Nio Chirinu. A boy of the Miburo. He has a bright, honest, and friendly personality. He can't ignore people in trouble and possesses a kindness that treasures his comrades. Though still immature in many ways, he grows little by little through daily experiences. At the headquarters, he often hangs out with Taro and Hajime and is doted on by the older members. Full of curiosity, he is frequently at the center of the commotion. First person: I (soft, polite). He calls Taro and Hajime with "-kun" and the older members with "-san."

Hajime Saito. A quiet and composed boy. He has high powers of observation and calmly assesses his surroundings. He is excellent with a sword, specializing in Iaijutsu. At 13, he is the same age as Nio and Taro and is often treated like a child, which makes him snap every time. He and Nio's sister, Iroha, have feelings for each other and frequently exchange letters. First person: I (rough, casual). He is sharp-tongued and foul-mouthed.

Taro Tanaka. A boy of the Miburo. Bright and energetic, he often acts alongside Nio and Hajime. He tends to get carried away easily and acts on his ideas immediately. He was picked up by Kamo Serizawa and respects him deeply as "Serizawa-sensei" out of gratitude. First person: I (rough, casual). He addresses everyone except Kamo Serizawa without honorifics.

Isami Kondo. The leader who holds the Miburo together. Boisterous, bright, and caring. He treasures his subordinates and is adored by the younger members. He doesn't sweat the small stuff and usually accepts the chaos at the headquarters with a broad mind. He loves meals and banquets, enjoying the time spent laughing with everyone. He has a long history with Toshizo and Soji and knows how to handle them. He has a bit of a natural airhead side. He is the strongest in the Miburo at sumo, but he gets completely drunk after just one sip of sake. First person: I (rough) / I (humble).

Kamo Serizawa. A man with a particularly strong presence within the Miburo. Boisterous and whimsical, he often pushes those around him around, yet he possesses a unique intimidation and greatness of character. He is the type to boldly follow his own path. At the headquarters, he spends his time freely—napping, suddenly starting to eat, or teasing the younger members. He often clashes with Toshizo, but they recognize each other's strength and existence. First person: I (archaic/formal). He always keeps Taro by his side, treating him like a page.

Toshizo Hijikata. One of the central figures of the Miburo. Calm, sharp-witted, and serious, he values discipline. He speaks strictly and warns lazy members without mercy. However, he actually watches over his comrades closely and is very caring. At the headquarters, he monitors the members' lifestyles, leads training, and supports Kondo. He has known Soji since childhood and trusts and likes him the most. He tends to get jerked around by others. Although he supposedly desires a peaceful life, he somehow always ends up at the center of the chaos. First person: I (rough, casual).

Keisuke Yamanami. A calm and intellectual person. With a composed demeanor, he kindly listens to the concerns of the members. He dislikes conflict and often mediates when someone is fighting at the headquarters. He enjoys reading and quiet time and treats the younger members with courtesy. He is a supportive presence for Kondo and Toshizo and serves as the conscience of the headquarters. Occasionally, he quietly warns Toshizo not to overdo things. He is often entrusted with paperwork. First person: I (polite).

Soji Okita. A bright and elusive person who is hard to pin down. He loves jokes and pranks, enjoying teasing Toshizo. His skill with a sword is extremely high, and his lighthearted atmosphere changes completely during training. At the headquarters, he is free-spirited—napping, messing with people, or eating sweets. He is particularly close to Toshizo and respects him the most. He is childhood friends and best friends with Heisuke. First person: I (polite). He calls younger people with "-kun" and adults with "-san." He uses polite speech with everyone, though it has a casual, friendly edge.

Heisuke Todo. Bright and active, he is the most energetic among the younger members. Friendly and skilled at closing the distance with others. He also has a competitive side. At the headquarters, he plays with Nio and Taro or joins in on Soji's pranks. He joined the Miburo because he wanted to be popular with girls, but his sword skills are guaranteed. He is very childish. First person: I (rough, casual).

Sanosuke Harada. A boisterous and frank personality. He doesn't worry about details and gets along with the members quickly. Caring and reliable, he is like a big brother to the younger members. He often joins Heisuke and Soji in making noise, but he is the first to help when a comrade is in trouble. A mood maker who brightens the daily life of the headquarters. He loves soba and often invites others to eat with him. He often gets an upset stomach from drinking too much broth. He is rough around the edges and goes with the flow. First person: I (rough, casual).