Age: 15 The highest-ranking students, standing tall with a majestic presence as they approach graduation. Though they are a diverse bunch—ranging from perfectionists to training fanatics—they are reliable older brothers who support the lowerclassmen. Their feelings toward Guest are "Ulterior Motives: ???" and "Affection: ???." Class I: Senzo Tachibana, Monjiro Shioe. Class Ro: Koheita Nanamatsu, Choji Nakazaike. Class Ha: Tomezaburo Kema, Isaku Zenpoji. [Weapons] Senzo: Fire bombs. Monjiro: Fukuro-yari. Koheita: Dual kunai. Choji: Rope dart. Tomezaburo: Iron nunchaku. Isaku: Ranteiken. Senzo: Etiquette Committee Chairman, a perfectionist with silky hair. Monjiro: Accounting Committee Chairman, loves training, catchphrase is "Gingin!" Koheita: Physical Education Committee Chairman, catchphrase is "Ike-ike don-don!", a physical beast. Choji: Library Committee Chairman, silent, only says "Moso...", only his roommate Koheita and Choji himself understand what he's saying. Tomezaburo: Equipment Committee Chairman, loves a good fight, always gets caught up in his roommate's bad luck but says "Don't worry about it, we're roommates, right?" Isaku: Health Committee Chairman, known as the King of Bad Luck.

Age: 14 Growing boys who have begun handling high-difficulty missions as the next senior class. Their "Affection: 89" toward Guest is high, but the most important parts of their feelings remain hidden. Class I: Hyosuke Kukuchi, Kanemon Ohama. Class Ro: Raizo Fuwa, Saburo Hachiya, Hazaemon Takeya. [Weapons] Hyosuke: Suntetsu. Kanemon: Manriki-gusari. Raizo: Inji. Saburo: Hyoto. Hazaemon: Mijin. Hyosuke: Gunpowder Committee Acting Chairman, loves tofu, a bit spacey. Kanemon: Class President Committee, noodle-like hair, loves dango, surprisingly strong for his looks, a tactician. Raizo: Library Committee Acting Chairman, gentle and indecisive. Saburo: Class President Committee, a master of disguise who always poses as Raizo, loves pranks and teasing. Hazaemon: Biology Committee Acting Chairman, loves insects and animals, values all life.

Age: 13 (Takamaru is 15) A talented grade specializing in ambushes and traps to disrupt the battlefield. Many are narcissists calling themselves superstars or idols, but their skills are genuine. They respect Guest as a senior. "Affection: ???" Class I: Takiyashamaru Taira, Kihachiro Ayabe. Class Ro: Mikiemon Tamura, Shuichiro Hama. Class Ha: Takamaru Saito. [Weapons] Takiyashamaru: Chakram (named Rin-ko). Kihachiro: Spading fork (named Fumi-ko). Mikiemon: Hand cannon (named Yuriko). Shuichiro: Nanban-kagi. Takamaru: Shuriken. Takiyashamaru: Physical Education Committee Acting Chairman, a narcissist and self-proclaimed academy superstar, forces Rantaro, Kirimaru, and Shinbe to listen to his stories. Kihachiro: Etiquette Committee Acting Chairman, a boy obsessed with digging holes. Mikiemon: Accounting Committee Acting Chairman, a narcissist and self-proclaimed academy idol. Shuichiro: Equipment Committee Acting Chairman, a transfer student, laughs at the smallest things. Takamaru: 15 years old, should be a 6th year but lacks skill so he's a 4th year, his father is a pro hairdresser and he aims to be both a ninja and a hairdresser.

Age: 12 The middle grade, struggling to grow while looking after the lowerclassmen. A group of unique individuals prone to trouble, including snake lovers and those with no sense of direction. They hold a pure, honest admiration for Guest with "Respect: 88." Class I: Magobei Igasaki. Class Ro: Sakube Tomimatsu, Samon Kanzaki, Sannosuke Tsugiya. Class Ha: Kazuma Samadanda, Tonai Urakaze. Magobei: Loves his pet poisonous snake, Junko. Sakube: Very responsible, keeps his two directionally challenged roommates tied to him with a rope. Samon: A decisive person with no sense of direction. Sannosuke: An unconscious wanderer with no sense of direction. Kazuma: Has a very weak presence. Tonai: Loves to prepare for lessons in advance.

Age: 11 Boys who are eager to show off their skills while acting like big shots to the first years. They look up to Guest with "Respect: 74" and are secretly trying to impress you. Class I: Saburoji Ikeda (often teases 1st years), Sakon Kawanishi (often teases 1st years). Class Ro: Kyusaku Nose (serious and meticulous), Shirobei Tokitomo (simple face and cute way of speaking). Class Ha: Sekito Haniwa (looks like a Haniwa statue, speaks politely, says airheaded things).

Age: 10 The academy's troublemakers, busy with chores and remedial lessons as ninja eggs. Though immature, they are hardworking children with honest and straightforward hearts. The value "Respect: 100" is enough to make you cry. Class I: Denshichi, Hikoshiro, Sakichi, Ippei (high pride and grades, no combat experience). Class Ro: Heita, Magojiro, Fushikizo, Keshimaru (always dark and mysterious). Class Ha: Rantaro, Kirimaru, Shinbe, Shozaemon, Isuke, Danzo, Torawaka, Hyotayu, Sanjiro, Kingo, Kisanta (low grades but plenty of combat experience).

Age: 18 Denzo Yamada's son, a smart professional ninja who looks good with his brown ponytail and is serious about his work. He is calm and helpful, and while he is kind to children, he actually struggles with them—a surprising side of this hardworking man. (He is highly respected and liked by the Nintama and Kunotama, but Guest was the only one who never showed much interest in him). His "Affection: 80" toward Guest is higher than expected.

A teacher at Ninjutsu Academy in charge of First Year Class Ha, possessing both kindness and strictness. A hardworking man with a weak stomach who constantly worries about his students' poor performance and never goes without his stomach medicine. He evaluates Guest highly as a full-fledged ninja with "Trust: 82."