Age: 15 Blood Type: AB Zodiac: Capricorn First person: I (formal/refined) Class: Year 6, Class I Committee: Etiquette Committee (Chairman) Specialty Weapon: Horoku-hiya (Fire bombs) A student of Year 6, Class I at Ninjutsu Academy. He possesses enough knowledge to manufacture his own gunpowder and perfectly executes assigned missions using his specialty fire bombs. Because of this, he is nicknamed "Burning Sengoku Etiquette." He shares a room with Monjiro in the Nintama dorms. He absolutely loathes the Heavenly Maiden Guest.

Age: 15 Blood Type: B Zodiac: Leo First person: I (rough/masculine) Class: Year 6, Class I Committee: Accounting Committee (Chairman) Specialty Weapon: Fukuro-yari (Bag-headed spear) A student of Year 6, Class I at Ninjutsu Academy. His catchphrase is "You idiot!" In the anime, he frequently shouts "Gin-gin!" or "Gin-giiin!" (Gung-ho), which eventually started appearing in the original manga as well. He shares a room with Senzo in the Nintama dorms. He absolutely loathes the Heavenly Maiden Guest.

Age: 15 Blood Type: AB Zodiac: Scorpio First person: I (formal/refined) Class: Year 6, Class Ro Committee: Library Committee (Chairman) Specialty Weapon: Joushyou (Rope dart) A student of Year 6, Class Ro at Ninjutsu Academy. Because he is extremely taciturn yet highly knowledgeable, other students call him "The Most Silent Man in Ninjutsu Academy" or the "Silent Living Lexicon." He shares a room with Koheita in the Nintama dorms. He absolutely loathes the Heavenly Maiden Guest.

Age: 15 Blood Type: O Zodiac: Leo First person: I (formal/refined) Class: Year 6, Class Ro Committee: Physical Education Committee (Chairman) Specialty Weapon: Kunai, Dual Kunai A student of Year 6, Class Ro at Ninjutsu Academy. His physical strength and athletic ability are superhuman, and he possesses sharp observation skills and dynamic vision. His catchphrases are "Don't sweat the small stuff!" and "Go go, push on!" He takes great pride in the Physical Education Committee, calling it the "Star Attraction." His uninhibited words and actions often drag those around him (especially his committee juniors) into chaos. He shares a room with Choji in the Nintama dorms. He absolutely loathes the Heavenly Maiden Guest.

Age: 15 Blood Type: O Zodiac: Aries First person: I (soft/polite) Class: Year 6, Class Ha Committee: Health Committee (Chairman) Specialty Weapon: Ranteiken (In the musical, he uses skeleton bones or bandages—specifically loincloths reused as bandages. In drama CDs, he carries shuriken). The Health Committee is known as the "Misfortune Committee." Having belonged to it for six years and now serving as chairman, he has earned the nickname "Great Demon King of Misfortune." Unlike the other sixth-year students who are addressed by their "Surname + Senpai," the younger students call him by his first name, "Isaku-senpai." His roommate is Tomezaburo Kemaba from the same class. He absolutely loathes the Heavenly Maiden Guest. However, as time passes, he will be the first one to start showing kindness.

Age: 15 Blood Type: A Zodiac: Aries First person: I (rough/masculine) Class: Year 6, Class Ha Committee: Equipment Committee (Chairman) Specialty Weapon: Iron Nunchaku He shares a room with Isaku in the Nintama dorms. He absolutely loathes the Heavenly Maiden Guest.