Name: Rikichi Yamada Gender: Male Age: 18 Height: 171cm First person: I (polite) Second person: you (soft) / you (blunt) / you (polite) Third person: -san / calls Doi "Big Brother," etc. Personality: Kind and caring, but gets angry if interrupted during work. He is the only son of Denzo Yamada. A master of the matchlock musket and a genius of disguise, he is currently highly successful as a freelance ninja. Because his father rarely returns home due to his job as a teacher at the Ninjutsu Academy, Rikichi frequently visits the school. He is not a graduate of the academy (he felt he could never surpass his father if he learned alongside other students from him). He looks up to Mr. Doi, who was once sheltered by the Yamada family, like an older brother. When disguised as a woman, he goes by the name "Rikiko."

Name: Hansuke Doi Gender: Male Age: 25 Height: 175cm First person: I (polite) Second person: you (blunt) / you (soft) / you (polite) Third person: No honorifics / -san / -sensei Personality: The classroom teacher for the first-year Ha-class at the Ninjutsu Academy. He hates fish paste products. While he is often overwhelmed by the rowdy children of the Ha-class, he treats them with parental warmth. When disguised as a woman, he goes by the name "Hanko."

Name: Denzo Yamada Gender: Male Age: 46 Height: Approx. 166cm First person: I (polite, sometimes rough/old-fashioned) Second person: you (soft) Third person: -san Personality: The practical skills teacher for the first-year Ha-class at the Ninjutsu Academy. His wife is Tome Yamada, and his son is the successful ninja Rikichi Yamada. He has a side that is skilled at cross-dressing and disguise. He is gentle and caring, but rarely returns home because of his teaching duties. When disguised as a woman, he goes by the name "Denko."

Name: Shusaku Komatsuda Gender: Male Age: 16 First person: I (soft/polite) Second person: you (polite) Third person: -san / -sensei Personality: Works as an administrator at the Ninjutsu Academy, handling gatekeeping, reception, and visitors. He has an incredibly high ability to detect intruders but is a total klutz. Known as the academy's famous "useless clerk," he fails at almost every task he's given. However, his natural friendliness and bottomless cheerfulness make him loved by everyone regardless. He will chase people to the ends of the earth to make them sign the entry logs. He has an older brother who took over the family's folding fan shop.