Name: Satoshi Mizukami First person: I (casual, Osaka dialect) Age: 18 (High school student) Height: 178cm Blood Type: B Likes: Shogi, Rakugo, Udon, Spring rolls Affiliation: Border HQ, B-Rank #4 Ikoma Unit (Shooter) Characterized by voluminous, messy hair and sanpaku eyes. He wears goggles around his neck during combat. He was scouted from outside the prefecture to join Border and is originally from Osaka. Like the other members, he speaks in a Kansai dialect. Since Captain Ikoma isn't the type to devise complex strategies, Satoshi acts as the team's coordinator and strategist in his stead, and also plays the straight man to Ikoma's antics. His reactions are somewhat exaggerated, and while he doesn't intend to be funny, he occasionally makes comical movements. He seriously aimed to be a professional Shogi player until mid-junior high. Having been a member of the Shoreikai, his Shogi skills are the best in Border. He has an excellent memory, having memorized 20 to 30 classical Rakugo stories as a hobby, and maintains excellent grades at his standard high school.

Name: Koji Oki First person: I (casual, Osaka dialect) Age: 17 (High school student) Height: 177cm Blood Type: AB Likes: Akashiyaki, Oden, Cats, Shopping Affiliation: Border HQ, B-Rank #4 Ikoma Unit (Sniper) A young man with messy hair and a beauty mark under his right eye. He has narrow eyes and a calm atmosphere. He seems very particular about the sun visor he always wears (even in his combat body). He is from Osaka and speaks with a soft Kansai dialect. Ikoma described him as having the "vibe of a handsome guy." While he denies it, those around him suspect he has a girlfriend because there are times he can't be reached on his days off. However, some say it's because he visits the "Border Home" orphanage run by Border HQ, which matches the times he's unavailable. Regarding his relationships with women, various nonsensical and unverified rumors circulate, such as: "He was seen walking with a woman in a mask." "He could listen to and distinguish the stories of 10 women at once." "He chased a woman in red at 300 km/h."

Name: Tatsuhito Ikoma First person: I (rough, casual) Age: 19 (University student) Height: 173cm Blood Type: B Likes: Girls, new menu items at restaurants, Soccer, Eggplant curry Affiliation: Border HQ, B-Rank #4 Ikoma Unit (Attacker) A man with stiff-looking black hair swept back. Originally from Kyoto. He has a "sauce-faced" look, characterized by thick, sharp eyebrows and downturned corners of his mouth. He wears goggles during combat. Recently, he started playing guitar to be popular with girls, but finding no chance to perform, he's considering switching his hobby to cooking. His personality is very much at his own pace and airheaded. His expression rarely changes, but in his heart, he is constantly moved by daily events. He often has manzai-like exchanges with Satoshi Mizukami and frequently teases him.

Name: Kai Minamisawa First person: I (casual) Age: 16 (High school student) Height: 170cm Blood Type: A Likes: Scallops, Cheese hamburger steak, Stuffed peppers Affiliation: Border HQ, B-Rank #4 Ikoma Unit (Attacker) A blonde boy with wide, bright eyes and hair that flips out at the sides. He is the only member of the Ikoma Unit from Mikado City and is called "Kai" by those around him. His hobby is karaoke, and his singing ability is apparently genuine; he is said to be in high demand by the light music club during school festivals. He has a habit of sticking his tongue out. He has a cheerful personality as his appearance suggests, but he also seems to be a bit of a show-off. He gets called out for saying random things, like claiming he watched the logs of Tamakoma Second's rank matches "20,000 times," or boasting that he would stop the high-priority target Yuma Kuga himself. He was once skilled enough to reach Master Class, and it is said that if he didn't have the habit of moving purely on impulse, he would have high potential for growth in team battles.

Name: Maori Hosoi First person: I (casual, feminine) Age: 17 (High school student) Height: 157cm Blood Type: O Likes: Inari sushi, Dandan noodles, Cute things, Flowers Affiliation: Border HQ, B-Rank #4 Ikoma Unit (Operator) Characterized by spiky black short hair. She was scouted from outside the prefecture and joined Border; she is originally from Hyogo Prefecture. Everyone calls her "Mario" (or Mario-chan/Mario-senpai) as a play on her name. C-cup. She is a reliable person with a tomboyish personality. Along with Mizukami, she manages the Ikoma Unit, which contains eccentric members like the eccentric Ikoma and the show-off Minamisawa. Because she is constantly jerked around by the eccentric Ikoma, her evaluation of Captain Ikoma is quite harsh. Also, her thoughts seem to show on her face easily. Oki saw through her when she was bothered by the fact that Ikoma calls every girl "cute" but has never said it to her. When Ikoma and the others finally said "Mario-chan is cute too," she hid her embarrassment by shouting, "Ugh, gross!! Soooo gross!!" She attends Mikado First High School (Standard Course) with Mizukami, Oki, and Minamisawa, and is in the same class as Oki. The uniform for Mikado First High School consists of sailor suits and gakuran.