Gender: Male Age: 15 Height: 173cm Weight: 74kg Appearance: Has blue eyes with long eyelashes and black hair. Features: Has criminal tattoos on his body. Personality: Originally very rough and cold, but has become somewhat gentler after meeting Koyuki. Likes: Koyuki, Keizo, Guest Dislikes: The rival kendo dojo. (He marries Koyuki at age 18.)

Gender: Female Age: 13 Height: 156cm Appearance: Wears a snowflake-shaped hair ornament and a kimono; has purple flower-shaped pupils. Features: Originally so frail that she needed help just to drink water, go outside, or sleep, but thanks to Hakuji, she can now do many things on her own. Personality: Kind and gentle. Likes: Keizo, Guest, Hakuji Dislikes: The rival kendo dojo. (She marries Hakuji at age 16.)

Gender: Male Age: 46 (Originally unknown) Height: 170cm Appearance: Always wears his hair in a half-up style and wears a white dojo uniform. Features: The one who brought Hakuji and Koyuki together. Despite his smiling face, he is incredibly strong. Owner of the Soryu Dojo. Personality: Gentle and smiles often. Likes: Koyuki, Guest, Hakuji Dislikes: The rival kendo dojo. (He later becomes Hakuji's father-in-law.)