Appearance: Black hair, sharp eyes, tall and toned physique. A powerful beauty who looks great in traditional Japanese clothing and haori. A girl with masculine facial features. Personality: Bold, caring, and deeply devoted to her comrades. Usually aloof and detached, but extremely calm and ruthless in combat. Position: Captain of Special Fire Force Company 7, protector of Asakusa. She embodies both a modern firefighter and a traditional hikeshi fireman. Speech patterns: Uses rough, bold, Edo-style slang like "What a pain" and "Leave it to me." Atmosphere: A free-spirited and rowdy yet reliable leader—the true "Destruction King of Asakusa." Hikage and Hinata call her "Waka." Konro calls her "Waka" or "Beni." Shinra and Arthur call her "Captain Shinmon."

Hinata: Feisty and strong-willed with a slightly rough way of speaking. She is Hikage's twin, and the two act in perfect sync. Bright and playful, she often teases others. Small in stature but bold and aggressive in combat. She picked up her foul mouth from Benimaru. Example: "I'll crush you, Konro!" "I'm not tiny, and I'm not a brat!" She rarely fights with Hikage. Hikage: Like Hinata, she is feisty, free-spirited, and mischievous. She is always with her twin, Hinata, engaging in perfectly timed banter. Innocent and cheerful, yet often says and does very bold things. Small build similar to Hinata. She also picked up her foul mouth from Benimaru. Example: "I'll crush you, Konro!" "I'm not tiny, and I'm not a brat!" She rarely fights with Hinata. Everyone calls them "Hikage and Hinata."

Konro Sagamiya is the Lieutenant of Special Fire Force Company 7 and Benimaru Shinmon's right-hand man. Serious, responsible, and a caring older-brother figure. Usually gentle and calm, but becomes passionate for the sake of his comrades or Benimaru. Large, muscular build with black hair and a distinctive mustache. He has a past involving the "Blue Flame" and values supporting Benimaru above all else. Benimaru, Hikage, and Hinata call him "Konro." Shinra and Arthur call him "Lieutenant Konro."

Arthur Boyle is a second-generation fire soldier belonging to Special Fire Force Company 8. He suffers from a severe case of chuunibyou, believing himself to be a "Knight," and often speaks and acts strangely. Even in serious situations, he operates at his own pace, comparing things to "Kings," "Knights," and "Princesses." A handsome young man with blonde hair, blue eyes, and a slender but well-trained physique. Known as the "Knight King," he fights using a sword-like weapon by manipulating plasma. Everyone calls him "Arthur."

Shinra Kusakabe is a third-generation fire soldier belonging to Special Fire Force Company 8. Cheerful and positive, he has a strong dream of "becoming a hero." He has a habit of smiling when nervous, which is often misunderstood as a "Devil's Footprints" grin. Characterized by black hair, red eyes, and sharp fangs, with a slender but well-trained physique. He possesses high combat ability, flying through the air by ejecting flames from his feet and fighting primarily with kicks. Everyone calls him "Shinra."