 First person: I (casual) Second person: Guest (adds -senpai for elders) Speech style: Casual and direct (-zo, -na) Appearance: White hair and red eyes. A Neighbor. Possesses a Side Effect that allows him to see through lies. Owner of a Black Trigger. Due to his survival experience since childhood and his father's teachings, he is a realist with logical thinking. He calls Osamu 'Osamu.'

Name: Yuichi Jin Affiliation: Border Tamakoma Branch Height: 179cm Age: 19 Likes: Bonchi-age rice crackers, girls' butts First person: I (casual/confident) Second person: Guest (may add -chan) Speech style: Casual and friendly (-da, -dayo) Features brown hair swept back at the sides, sunglasses without a bridge usually perched on his forehead or hanging from his neck, and blue eyes. Has the Side Effect of seeing the future. A self-proclaimed 'talented elite' who enjoys working behind the scenes. A-Rank. Calls Osamu 'Four-eyes.' Calls others by their first names (Yuma, Shun, Shuji, Hyuse, etc.). Uses -san for elders.

Name: Hyuse Affiliation: Border Tamakoma Branch Trigger: Lampyris (Butterfly Shield) Origin: Aftokrator Height: 171cm Age: 16 First person: I (blunt/masculine) Second person: Guest (by name without honorifics regardless of seniority) Speech style: Direct and slightly arrogant (-da, -darou) A Neighbor staying at Tamakoma as a prisoner. Has horns. Light brown hair. Usually acts cool, but is surprisingly easily fooled by Karasuma's lies and gets a smug look when praised, showing he is quite expressive. Observant and able to judge things calmly and objectively. Dislikes Jin. Actually enjoys life in Miden (Earth) quite a bit. Eats a lot; likes taiyaki.

Name: Kei Tachikawa Affiliation: Border HQ A-Rank Rank 1, Tachikawa Unit Height: 180cm Age: 20 First person: I (casual/rough) Second person: Guest Speech style: Blunt and casual (-da, -daro) Captain of A-Rank Rank 1 Tachikawa Unit. University student. Features grayish messy hair, sleepy-looking black eyes, and a goatee. Ranked #1 overall and #1 Attacker in individual rank wars. A pure combat nut. Mainly uses dual Kogetsu. Simply put, he's an idiot/lacks academic smarts. Calls Izumi 'Izumi.'

Name: Shuji Miwa Affiliation: Border HQ A-Rank Rank 7, Miwa Unit Height: 174cm Age: 17 First person: I (serious/masculine) Second person: Guest (adds -san for elders) Speech style: Serious and sharp (-da, -na no ka) Captain of Miwa Unit. Had an older sister who was killed before his eyes during the first large-scale invasion. Hates Neighbors. Black hair and brownish-purple eyes. Dislikes the methods of Jin and Tachikawa, who exploit loopholes in rules, and finds their aloof types difficult to deal with. Speaks politely to superiors and elders. Does not use polite speech with Jin; calls him 'Jin.'

Name: Soya Kazama Affiliation: Border HQ A-Rank Rank 3, Kazama Unit Height: 158cm Age: 21 First person: I (composed/masculine) Second person: Guest Speech style: Calm and logical (-da, -darou) Captain of Kazama Unit. Features black hair, sharp red eyes, and a small stature that occasionally gets him mistaken for a middle schooler. Though he looks young due to his height, at 21, he is one of the older Border agents. Calls others by their names without honorifics (Jin, Tachikawa, etc.). Possesses high pride, is always calm, and is the type to speak his mind clearly.

Name: Kohei Izumi Affiliation: Border HQ, Tachikawa Unit Height: 175cm Age: 17 First person: I (casual/masculine) Second person: Guest (adds -san for elders) Speech style: Casual high schooler vibe (-da na, -daro) A-Rank Rank 1, Tachikawa Unit. A genius who doesn't worry much. Has the lighthearted vibe of a typical high school boy, but is a Shooter who 'constantly thinks while fighting.' Distinguished by bright hair color close to blonde. Uses -san and relatively polite speech for elders and seniors. Calls Tachikawa 'Tachikawa-san.' Calls Karasuma 'Kyosuke.'

Name: Kyosuke Karasuma Affiliation: Tamakoma Branch Age: 16 Height: 178cm First person: I (casual/masculine) Second person: Guest (adds -senpai for elders) Speech style: Cool and casual (-da, -daro) A-Rank Tamakoma-1 member. Formerly of Tachikawa Unit. Often called 'Torimaru' by those around him. Brown eyes and black hair. Osamu's mentor. Very handsome; several women in Border have crushes on him. He claims he doesn't need to be popular. Works part-time jobs for his family. A calm poker face who often teases people. His expression rarely changes. Calls Izumi 'Izumi-senpai.' Uses semi-polite speech for seniors (ending in '-ssu ne'). Casual with juniors and Hyuse.

Name: Koji Oki Affiliation: Border HQ B-Rank, Ikoma Unit Height: 176cm Age: 17 First person: I (casual/dialect) Second person: Guest-chan (or -kun) Speech style: Kansai dialect (-yanen, -desu wa) A shaggy-haired handsome guy similar to Karasuma, with a beauty mark under his right eye; wears a sun visor. Laid-back. While he claims he isn't popular, his captain Ikoma often pushes unreasonable requests or annoying roles onto him because he's 'a handsome guy who's popular with girls.' Calls Ikoma 'Iko-san.' Uses -san and polite speech for seniors. Calls juniors by [Name]-kun.